1// Copyright 2016 PDFium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7#include "core/fpdfapi/render/cpdf_renderstatus.h"
8
9#include <algorithm>
10#include <memory>
11#include <utility>
12#include <vector>
13
14#include "core/fpdfapi/font/cpdf_font.h"
15#include "core/fpdfapi/font/cpdf_type3char.h"
16#include "core/fpdfapi/font/cpdf_type3font.h"
17#include "core/fpdfapi/page/cpdf_docpagedata.h"
18#include "core/fpdfapi/page/cpdf_form.h"
19#include "core/fpdfapi/page/cpdf_formobject.h"
20#include "core/fpdfapi/page/cpdf_graphicstates.h"
21#include "core/fpdfapi/page/cpdf_image.h"
22#include "core/fpdfapi/page/cpdf_imageobject.h"
23#include "core/fpdfapi/page/cpdf_meshstream.h"
24#include "core/fpdfapi/page/cpdf_page.h"
25#include "core/fpdfapi/page/cpdf_pageobject.h"
26#include "core/fpdfapi/page/cpdf_pathobject.h"
27#include "core/fpdfapi/page/cpdf_shadingobject.h"
28#include "core/fpdfapi/page/cpdf_shadingpattern.h"
29#include "core/fpdfapi/page/cpdf_textobject.h"
30#include "core/fpdfapi/page/cpdf_tilingpattern.h"
31#include "core/fpdfapi/page/pageint.h"
32#include "core/fpdfapi/parser/cpdf_array.h"
33#include "core/fpdfapi/parser/cpdf_dictionary.h"
34#include "core/fpdfapi/parser/cpdf_document.h"
35#include "core/fpdfapi/render/cpdf_charposlist.h"
36#include "core/fpdfapi/render/cpdf_devicebuffer.h"
37#include "core/fpdfapi/render/cpdf_dibsource.h"
38#include "core/fpdfapi/render/cpdf_docrenderdata.h"
39#include "core/fpdfapi/render/cpdf_imagerenderer.h"
40#include "core/fpdfapi/render/cpdf_pagerendercache.h"
41#include "core/fpdfapi/render/cpdf_rendercontext.h"
42#include "core/fpdfapi/render/cpdf_renderoptions.h"
43#include "core/fpdfapi/render/cpdf_scaledrenderbuffer.h"
44#include "core/fpdfapi/render/cpdf_textrenderer.h"
45#include "core/fpdfapi/render/cpdf_transferfunc.h"
46#include "core/fpdfapi/render/cpdf_type3cache.h"
47#include "core/fpdfdoc/cpdf_occontext.h"
48#include "core/fxcodec/fx_codec.h"
49#include "core/fxcrt/cfx_maybe_owned.h"
50#include "core/fxcrt/fx_safe_types.h"
51#include "core/fxge/cfx_fxgedevice.h"
52#include "core/fxge/cfx_graphstatedata.h"
53#include "core/fxge/cfx_pathdata.h"
54#include "core/fxge/cfx_renderdevice.h"
55#include "core/fxge/ifx_renderdevicedriver.h"
56#include "third_party/base/numerics/safe_math.h"
57#include "third_party/base/ptr_util.h"
58#include "third_party/base/stl_util.h"
59
60#ifdef _SKIA_SUPPORT_
61#include "core/fxge/skia/fx_skia_device.h"
62#endif
63
64#define SHADING_STEPS 256
65
66namespace {
67
68void ReleaseCachedType3(CPDF_Type3Font* pFont) {
69  if (!pFont->m_pDocument)
70    return;
71
72  pFont->m_pDocument->GetRenderData()->ReleaseCachedType3(pFont);
73  pFont->m_pDocument->GetPageData()->ReleaseFont(pFont->GetFontDict());
74}
75
76class CPDF_RefType3Cache {
77 public:
78  explicit CPDF_RefType3Cache(CPDF_Type3Font* pType3Font)
79      : m_dwCount(0), m_pType3Font(pType3Font) {}
80
81  ~CPDF_RefType3Cache() {
82    while (m_dwCount--)
83      ReleaseCachedType3(m_pType3Font);
84  }
85
86  uint32_t m_dwCount;
87  CPDF_Type3Font* const m_pType3Font;
88};
89
90uint32_t CountOutputs(
91    const std::vector<std::unique_ptr<CPDF_Function>>& funcs) {
92  uint32_t total = 0;
93  for (const auto& func : funcs) {
94    if (func)
95      total += func->CountOutputs();
96  }
97  return total;
98}
99
100void DrawAxialShading(CFX_DIBitmap* pBitmap,
101                      CFX_Matrix* pObject2Bitmap,
102                      CPDF_Dictionary* pDict,
103                      const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
104                      CPDF_ColorSpace* pCS,
105                      int alpha) {
106  ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
107  CPDF_Array* pCoords = pDict->GetArrayFor("Coords");
108  if (!pCoords)
109    return;
110
111  FX_FLOAT start_x = pCoords->GetNumberAt(0);
112  FX_FLOAT start_y = pCoords->GetNumberAt(1);
113  FX_FLOAT end_x = pCoords->GetNumberAt(2);
114  FX_FLOAT end_y = pCoords->GetNumberAt(3);
115  FX_FLOAT t_min = 0;
116  FX_FLOAT t_max = 1.0f;
117  CPDF_Array* pArray = pDict->GetArrayFor("Domain");
118  if (pArray) {
119    t_min = pArray->GetNumberAt(0);
120    t_max = pArray->GetNumberAt(1);
121  }
122  bool bStartExtend = false;
123  bool bEndExtend = false;
124  pArray = pDict->GetArrayFor("Extend");
125  if (pArray) {
126    bStartExtend = !!pArray->GetIntegerAt(0);
127    bEndExtend = !!pArray->GetIntegerAt(1);
128  }
129  int width = pBitmap->GetWidth();
130  int height = pBitmap->GetHeight();
131  FX_FLOAT x_span = end_x - start_x;
132  FX_FLOAT y_span = end_y - start_y;
133  FX_FLOAT axis_len_square = (x_span * x_span) + (y_span * y_span);
134  CFX_Matrix matrix;
135  matrix.SetReverse(*pObject2Bitmap);
136  uint32_t total_results =
137      std::max(CountOutputs(funcs), pCS->CountComponents());
138  CFX_FixedBufGrow<FX_FLOAT, 16> result_array(total_results);
139  FX_FLOAT* pResults = result_array;
140  FXSYS_memset(pResults, 0, total_results * sizeof(FX_FLOAT));
141  uint32_t rgb_array[SHADING_STEPS];
142  for (int i = 0; i < SHADING_STEPS; i++) {
143    FX_FLOAT input = (t_max - t_min) * i / SHADING_STEPS + t_min;
144    int offset = 0;
145    for (const auto& func : funcs) {
146      if (func) {
147        int nresults = 0;
148        if (func->Call(&input, 1, pResults + offset, nresults))
149          offset += nresults;
150      }
151    }
152    FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
153    pCS->GetRGB(pResults, R, G, B);
154    rgb_array[i] =
155        FXARGB_TODIB(FXARGB_MAKE(alpha, FXSYS_round(R * 255),
156                                 FXSYS_round(G * 255), FXSYS_round(B * 255)));
157  }
158  int pitch = pBitmap->GetPitch();
159  for (int row = 0; row < height; row++) {
160    uint32_t* dib_buf = (uint32_t*)(pBitmap->GetBuffer() + row * pitch);
161    for (int column = 0; column < width; column++) {
162      CFX_PointF pos = matrix.Transform(CFX_PointF(
163          static_cast<FX_FLOAT>(column), static_cast<FX_FLOAT>(row)));
164      FX_FLOAT scale =
165          (((pos.x - start_x) * x_span) + ((pos.y - start_y) * y_span)) /
166          axis_len_square;
167      int index = (int32_t)(scale * (SHADING_STEPS - 1));
168      if (index < 0) {
169        if (!bStartExtend)
170          continue;
171
172        index = 0;
173      } else if (index >= SHADING_STEPS) {
174        if (!bEndExtend)
175          continue;
176
177        index = SHADING_STEPS - 1;
178      }
179      dib_buf[column] = rgb_array[index];
180    }
181  }
182}
183
184void DrawRadialShading(CFX_DIBitmap* pBitmap,
185                       CFX_Matrix* pObject2Bitmap,
186                       CPDF_Dictionary* pDict,
187                       const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
188                       CPDF_ColorSpace* pCS,
189                       int alpha) {
190  ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
191  CPDF_Array* pCoords = pDict->GetArrayFor("Coords");
192  if (!pCoords)
193    return;
194
195  FX_FLOAT start_x = pCoords->GetNumberAt(0);
196  FX_FLOAT start_y = pCoords->GetNumberAt(1);
197  FX_FLOAT start_r = pCoords->GetNumberAt(2);
198  FX_FLOAT end_x = pCoords->GetNumberAt(3);
199  FX_FLOAT end_y = pCoords->GetNumberAt(4);
200  FX_FLOAT end_r = pCoords->GetNumberAt(5);
201  CFX_Matrix matrix;
202  matrix.SetReverse(*pObject2Bitmap);
203  FX_FLOAT t_min = 0;
204  FX_FLOAT t_max = 1.0f;
205  CPDF_Array* pArray = pDict->GetArrayFor("Domain");
206  if (pArray) {
207    t_min = pArray->GetNumberAt(0);
208    t_max = pArray->GetNumberAt(1);
209  }
210  bool bStartExtend = false;
211  bool bEndExtend = false;
212  pArray = pDict->GetArrayFor("Extend");
213  if (pArray) {
214    bStartExtend = !!pArray->GetIntegerAt(0);
215    bEndExtend = !!pArray->GetIntegerAt(1);
216  }
217  uint32_t total_results =
218      std::max(CountOutputs(funcs), pCS->CountComponents());
219  CFX_FixedBufGrow<FX_FLOAT, 16> result_array(total_results);
220  FX_FLOAT* pResults = result_array;
221  FXSYS_memset(pResults, 0, total_results * sizeof(FX_FLOAT));
222  uint32_t rgb_array[SHADING_STEPS];
223  for (int i = 0; i < SHADING_STEPS; i++) {
224    FX_FLOAT input = (t_max - t_min) * i / SHADING_STEPS + t_min;
225    int offset = 0;
226    for (const auto& func : funcs) {
227      if (func) {
228        int nresults;
229        if (func->Call(&input, 1, pResults + offset, nresults))
230          offset += nresults;
231      }
232    }
233    FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
234    pCS->GetRGB(pResults, R, G, B);
235    rgb_array[i] =
236        FXARGB_TODIB(FXARGB_MAKE(alpha, FXSYS_round(R * 255),
237                                 FXSYS_round(G * 255), FXSYS_round(B * 255)));
238  }
239  FX_FLOAT a = ((start_x - end_x) * (start_x - end_x)) +
240               ((start_y - end_y) * (start_y - end_y)) -
241               ((start_r - end_r) * (start_r - end_r));
242  int width = pBitmap->GetWidth();
243  int height = pBitmap->GetHeight();
244  int pitch = pBitmap->GetPitch();
245  bool bDecreasing = false;
246  if (start_r > end_r) {
247    int length = (int)FXSYS_sqrt((((start_x - end_x) * (start_x - end_x)) +
248                                  ((start_y - end_y) * (start_y - end_y))));
249    if (length < start_r - end_r) {
250      bDecreasing = true;
251    }
252  }
253  for (int row = 0; row < height; row++) {
254    uint32_t* dib_buf = (uint32_t*)(pBitmap->GetBuffer() + row * pitch);
255    for (int column = 0; column < width; column++) {
256      CFX_PointF pos = matrix.Transform(CFX_PointF(
257          static_cast<FX_FLOAT>(column), static_cast<FX_FLOAT>(row)));
258      FX_FLOAT b = -2 * (((pos.x - start_x) * (end_x - start_x)) +
259                         ((pos.y - start_y) * (end_y - start_y)) +
260                         (start_r * (end_r - start_r)));
261      FX_FLOAT c = ((pos.x - start_x) * (pos.x - start_x)) +
262                   ((pos.y - start_y) * (pos.y - start_y)) -
263                   (start_r * start_r);
264      FX_FLOAT s;
265      if (a == 0) {
266        s = -c / b;
267      } else {
268        FX_FLOAT b2_4ac = (b * b) - 4 * (a * c);
269        if (b2_4ac < 0) {
270          continue;
271        }
272        FX_FLOAT root = FXSYS_sqrt(b2_4ac);
273        FX_FLOAT s1, s2;
274        if (a > 0) {
275          s1 = (-b - root) / (2 * a);
276          s2 = (-b + root) / (2 * a);
277        } else {
278          s2 = (-b - root) / (2 * a);
279          s1 = (-b + root) / (2 * a);
280        }
281        if (bDecreasing) {
282          if (s1 >= 0 || bStartExtend) {
283            s = s1;
284          } else {
285            s = s2;
286          }
287        } else {
288          if (s2 <= 1.0f || bEndExtend) {
289            s = s2;
290          } else {
291            s = s1;
292          }
293        }
294        if ((start_r + s * (end_r - start_r)) < 0) {
295          continue;
296        }
297      }
298      int index = (int32_t)(s * (SHADING_STEPS - 1));
299      if (index < 0) {
300        if (!bStartExtend) {
301          continue;
302        }
303        index = 0;
304      }
305      if (index >= SHADING_STEPS) {
306        if (!bEndExtend) {
307          continue;
308        }
309        index = SHADING_STEPS - 1;
310      }
311      dib_buf[column] = rgb_array[index];
312    }
313  }
314}
315
316void DrawFuncShading(CFX_DIBitmap* pBitmap,
317                     CFX_Matrix* pObject2Bitmap,
318                     CPDF_Dictionary* pDict,
319                     const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
320                     CPDF_ColorSpace* pCS,
321                     int alpha) {
322  ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
323  CPDF_Array* pDomain = pDict->GetArrayFor("Domain");
324  FX_FLOAT xmin = 0, ymin = 0, xmax = 1.0f, ymax = 1.0f;
325  if (pDomain) {
326    xmin = pDomain->GetNumberAt(0);
327    xmax = pDomain->GetNumberAt(1);
328    ymin = pDomain->GetNumberAt(2);
329    ymax = pDomain->GetNumberAt(3);
330  }
331  CFX_Matrix mtDomain2Target = pDict->GetMatrixFor("Matrix");
332  CFX_Matrix matrix;
333  matrix.SetReverse(*pObject2Bitmap);
334
335  CFX_Matrix reverse_matrix;
336  reverse_matrix.SetReverse(mtDomain2Target);
337  matrix.Concat(reverse_matrix);
338  int width = pBitmap->GetWidth();
339  int height = pBitmap->GetHeight();
340  int pitch = pBitmap->GetPitch();
341  uint32_t total_results =
342      std::max(CountOutputs(funcs), pCS->CountComponents());
343  CFX_FixedBufGrow<FX_FLOAT, 16> result_array(total_results);
344  FX_FLOAT* pResults = result_array;
345  FXSYS_memset(pResults, 0, total_results * sizeof(FX_FLOAT));
346  for (int row = 0; row < height; row++) {
347    uint32_t* dib_buf = (uint32_t*)(pBitmap->GetBuffer() + row * pitch);
348    for (int column = 0; column < width; column++) {
349      CFX_PointF pos = matrix.Transform(CFX_PointF(
350          static_cast<FX_FLOAT>(column), static_cast<FX_FLOAT>(row)));
351      if (pos.x < xmin || pos.x > xmax || pos.y < ymin || pos.y > ymax)
352        continue;
353
354      FX_FLOAT input[] = {pos.x, pos.y};
355      int offset = 0;
356      for (const auto& func : funcs) {
357        if (func) {
358          int nresults;
359          if (func->Call(input, 2, pResults + offset, nresults))
360            offset += nresults;
361        }
362      }
363
364      FX_FLOAT R = 0.0f;
365      FX_FLOAT G = 0.0f;
366      FX_FLOAT B = 0.0f;
367      pCS->GetRGB(pResults, R, G, B);
368      dib_buf[column] = FXARGB_TODIB(FXARGB_MAKE(
369          alpha, (int32_t)(R * 255), (int32_t)(G * 255), (int32_t)(B * 255)));
370    }
371  }
372}
373
374bool GetScanlineIntersect(int y,
375                          const CFX_PointF& first,
376                          const CFX_PointF& second,
377                          FX_FLOAT* x) {
378  if (first.y == second.y)
379    return false;
380
381  if (first.y < second.y) {
382    if (y < first.y || y > second.y)
383      return false;
384  } else if (y < second.y || y > first.y) {
385    return false;
386  }
387  *x = first.x + ((second.x - first.x) * (y - first.y) / (second.y - first.y));
388  return true;
389}
390
391void DrawGouraud(CFX_DIBitmap* pBitmap,
392                 int alpha,
393                 CPDF_MeshVertex triangle[3]) {
394  FX_FLOAT min_y = triangle[0].position.y;
395  FX_FLOAT max_y = triangle[0].position.y;
396  for (int i = 1; i < 3; i++) {
397    min_y = std::min(min_y, triangle[i].position.y);
398    max_y = std::max(max_y, triangle[i].position.y);
399  }
400  if (min_y == max_y)
401    return;
402
403  int min_yi = std::max(static_cast<int>(FXSYS_floor(min_y)), 0);
404  int max_yi = static_cast<int>(FXSYS_ceil(max_y));
405
406  if (max_yi >= pBitmap->GetHeight())
407    max_yi = pBitmap->GetHeight() - 1;
408
409  for (int y = min_yi; y <= max_yi; y++) {
410    int nIntersects = 0;
411    FX_FLOAT inter_x[3];
412    FX_FLOAT r[3];
413    FX_FLOAT g[3];
414    FX_FLOAT b[3];
415    for (int i = 0; i < 3; i++) {
416      CPDF_MeshVertex& vertex1 = triangle[i];
417      CPDF_MeshVertex& vertex2 = triangle[(i + 1) % 3];
418      CFX_PointF& position1 = vertex1.position;
419      CFX_PointF& position2 = vertex2.position;
420      bool bIntersect =
421          GetScanlineIntersect(y, position1, position2, &inter_x[nIntersects]);
422      if (!bIntersect)
423        continue;
424
425      FX_FLOAT y_dist = (y - position1.y) / (position2.y - position1.y);
426      r[nIntersects] = vertex1.r + ((vertex2.r - vertex1.r) * y_dist);
427      g[nIntersects] = vertex1.g + ((vertex2.g - vertex1.g) * y_dist);
428      b[nIntersects] = vertex1.b + ((vertex2.b - vertex1.b) * y_dist);
429      nIntersects++;
430    }
431    if (nIntersects != 2)
432      continue;
433
434    int min_x, max_x, start_index, end_index;
435    if (inter_x[0] < inter_x[1]) {
436      min_x = (int)FXSYS_floor(inter_x[0]);
437      max_x = (int)FXSYS_ceil(inter_x[1]);
438      start_index = 0;
439      end_index = 1;
440    } else {
441      min_x = (int)FXSYS_floor(inter_x[1]);
442      max_x = (int)FXSYS_ceil(inter_x[0]);
443      start_index = 1;
444      end_index = 0;
445    }
446
447    int start_x = std::max(min_x, 0);
448    int end_x = max_x;
449    if (end_x > pBitmap->GetWidth())
450      end_x = pBitmap->GetWidth();
451
452    uint8_t* dib_buf =
453        pBitmap->GetBuffer() + y * pBitmap->GetPitch() + start_x * 4;
454    FX_FLOAT r_unit = (r[end_index] - r[start_index]) / (max_x - min_x);
455    FX_FLOAT g_unit = (g[end_index] - g[start_index]) / (max_x - min_x);
456    FX_FLOAT b_unit = (b[end_index] - b[start_index]) / (max_x - min_x);
457    FX_FLOAT R = r[start_index] + (start_x - min_x) * r_unit;
458    FX_FLOAT G = g[start_index] + (start_x - min_x) * g_unit;
459    FX_FLOAT B = b[start_index] + (start_x - min_x) * b_unit;
460    for (int x = start_x; x < end_x; x++) {
461      R += r_unit;
462      G += g_unit;
463      B += b_unit;
464      FXARGB_SETDIB(dib_buf,
465                    FXARGB_MAKE(alpha, (int32_t)(R * 255), (int32_t)(G * 255),
466                                (int32_t)(B * 255)));
467      dib_buf += 4;
468    }
469  }
470}
471
472void DrawFreeGouraudShading(
473    CFX_DIBitmap* pBitmap,
474    CFX_Matrix* pObject2Bitmap,
475    CPDF_Stream* pShadingStream,
476    const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
477    CPDF_ColorSpace* pCS,
478    int alpha) {
479  ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
480
481  CPDF_MeshStream stream(kFreeFormGouraudTriangleMeshShading, funcs,
482                         pShadingStream, pCS);
483  if (!stream.Load())
484    return;
485
486  CPDF_MeshVertex triangle[3];
487  FXSYS_memset(triangle, 0, sizeof(triangle));
488
489  while (!stream.BitStream()->IsEOF()) {
490    CPDF_MeshVertex vertex;
491    uint32_t flag;
492    if (!stream.ReadVertex(*pObject2Bitmap, &vertex, &flag))
493      return;
494
495    if (flag == 0) {
496      triangle[0] = vertex;
497      for (int j = 1; j < 3; j++) {
498        uint32_t tflag;
499        if (!stream.ReadVertex(*pObject2Bitmap, &triangle[j], &tflag))
500          return;
501      }
502    } else {
503      if (flag == 1)
504        triangle[0] = triangle[1];
505
506      triangle[1] = triangle[2];
507      triangle[2] = vertex;
508    }
509    DrawGouraud(pBitmap, alpha, triangle);
510  }
511}
512
513void DrawLatticeGouraudShading(
514    CFX_DIBitmap* pBitmap,
515    CFX_Matrix* pObject2Bitmap,
516    CPDF_Stream* pShadingStream,
517    const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
518    CPDF_ColorSpace* pCS,
519    int alpha) {
520  ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
521
522  int row_verts = pShadingStream->GetDict()->GetIntegerFor("VerticesPerRow");
523  if (row_verts < 2)
524    return;
525
526  CPDF_MeshStream stream(kLatticeFormGouraudTriangleMeshShading, funcs,
527                         pShadingStream, pCS);
528  if (!stream.Load())
529    return;
530
531  std::unique_ptr<CPDF_MeshVertex, FxFreeDeleter> vertex(
532      FX_Alloc2D(CPDF_MeshVertex, row_verts, 2));
533  if (!stream.ReadVertexRow(*pObject2Bitmap, row_verts, vertex.get()))
534    return;
535
536  int last_index = 0;
537  while (1) {
538    CPDF_MeshVertex* last_row = vertex.get() + last_index * row_verts;
539    CPDF_MeshVertex* this_row = vertex.get() + (1 - last_index) * row_verts;
540    if (!stream.ReadVertexRow(*pObject2Bitmap, row_verts, this_row))
541      return;
542
543    CPDF_MeshVertex triangle[3];
544    for (int i = 1; i < row_verts; i++) {
545      triangle[0] = last_row[i];
546      triangle[1] = this_row[i - 1];
547      triangle[2] = last_row[i - 1];
548      DrawGouraud(pBitmap, alpha, triangle);
549      triangle[2] = this_row[i];
550      DrawGouraud(pBitmap, alpha, triangle);
551    }
552    last_index = 1 - last_index;
553  }
554}
555
556struct Coon_BezierCoeff {
557  float a, b, c, d;
558  void FromPoints(float p0, float p1, float p2, float p3) {
559    a = -p0 + 3 * p1 - 3 * p2 + p3;
560    b = 3 * p0 - 6 * p1 + 3 * p2;
561    c = -3 * p0 + 3 * p1;
562    d = p0;
563  }
564  Coon_BezierCoeff first_half() {
565    Coon_BezierCoeff result;
566    result.a = a / 8;
567    result.b = b / 4;
568    result.c = c / 2;
569    result.d = d;
570    return result;
571  }
572  Coon_BezierCoeff second_half() {
573    Coon_BezierCoeff result;
574    result.a = a / 8;
575    result.b = 3 * a / 8 + b / 4;
576    result.c = 3 * a / 8 + b / 2 + c / 2;
577    result.d = a / 8 + b / 4 + c / 2 + d;
578    return result;
579  }
580  void GetPoints(float p[4]) {
581    p[0] = d;
582    p[1] = c / 3 + p[0];
583    p[2] = b / 3 - p[0] + 2 * p[1];
584    p[3] = a + p[0] - 3 * p[1] + 3 * p[2];
585  }
586  void GetPointsReverse(float p[4]) {
587    p[3] = d;
588    p[2] = c / 3 + p[3];
589    p[1] = b / 3 - p[3] + 2 * p[2];
590    p[0] = a + p[3] - 3 * p[2] + 3 * p[1];
591  }
592  void BezierInterpol(Coon_BezierCoeff& C1,
593                      Coon_BezierCoeff& C2,
594                      Coon_BezierCoeff& D1,
595                      Coon_BezierCoeff& D2) {
596    a = (D1.a + D2.a) / 2;
597    b = (D1.b + D2.b) / 2;
598    c = (D1.c + D2.c) / 2 - (C1.a / 8 + C1.b / 4 + C1.c / 2) +
599        (C2.a / 8 + C2.b / 4) + (-C1.d + D2.d) / 2 - (C2.a + C2.b) / 2;
600    d = C1.a / 8 + C1.b / 4 + C1.c / 2 + C1.d;
601  }
602  float Distance() {
603    float dis = a + b + c;
604    return dis < 0 ? -dis : dis;
605  }
606};
607
608struct Coon_Bezier {
609  Coon_BezierCoeff x, y;
610  void FromPoints(float x0,
611                  float y0,
612                  float x1,
613                  float y1,
614                  float x2,
615                  float y2,
616                  float x3,
617                  float y3) {
618    x.FromPoints(x0, x1, x2, x3);
619    y.FromPoints(y0, y1, y2, y3);
620  }
621
622  Coon_Bezier first_half() {
623    Coon_Bezier result;
624    result.x = x.first_half();
625    result.y = y.first_half();
626    return result;
627  }
628
629  Coon_Bezier second_half() {
630    Coon_Bezier result;
631    result.x = x.second_half();
632    result.y = y.second_half();
633    return result;
634  }
635
636  void BezierInterpol(Coon_Bezier& C1,
637                      Coon_Bezier& C2,
638                      Coon_Bezier& D1,
639                      Coon_Bezier& D2) {
640    x.BezierInterpol(C1.x, C2.x, D1.x, D2.x);
641    y.BezierInterpol(C1.y, C2.y, D1.y, D2.y);
642  }
643
644  void GetPoints(std::vector<FX_PATHPOINT>& pPoints, size_t start_idx) {
645    float p[4];
646    int i;
647    x.GetPoints(p);
648    for (i = 0; i < 4; i++)
649      pPoints[start_idx + i].m_Point.x = p[i];
650
651    y.GetPoints(p);
652    for (i = 0; i < 4; i++)
653      pPoints[start_idx + i].m_Point.y = p[i];
654  }
655
656  void GetPointsReverse(std::vector<FX_PATHPOINT>& pPoints, size_t start_idx) {
657    float p[4];
658    int i;
659    x.GetPointsReverse(p);
660    for (i = 0; i < 4; i++)
661      pPoints[i + start_idx].m_Point.x = p[i];
662
663    y.GetPointsReverse(p);
664    for (i = 0; i < 4; i++)
665      pPoints[i + start_idx].m_Point.y = p[i];
666  }
667
668  float Distance() { return x.Distance() + y.Distance(); }
669};
670
671int BiInterpolImpl(int c0,
672                   int c1,
673                   int c2,
674                   int c3,
675                   int x,
676                   int y,
677                   int x_scale,
678                   int y_scale) {
679  int x1 = c0 + (c3 - c0) * x / x_scale;
680  int x2 = c1 + (c2 - c1) * x / x_scale;
681  return x1 + (x2 - x1) * y / y_scale;
682}
683
684struct Coon_Color {
685  Coon_Color() { FXSYS_memset(comp, 0, sizeof(int) * 3); }
686  int comp[3];
687
688  void BiInterpol(Coon_Color colors[4],
689                  int x,
690                  int y,
691                  int x_scale,
692                  int y_scale) {
693    for (int i = 0; i < 3; i++) {
694      comp[i] = BiInterpolImpl(colors[0].comp[i], colors[1].comp[i],
695                               colors[2].comp[i], colors[3].comp[i], x, y,
696                               x_scale, y_scale);
697    }
698  }
699
700  int Distance(Coon_Color& o) {
701    return std::max({FXSYS_abs(comp[0] - o.comp[0]),
702                     FXSYS_abs(comp[1] - o.comp[1]),
703                     FXSYS_abs(comp[2] - o.comp[2])});
704  }
705};
706
707#define COONCOLOR_THRESHOLD 4
708struct CPDF_PatchDrawer {
709  Coon_Color patch_colors[4];
710  int max_delta;
711  CFX_PathData path;
712  CFX_RenderDevice* pDevice;
713  int fill_mode;
714  int alpha;
715  void Draw(int x_scale,
716            int y_scale,
717            int left,
718            int bottom,
719            Coon_Bezier C1,
720            Coon_Bezier C2,
721            Coon_Bezier D1,
722            Coon_Bezier D2) {
723    bool bSmall = C1.Distance() < 2 && C2.Distance() < 2 && D1.Distance() < 2 &&
724                  D2.Distance() < 2;
725    Coon_Color div_colors[4];
726    int d_bottom = 0;
727    int d_left = 0;
728    int d_top = 0;
729    int d_right = 0;
730    div_colors[0].BiInterpol(patch_colors, left, bottom, x_scale, y_scale);
731    if (!bSmall) {
732      div_colors[1].BiInterpol(patch_colors, left, bottom + 1, x_scale,
733                               y_scale);
734      div_colors[2].BiInterpol(patch_colors, left + 1, bottom + 1, x_scale,
735                               y_scale);
736      div_colors[3].BiInterpol(patch_colors, left + 1, bottom, x_scale,
737                               y_scale);
738      d_bottom = div_colors[3].Distance(div_colors[0]);
739      d_left = div_colors[1].Distance(div_colors[0]);
740      d_top = div_colors[1].Distance(div_colors[2]);
741      d_right = div_colors[2].Distance(div_colors[3]);
742    }
743
744    if (bSmall ||
745        (d_bottom < COONCOLOR_THRESHOLD && d_left < COONCOLOR_THRESHOLD &&
746         d_top < COONCOLOR_THRESHOLD && d_right < COONCOLOR_THRESHOLD)) {
747      std::vector<FX_PATHPOINT>& pPoints = path.GetPoints();
748      C1.GetPoints(pPoints, 0);
749      D2.GetPoints(pPoints, 3);
750      C2.GetPointsReverse(pPoints, 6);
751      D1.GetPointsReverse(pPoints, 9);
752      int fillFlags = FXFILL_WINDING | FXFILL_FULLCOVER;
753      if (fill_mode & RENDER_NOPATHSMOOTH) {
754        fillFlags |= FXFILL_NOPATHSMOOTH;
755      }
756      pDevice->DrawPath(
757          &path, nullptr, nullptr,
758          FXARGB_MAKE(alpha, div_colors[0].comp[0], div_colors[0].comp[1],
759                      div_colors[0].comp[2]),
760          0, fillFlags);
761    } else {
762      if (d_bottom < COONCOLOR_THRESHOLD && d_top < COONCOLOR_THRESHOLD) {
763        Coon_Bezier m1;
764        m1.BezierInterpol(D1, D2, C1, C2);
765        y_scale *= 2;
766        bottom *= 2;
767        Draw(x_scale, y_scale, left, bottom, C1, m1, D1.first_half(),
768             D2.first_half());
769        Draw(x_scale, y_scale, left, bottom + 1, m1, C2, D1.second_half(),
770             D2.second_half());
771      } else if (d_left < COONCOLOR_THRESHOLD &&
772                 d_right < COONCOLOR_THRESHOLD) {
773        Coon_Bezier m2;
774        m2.BezierInterpol(C1, C2, D1, D2);
775        x_scale *= 2;
776        left *= 2;
777        Draw(x_scale, y_scale, left, bottom, C1.first_half(), C2.first_half(),
778             D1, m2);
779        Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(),
780             C2.second_half(), m2, D2);
781      } else {
782        Coon_Bezier m1, m2;
783        m1.BezierInterpol(D1, D2, C1, C2);
784        m2.BezierInterpol(C1, C2, D1, D2);
785        Coon_Bezier m1f = m1.first_half();
786        Coon_Bezier m1s = m1.second_half();
787        Coon_Bezier m2f = m2.first_half();
788        Coon_Bezier m2s = m2.second_half();
789        x_scale *= 2;
790        y_scale *= 2;
791        left *= 2;
792        bottom *= 2;
793        Draw(x_scale, y_scale, left, bottom, C1.first_half(), m1f,
794             D1.first_half(), m2f);
795        Draw(x_scale, y_scale, left, bottom + 1, m1f, C2.first_half(),
796             D1.second_half(), m2s);
797        Draw(x_scale, y_scale, left + 1, bottom, C1.second_half(), m1s, m2f,
798             D2.first_half());
799        Draw(x_scale, y_scale, left + 1, bottom + 1, m1s, C2.second_half(), m2s,
800             D2.second_half());
801      }
802    }
803  }
804};
805
806void DrawCoonPatchMeshes(
807    ShadingType type,
808    CFX_DIBitmap* pBitmap,
809    CFX_Matrix* pObject2Bitmap,
810    CPDF_Stream* pShadingStream,
811    const std::vector<std::unique_ptr<CPDF_Function>>& funcs,
812    CPDF_ColorSpace* pCS,
813    int fill_mode,
814    int alpha) {
815  ASSERT(pBitmap->GetFormat() == FXDIB_Argb);
816  ASSERT(type == kCoonsPatchMeshShading ||
817         type == kTensorProductPatchMeshShading);
818
819  CFX_FxgeDevice device;
820  device.Attach(pBitmap, false, nullptr, false);
821  CPDF_MeshStream stream(type, funcs, pShadingStream, pCS);
822  if (!stream.Load())
823    return;
824
825  CPDF_PatchDrawer patch;
826  patch.alpha = alpha;
827  patch.pDevice = &device;
828  patch.fill_mode = fill_mode;
829
830  for (int i = 0; i < 13; i++) {
831    patch.path.AppendPoint(
832        CFX_PointF(), i == 0 ? FXPT_TYPE::MoveTo : FXPT_TYPE::BezierTo, false);
833  }
834
835  CFX_PointF coords[16];
836  int point_count = type == kTensorProductPatchMeshShading ? 16 : 12;
837  while (!stream.BitStream()->IsEOF()) {
838    if (!stream.CanReadFlag())
839      break;
840    uint32_t flag = stream.ReadFlag();
841    int iStartPoint = 0, iStartColor = 0, i = 0;
842    if (flag) {
843      iStartPoint = 4;
844      iStartColor = 2;
845      CFX_PointF tempCoords[4];
846      for (i = 0; i < 4; i++) {
847        tempCoords[i] = coords[(flag * 3 + i) % 12];
848      }
849      FXSYS_memcpy(coords, tempCoords, sizeof(tempCoords));
850      Coon_Color tempColors[2];
851      tempColors[0] = patch.patch_colors[flag];
852      tempColors[1] = patch.patch_colors[(flag + 1) % 4];
853      FXSYS_memcpy(patch.patch_colors, tempColors, sizeof(Coon_Color) * 2);
854    }
855    for (i = iStartPoint; i < point_count; i++) {
856      if (!stream.CanReadCoords())
857        break;
858      coords[i] = pObject2Bitmap->Transform(stream.ReadCoords());
859    }
860
861    for (i = iStartColor; i < 4; i++) {
862      if (!stream.CanReadColor())
863        break;
864
865      FX_FLOAT r;
866      FX_FLOAT g;
867      FX_FLOAT b;
868      std::tie(r, g, b) = stream.ReadColor();
869
870      patch.patch_colors[i].comp[0] = (int32_t)(r * 255);
871      patch.patch_colors[i].comp[1] = (int32_t)(g * 255);
872      patch.patch_colors[i].comp[2] = (int32_t)(b * 255);
873    }
874    CFX_FloatRect bbox = CFX_FloatRect::GetBBox(coords, point_count);
875    if (bbox.right <= 0 || bbox.left >= (FX_FLOAT)pBitmap->GetWidth() ||
876        bbox.top <= 0 || bbox.bottom >= (FX_FLOAT)pBitmap->GetHeight()) {
877      continue;
878    }
879    Coon_Bezier C1, C2, D1, D2;
880    C1.FromPoints(coords[0].x, coords[0].y, coords[11].x, coords[11].y,
881                  coords[10].x, coords[10].y, coords[9].x, coords[9].y);
882    C2.FromPoints(coords[3].x, coords[3].y, coords[4].x, coords[4].y,
883                  coords[5].x, coords[5].y, coords[6].x, coords[6].y);
884    D1.FromPoints(coords[0].x, coords[0].y, coords[1].x, coords[1].y,
885                  coords[2].x, coords[2].y, coords[3].x, coords[3].y);
886    D2.FromPoints(coords[9].x, coords[9].y, coords[8].x, coords[8].y,
887                  coords[7].x, coords[7].y, coords[6].x, coords[6].y);
888    patch.Draw(1, 1, 0, 0, C1, C2, D1, D2);
889  }
890}
891
892std::unique_ptr<CFX_DIBitmap> DrawPatternBitmap(
893    CPDF_Document* pDoc,
894    CPDF_PageRenderCache* pCache,
895    CPDF_TilingPattern* pPattern,
896    const CFX_Matrix* pObject2Device,
897    int width,
898    int height,
899    int flags) {
900  std::unique_ptr<CFX_DIBitmap> pBitmap(new CFX_DIBitmap);
901  if (!pBitmap->Create(width, height,
902                       pPattern->colored() ? FXDIB_Argb : FXDIB_8bppMask)) {
903    return nullptr;
904  }
905  CFX_FxgeDevice bitmap_device;
906  bitmap_device.Attach(pBitmap.get(), false, nullptr, false);
907  pBitmap->Clear(0);
908  CFX_FloatRect cell_bbox = pPattern->bbox();
909  pPattern->pattern_to_form()->TransformRect(cell_bbox);
910  pObject2Device->TransformRect(cell_bbox);
911  CFX_FloatRect bitmap_rect(0.0f, 0.0f, (FX_FLOAT)width, (FX_FLOAT)height);
912  CFX_Matrix mtAdjust;
913  mtAdjust.MatchRect(bitmap_rect, cell_bbox);
914
915  CFX_Matrix mtPattern2Bitmap = *pObject2Device;
916  mtPattern2Bitmap.Concat(mtAdjust);
917  CPDF_RenderOptions options;
918  if (!pPattern->colored())
919    options.m_ColorMode = RENDER_COLOR_ALPHA;
920
921  flags |= RENDER_FORCE_HALFTONE;
922  options.m_Flags = flags;
923  CPDF_RenderContext context(pDoc, pCache);
924  context.AppendLayer(pPattern->form(), &mtPattern2Bitmap);
925  context.Render(&bitmap_device, &options, nullptr);
926#if defined _SKIA_SUPPORT_PATHS_
927  bitmap_device.Flush();
928  pBitmap->UnPreMultiply();
929#endif
930  return pBitmap;
931}
932
933bool IsAvailableMatrix(const CFX_Matrix& matrix) {
934  if (matrix.a == 0 || matrix.d == 0)
935    return matrix.b != 0 && matrix.c != 0;
936
937  if (matrix.b == 0 || matrix.c == 0)
938    return matrix.a != 0 && matrix.d != 0;
939
940  return true;
941}
942
943}  // namespace
944
945// static
946int CPDF_RenderStatus::s_CurrentRecursionDepth = 0;
947
948CPDF_RenderStatus::CPDF_RenderStatus()
949    : m_pFormResource(nullptr),
950      m_pPageResource(nullptr),
951      m_pContext(nullptr),
952      m_bStopped(false),
953      m_pDevice(nullptr),
954      m_pCurObj(nullptr),
955      m_pStopObj(nullptr),
956      m_bPrint(false),
957      m_Transparency(0),
958      m_bDropObjects(false),
959      m_bStdCS(false),
960      m_GroupFamily(0),
961      m_bLoadMask(false),
962      m_pType3Char(nullptr),
963      m_T3FillColor(0),
964      m_curBlend(FXDIB_BLEND_NORMAL) {}
965
966CPDF_RenderStatus::~CPDF_RenderStatus() {}
967
968bool CPDF_RenderStatus::Initialize(CPDF_RenderContext* pContext,
969                                   CFX_RenderDevice* pDevice,
970                                   const CFX_Matrix* pDeviceMatrix,
971                                   const CPDF_PageObject* pStopObj,
972                                   const CPDF_RenderStatus* pParentState,
973                                   const CPDF_GraphicStates* pInitialStates,
974                                   const CPDF_RenderOptions* pOptions,
975                                   int transparency,
976                                   bool bDropObjects,
977                                   CPDF_Dictionary* pFormResource,
978                                   bool bStdCS,
979                                   CPDF_Type3Char* pType3Char,
980                                   FX_ARGB fill_color,
981                                   uint32_t GroupFamily,
982                                   bool bLoadMask) {
983  m_pContext = pContext;
984  m_pDevice = pDevice;
985  m_bPrint = m_pDevice->GetDeviceClass() != FXDC_DISPLAY;
986  if (pDeviceMatrix) {
987    m_DeviceMatrix = *pDeviceMatrix;
988  }
989  m_pStopObj = pStopObj;
990  if (pOptions) {
991    m_Options = *pOptions;
992  }
993  m_bDropObjects = bDropObjects;
994  m_bStdCS = bStdCS;
995  m_T3FillColor = fill_color;
996  m_pType3Char = pType3Char;
997  m_GroupFamily = GroupFamily;
998  m_bLoadMask = bLoadMask;
999  m_pFormResource = pFormResource;
1000  m_pPageResource = m_pContext->GetPageResources();
1001  if (pInitialStates && !m_pType3Char) {
1002    m_InitialStates.CopyStates(*pInitialStates);
1003    if (pParentState) {
1004      if (!m_InitialStates.m_ColorState.HasFillColor()) {
1005        m_InitialStates.m_ColorState.SetFillRGB(
1006            pParentState->m_InitialStates.m_ColorState.GetFillRGB());
1007        m_InitialStates.m_ColorState.GetMutableFillColor()->Copy(
1008            pParentState->m_InitialStates.m_ColorState.GetFillColor());
1009      }
1010      if (!m_InitialStates.m_ColorState.HasStrokeColor()) {
1011        m_InitialStates.m_ColorState.SetStrokeRGB(
1012            pParentState->m_InitialStates.m_ColorState.GetFillRGB());
1013        m_InitialStates.m_ColorState.GetMutableStrokeColor()->Copy(
1014            pParentState->m_InitialStates.m_ColorState.GetStrokeColor());
1015      }
1016    }
1017  } else {
1018    m_InitialStates.DefaultStates();
1019  }
1020  m_pImageRenderer.reset();
1021  m_Transparency = transparency;
1022  return true;
1023}
1024
1025void CPDF_RenderStatus::RenderObjectList(
1026    const CPDF_PageObjectHolder* pObjectHolder,
1027    const CFX_Matrix* pObj2Device) {
1028#if defined _SKIA_SUPPORT_
1029  DebugVerifyDeviceIsPreMultiplied();
1030#endif
1031  CFX_FloatRect clip_rect(m_pDevice->GetClipBox());
1032  CFX_Matrix device2object;
1033  device2object.SetReverse(*pObj2Device);
1034  device2object.TransformRect(clip_rect);
1035
1036  for (const auto& pCurObj : *pObjectHolder->GetPageObjectList()) {
1037    if (pCurObj.get() == m_pStopObj) {
1038      m_bStopped = true;
1039      return;
1040    }
1041    if (!pCurObj)
1042      continue;
1043
1044    if (pCurObj->m_Left > clip_rect.right ||
1045        pCurObj->m_Right < clip_rect.left ||
1046        pCurObj->m_Bottom > clip_rect.top ||
1047        pCurObj->m_Top < clip_rect.bottom) {
1048      continue;
1049    }
1050    RenderSingleObject(pCurObj.get(), pObj2Device);
1051    if (m_bStopped)
1052      return;
1053  }
1054#if defined _SKIA_SUPPORT_
1055  DebugVerifyDeviceIsPreMultiplied();
1056#endif
1057}
1058
1059void CPDF_RenderStatus::RenderSingleObject(CPDF_PageObject* pObj,
1060                                           const CFX_Matrix* pObj2Device) {
1061#if defined _SKIA_SUPPORT_
1062  DebugVerifyDeviceIsPreMultiplied();
1063#endif
1064  CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth);
1065  if (++s_CurrentRecursionDepth > kRenderMaxRecursionDepth) {
1066    return;
1067  }
1068  m_pCurObj = pObj;
1069  if (m_Options.m_pOCContext && pObj->m_ContentMark) {
1070    if (!m_Options.m_pOCContext->CheckObjectVisible(pObj)) {
1071      return;
1072    }
1073  }
1074  ProcessClipPath(pObj->m_ClipPath, pObj2Device);
1075  if (ProcessTransparency(pObj, pObj2Device)) {
1076    return;
1077  }
1078  ProcessObjectNoClip(pObj, pObj2Device);
1079#if defined _SKIA_SUPPORT_
1080  DebugVerifyDeviceIsPreMultiplied();
1081#endif
1082}
1083
1084bool CPDF_RenderStatus::ContinueSingleObject(CPDF_PageObject* pObj,
1085                                             const CFX_Matrix* pObj2Device,
1086                                             IFX_Pause* pPause) {
1087  if (m_pImageRenderer) {
1088    if (m_pImageRenderer->Continue(pPause))
1089      return true;
1090
1091    if (!m_pImageRenderer->GetResult())
1092      DrawObjWithBackground(pObj, pObj2Device);
1093    m_pImageRenderer.reset();
1094    return false;
1095  }
1096
1097  m_pCurObj = pObj;
1098  if (m_Options.m_pOCContext && pObj->m_ContentMark &&
1099      !m_Options.m_pOCContext->CheckObjectVisible(pObj)) {
1100    return false;
1101  }
1102
1103  ProcessClipPath(pObj->m_ClipPath, pObj2Device);
1104  if (ProcessTransparency(pObj, pObj2Device))
1105    return false;
1106
1107  if (pObj->IsImage()) {
1108    m_pImageRenderer = pdfium::MakeUnique<CPDF_ImageRenderer>();
1109    if (!m_pImageRenderer->Start(this, pObj, pObj2Device, false,
1110                                 FXDIB_BLEND_NORMAL)) {
1111      if (!m_pImageRenderer->GetResult())
1112        DrawObjWithBackground(pObj, pObj2Device);
1113      m_pImageRenderer.reset();
1114      return false;
1115    }
1116    return ContinueSingleObject(pObj, pObj2Device, pPause);
1117  }
1118
1119  ProcessObjectNoClip(pObj, pObj2Device);
1120  return false;
1121}
1122
1123bool CPDF_RenderStatus::GetObjectClippedRect(const CPDF_PageObject* pObj,
1124                                             const CFX_Matrix* pObj2Device,
1125                                             bool bLogical,
1126                                             FX_RECT& rect) const {
1127  rect = pObj->GetBBox(pObj2Device);
1128  FX_RECT rtClip = m_pDevice->GetClipBox();
1129  if (!bLogical) {
1130    CFX_Matrix dCTM = m_pDevice->GetCTM();
1131    FX_FLOAT a = FXSYS_fabs(dCTM.a);
1132    FX_FLOAT d = FXSYS_fabs(dCTM.d);
1133    if (a != 1.0f || d != 1.0f) {
1134      rect.right = rect.left + (int32_t)FXSYS_ceil((FX_FLOAT)rect.Width() * a);
1135      rect.bottom = rect.top + (int32_t)FXSYS_ceil((FX_FLOAT)rect.Height() * d);
1136      rtClip.right =
1137          rtClip.left + (int32_t)FXSYS_ceil((FX_FLOAT)rtClip.Width() * a);
1138      rtClip.bottom =
1139          rtClip.top + (int32_t)FXSYS_ceil((FX_FLOAT)rtClip.Height() * d);
1140    }
1141  }
1142  rect.Intersect(rtClip);
1143  return rect.IsEmpty();
1144}
1145
1146void CPDF_RenderStatus::ProcessObjectNoClip(CPDF_PageObject* pObj,
1147                                            const CFX_Matrix* pObj2Device) {
1148#if defined _SKIA_SUPPORT_
1149  DebugVerifyDeviceIsPreMultiplied();
1150#endif
1151  bool bRet = false;
1152  switch (pObj->GetType()) {
1153    case CPDF_PageObject::TEXT:
1154      bRet = ProcessText(pObj->AsText(), pObj2Device, nullptr);
1155      break;
1156    case CPDF_PageObject::PATH:
1157      bRet = ProcessPath(pObj->AsPath(), pObj2Device);
1158      break;
1159    case CPDF_PageObject::IMAGE:
1160      bRet = ProcessImage(pObj->AsImage(), pObj2Device);
1161      break;
1162    case CPDF_PageObject::SHADING:
1163      ProcessShading(pObj->AsShading(), pObj2Device);
1164      return;
1165    case CPDF_PageObject::FORM:
1166      bRet = ProcessForm(pObj->AsForm(), pObj2Device);
1167      break;
1168  }
1169  if (!bRet)
1170    DrawObjWithBackground(pObj, pObj2Device);
1171#if defined _SKIA_SUPPORT_
1172  DebugVerifyDeviceIsPreMultiplied();
1173#endif
1174}
1175
1176bool CPDF_RenderStatus::DrawObjWithBlend(CPDF_PageObject* pObj,
1177                                         const CFX_Matrix* pObj2Device) {
1178  bool bRet = false;
1179  switch (pObj->GetType()) {
1180    case CPDF_PageObject::PATH:
1181      bRet = ProcessPath(pObj->AsPath(), pObj2Device);
1182      break;
1183    case CPDF_PageObject::IMAGE:
1184      bRet = ProcessImage(pObj->AsImage(), pObj2Device);
1185      break;
1186    case CPDF_PageObject::FORM:
1187      bRet = ProcessForm(pObj->AsForm(), pObj2Device);
1188      break;
1189    default:
1190      break;
1191  }
1192  return bRet;
1193}
1194
1195void CPDF_RenderStatus::GetScaledMatrix(CFX_Matrix& matrix) const {
1196  CFX_Matrix dCTM = m_pDevice->GetCTM();
1197  matrix.a *= FXSYS_fabs(dCTM.a);
1198  matrix.d *= FXSYS_fabs(dCTM.d);
1199}
1200
1201void CPDF_RenderStatus::DrawObjWithBackground(CPDF_PageObject* pObj,
1202                                              const CFX_Matrix* pObj2Device) {
1203  FX_RECT rect;
1204  if (GetObjectClippedRect(pObj, pObj2Device, false, rect)) {
1205    return;
1206  }
1207  int res = 300;
1208  if (pObj->IsImage() &&
1209      m_pDevice->GetDeviceCaps(FXDC_DEVICE_CLASS) == FXDC_PRINTER) {
1210    res = 0;
1211  }
1212  CPDF_ScaledRenderBuffer buffer;
1213  if (!buffer.Initialize(m_pContext, m_pDevice, rect, pObj, &m_Options, res)) {
1214    return;
1215  }
1216  CFX_Matrix matrix = *pObj2Device;
1217  matrix.Concat(*buffer.GetMatrix());
1218  GetScaledMatrix(matrix);
1219  CPDF_Dictionary* pFormResource = nullptr;
1220  if (pObj->IsForm()) {
1221    const CPDF_FormObject* pFormObj = pObj->AsForm();
1222    if (pFormObj->m_pForm && pFormObj->m_pForm->m_pFormDict) {
1223      pFormResource = pFormObj->m_pForm->m_pFormDict->GetDictFor("Resources");
1224    }
1225  }
1226  CPDF_RenderStatus status;
1227  status.Initialize(m_pContext, buffer.GetDevice(), buffer.GetMatrix(), nullptr,
1228                    nullptr, nullptr, &m_Options, m_Transparency,
1229                    m_bDropObjects, pFormResource);
1230  status.RenderSingleObject(pObj, &matrix);
1231  buffer.OutputToDevice();
1232}
1233
1234bool CPDF_RenderStatus::ProcessForm(const CPDF_FormObject* pFormObj,
1235                                    const CFX_Matrix* pObj2Device) {
1236#if defined _SKIA_SUPPORT_
1237  DebugVerifyDeviceIsPreMultiplied();
1238#endif
1239  CPDF_Dictionary* pOC = pFormObj->m_pForm->m_pFormDict->GetDictFor("OC");
1240  if (pOC && m_Options.m_pOCContext &&
1241      !m_Options.m_pOCContext->CheckOCGVisible(pOC)) {
1242    return true;
1243  }
1244  CFX_Matrix matrix = pFormObj->m_FormMatrix;
1245  matrix.Concat(*pObj2Device);
1246  CPDF_Dictionary* pResources = nullptr;
1247  if (pFormObj->m_pForm && pFormObj->m_pForm->m_pFormDict) {
1248    pResources = pFormObj->m_pForm->m_pFormDict->GetDictFor("Resources");
1249  }
1250  CPDF_RenderStatus status;
1251  status.Initialize(m_pContext, m_pDevice, nullptr, m_pStopObj, this, pFormObj,
1252                    &m_Options, m_Transparency, m_bDropObjects, pResources,
1253                    false);
1254  status.m_curBlend = m_curBlend;
1255  m_pDevice->SaveState();
1256  status.RenderObjectList(pFormObj->m_pForm.get(), &matrix);
1257  m_bStopped = status.m_bStopped;
1258  m_pDevice->RestoreState(false);
1259#if defined _SKIA_SUPPORT_
1260  DebugVerifyDeviceIsPreMultiplied();
1261#endif
1262  return true;
1263}
1264
1265bool CPDF_RenderStatus::ProcessPath(CPDF_PathObject* pPathObj,
1266                                    const CFX_Matrix* pObj2Device) {
1267  int FillType = pPathObj->m_FillType;
1268  bool bStroke = pPathObj->m_bStroke;
1269  ProcessPathPattern(pPathObj, pObj2Device, FillType, bStroke);
1270  if (FillType == 0 && !bStroke)
1271    return true;
1272
1273  uint32_t fill_argb = FillType ? GetFillArgb(pPathObj) : 0;
1274  uint32_t stroke_argb = bStroke ? GetStrokeArgb(pPathObj) : 0;
1275  CFX_Matrix path_matrix = pPathObj->m_Matrix;
1276  path_matrix.Concat(*pObj2Device);
1277  if (!IsAvailableMatrix(path_matrix))
1278    return true;
1279
1280  if (FillType && (m_Options.m_Flags & RENDER_RECT_AA))
1281    FillType |= FXFILL_RECT_AA;
1282  if (m_Options.m_Flags & RENDER_FILL_FULLCOVER)
1283    FillType |= FXFILL_FULLCOVER;
1284  if (m_Options.m_Flags & RENDER_NOPATHSMOOTH)
1285    FillType |= FXFILL_NOPATHSMOOTH;
1286  if (bStroke)
1287    FillType |= FX_FILL_STROKE;
1288
1289  const CPDF_PageObject* pPageObj =
1290      static_cast<const CPDF_PageObject*>(pPathObj);
1291  if (pPageObj->m_GeneralState.GetStrokeAdjust())
1292    FillType |= FX_STROKE_ADJUST;
1293  if (m_pType3Char)
1294    FillType |= FX_FILL_TEXT_MODE;
1295
1296  CFX_GraphState graphState = pPathObj->m_GraphState;
1297  if (m_Options.m_Flags & RENDER_THINLINE)
1298    graphState.SetLineWidth(0);
1299  return m_pDevice->DrawPathWithBlend(
1300      pPathObj->m_Path.GetObject(), &path_matrix, graphState.GetObject(),
1301      fill_argb, stroke_argb, FillType, m_curBlend);
1302}
1303
1304CPDF_TransferFunc* CPDF_RenderStatus::GetTransferFunc(CPDF_Object* pObj) const {
1305  ASSERT(pObj);
1306  CPDF_DocRenderData* pDocCache = m_pContext->GetDocument()->GetRenderData();
1307  return pDocCache ? pDocCache->GetTransferFunc(pObj) : nullptr;
1308}
1309
1310FX_ARGB CPDF_RenderStatus::GetFillArgb(CPDF_PageObject* pObj,
1311                                       bool bType3) const {
1312  const CPDF_ColorState* pColorState = &pObj->m_ColorState;
1313  if (m_pType3Char && !bType3 &&
1314      (!m_pType3Char->m_bColored ||
1315       (m_pType3Char->m_bColored &&
1316        (!*pColorState || pColorState->GetFillColor()->IsNull())))) {
1317    return m_T3FillColor;
1318  }
1319  if (!*pColorState || pColorState->GetFillColor()->IsNull())
1320    pColorState = &m_InitialStates.m_ColorState;
1321
1322  FX_COLORREF rgb = pColorState->GetFillRGB();
1323  if (rgb == (uint32_t)-1)
1324    return 0;
1325
1326  int32_t alpha =
1327      static_cast<int32_t>((pObj->m_GeneralState.GetFillAlpha() * 255));
1328  if (pObj->m_GeneralState.GetTR()) {
1329    if (!pObj->m_GeneralState.GetTransferFunc()) {
1330      pObj->m_GeneralState.SetTransferFunc(
1331          GetTransferFunc(pObj->m_GeneralState.GetTR()));
1332    }
1333    if (pObj->m_GeneralState.GetTransferFunc())
1334      rgb = pObj->m_GeneralState.GetTransferFunc()->TranslateColor(rgb);
1335  }
1336  return m_Options.TranslateColor(ArgbEncode(alpha, rgb));
1337}
1338
1339FX_ARGB CPDF_RenderStatus::GetStrokeArgb(CPDF_PageObject* pObj) const {
1340  const CPDF_ColorState* pColorState = &pObj->m_ColorState;
1341  if (m_pType3Char &&
1342      (!m_pType3Char->m_bColored ||
1343       (m_pType3Char->m_bColored &&
1344        (!*pColorState || pColorState->GetStrokeColor()->IsNull())))) {
1345    return m_T3FillColor;
1346  }
1347  if (!*pColorState || pColorState->GetStrokeColor()->IsNull())
1348    pColorState = &m_InitialStates.m_ColorState;
1349
1350  FX_COLORREF rgb = pColorState->GetStrokeRGB();
1351  if (rgb == (uint32_t)-1)
1352    return 0;
1353
1354  int32_t alpha = static_cast<int32_t>(pObj->m_GeneralState.GetStrokeAlpha() *
1355                                       255);  // not rounded.
1356  if (pObj->m_GeneralState.GetTR()) {
1357    if (!pObj->m_GeneralState.GetTransferFunc()) {
1358      pObj->m_GeneralState.SetTransferFunc(
1359          GetTransferFunc(pObj->m_GeneralState.GetTR()));
1360    }
1361    if (pObj->m_GeneralState.GetTransferFunc())
1362      rgb = pObj->m_GeneralState.GetTransferFunc()->TranslateColor(rgb);
1363  }
1364  return m_Options.TranslateColor(ArgbEncode(alpha, rgb));
1365}
1366
1367void CPDF_RenderStatus::ProcessClipPath(CPDF_ClipPath ClipPath,
1368                                        const CFX_Matrix* pObj2Device) {
1369  if (!ClipPath) {
1370    if (m_LastClipPath) {
1371      m_pDevice->RestoreState(true);
1372      m_LastClipPath.SetNull();
1373    }
1374    return;
1375  }
1376  if (m_LastClipPath == ClipPath)
1377    return;
1378
1379  m_LastClipPath = ClipPath;
1380  m_pDevice->RestoreState(true);
1381  int nClipPath = ClipPath.GetPathCount();
1382  for (int i = 0; i < nClipPath; ++i) {
1383    const CFX_PathData* pPathData = ClipPath.GetPath(i).GetObject();
1384    if (!pPathData)
1385      continue;
1386
1387    if (pPathData->GetPoints().empty()) {
1388      CFX_PathData EmptyPath;
1389      EmptyPath.AppendRect(-1, -1, 0, 0);
1390      int fill_mode = FXFILL_WINDING;
1391      m_pDevice->SetClip_PathFill(&EmptyPath, nullptr, fill_mode);
1392    } else {
1393      int ClipType = ClipPath.GetClipType(i);
1394      m_pDevice->SetClip_PathFill(pPathData, pObj2Device, ClipType);
1395    }
1396  }
1397  int textcount = ClipPath.GetTextCount();
1398  if (textcount == 0)
1399    return;
1400
1401  if (m_pDevice->GetDeviceClass() == FXDC_DISPLAY &&
1402      !(m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_SOFT_CLIP)) {
1403    return;
1404  }
1405
1406  std::unique_ptr<CFX_PathData> pTextClippingPath;
1407  for (int i = 0; i < textcount; ++i) {
1408    CPDF_TextObject* pText = ClipPath.GetText(i);
1409    if (pText) {
1410      if (!pTextClippingPath)
1411        pTextClippingPath = pdfium::MakeUnique<CFX_PathData>();
1412      ProcessText(pText, pObj2Device, pTextClippingPath.get());
1413      continue;
1414    }
1415
1416    if (!pTextClippingPath)
1417      continue;
1418
1419    int fill_mode = FXFILL_WINDING;
1420    if (m_Options.m_Flags & RENDER_NOTEXTSMOOTH)
1421      fill_mode |= FXFILL_NOPATHSMOOTH;
1422    m_pDevice->SetClip_PathFill(pTextClippingPath.get(), nullptr, fill_mode);
1423    pTextClippingPath.reset();
1424  }
1425}
1426
1427bool CPDF_RenderStatus::SelectClipPath(const CPDF_PathObject* pPathObj,
1428                                       const CFX_Matrix* pObj2Device,
1429                                       bool bStroke) {
1430  CFX_Matrix path_matrix = pPathObj->m_Matrix;
1431  path_matrix.Concat(*pObj2Device);
1432  if (bStroke) {
1433    CFX_GraphState graphState = pPathObj->m_GraphState;
1434    if (m_Options.m_Flags & RENDER_THINLINE)
1435      graphState.SetLineWidth(0);
1436    return m_pDevice->SetClip_PathStroke(pPathObj->m_Path.GetObject(),
1437                                         &path_matrix, graphState.GetObject());
1438  }
1439  int fill_mode = pPathObj->m_FillType;
1440  if (m_Options.m_Flags & RENDER_NOPATHSMOOTH) {
1441    fill_mode |= FXFILL_NOPATHSMOOTH;
1442  }
1443  return m_pDevice->SetClip_PathFill(pPathObj->m_Path.GetObject(), &path_matrix,
1444                                     fill_mode);
1445}
1446
1447bool CPDF_RenderStatus::ProcessTransparency(CPDF_PageObject* pPageObj,
1448                                            const CFX_Matrix* pObj2Device) {
1449#if defined _SKIA_SUPPORT_
1450  DebugVerifyDeviceIsPreMultiplied();
1451#endif
1452  int blend_type = pPageObj->m_GeneralState.GetBlendType();
1453  if (blend_type == FXDIB_BLEND_UNSUPPORTED)
1454    return true;
1455
1456  CPDF_Dictionary* pSMaskDict =
1457      ToDictionary(pPageObj->m_GeneralState.GetSoftMask());
1458  if (pSMaskDict) {
1459    if (pPageObj->IsImage() &&
1460        pPageObj->AsImage()->GetImage()->GetDict()->KeyExist("SMask")) {
1461      pSMaskDict = nullptr;
1462    }
1463  }
1464  CPDF_Dictionary* pFormResource = nullptr;
1465  FX_FLOAT group_alpha = 1.0f;
1466  int Transparency = m_Transparency;
1467  bool bGroupTransparent = false;
1468  if (pPageObj->IsForm()) {
1469    const CPDF_FormObject* pFormObj = pPageObj->AsForm();
1470    group_alpha = pFormObj->m_GeneralState.GetFillAlpha();
1471    Transparency = pFormObj->m_pForm->m_Transparency;
1472    bGroupTransparent = !!(Transparency & PDFTRANS_ISOLATED);
1473    if (pFormObj->m_pForm->m_pFormDict) {
1474      pFormResource = pFormObj->m_pForm->m_pFormDict->GetDictFor("Resources");
1475    }
1476  }
1477  bool bTextClip =
1478      (pPageObj->m_ClipPath && pPageObj->m_ClipPath.GetTextCount() &&
1479       m_pDevice->GetDeviceClass() == FXDC_DISPLAY &&
1480       !(m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_SOFT_CLIP));
1481  if ((m_Options.m_Flags & RENDER_OVERPRINT) && pPageObj->IsImage() &&
1482      pPageObj->m_GeneralState.GetFillOP() &&
1483      pPageObj->m_GeneralState.GetStrokeOP()) {
1484    CPDF_Document* pDocument = nullptr;
1485    CPDF_Page* pPage = nullptr;
1486    if (m_pContext->GetPageCache()) {
1487      pPage = m_pContext->GetPageCache()->GetPage();
1488      pDocument = pPage->m_pDocument;
1489    } else {
1490      pDocument = pPageObj->AsImage()->GetImage()->GetDocument();
1491    }
1492    CPDF_Dictionary* pPageResources = pPage ? pPage->m_pPageResources : nullptr;
1493    CPDF_Object* pCSObj = pPageObj->AsImage()
1494                              ->GetImage()
1495                              ->GetStream()
1496                              ->GetDict()
1497                              ->GetDirectObjectFor("ColorSpace");
1498    CPDF_ColorSpace* pColorSpace =
1499        pDocument->LoadColorSpace(pCSObj, pPageResources);
1500    if (pColorSpace) {
1501      int format = pColorSpace->GetFamily();
1502      if (format == PDFCS_DEVICECMYK || format == PDFCS_SEPARATION ||
1503          format == PDFCS_DEVICEN) {
1504        blend_type = FXDIB_BLEND_DARKEN;
1505      }
1506      pDocument->GetPageData()->ReleaseColorSpace(pCSObj);
1507    }
1508  }
1509  if (!pSMaskDict && group_alpha == 1.0f && blend_type == FXDIB_BLEND_NORMAL &&
1510      !bTextClip && !bGroupTransparent) {
1511    return false;
1512  }
1513  bool isolated = !!(Transparency & PDFTRANS_ISOLATED);
1514  if (m_bPrint) {
1515    bool bRet = false;
1516    int rendCaps = m_pDevice->GetRenderCaps();
1517    if (!((Transparency & PDFTRANS_ISOLATED) || pSMaskDict || bTextClip) &&
1518        (rendCaps & FXRC_BLEND_MODE)) {
1519      int oldBlend = m_curBlend;
1520      m_curBlend = blend_type;
1521      bRet = DrawObjWithBlend(pPageObj, pObj2Device);
1522      m_curBlend = oldBlend;
1523    }
1524    if (!bRet) {
1525      DrawObjWithBackground(pPageObj, pObj2Device);
1526    }
1527    return true;
1528  }
1529  FX_RECT rect = pPageObj->GetBBox(pObj2Device);
1530  rect.Intersect(m_pDevice->GetClipBox());
1531  if (rect.IsEmpty()) {
1532    return true;
1533  }
1534  CFX_Matrix deviceCTM = m_pDevice->GetCTM();
1535  FX_FLOAT scaleX = FXSYS_fabs(deviceCTM.a);
1536  FX_FLOAT scaleY = FXSYS_fabs(deviceCTM.d);
1537  int width = FXSYS_round((FX_FLOAT)rect.Width() * scaleX);
1538  int height = FXSYS_round((FX_FLOAT)rect.Height() * scaleY);
1539  CFX_FxgeDevice bitmap_device;
1540  std::unique_ptr<CFX_DIBitmap> oriDevice;
1541  if (!isolated && (m_pDevice->GetRenderCaps() & FXRC_GET_BITS)) {
1542    oriDevice = pdfium::MakeUnique<CFX_DIBitmap>();
1543    if (!m_pDevice->CreateCompatibleBitmap(oriDevice.get(), width, height))
1544      return true;
1545    m_pDevice->GetDIBits(oriDevice.get(), rect.left, rect.top);
1546  }
1547  if (!bitmap_device.Create(width, height, FXDIB_Argb, oriDevice.get()))
1548    return true;
1549  CFX_DIBitmap* bitmap = bitmap_device.GetBitmap();
1550  bitmap->Clear(0);
1551  CFX_Matrix new_matrix = *pObj2Device;
1552  new_matrix.Translate(-rect.left, -rect.top);
1553  new_matrix.Scale(scaleX, scaleY);
1554  std::unique_ptr<CFX_DIBitmap> pTextMask;
1555  if (bTextClip) {
1556    pTextMask = pdfium::MakeUnique<CFX_DIBitmap>();
1557    if (!pTextMask->Create(width, height, FXDIB_8bppMask))
1558      return true;
1559
1560    pTextMask->Clear(0);
1561    CFX_FxgeDevice text_device;
1562    text_device.Attach(pTextMask.get(), false, nullptr, false);
1563    for (uint32_t i = 0; i < pPageObj->m_ClipPath.GetTextCount(); i++) {
1564      CPDF_TextObject* textobj = pPageObj->m_ClipPath.GetText(i);
1565      if (!textobj)
1566        break;
1567
1568      CFX_Matrix text_matrix = textobj->GetTextMatrix();
1569      CPDF_TextRenderer::DrawTextPath(
1570          &text_device, textobj->m_CharCodes, textobj->m_CharPos,
1571          textobj->m_TextState.GetFont(), textobj->m_TextState.GetFontSize(),
1572          &text_matrix, &new_matrix, textobj->m_GraphState.GetObject(),
1573          (FX_ARGB)-1, 0, nullptr, 0);
1574    }
1575  }
1576  CPDF_RenderStatus bitmap_render;
1577  bitmap_render.Initialize(m_pContext, &bitmap_device, nullptr, m_pStopObj,
1578                           nullptr, nullptr, &m_Options, 0, m_bDropObjects,
1579                           pFormResource, true);
1580  bitmap_render.ProcessObjectNoClip(pPageObj, &new_matrix);
1581#if defined _SKIA_SUPPORT_PATHS_
1582  bitmap_device.Flush();
1583  bitmap->UnPreMultiply();
1584#endif
1585  m_bStopped = bitmap_render.m_bStopped;
1586  if (pSMaskDict) {
1587    CFX_Matrix smask_matrix = *pPageObj->m_GeneralState.GetSMaskMatrix();
1588    smask_matrix.Concat(*pObj2Device);
1589    std::unique_ptr<CFX_DIBSource> pSMaskSource =
1590        LoadSMask(pSMaskDict, &rect, &smask_matrix);
1591    if (pSMaskSource)
1592      bitmap->MultiplyAlpha(pSMaskSource.get());
1593  }
1594  if (pTextMask) {
1595    bitmap->MultiplyAlpha(pTextMask.get());
1596    pTextMask.reset();
1597  }
1598  int32_t blitAlpha = 255;
1599  if (Transparency & PDFTRANS_GROUP && group_alpha != 1.0f) {
1600    blitAlpha = (int32_t)(group_alpha * 255);
1601#ifndef _SKIA_SUPPORT_
1602    bitmap->MultiplyAlpha(blitAlpha);
1603    blitAlpha = 255;
1604#endif
1605  }
1606  Transparency = m_Transparency;
1607  if (pPageObj->IsForm()) {
1608    Transparency |= PDFTRANS_GROUP;
1609  }
1610  CompositeDIBitmap(bitmap, rect.left, rect.top, 0, blitAlpha, blend_type,
1611                    Transparency);
1612#if defined _SKIA_SUPPORT_
1613  DebugVerifyDeviceIsPreMultiplied();
1614#endif
1615  return true;
1616}
1617
1618std::unique_ptr<CFX_DIBitmap> CPDF_RenderStatus::GetBackdrop(
1619    const CPDF_PageObject* pObj,
1620    const FX_RECT& rect,
1621    int& left,
1622    int& top,
1623    bool bBackAlphaRequired) {
1624  FX_RECT bbox = rect;
1625  bbox.Intersect(m_pDevice->GetClipBox());
1626  left = bbox.left;
1627  top = bbox.top;
1628  CFX_Matrix deviceCTM = m_pDevice->GetCTM();
1629  FX_FLOAT scaleX = FXSYS_fabs(deviceCTM.a);
1630  FX_FLOAT scaleY = FXSYS_fabs(deviceCTM.d);
1631  int width = FXSYS_round(bbox.Width() * scaleX);
1632  int height = FXSYS_round(bbox.Height() * scaleY);
1633  auto pBackdrop = pdfium::MakeUnique<CFX_DIBitmap>();
1634  if (bBackAlphaRequired && !m_bDropObjects)
1635    pBackdrop->Create(width, height, FXDIB_Argb);
1636  else
1637    m_pDevice->CreateCompatibleBitmap(pBackdrop.get(), width, height);
1638
1639  if (!pBackdrop->GetBuffer())
1640    return nullptr;
1641
1642  bool bNeedDraw;
1643  if (pBackdrop->HasAlpha())
1644    bNeedDraw = !(m_pDevice->GetRenderCaps() & FXRC_ALPHA_OUTPUT);
1645  else
1646    bNeedDraw = !(m_pDevice->GetRenderCaps() & FXRC_GET_BITS);
1647
1648  if (!bNeedDraw) {
1649    m_pDevice->GetDIBits(pBackdrop.get(), left, top);
1650    return pBackdrop;
1651  }
1652
1653  CFX_Matrix FinalMatrix = m_DeviceMatrix;
1654  FinalMatrix.Translate(-left, -top);
1655  FinalMatrix.Scale(scaleX, scaleY);
1656  pBackdrop->Clear(pBackdrop->HasAlpha() ? 0 : 0xffffffff);
1657  CFX_FxgeDevice device;
1658  device.Attach(pBackdrop.get(), false, nullptr, false);
1659  m_pContext->Render(&device, pObj, &m_Options, &FinalMatrix);
1660  return pBackdrop;
1661}
1662
1663CPDF_GraphicStates* CPDF_RenderStatus::CloneObjStates(
1664    const CPDF_GraphicStates* pSrcStates,
1665    bool bStroke) {
1666  if (!pSrcStates)
1667    return nullptr;
1668
1669  CPDF_GraphicStates* pStates = new CPDF_GraphicStates;
1670  pStates->CopyStates(*pSrcStates);
1671  const CPDF_Color* pObjColor = bStroke
1672                                    ? pSrcStates->m_ColorState.GetStrokeColor()
1673                                    : pSrcStates->m_ColorState.GetFillColor();
1674  if (!pObjColor->IsNull()) {
1675    pStates->m_ColorState.SetFillRGB(
1676        bStroke ? pSrcStates->m_ColorState.GetStrokeRGB()
1677                : pSrcStates->m_ColorState.GetFillRGB());
1678    pStates->m_ColorState.SetStrokeRGB(pStates->m_ColorState.GetFillRGB());
1679  }
1680  return pStates;
1681}
1682
1683#if defined _SKIA_SUPPORT_
1684void CPDF_RenderStatus::DebugVerifyDeviceIsPreMultiplied() const {
1685  m_pDevice->DebugVerifyBitmapIsPreMultiplied();
1686}
1687#endif
1688
1689bool CPDF_RenderStatus::ProcessText(CPDF_TextObject* textobj,
1690                                    const CFX_Matrix* pObj2Device,
1691                                    CFX_PathData* pClippingPath) {
1692  if (textobj->m_CharCodes.empty())
1693    return true;
1694
1695  const TextRenderingMode text_render_mode = textobj->m_TextState.GetTextMode();
1696  if (text_render_mode == TextRenderingMode::MODE_INVISIBLE)
1697    return true;
1698
1699  CPDF_Font* pFont = textobj->m_TextState.GetFont();
1700  if (pFont->IsType3Font())
1701    return ProcessType3Text(textobj, pObj2Device);
1702
1703  bool bFill = false;
1704  bool bStroke = false;
1705  bool bClip = false;
1706  if (pClippingPath) {
1707    bClip = true;
1708  } else {
1709    switch (text_render_mode) {
1710      case TextRenderingMode::MODE_FILL:
1711      case TextRenderingMode::MODE_FILL_CLIP:
1712        bFill = true;
1713        break;
1714      case TextRenderingMode::MODE_STROKE:
1715      case TextRenderingMode::MODE_STROKE_CLIP:
1716        if (pFont->GetFace())
1717          bStroke = true;
1718        else
1719          bFill = true;
1720        break;
1721      case TextRenderingMode::MODE_FILL_STROKE:
1722      case TextRenderingMode::MODE_FILL_STROKE_CLIP:
1723        bFill = true;
1724        if (pFont->GetFace())
1725          bStroke = true;
1726        break;
1727      case TextRenderingMode::MODE_INVISIBLE:
1728        // Already handled above, but the compiler is not smart enough to
1729        // realize it. Fall through.
1730        ASSERT(false);
1731      case TextRenderingMode::MODE_CLIP:
1732        return true;
1733    }
1734  }
1735  FX_ARGB stroke_argb = 0;
1736  FX_ARGB fill_argb = 0;
1737  bool bPattern = false;
1738  if (bStroke) {
1739    if (textobj->m_ColorState.GetStrokeColor()->IsPattern()) {
1740      bPattern = true;
1741    } else {
1742      stroke_argb = GetStrokeArgb(textobj);
1743    }
1744  }
1745  if (bFill) {
1746    if (textobj->m_ColorState.GetFillColor()->IsPattern()) {
1747      bPattern = true;
1748    } else {
1749      fill_argb = GetFillArgb(textobj);
1750    }
1751  }
1752  CFX_Matrix text_matrix = textobj->GetTextMatrix();
1753  if (!IsAvailableMatrix(text_matrix))
1754    return true;
1755
1756  FX_FLOAT font_size = textobj->m_TextState.GetFontSize();
1757  if (bPattern) {
1758    DrawTextPathWithPattern(textobj, pObj2Device, pFont, font_size,
1759                            &text_matrix, bFill, bStroke);
1760    return true;
1761  }
1762  if (bClip || bStroke) {
1763    const CFX_Matrix* pDeviceMatrix = pObj2Device;
1764    CFX_Matrix device_matrix;
1765    if (bStroke) {
1766      const FX_FLOAT* pCTM = textobj->m_TextState.GetCTM();
1767      if (pCTM[0] != 1.0f || pCTM[3] != 1.0f) {
1768        CFX_Matrix ctm(pCTM[0], pCTM[1], pCTM[2], pCTM[3], 0, 0);
1769        text_matrix.ConcatInverse(ctm);
1770        device_matrix = ctm;
1771        device_matrix.Concat(*pObj2Device);
1772        pDeviceMatrix = &device_matrix;
1773      }
1774    }
1775    int flag = 0;
1776    if (bStroke && bFill) {
1777      flag |= FX_FILL_STROKE;
1778      flag |= FX_STROKE_TEXT_MODE;
1779    }
1780    if (textobj->m_GeneralState.GetStrokeAdjust())
1781      flag |= FX_STROKE_ADJUST;
1782    if (m_Options.m_Flags & RENDER_NOTEXTSMOOTH)
1783      flag |= FXFILL_NOPATHSMOOTH;
1784    return CPDF_TextRenderer::DrawTextPath(
1785        m_pDevice, textobj->m_CharCodes, textobj->m_CharPos, pFont, font_size,
1786        &text_matrix, pDeviceMatrix, textobj->m_GraphState.GetObject(),
1787        fill_argb, stroke_argb, pClippingPath, flag);
1788  }
1789  text_matrix.Concat(*pObj2Device);
1790  return CPDF_TextRenderer::DrawNormalText(m_pDevice, textobj->m_CharCodes,
1791                                           textobj->m_CharPos, pFont, font_size,
1792                                           &text_matrix, fill_argb, &m_Options);
1793}
1794
1795CPDF_Type3Cache* CPDF_RenderStatus::GetCachedType3(CPDF_Type3Font* pFont) {
1796  if (!pFont->m_pDocument) {
1797    return nullptr;
1798  }
1799  pFont->m_pDocument->GetPageData()->GetFont(pFont->GetFontDict());
1800  return pFont->m_pDocument->GetRenderData()->GetCachedType3(pFont);
1801}
1802
1803// TODO(npm): Font fallback for type 3 fonts? (Completely separate code!!)
1804bool CPDF_RenderStatus::ProcessType3Text(CPDF_TextObject* textobj,
1805                                         const CFX_Matrix* pObj2Device) {
1806  CPDF_Type3Font* pType3Font = textobj->m_TextState.GetFont()->AsType3Font();
1807  if (pdfium::ContainsValue(m_Type3FontCache, pType3Font))
1808    return true;
1809
1810  CFX_Matrix dCTM = m_pDevice->GetCTM();
1811  FX_FLOAT sa = FXSYS_fabs(dCTM.a);
1812  FX_FLOAT sd = FXSYS_fabs(dCTM.d);
1813  CFX_Matrix text_matrix = textobj->GetTextMatrix();
1814  CFX_Matrix char_matrix = pType3Font->GetFontMatrix();
1815  FX_FLOAT font_size = textobj->m_TextState.GetFontSize();
1816  char_matrix.Scale(font_size, font_size);
1817  FX_ARGB fill_argb = GetFillArgb(textobj, true);
1818  int fill_alpha = FXARGB_A(fill_argb);
1819  int device_class = m_pDevice->GetDeviceClass();
1820  std::vector<FXTEXT_GLYPHPOS> glyphs;
1821  if (device_class == FXDC_DISPLAY)
1822    glyphs.resize(textobj->m_CharCodes.size());
1823  else if (fill_alpha < 255)
1824    return false;
1825
1826  CPDF_RefType3Cache refTypeCache(pType3Font);
1827  for (int iChar = 0; iChar < pdfium::CollectionSize<int>(textobj->m_CharCodes);
1828       iChar++) {
1829    uint32_t charcode = textobj->m_CharCodes[iChar];
1830    if (charcode == static_cast<uint32_t>(-1))
1831      continue;
1832
1833    CPDF_Type3Char* pType3Char = pType3Font->LoadChar(charcode);
1834    if (!pType3Char)
1835      continue;
1836
1837    CFX_Matrix matrix = char_matrix;
1838    matrix.e += iChar ? textobj->m_CharPos[iChar - 1] : 0;
1839    matrix.Concat(text_matrix);
1840    matrix.Concat(*pObj2Device);
1841    if (!pType3Char->LoadBitmap(m_pContext)) {
1842      if (!glyphs.empty()) {
1843        for (int i = 0; i < iChar; i++) {
1844          const FXTEXT_GLYPHPOS& glyph = glyphs[i];
1845          if (!glyph.m_pGlyph)
1846            continue;
1847
1848          m_pDevice->SetBitMask(&glyph.m_pGlyph->m_Bitmap,
1849                                glyph.m_Origin.x + glyph.m_pGlyph->m_Left,
1850                                glyph.m_Origin.y - glyph.m_pGlyph->m_Top,
1851                                fill_argb);
1852        }
1853        glyphs.clear();
1854      }
1855      CPDF_GraphicStates* pStates = CloneObjStates(textobj, false);
1856      CPDF_RenderOptions Options = m_Options;
1857      Options.m_Flags |= RENDER_FORCE_HALFTONE | RENDER_RECT_AA;
1858      Options.m_Flags &= ~RENDER_FORCE_DOWNSAMPLE;
1859      CPDF_Dictionary* pFormResource = nullptr;
1860      if (pType3Char->m_pForm && pType3Char->m_pForm->m_pFormDict) {
1861        pFormResource =
1862            pType3Char->m_pForm->m_pFormDict->GetDictFor("Resources");
1863      }
1864      if (fill_alpha == 255) {
1865        CPDF_RenderStatus status;
1866        status.Initialize(m_pContext, m_pDevice, nullptr, nullptr, this,
1867                          pStates, &Options,
1868                          pType3Char->m_pForm->m_Transparency, m_bDropObjects,
1869                          pFormResource, false, pType3Char, fill_argb);
1870        status.m_Type3FontCache = m_Type3FontCache;
1871        status.m_Type3FontCache.push_back(pType3Font);
1872        m_pDevice->SaveState();
1873        status.RenderObjectList(pType3Char->m_pForm.get(), &matrix);
1874        m_pDevice->RestoreState(false);
1875      } else {
1876        CFX_FloatRect rect_f = pType3Char->m_pForm->CalcBoundingBox();
1877        matrix.TransformRect(rect_f);
1878
1879        FX_RECT rect = rect_f.GetOuterRect();
1880        CFX_FxgeDevice bitmap_device;
1881        if (!bitmap_device.Create((int)(rect.Width() * sa),
1882                                  (int)(rect.Height() * sd), FXDIB_Argb,
1883                                  nullptr)) {
1884          return true;
1885        }
1886        bitmap_device.GetBitmap()->Clear(0);
1887        CPDF_RenderStatus status;
1888        status.Initialize(m_pContext, &bitmap_device, nullptr, nullptr, this,
1889                          pStates, &Options,
1890                          pType3Char->m_pForm->m_Transparency, m_bDropObjects,
1891                          pFormResource, false, pType3Char, fill_argb);
1892        status.m_Type3FontCache = m_Type3FontCache;
1893        status.m_Type3FontCache.push_back(pType3Font);
1894        matrix.Translate(-rect.left, -rect.top);
1895        matrix.Scale(sa, sd);
1896        status.RenderObjectList(pType3Char->m_pForm.get(), &matrix);
1897        m_pDevice->SetDIBits(bitmap_device.GetBitmap(), rect.left, rect.top);
1898      }
1899      delete pStates;
1900    } else if (pType3Char->m_pBitmap) {
1901      if (device_class == FXDC_DISPLAY) {
1902        CPDF_Type3Cache* pCache = GetCachedType3(pType3Font);
1903        refTypeCache.m_dwCount++;
1904        CFX_GlyphBitmap* pBitmap = pCache->LoadGlyph(charcode, &matrix, sa, sd);
1905        if (!pBitmap)
1906          continue;
1907
1908        CFX_Point origin(FXSYS_round(matrix.e), FXSYS_round(matrix.f));
1909        if (glyphs.empty()) {
1910          m_pDevice->SetBitMask(&pBitmap->m_Bitmap, origin.x + pBitmap->m_Left,
1911                                origin.y - pBitmap->m_Top, fill_argb);
1912        } else {
1913          glyphs[iChar].m_pGlyph = pBitmap;
1914          glyphs[iChar].m_Origin = origin;
1915        }
1916      } else {
1917        CFX_Matrix image_matrix = pType3Char->m_ImageMatrix;
1918        image_matrix.Concat(matrix);
1919        CPDF_ImageRenderer renderer;
1920        if (renderer.Start(this, pType3Char->m_pBitmap.get(), fill_argb, 255,
1921                           &image_matrix, 0, false, FXDIB_BLEND_NORMAL)) {
1922          renderer.Continue(nullptr);
1923        }
1924        if (!renderer.GetResult())
1925          return false;
1926      }
1927    }
1928  }
1929
1930  if (glyphs.empty())
1931    return true;
1932
1933  FX_RECT rect = FXGE_GetGlyphsBBox(glyphs, 0, sa, sd);
1934  CFX_DIBitmap bitmap;
1935  if (!bitmap.Create(static_cast<int>(rect.Width() * sa),
1936                     static_cast<int>(rect.Height() * sd), FXDIB_8bppMask)) {
1937    return true;
1938  }
1939  bitmap.Clear(0);
1940  for (const FXTEXT_GLYPHPOS& glyph : glyphs) {
1941    if (!glyph.m_pGlyph)
1942      continue;
1943
1944    pdfium::base::CheckedNumeric<int> left = glyph.m_Origin.x;
1945    left += glyph.m_pGlyph->m_Left;
1946    left -= rect.left;
1947    left *= sa;
1948    if (!left.IsValid())
1949      continue;
1950
1951    pdfium::base::CheckedNumeric<int> top = glyph.m_Origin.y;
1952    top -= glyph.m_pGlyph->m_Top;
1953    top -= rect.top;
1954    top *= sd;
1955    if (!top.IsValid())
1956      continue;
1957
1958    bitmap.CompositeMask(left.ValueOrDie(), top.ValueOrDie(),
1959                         glyph.m_pGlyph->m_Bitmap.GetWidth(),
1960                         glyph.m_pGlyph->m_Bitmap.GetHeight(),
1961                         &glyph.m_pGlyph->m_Bitmap, fill_argb, 0, 0,
1962                         FXDIB_BLEND_NORMAL, nullptr, false, 0, nullptr);
1963  }
1964  m_pDevice->SetBitMask(&bitmap, rect.left, rect.top, fill_argb);
1965  return true;
1966}
1967
1968void CPDF_RenderStatus::DrawTextPathWithPattern(const CPDF_TextObject* textobj,
1969                                                const CFX_Matrix* pObj2Device,
1970                                                CPDF_Font* pFont,
1971                                                FX_FLOAT font_size,
1972                                                const CFX_Matrix* pTextMatrix,
1973                                                bool bFill,
1974                                                bool bStroke) {
1975  if (!bStroke) {
1976    CPDF_PathObject path;
1977    std::vector<std::unique_ptr<CPDF_TextObject>> pCopy;
1978    pCopy.push_back(std::unique_ptr<CPDF_TextObject>(textobj->Clone()));
1979    path.m_bStroke = false;
1980    path.m_FillType = FXFILL_WINDING;
1981    path.m_ClipPath.AppendTexts(&pCopy);
1982    path.m_ColorState = textobj->m_ColorState;
1983    path.m_Path.AppendRect(textobj->m_Left, textobj->m_Bottom, textobj->m_Right,
1984                           textobj->m_Top);
1985    path.m_Left = textobj->m_Left;
1986    path.m_Bottom = textobj->m_Bottom;
1987    path.m_Right = textobj->m_Right;
1988    path.m_Top = textobj->m_Top;
1989    RenderSingleObject(&path, pObj2Device);
1990    return;
1991  }
1992  CPDF_CharPosList CharPosList;
1993  CharPosList.Load(textobj->m_CharCodes, textobj->m_CharPos, pFont, font_size);
1994  for (uint32_t i = 0; i < CharPosList.m_nChars; i++) {
1995    FXTEXT_CHARPOS& charpos = CharPosList.m_pCharPos[i];
1996    auto font =
1997        charpos.m_FallbackFontPosition == -1
1998            ? &pFont->m_Font
1999            : pFont->m_FontFallbacks[charpos.m_FallbackFontPosition].get();
2000    const CFX_PathData* pPath =
2001        font->LoadGlyphPath(charpos.m_GlyphIndex, charpos.m_FontCharWidth);
2002    if (!pPath)
2003      continue;
2004
2005    CPDF_PathObject path;
2006    path.m_GraphState = textobj->m_GraphState;
2007    path.m_ColorState = textobj->m_ColorState;
2008
2009    CFX_Matrix matrix;
2010    if (charpos.m_bGlyphAdjust) {
2011      matrix = CFX_Matrix(charpos.m_AdjustMatrix[0], charpos.m_AdjustMatrix[1],
2012                          charpos.m_AdjustMatrix[2], charpos.m_AdjustMatrix[3],
2013                          0, 0);
2014    }
2015    matrix.Concat(CFX_Matrix(font_size, 0, 0, font_size, charpos.m_Origin.x,
2016                             charpos.m_Origin.y));
2017    path.m_Path.Append(pPath, &matrix);
2018    path.m_Matrix = *pTextMatrix;
2019    path.m_bStroke = bStroke;
2020    path.m_FillType = bFill ? FXFILL_WINDING : 0;
2021    path.CalcBoundingBox();
2022    ProcessPath(&path, pObj2Device);
2023  }
2024}
2025
2026void CPDF_RenderStatus::DrawShading(CPDF_ShadingPattern* pPattern,
2027                                    CFX_Matrix* pMatrix,
2028                                    FX_RECT& clip_rect,
2029                                    int alpha,
2030                                    bool bAlphaMode) {
2031  const auto& funcs = pPattern->GetFuncs();
2032  CPDF_Dictionary* pDict = pPattern->GetShadingObject()->GetDict();
2033  CPDF_ColorSpace* pColorSpace = pPattern->GetCS();
2034  if (!pColorSpace)
2035    return;
2036
2037  FX_ARGB background = 0;
2038  if (!pPattern->IsShadingObject() && pDict->KeyExist("Background")) {
2039    CPDF_Array* pBackColor = pDict->GetArrayFor("Background");
2040    if (pBackColor &&
2041        pBackColor->GetCount() >= pColorSpace->CountComponents()) {
2042      CFX_FixedBufGrow<FX_FLOAT, 16> comps(pColorSpace->CountComponents());
2043      for (uint32_t i = 0; i < pColorSpace->CountComponents(); i++)
2044        comps[i] = pBackColor->GetNumberAt(i);
2045      FX_FLOAT R = 0.0f, G = 0.0f, B = 0.0f;
2046      pColorSpace->GetRGB(comps, R, G, B);
2047      background = ArgbEncode(255, (int32_t)(R * 255), (int32_t)(G * 255),
2048                              (int32_t)(B * 255));
2049    }
2050  }
2051  if (pDict->KeyExist("BBox")) {
2052    CFX_FloatRect rect = pDict->GetRectFor("BBox");
2053    pMatrix->TransformRect(rect);
2054    clip_rect.Intersect(rect.GetOuterRect());
2055  }
2056  if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_SHADING &&
2057      m_pDevice->GetDeviceDriver()->DrawShading(pPattern, pMatrix, clip_rect,
2058                                                alpha, bAlphaMode)) {
2059    return;
2060  }
2061  CPDF_DeviceBuffer buffer;
2062  buffer.Initialize(m_pContext, m_pDevice, &clip_rect, m_pCurObj, 150);
2063  CFX_Matrix FinalMatrix = *pMatrix;
2064  FinalMatrix.Concat(*buffer.GetMatrix());
2065  CFX_DIBitmap* pBitmap = buffer.GetBitmap();
2066  if (!pBitmap->GetBuffer())
2067    return;
2068
2069  pBitmap->Clear(background);
2070  int fill_mode = m_Options.m_Flags;
2071  switch (pPattern->GetShadingType()) {
2072    case kInvalidShading:
2073    case kMaxShading:
2074      return;
2075    case kFunctionBasedShading:
2076      DrawFuncShading(pBitmap, &FinalMatrix, pDict, funcs, pColorSpace, alpha);
2077      break;
2078    case kAxialShading:
2079      DrawAxialShading(pBitmap, &FinalMatrix, pDict, funcs, pColorSpace, alpha);
2080      break;
2081    case kRadialShading:
2082      DrawRadialShading(pBitmap, &FinalMatrix, pDict, funcs, pColorSpace,
2083                        alpha);
2084      break;
2085    case kFreeFormGouraudTriangleMeshShading: {
2086      // The shading object can be a stream or a dictionary. We do not handle
2087      // the case of dictionary at the moment.
2088      if (CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
2089        DrawFreeGouraudShading(pBitmap, &FinalMatrix, pStream, funcs,
2090                               pColorSpace, alpha);
2091      }
2092    } break;
2093    case kLatticeFormGouraudTriangleMeshShading: {
2094      // The shading object can be a stream or a dictionary. We do not handle
2095      // the case of dictionary at the moment.
2096      if (CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
2097        DrawLatticeGouraudShading(pBitmap, &FinalMatrix, pStream, funcs,
2098                                  pColorSpace, alpha);
2099      }
2100    } break;
2101    case kCoonsPatchMeshShading:
2102    case kTensorProductPatchMeshShading: {
2103      // The shading object can be a stream or a dictionary. We do not handle
2104      // the case of dictionary at the moment.
2105      if (CPDF_Stream* pStream = ToStream(pPattern->GetShadingObject())) {
2106        DrawCoonPatchMeshes(pPattern->GetShadingType(), pBitmap, &FinalMatrix,
2107                            pStream, funcs, pColorSpace, fill_mode, alpha);
2108      }
2109    } break;
2110  }
2111  if (bAlphaMode)
2112    pBitmap->LoadChannel(FXDIB_Red, pBitmap, FXDIB_Alpha);
2113
2114  if (m_Options.m_ColorMode == RENDER_COLOR_GRAY)
2115    pBitmap->ConvertColorScale(m_Options.m_ForeColor, m_Options.m_BackColor);
2116  buffer.OutputToDevice();
2117}
2118
2119void CPDF_RenderStatus::DrawShadingPattern(CPDF_ShadingPattern* pattern,
2120                                           const CPDF_PageObject* pPageObj,
2121                                           const CFX_Matrix* pObj2Device,
2122                                           bool bStroke) {
2123  if (!pattern->Load())
2124    return;
2125
2126  m_pDevice->SaveState();
2127  if (pPageObj->IsPath()) {
2128    if (!SelectClipPath(pPageObj->AsPath(), pObj2Device, bStroke)) {
2129      m_pDevice->RestoreState(false);
2130      return;
2131    }
2132  } else if (pPageObj->IsImage()) {
2133    m_pDevice->SetClip_Rect(pPageObj->GetBBox(pObj2Device));
2134  } else {
2135    return;
2136  }
2137  FX_RECT rect;
2138  if (GetObjectClippedRect(pPageObj, pObj2Device, false, rect)) {
2139    m_pDevice->RestoreState(false);
2140    return;
2141  }
2142  CFX_Matrix matrix = *pattern->pattern_to_form();
2143  matrix.Concat(*pObj2Device);
2144  GetScaledMatrix(matrix);
2145  int alpha =
2146      FXSYS_round(255 * (bStroke ? pPageObj->m_GeneralState.GetStrokeAlpha()
2147                                 : pPageObj->m_GeneralState.GetFillAlpha()));
2148  DrawShading(pattern, &matrix, rect, alpha,
2149              m_Options.m_ColorMode == RENDER_COLOR_ALPHA);
2150  m_pDevice->RestoreState(false);
2151}
2152
2153void CPDF_RenderStatus::ProcessShading(const CPDF_ShadingObject* pShadingObj,
2154                                       const CFX_Matrix* pObj2Device) {
2155  FX_RECT rect = pShadingObj->GetBBox(pObj2Device);
2156  FX_RECT clip_box = m_pDevice->GetClipBox();
2157  rect.Intersect(clip_box);
2158  if (rect.IsEmpty())
2159    return;
2160
2161  CFX_Matrix matrix = pShadingObj->m_Matrix;
2162  matrix.Concat(*pObj2Device);
2163  DrawShading(pShadingObj->m_pShading, &matrix, rect,
2164              FXSYS_round(255 * pShadingObj->m_GeneralState.GetFillAlpha()),
2165              m_Options.m_ColorMode == RENDER_COLOR_ALPHA);
2166}
2167
2168void CPDF_RenderStatus::DrawTilingPattern(CPDF_TilingPattern* pPattern,
2169                                          CPDF_PageObject* pPageObj,
2170                                          const CFX_Matrix* pObj2Device,
2171                                          bool bStroke) {
2172  if (!pPattern->Load()) {
2173    return;
2174  }
2175  m_pDevice->SaveState();
2176  if (pPageObj->IsPath()) {
2177    if (!SelectClipPath(pPageObj->AsPath(), pObj2Device, bStroke)) {
2178      m_pDevice->RestoreState(false);
2179      return;
2180    }
2181  } else if (pPageObj->IsImage()) {
2182    m_pDevice->SetClip_Rect(pPageObj->GetBBox(pObj2Device));
2183  } else {
2184    return;
2185  }
2186  FX_RECT clip_box = m_pDevice->GetClipBox();
2187  if (clip_box.IsEmpty()) {
2188    m_pDevice->RestoreState(false);
2189    return;
2190  }
2191  CFX_Matrix dCTM = m_pDevice->GetCTM();
2192  FX_FLOAT sa = FXSYS_fabs(dCTM.a);
2193  FX_FLOAT sd = FXSYS_fabs(dCTM.d);
2194  clip_box.right = clip_box.left + (int32_t)FXSYS_ceil(clip_box.Width() * sa);
2195  clip_box.bottom = clip_box.top + (int32_t)FXSYS_ceil(clip_box.Height() * sd);
2196  CFX_Matrix mtPattern2Device = *pPattern->pattern_to_form();
2197  mtPattern2Device.Concat(*pObj2Device);
2198  GetScaledMatrix(mtPattern2Device);
2199  bool bAligned = false;
2200  if (pPattern->bbox().left == 0 && pPattern->bbox().bottom == 0 &&
2201      pPattern->bbox().right == pPattern->x_step() &&
2202      pPattern->bbox().top == pPattern->y_step() &&
2203      (mtPattern2Device.IsScaled() || mtPattern2Device.Is90Rotated())) {
2204    bAligned = true;
2205  }
2206  CFX_FloatRect cell_bbox = pPattern->bbox();
2207  mtPattern2Device.TransformRect(cell_bbox);
2208  int width = (int)FXSYS_ceil(cell_bbox.Width());
2209  int height = (int)FXSYS_ceil(cell_bbox.Height());
2210  if (width == 0) {
2211    width = 1;
2212  }
2213  if (height == 0) {
2214    height = 1;
2215  }
2216  int min_col, max_col, min_row, max_row;
2217  CFX_Matrix mtDevice2Pattern;
2218  mtDevice2Pattern.SetReverse(mtPattern2Device);
2219
2220  CFX_FloatRect clip_box_p(clip_box);
2221  mtDevice2Pattern.TransformRect(clip_box_p);
2222
2223  min_col = (int)FXSYS_ceil((clip_box_p.left - pPattern->bbox().right) /
2224                            pPattern->x_step());
2225  max_col = (int)FXSYS_floor((clip_box_p.right - pPattern->bbox().left) /
2226                             pPattern->x_step());
2227  min_row = (int)FXSYS_ceil((clip_box_p.bottom - pPattern->bbox().top) /
2228                            pPattern->y_step());
2229  max_row = (int)FXSYS_floor((clip_box_p.top - pPattern->bbox().bottom) /
2230                             pPattern->y_step());
2231
2232  if (width > clip_box.Width() || height > clip_box.Height() ||
2233      width * height > clip_box.Width() * clip_box.Height()) {
2234    CPDF_GraphicStates* pStates = nullptr;
2235    if (!pPattern->colored())
2236      pStates = CloneObjStates(pPageObj, bStroke);
2237
2238    CPDF_Dictionary* pFormResource = nullptr;
2239    if (pPattern->form()->m_pFormDict)
2240      pFormResource = pPattern->form()->m_pFormDict->GetDictFor("Resources");
2241
2242    for (int col = min_col; col <= max_col; col++)
2243      for (int row = min_row; row <= max_row; row++) {
2244        CFX_PointF original = mtPattern2Device.Transform(
2245            CFX_PointF(col * pPattern->x_step(), row * pPattern->y_step()));
2246        CFX_Matrix matrix = *pObj2Device;
2247        matrix.Translate(original.x - mtPattern2Device.e,
2248                         original.y - mtPattern2Device.f);
2249        m_pDevice->SaveState();
2250        CPDF_RenderStatus status;
2251        status.Initialize(m_pContext, m_pDevice, nullptr, nullptr, this,
2252                          pStates, &m_Options, pPattern->form()->m_Transparency,
2253                          m_bDropObjects, pFormResource);
2254        status.RenderObjectList(pPattern->form(), &matrix);
2255        m_pDevice->RestoreState(false);
2256      }
2257    m_pDevice->RestoreState(false);
2258    delete pStates;
2259    return;
2260  }
2261  if (bAligned) {
2262    int orig_x = FXSYS_round(mtPattern2Device.e);
2263    int orig_y = FXSYS_round(mtPattern2Device.f);
2264    min_col = (clip_box.left - orig_x) / width;
2265    if (clip_box.left < orig_x) {
2266      min_col--;
2267    }
2268    max_col = (clip_box.right - orig_x) / width;
2269    if (clip_box.right <= orig_x) {
2270      max_col--;
2271    }
2272    min_row = (clip_box.top - orig_y) / height;
2273    if (clip_box.top < orig_y) {
2274      min_row--;
2275    }
2276    max_row = (clip_box.bottom - orig_y) / height;
2277    if (clip_box.bottom <= orig_y) {
2278      max_row--;
2279    }
2280  }
2281  FX_FLOAT left_offset = cell_bbox.left - mtPattern2Device.e;
2282  FX_FLOAT top_offset = cell_bbox.bottom - mtPattern2Device.f;
2283  std::unique_ptr<CFX_DIBitmap> pPatternBitmap;
2284  if (width * height < 16) {
2285    std::unique_ptr<CFX_DIBitmap> pEnlargedBitmap =
2286        DrawPatternBitmap(m_pContext->GetDocument(), m_pContext->GetPageCache(),
2287                          pPattern, pObj2Device, 8, 8, m_Options.m_Flags);
2288    pPatternBitmap = pEnlargedBitmap->StretchTo(width, height);
2289  } else {
2290    pPatternBitmap = DrawPatternBitmap(
2291        m_pContext->GetDocument(), m_pContext->GetPageCache(), pPattern,
2292        pObj2Device, width, height, m_Options.m_Flags);
2293  }
2294  if (!pPatternBitmap) {
2295    m_pDevice->RestoreState(false);
2296    return;
2297  }
2298  if (m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
2299    pPatternBitmap->ConvertColorScale(m_Options.m_ForeColor,
2300                                      m_Options.m_BackColor);
2301  }
2302  FX_ARGB fill_argb = GetFillArgb(pPageObj);
2303  int clip_width = clip_box.right - clip_box.left;
2304  int clip_height = clip_box.bottom - clip_box.top;
2305  CFX_DIBitmap screen;
2306  if (!screen.Create(clip_width, clip_height, FXDIB_Argb)) {
2307    return;
2308  }
2309  screen.Clear(0);
2310  uint32_t* src_buf = (uint32_t*)pPatternBitmap->GetBuffer();
2311  for (int col = min_col; col <= max_col; col++) {
2312    for (int row = min_row; row <= max_row; row++) {
2313      int start_x, start_y;
2314      if (bAligned) {
2315        start_x = FXSYS_round(mtPattern2Device.e) + col * width - clip_box.left;
2316        start_y = FXSYS_round(mtPattern2Device.f) + row * height - clip_box.top;
2317      } else {
2318        CFX_PointF original = mtPattern2Device.Transform(
2319            CFX_PointF(col * pPattern->x_step(), row * pPattern->y_step()));
2320
2321        pdfium::base::CheckedNumeric<int> safeStartX =
2322            FXSYS_round(original.x + left_offset);
2323        pdfium::base::CheckedNumeric<int> safeStartY =
2324            FXSYS_round(original.y + top_offset);
2325
2326        safeStartX -= clip_box.left;
2327        safeStartY -= clip_box.top;
2328        if (!safeStartX.IsValid() || !safeStartY.IsValid())
2329          return;
2330
2331        start_x = safeStartX.ValueOrDie();
2332        start_y = safeStartY.ValueOrDie();
2333      }
2334      if (width == 1 && height == 1) {
2335        if (start_x < 0 || start_x >= clip_box.Width() || start_y < 0 ||
2336            start_y >= clip_box.Height()) {
2337          continue;
2338        }
2339        uint32_t* dest_buf =
2340            (uint32_t*)(screen.GetBuffer() + screen.GetPitch() * start_y +
2341                        start_x * 4);
2342        if (pPattern->colored())
2343          *dest_buf = *src_buf;
2344        else
2345          *dest_buf = (*(uint8_t*)src_buf << 24) | (fill_argb & 0xffffff);
2346      } else {
2347        if (pPattern->colored()) {
2348          screen.CompositeBitmap(start_x, start_y, width, height,
2349                                 pPatternBitmap.get(), 0, 0);
2350        } else {
2351          screen.CompositeMask(start_x, start_y, width, height,
2352                               pPatternBitmap.get(), fill_argb, 0, 0);
2353        }
2354      }
2355    }
2356  }
2357  CompositeDIBitmap(&screen, clip_box.left, clip_box.top, 0, 255,
2358                    FXDIB_BLEND_NORMAL, false);
2359  m_pDevice->RestoreState(false);
2360}
2361
2362void CPDF_RenderStatus::DrawPathWithPattern(CPDF_PathObject* pPathObj,
2363                                            const CFX_Matrix* pObj2Device,
2364                                            const CPDF_Color* pColor,
2365                                            bool bStroke) {
2366  CPDF_Pattern* pattern = pColor->GetPattern();
2367  if (!pattern)
2368    return;
2369
2370  if (CPDF_TilingPattern* pTilingPattern = pattern->AsTilingPattern())
2371    DrawTilingPattern(pTilingPattern, pPathObj, pObj2Device, bStroke);
2372  else if (CPDF_ShadingPattern* pShadingPattern = pattern->AsShadingPattern())
2373    DrawShadingPattern(pShadingPattern, pPathObj, pObj2Device, bStroke);
2374}
2375
2376void CPDF_RenderStatus::ProcessPathPattern(CPDF_PathObject* pPathObj,
2377                                           const CFX_Matrix* pObj2Device,
2378                                           int& filltype,
2379                                           bool& bStroke) {
2380  if (filltype) {
2381    const CPDF_Color& FillColor = *pPathObj->m_ColorState.GetFillColor();
2382    if (FillColor.IsPattern()) {
2383      DrawPathWithPattern(pPathObj, pObj2Device, &FillColor, false);
2384      filltype = 0;
2385    }
2386  }
2387  if (bStroke) {
2388    const CPDF_Color& StrokeColor = *pPathObj->m_ColorState.GetStrokeColor();
2389    if (StrokeColor.IsPattern()) {
2390      DrawPathWithPattern(pPathObj, pObj2Device, &StrokeColor, true);
2391      bStroke = false;
2392    }
2393  }
2394}
2395
2396bool CPDF_RenderStatus::ProcessImage(CPDF_ImageObject* pImageObj,
2397                                     const CFX_Matrix* pObj2Device) {
2398  CPDF_ImageRenderer render;
2399  if (render.Start(this, pImageObj, pObj2Device, m_bStdCS, m_curBlend))
2400    render.Continue(nullptr);
2401  return render.GetResult();
2402}
2403
2404void CPDF_RenderStatus::CompositeDIBitmap(CFX_DIBitmap* pDIBitmap,
2405                                          int left,
2406                                          int top,
2407                                          FX_ARGB mask_argb,
2408                                          int bitmap_alpha,
2409                                          int blend_mode,
2410                                          int Transparency) {
2411  if (!pDIBitmap) {
2412    return;
2413  }
2414  if (blend_mode == FXDIB_BLEND_NORMAL) {
2415    if (!pDIBitmap->IsAlphaMask()) {
2416      if (bitmap_alpha < 255) {
2417#ifdef _SKIA_SUPPORT_
2418        void* dummy;
2419        CFX_Matrix m(pDIBitmap->GetWidth(), 0, 0, -pDIBitmap->GetHeight(), left,
2420                     top + pDIBitmap->GetHeight());
2421        m_pDevice->StartDIBits(pDIBitmap, bitmap_alpha, 0, &m, 0, dummy);
2422        return;
2423#else
2424        pDIBitmap->MultiplyAlpha(bitmap_alpha);
2425#endif
2426      }
2427#ifdef _SKIA_SUPPORT_
2428      CFX_SkiaDeviceDriver::PreMultiply(pDIBitmap);
2429#endif
2430      if (m_pDevice->SetDIBits(pDIBitmap, left, top)) {
2431        return;
2432      }
2433    } else {
2434      uint32_t fill_argb = m_Options.TranslateColor(mask_argb);
2435      if (bitmap_alpha < 255) {
2436        ((uint8_t*)&fill_argb)[3] =
2437            ((uint8_t*)&fill_argb)[3] * bitmap_alpha / 255;
2438      }
2439      if (m_pDevice->SetBitMask(pDIBitmap, left, top, fill_argb)) {
2440        return;
2441      }
2442    }
2443  }
2444  bool bIsolated = !!(Transparency & PDFTRANS_ISOLATED);
2445  bool bGroup = !!(Transparency & PDFTRANS_GROUP);
2446  bool bBackAlphaRequired = blend_mode && bIsolated && !m_bDropObjects;
2447  bool bGetBackGround =
2448      ((m_pDevice->GetRenderCaps() & FXRC_ALPHA_OUTPUT)) ||
2449      (!(m_pDevice->GetRenderCaps() & FXRC_ALPHA_OUTPUT) &&
2450       (m_pDevice->GetRenderCaps() & FXRC_GET_BITS) && !bBackAlphaRequired);
2451  if (bGetBackGround) {
2452    if (bIsolated || !bGroup) {
2453      if (pDIBitmap->IsAlphaMask()) {
2454        return;
2455      }
2456      m_pDevice->SetDIBitsWithBlend(pDIBitmap, left, top, blend_mode);
2457    } else {
2458      FX_RECT rect(left, top, left + pDIBitmap->GetWidth(),
2459                   top + pDIBitmap->GetHeight());
2460      rect.Intersect(m_pDevice->GetClipBox());
2461      CFX_MaybeOwned<CFX_DIBitmap> pClone;
2462      if (m_pDevice->GetBackDrop() && m_pDevice->GetBitmap()) {
2463        pClone = m_pDevice->GetBackDrop()->Clone(&rect);
2464        CFX_DIBitmap* pForeBitmap = m_pDevice->GetBitmap();
2465        pClone->CompositeBitmap(0, 0, pClone->GetWidth(), pClone->GetHeight(),
2466                                pForeBitmap, rect.left, rect.top);
2467        left = left >= 0 ? 0 : left;
2468        top = top >= 0 ? 0 : top;
2469        if (!pDIBitmap->IsAlphaMask())
2470          pClone->CompositeBitmap(0, 0, pClone->GetWidth(), pClone->GetHeight(),
2471                                  pDIBitmap, left, top, blend_mode);
2472        else
2473          pClone->CompositeMask(0, 0, pClone->GetWidth(), pClone->GetHeight(),
2474                                pDIBitmap, mask_argb, left, top, blend_mode);
2475      } else {
2476        pClone = pDIBitmap;
2477      }
2478      if (m_pDevice->GetBackDrop()) {
2479        m_pDevice->SetDIBits(pClone.Get(), rect.left, rect.top);
2480      } else {
2481        if (pDIBitmap->IsAlphaMask())
2482          return;
2483        m_pDevice->SetDIBitsWithBlend(pDIBitmap, rect.left, rect.top,
2484                                      blend_mode);
2485      }
2486    }
2487    return;
2488  }
2489  int back_left, back_top;
2490  FX_RECT rect(left, top, left + pDIBitmap->GetWidth(),
2491               top + pDIBitmap->GetHeight());
2492  std::unique_ptr<CFX_DIBitmap> pBackdrop =
2493      GetBackdrop(m_pCurObj, rect, back_left, back_top,
2494                  blend_mode > FXDIB_BLEND_NORMAL && bIsolated);
2495  if (!pBackdrop)
2496    return;
2497
2498  if (!pDIBitmap->IsAlphaMask()) {
2499    pBackdrop->CompositeBitmap(left - back_left, top - back_top,
2500                               pDIBitmap->GetWidth(), pDIBitmap->GetHeight(),
2501                               pDIBitmap, 0, 0, blend_mode);
2502  } else {
2503    pBackdrop->CompositeMask(left - back_left, top - back_top,
2504                             pDIBitmap->GetWidth(), pDIBitmap->GetHeight(),
2505                             pDIBitmap, mask_argb, 0, 0, blend_mode);
2506  }
2507
2508  auto pBackdrop1 = pdfium::MakeUnique<CFX_DIBitmap>();
2509  pBackdrop1->Create(pBackdrop->GetWidth(), pBackdrop->GetHeight(),
2510                     FXDIB_Rgb32);
2511  pBackdrop1->Clear((uint32_t)-1);
2512  pBackdrop1->CompositeBitmap(0, 0, pBackdrop->GetWidth(),
2513                              pBackdrop->GetHeight(), pBackdrop.get(), 0, 0);
2514  pBackdrop = std::move(pBackdrop1);
2515  m_pDevice->SetDIBits(pBackdrop.get(), back_left, back_top);
2516}
2517
2518std::unique_ptr<CFX_DIBitmap> CPDF_RenderStatus::LoadSMask(
2519    CPDF_Dictionary* pSMaskDict,
2520    FX_RECT* pClipRect,
2521    const CFX_Matrix* pMatrix) {
2522  if (!pSMaskDict)
2523    return nullptr;
2524
2525  CPDF_Stream* pGroup = pSMaskDict->GetStreamFor("G");
2526  if (!pGroup)
2527    return nullptr;
2528
2529  std::unique_ptr<CPDF_Function> pFunc;
2530  CPDF_Object* pFuncObj = pSMaskDict->GetDirectObjectFor("TR");
2531  if (pFuncObj && (pFuncObj->IsDictionary() || pFuncObj->IsStream()))
2532    pFunc = CPDF_Function::Load(pFuncObj);
2533
2534  CFX_Matrix matrix = *pMatrix;
2535  matrix.Translate(-pClipRect->left, -pClipRect->top);
2536
2537  CPDF_Form form(m_pContext->GetDocument(), m_pContext->GetPageResources(),
2538                 pGroup);
2539  form.ParseContent(nullptr, nullptr, nullptr);
2540
2541  CFX_FxgeDevice bitmap_device;
2542  bool bLuminosity = pSMaskDict->GetStringFor("S") != "Alpha";
2543  int width = pClipRect->right - pClipRect->left;
2544  int height = pClipRect->bottom - pClipRect->top;
2545  FXDIB_Format format;
2546#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_ || defined _SKIA_SUPPORT_ || \
2547    defined _SKIA_SUPPORT_PATHS_
2548  format = bLuminosity ? FXDIB_Rgb32 : FXDIB_8bppMask;
2549#else
2550  format = bLuminosity ? FXDIB_Rgb : FXDIB_8bppMask;
2551#endif
2552  if (!bitmap_device.Create(width, height, format, nullptr))
2553    return nullptr;
2554
2555  CFX_DIBitmap& bitmap = *bitmap_device.GetBitmap();
2556  int color_space_family = 0;
2557  if (bLuminosity) {
2558    CPDF_Array* pBC = pSMaskDict->GetArrayFor("BC");
2559    FX_ARGB back_color = 0xff000000;
2560    if (pBC) {
2561      CPDF_Object* pCSObj = nullptr;
2562      CPDF_Dictionary* pDict = pGroup->GetDict();
2563      if (pDict && pDict->GetDictFor("Group")) {
2564        pCSObj = pDict->GetDictFor("Group")->GetDirectObjectFor("CS");
2565      }
2566      const CPDF_ColorSpace* pCS =
2567          m_pContext->GetDocument()->LoadColorSpace(pCSObj);
2568      if (pCS) {
2569        // Store Color Space Family to use in CPDF_RenderStatus::Initialize.
2570        color_space_family = pCS->GetFamily();
2571
2572        FX_FLOAT R, G, B;
2573        uint32_t comps = 8;
2574        if (pCS->CountComponents() > comps) {
2575          comps = pCS->CountComponents();
2576        }
2577        CFX_FixedBufGrow<FX_FLOAT, 8> float_array(comps);
2578        FX_FLOAT* pFloats = float_array;
2579        FX_SAFE_UINT32 num_floats = comps;
2580        num_floats *= sizeof(FX_FLOAT);
2581        if (!num_floats.IsValid()) {
2582          return nullptr;
2583        }
2584        FXSYS_memset(pFloats, 0, num_floats.ValueOrDie());
2585        size_t count = pBC->GetCount() > 8 ? 8 : pBC->GetCount();
2586        for (size_t i = 0; i < count; i++) {
2587          pFloats[i] = pBC->GetNumberAt(i);
2588        }
2589        pCS->GetRGB(pFloats, R, G, B);
2590        back_color = 0xff000000 | ((int32_t)(R * 255) << 16) |
2591                     ((int32_t)(G * 255) << 8) | (int32_t)(B * 255);
2592        m_pContext->GetDocument()->GetPageData()->ReleaseColorSpace(pCSObj);
2593      }
2594    }
2595    bitmap.Clear(back_color);
2596  } else {
2597    bitmap.Clear(0);
2598  }
2599  CPDF_Dictionary* pFormResource = nullptr;
2600  if (form.m_pFormDict) {
2601    pFormResource = form.m_pFormDict->GetDictFor("Resources");
2602  }
2603  CPDF_RenderOptions options;
2604  options.m_ColorMode = bLuminosity ? RENDER_COLOR_NORMAL : RENDER_COLOR_ALPHA;
2605  CPDF_RenderStatus status;
2606  status.Initialize(m_pContext, &bitmap_device, nullptr, nullptr, nullptr,
2607                    nullptr, &options, 0, m_bDropObjects, pFormResource, true,
2608                    nullptr, 0, color_space_family, bLuminosity);
2609  status.RenderObjectList(&form, &matrix);
2610
2611  auto pMask = pdfium::MakeUnique<CFX_DIBitmap>();
2612  if (!pMask->Create(width, height, FXDIB_8bppMask))
2613    return nullptr;
2614
2615  uint8_t* dest_buf = pMask->GetBuffer();
2616  int dest_pitch = pMask->GetPitch();
2617  uint8_t* src_buf = bitmap.GetBuffer();
2618  int src_pitch = bitmap.GetPitch();
2619  std::vector<uint8_t> transfers(256);
2620  if (pFunc) {
2621    CFX_FixedBufGrow<FX_FLOAT, 16> results(pFunc->CountOutputs());
2622    for (int i = 0; i < 256; i++) {
2623      FX_FLOAT input = (FX_FLOAT)i / 255.0f;
2624      int nresult;
2625      pFunc->Call(&input, 1, results, nresult);
2626      transfers[i] = FXSYS_round(results[0] * 255);
2627    }
2628  } else {
2629    for (int i = 0; i < 256; i++) {
2630      transfers[i] = i;
2631    }
2632  }
2633  if (bLuminosity) {
2634    int Bpp = bitmap.GetBPP() / 8;
2635    for (int row = 0; row < height; row++) {
2636      uint8_t* dest_pos = dest_buf + row * dest_pitch;
2637      uint8_t* src_pos = src_buf + row * src_pitch;
2638      for (int col = 0; col < width; col++) {
2639        *dest_pos++ = transfers[FXRGB2GRAY(src_pos[2], src_pos[1], *src_pos)];
2640        src_pos += Bpp;
2641      }
2642    }
2643  } else if (pFunc) {
2644    int size = dest_pitch * height;
2645    for (int i = 0; i < size; i++) {
2646      dest_buf[i] = transfers[src_buf[i]];
2647    }
2648  } else {
2649    FXSYS_memcpy(dest_buf, src_buf, dest_pitch * height);
2650  }
2651  return pMask;
2652}
2653