1/*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "SkCoreBlitters.h"
9#include "SkColorPriv.h"
10#include "SkShader.h"
11#include "SkUtils.h"
12#include "SkXfermode.h"
13#include "SkBlitMask.h"
14
15///////////////////////////////////////////////////////////////////////////////
16
17static void SkARGB32_Blit32(const SkBitmap& device, const SkMask& mask,
18                            const SkIRect& clip, SkPMColor srcColor) {
19    U8CPU alpha = SkGetPackedA32(srcColor);
20    unsigned flags = SkBlitRow::kSrcPixelAlpha_Flag32;
21    if (alpha != 255) {
22        flags |= SkBlitRow::kGlobalAlpha_Flag32;
23    }
24    SkBlitRow::Proc32 proc = SkBlitRow::Factory32(flags);
25
26    int x = clip.fLeft;
27    int y = clip.fTop;
28    int width = clip.width();
29    int height = clip.height();
30
31    SkPMColor*         dstRow = device.getAddr32(x, y);
32    const SkPMColor* srcRow = reinterpret_cast<const SkPMColor*>(mask.getAddr8(x, y));
33
34    do {
35        proc(dstRow, srcRow, width, alpha);
36        dstRow = (SkPMColor*)((char*)dstRow + device.rowBytes());
37        srcRow = (const SkPMColor*)((const char*)srcRow + mask.fRowBytes);
38    } while (--height != 0);
39}
40
41//////////////////////////////////////////////////////////////////////////////////////
42
43SkARGB32_Blitter::SkARGB32_Blitter(const SkBitmap& device, const SkPaint& paint)
44        : INHERITED(device) {
45    SkColor color = paint.getColor();
46    fColor = color;
47
48    fSrcA = SkColorGetA(color);
49    unsigned scale = SkAlpha255To256(fSrcA);
50    fSrcR = SkAlphaMul(SkColorGetR(color), scale);
51    fSrcG = SkAlphaMul(SkColorGetG(color), scale);
52    fSrcB = SkAlphaMul(SkColorGetB(color), scale);
53
54    fPMColor = SkPackARGB32(fSrcA, fSrcR, fSrcG, fSrcB);
55    fColor32Proc = SkBlitRow::ColorProcFactory();
56    fColorRect32Proc = SkBlitRow::ColorRectProcFactory();
57}
58
59const SkBitmap* SkARGB32_Blitter::justAnOpaqueColor(uint32_t* value) {
60    if (255 == fSrcA) {
61        *value = fPMColor;
62        return &fDevice;
63    }
64    return NULL;
65}
66
67#if defined _WIN32 && _MSC_VER >= 1300  // disable warning : local variable used without having been initialized
68#pragma warning ( push )
69#pragma warning ( disable : 4701 )
70#endif
71
72void SkARGB32_Blitter::blitH(int x, int y, int width) {
73    SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width());
74
75    uint32_t*   device = fDevice.getAddr32(x, y);
76    fColor32Proc(device, device, width, fPMColor);
77}
78
79void SkARGB32_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
80                                 const int16_t runs[]) {
81    if (fSrcA == 0) {
82        return;
83    }
84
85    uint32_t    color = fPMColor;
86    uint32_t*   device = fDevice.getAddr32(x, y);
87    unsigned    opaqueMask = fSrcA; // if fSrcA is 0xFF, then we will catch the fast opaque case
88
89    for (;;) {
90        int count = runs[0];
91        SkASSERT(count >= 0);
92        if (count <= 0) {
93            return;
94        }
95        unsigned aa = antialias[0];
96        if (aa) {
97            if ((opaqueMask & aa) == 255) {
98                sk_memset32(device, color, count);
99            } else {
100                uint32_t sc = SkAlphaMulQ(color, SkAlpha255To256(aa));
101                fColor32Proc(device, device, count, sc);
102            }
103        }
104        runs += count;
105        antialias += count;
106        device += count;
107    }
108}
109
110//////////////////////////////////////////////////////////////////////////////////////
111
112#define solid_8_pixels(mask, dst, color)    \
113    do {                                    \
114        if (mask & 0x80) dst[0] = color;    \
115        if (mask & 0x40) dst[1] = color;    \
116        if (mask & 0x20) dst[2] = color;    \
117        if (mask & 0x10) dst[3] = color;    \
118        if (mask & 0x08) dst[4] = color;    \
119        if (mask & 0x04) dst[5] = color;    \
120        if (mask & 0x02) dst[6] = color;    \
121        if (mask & 0x01) dst[7] = color;    \
122    } while (0)
123
124#define SK_BLITBWMASK_NAME                  SkARGB32_BlitBW
125#define SK_BLITBWMASK_ARGS                  , SkPMColor color
126#define SK_BLITBWMASK_BLIT8(mask, dst)      solid_8_pixels(mask, dst, color)
127#define SK_BLITBWMASK_GETADDR               getAddr32
128#define SK_BLITBWMASK_DEVTYPE               uint32_t
129#include "SkBlitBWMaskTemplate.h"
130
131#define blend_8_pixels(mask, dst, sc, dst_scale)                            \
132    do {                                                                    \
133        if (mask & 0x80) { dst[0] = sc + SkAlphaMulQ(dst[0], dst_scale); }  \
134        if (mask & 0x40) { dst[1] = sc + SkAlphaMulQ(dst[1], dst_scale); }  \
135        if (mask & 0x20) { dst[2] = sc + SkAlphaMulQ(dst[2], dst_scale); }  \
136        if (mask & 0x10) { dst[3] = sc + SkAlphaMulQ(dst[3], dst_scale); }  \
137        if (mask & 0x08) { dst[4] = sc + SkAlphaMulQ(dst[4], dst_scale); }  \
138        if (mask & 0x04) { dst[5] = sc + SkAlphaMulQ(dst[5], dst_scale); }  \
139        if (mask & 0x02) { dst[6] = sc + SkAlphaMulQ(dst[6], dst_scale); }  \
140        if (mask & 0x01) { dst[7] = sc + SkAlphaMulQ(dst[7], dst_scale); }  \
141    } while (0)
142
143#define SK_BLITBWMASK_NAME                  SkARGB32_BlendBW
144#define SK_BLITBWMASK_ARGS                  , uint32_t sc, unsigned dst_scale
145#define SK_BLITBWMASK_BLIT8(mask, dst)      blend_8_pixels(mask, dst, sc, dst_scale)
146#define SK_BLITBWMASK_GETADDR               getAddr32
147#define SK_BLITBWMASK_DEVTYPE               uint32_t
148#include "SkBlitBWMaskTemplate.h"
149
150void SkARGB32_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
151    SkASSERT(mask.fBounds.contains(clip));
152    SkASSERT(fSrcA != 0xFF);
153
154    if (fSrcA == 0) {
155        return;
156    }
157
158    if (SkBlitMask::BlitColor(fDevice, mask, clip, fColor)) {
159        return;
160    }
161
162    if (mask.fFormat == SkMask::kBW_Format) {
163        SkARGB32_BlendBW(fDevice, mask, clip, fPMColor, SkAlpha255To256(255 - fSrcA));
164    } else if (SkMask::kARGB32_Format == mask.fFormat) {
165        SkARGB32_Blit32(fDevice, mask, clip, fPMColor);
166    }
167}
168
169void SkARGB32_Opaque_Blitter::blitMask(const SkMask& mask,
170                                       const SkIRect& clip) {
171    SkASSERT(mask.fBounds.contains(clip));
172
173    if (SkBlitMask::BlitColor(fDevice, mask, clip, fColor)) {
174        return;
175    }
176
177    if (mask.fFormat == SkMask::kBW_Format) {
178        SkARGB32_BlitBW(fDevice, mask, clip, fPMColor);
179    } else if (SkMask::kARGB32_Format == mask.fFormat) {
180        SkARGB32_Blit32(fDevice, mask, clip, fPMColor);
181    }
182}
183
184///////////////////////////////////////////////////////////////////////////////
185
186void SkARGB32_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
187    if (alpha == 0 || fSrcA == 0) {
188        return;
189    }
190
191    uint32_t* device = fDevice.getAddr32(x, y);
192    uint32_t  color = fPMColor;
193
194    if (alpha != 255) {
195        color = SkAlphaMulQ(color, SkAlpha255To256(alpha));
196    }
197
198    unsigned dst_scale = 255 - SkGetPackedA32(color);
199    size_t rowBytes = fDevice.rowBytes();
200    while (--height >= 0) {
201        device[0] = color + SkAlphaMulQ(device[0], dst_scale);
202        device = (uint32_t*)((char*)device + rowBytes);
203    }
204}
205
206void SkARGB32_Blitter::blitRect(int x, int y, int width, int height) {
207    SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width() && y + height <= fDevice.height());
208
209    if (fSrcA == 0) {
210        return;
211    }
212
213    uint32_t*   device = fDevice.getAddr32(x, y);
214    uint32_t    color = fPMColor;
215    size_t      rowBytes = fDevice.rowBytes();
216
217    if (255 == SkGetPackedA32(color)) {
218        fColorRect32Proc(device, width, height, rowBytes, color);
219    } else {
220        while (--height >= 0) {
221            fColor32Proc(device, device, width, color);
222            device = (uint32_t*)((char*)device + rowBytes);
223        }
224    }
225}
226
227#if defined _WIN32 && _MSC_VER >= 1300
228#pragma warning ( pop )
229#endif
230
231///////////////////////////////////////////////////////////////////////
232
233void SkARGB32_Black_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
234                                       const int16_t runs[]) {
235    uint32_t*   device = fDevice.getAddr32(x, y);
236    SkPMColor   black = (SkPMColor)(SK_A32_MASK << SK_A32_SHIFT);
237
238    for (;;) {
239        int count = runs[0];
240        SkASSERT(count >= 0);
241        if (count <= 0) {
242            return;
243        }
244        unsigned aa = antialias[0];
245        if (aa) {
246            if (aa == 255) {
247                sk_memset32(device, black, count);
248            } else {
249                SkPMColor src = aa << SK_A32_SHIFT;
250                unsigned dst_scale = 256 - aa;
251                int n = count;
252                do {
253                    --n;
254                    device[n] = src + SkAlphaMulQ(device[n], dst_scale);
255                } while (n > 0);
256            }
257        }
258        runs += count;
259        antialias += count;
260        device += count;
261    }
262}
263
264///////////////////////////////////////////////////////////////////////////////
265
266// Special version of SkBlitRow::Factory32 that knows we're in kSrc_Mode,
267// instead of kSrcOver_Mode
268static void blend_srcmode(SkPMColor* SK_RESTRICT device,
269                          const SkPMColor* SK_RESTRICT span,
270                          int count, U8CPU aa) {
271    int aa256 = SkAlpha255To256(aa);
272    for (int i = 0; i < count; ++i) {
273        device[i] = SkFourByteInterp256(span[i], device[i], aa256);
274    }
275}
276
277SkARGB32_Shader_Blitter::SkARGB32_Shader_Blitter(const SkBitmap& device,
278                            const SkPaint& paint) : INHERITED(device, paint) {
279    fBuffer = (SkPMColor*)sk_malloc_throw(device.width() * (sizeof(SkPMColor)));
280
281    fXfermode = paint.getXfermode();
282    SkSafeRef(fXfermode);
283
284    int flags = 0;
285    if (!(fShader->getFlags() & SkShader::kOpaqueAlpha_Flag)) {
286        flags |= SkBlitRow::kSrcPixelAlpha_Flag32;
287    }
288    // we call this on the output from the shader
289    fProc32 = SkBlitRow::Factory32(flags);
290    // we call this on the output from the shader + alpha from the aa buffer
291    fProc32Blend = SkBlitRow::Factory32(flags | SkBlitRow::kGlobalAlpha_Flag32);
292
293    fShadeDirectlyIntoDevice = false;
294    if (fXfermode == NULL) {
295        if (fShader->getFlags() & SkShader::kOpaqueAlpha_Flag) {
296            fShadeDirectlyIntoDevice = true;
297        }
298    } else {
299        SkXfermode::Mode mode;
300        if (fXfermode->asMode(&mode)) {
301            if (SkXfermode::kSrc_Mode == mode) {
302                fShadeDirectlyIntoDevice = true;
303                fProc32Blend = blend_srcmode;
304            }
305        }
306    }
307
308    fConstInY = SkToBool(fShader->getFlags() & SkShader::kConstInY32_Flag);
309}
310
311SkARGB32_Shader_Blitter::~SkARGB32_Shader_Blitter() {
312    SkSafeUnref(fXfermode);
313    sk_free(fBuffer);
314}
315
316void SkARGB32_Shader_Blitter::blitH(int x, int y, int width) {
317    SkASSERT(x >= 0 && y >= 0 && x + width <= fDevice.width());
318
319    uint32_t*   device = fDevice.getAddr32(x, y);
320
321    if (fShadeDirectlyIntoDevice) {
322        fShader->shadeSpan(x, y, device, width);
323    } else {
324        SkPMColor*  span = fBuffer;
325        fShader->shadeSpan(x, y, span, width);
326        if (fXfermode) {
327            fXfermode->xfer32(device, span, width, NULL);
328        } else {
329            fProc32(device, span, width, 255);
330        }
331    }
332}
333
334void SkARGB32_Shader_Blitter::blitRect(int x, int y, int width, int height) {
335    SkASSERT(x >= 0 && y >= 0 &&
336             x + width <= fDevice.width() && y + height <= fDevice.height());
337
338    uint32_t*   device = fDevice.getAddr32(x, y);
339    size_t      deviceRB = fDevice.rowBytes();
340    SkShader*   shader = fShader;
341    SkPMColor*  span = fBuffer;
342
343    if (fConstInY) {
344        if (fShadeDirectlyIntoDevice) {
345            // shade the first row directly into the device
346            fShader->shadeSpan(x, y, device, width);
347            span = device;
348            while (--height > 0) {
349                device = (uint32_t*)((char*)device + deviceRB);
350                memcpy(device, span, width << 2);
351            }
352        } else {
353            fShader->shadeSpan(x, y, span, width);
354            SkXfermode* xfer = fXfermode;
355            if (xfer) {
356                do {
357                    xfer->xfer32(device, span, width, NULL);
358                    y += 1;
359                    device = (uint32_t*)((char*)device + deviceRB);
360                } while (--height > 0);
361            } else {
362                SkBlitRow::Proc32 proc = fProc32;
363                do {
364                    proc(device, span, width, 255);
365                    y += 1;
366                    device = (uint32_t*)((char*)device + deviceRB);
367                } while (--height > 0);
368            }
369        }
370        return;
371    }
372
373    if (fShadeDirectlyIntoDevice) {
374        void* ctx;
375        SkShader::ShadeProc shadeProc = fShader->asAShadeProc(&ctx);
376        if (shadeProc) {
377            do {
378                shadeProc(ctx, x, y, device, width);
379                y += 1;
380                device = (uint32_t*)((char*)device + deviceRB);
381            } while (--height > 0);
382        } else {
383            do {
384                shader->shadeSpan(x, y, device, width);
385                y += 1;
386                device = (uint32_t*)((char*)device + deviceRB);
387            } while (--height > 0);
388        }
389    } else {
390        SkXfermode* xfer = fXfermode;
391        if (xfer) {
392            do {
393                shader->shadeSpan(x, y, span, width);
394                xfer->xfer32(device, span, width, NULL);
395                y += 1;
396                device = (uint32_t*)((char*)device + deviceRB);
397            } while (--height > 0);
398        } else {
399            SkBlitRow::Proc32 proc = fProc32;
400            do {
401                shader->shadeSpan(x, y, span, width);
402                proc(device, span, width, 255);
403                y += 1;
404                device = (uint32_t*)((char*)device + deviceRB);
405            } while (--height > 0);
406        }
407    }
408}
409
410void SkARGB32_Shader_Blitter::blitAntiH(int x, int y, const SkAlpha antialias[],
411                                        const int16_t runs[]) {
412    SkPMColor*  span = fBuffer;
413    uint32_t*   device = fDevice.getAddr32(x, y);
414    SkShader*   shader = fShader;
415
416    if (fXfermode && !fShadeDirectlyIntoDevice) {
417        for (;;) {
418            SkXfermode* xfer = fXfermode;
419
420            int count = *runs;
421            if (count <= 0)
422                break;
423            int aa = *antialias;
424            if (aa) {
425                shader->shadeSpan(x, y, span, count);
426                if (aa == 255) {
427                    xfer->xfer32(device, span, count, NULL);
428                } else {
429                    // count is almost always 1
430                    for (int i = count - 1; i >= 0; --i) {
431                        xfer->xfer32(&device[i], &span[i], 1, antialias);
432                    }
433                }
434            }
435            device += count;
436            runs += count;
437            antialias += count;
438            x += count;
439        }
440    } else if (fShadeDirectlyIntoDevice ||
441               (fShader->getFlags() & SkShader::kOpaqueAlpha_Flag)) {
442        for (;;) {
443            int count = *runs;
444            if (count <= 0) {
445                break;
446            }
447            int aa = *antialias;
448            if (aa) {
449                if (aa == 255) {
450                    // cool, have the shader draw right into the device
451                    shader->shadeSpan(x, y, device, count);
452                } else {
453                    shader->shadeSpan(x, y, span, count);
454                    fProc32Blend(device, span, count, aa);
455                }
456            }
457            device += count;
458            runs += count;
459            antialias += count;
460            x += count;
461        }
462    } else {
463        for (;;) {
464            int count = *runs;
465            if (count <= 0) {
466                break;
467            }
468            int aa = *antialias;
469            if (aa) {
470                fShader->shadeSpan(x, y, span, count);
471                if (aa == 255) {
472                    fProc32(device, span, count, 255);
473                } else {
474                    fProc32Blend(device, span, count, aa);
475                }
476            }
477            device += count;
478            runs += count;
479            antialias += count;
480            x += count;
481        }
482    }
483}
484
485void SkARGB32_Shader_Blitter::blitMask(const SkMask& mask, const SkIRect& clip) {
486    // we only handle kA8 with an xfermode
487    if (fXfermode && (SkMask::kA8_Format != mask.fFormat)) {
488        this->INHERITED::blitMask(mask, clip);
489        return;
490    }
491
492    SkASSERT(mask.fBounds.contains(clip));
493
494    SkBlitMask::RowProc proc = NULL;
495    if (!fXfermode) {
496        unsigned flags = 0;
497        if (fShader->getFlags() & SkShader::kOpaqueAlpha_Flag) {
498            flags |= SkBlitMask::kSrcIsOpaque_RowFlag;
499        }
500        proc = SkBlitMask::RowFactory(SkBitmap::kARGB_8888_Config, mask.fFormat,
501                                      (SkBlitMask::RowFlags)flags);
502        if (NULL == proc) {
503            this->INHERITED::blitMask(mask, clip);
504            return;
505        }
506    }
507
508    const int x = clip.fLeft;
509    const int width = clip.width();
510    int y = clip.fTop;
511    int height = clip.height();
512
513    char* dstRow = (char*)fDevice.getAddr32(x, y);
514    const size_t dstRB = fDevice.rowBytes();
515    const uint8_t* maskRow = (const uint8_t*)mask.getAddr(x, y);
516    const size_t maskRB = mask.fRowBytes;
517
518    SkShader* shader = fShader;
519    SkPMColor* span = fBuffer;
520
521    if (fXfermode) {
522        SkASSERT(SkMask::kA8_Format == mask.fFormat);
523        SkXfermode* xfer = fXfermode;
524        do {
525            shader->shadeSpan(x, y, span, width);
526            xfer->xfer32((SkPMColor*)dstRow, span, width, maskRow);
527            dstRow += dstRB;
528            maskRow += maskRB;
529            y += 1;
530        } while (--height > 0);
531    } else {
532        do {
533            shader->shadeSpan(x, y, span, width);
534            proc(dstRow, maskRow, span, width);
535            dstRow += dstRB;
536            maskRow += maskRB;
537            y += 1;
538        } while (--height > 0);
539    }
540}
541
542void SkARGB32_Shader_Blitter::blitV(int x, int y, int height, SkAlpha alpha) {
543    SkASSERT(x >= 0 && y >= 0 && y + height <= fDevice.height());
544
545    uint32_t*   device = fDevice.getAddr32(x, y);
546    size_t      deviceRB = fDevice.rowBytes();
547    SkShader*   shader = fShader;
548
549    if (fConstInY) {
550        SkPMColor c;
551        fShader->shadeSpan(x, y, &c, 1);
552
553        if (fShadeDirectlyIntoDevice) {
554            if (255 == alpha) {
555                do {
556                    *device = c;
557                    device = (uint32_t*)((char*)device + deviceRB);
558                } while (--height > 0);
559            } else {
560                do {
561                    *device = SkFourByteInterp(c, *device, alpha);
562                    device = (uint32_t*)((char*)device + deviceRB);
563                } while (--height > 0);
564            }
565        } else {
566            SkXfermode* xfer = fXfermode;
567            if (xfer) {
568                do {
569                    xfer->xfer32(device, &c, 1, &alpha);
570                    device = (uint32_t*)((char*)device + deviceRB);
571                } while (--height > 0);
572            } else {
573                SkBlitRow::Proc32 proc = (255 == alpha) ? fProc32 : fProc32Blend;
574                do {
575                    proc(device, &c, 1, alpha);
576                    device = (uint32_t*)((char*)device + deviceRB);
577                } while (--height > 0);
578            }
579        }
580        return;
581    }
582
583    if (fShadeDirectlyIntoDevice) {
584        void* ctx;
585        SkShader::ShadeProc shadeProc = fShader->asAShadeProc(&ctx);
586        if (255 == alpha) {
587            if (shadeProc) {
588                do {
589                    shadeProc(ctx, x, y, device, 1);
590                    y += 1;
591                    device = (uint32_t*)((char*)device + deviceRB);
592                } while (--height > 0);
593            } else {
594                do {
595                    shader->shadeSpan(x, y, device, 1);
596                    y += 1;
597                    device = (uint32_t*)((char*)device + deviceRB);
598                } while (--height > 0);
599            }
600        } else {    // alpha < 255
601            SkPMColor c;
602            if (shadeProc) {
603                do {
604                    shadeProc(ctx, x, y, &c, 1);
605                    *device = SkFourByteInterp(c, *device, alpha);
606                    y += 1;
607                    device = (uint32_t*)((char*)device + deviceRB);
608                } while (--height > 0);
609            } else {
610                do {
611                    shader->shadeSpan(x, y, &c, 1);
612                    *device = SkFourByteInterp(c, *device, alpha);
613                    y += 1;
614                    device = (uint32_t*)((char*)device + deviceRB);
615                } while (--height > 0);
616            }
617        }
618    } else {
619        SkPMColor* span = fBuffer;
620        SkXfermode* xfer = fXfermode;
621        if (xfer) {
622            do {
623                shader->shadeSpan(x, y, span, 1);
624                xfer->xfer32(device, span, 1, &alpha);
625                y += 1;
626                device = (uint32_t*)((char*)device + deviceRB);
627            } while (--height > 0);
628        } else {
629            SkBlitRow::Proc32 proc = (255 == alpha) ? fProc32 : fProc32Blend;
630            do {
631                shader->shadeSpan(x, y, span, 1);
632                proc(device, span, 1, alpha);
633                y += 1;
634                device = (uint32_t*)((char*)device + deviceRB);
635            } while (--height > 0);
636        }
637    }
638}
639