SkDraw.cpp revision 4024f32d99b63a599c544a49f526e53c25135159 
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
9#include "SkDraw.h"
10#include "SkBlitter.h"
11#include "SkBounder.h"
12#include "SkCanvas.h"
13#include "SkColorPriv.h"
14#include "SkDevice.h"
15#include "SkFixed.h"
16#include "SkMaskFilter.h"
17#include "SkPaint.h"
18#include "SkPathEffect.h"
19#include "SkRasterClip.h"
20#include "SkRasterizer.h"
21#include "SkScan.h"
22#include "SkShader.h"
23#include "SkString.h"
24#include "SkStroke.h"
25#include "SkTemplatesPriv.h"
26#include "SkTLazy.h"
27#include "SkUtils.h"
28
29#include "SkAutoKern.h"
30#include "SkBitmapProcShader.h"
31#include "SkDrawProcs.h"
32#include "SkMatrixUtils.h"
33
34//#define TRACE_BITMAP_DRAWS
35
36#define kBlitterStorageLongCount    (sizeof(SkBitmapProcShader) >> 2)
37
38/** Helper for allocating small blitters on the stack.
39 */
40class SkAutoBlitterChoose : SkNoncopyable {
41public:
42    SkAutoBlitterChoose() {
43        fBlitter = NULL;
44    }
45    SkAutoBlitterChoose(const SkBitmap& device, const SkMatrix& matrix,
46                        const SkPaint& paint) {
47        fBlitter = SkBlitter::Choose(device, matrix, paint,
48                                     fStorage, sizeof(fStorage));
49    }
50
51    ~SkAutoBlitterChoose();
52
53    SkBlitter*  operator->() { return fBlitter; }
54    SkBlitter*  get() const { return fBlitter; }
55
56    void choose(const SkBitmap& device, const SkMatrix& matrix,
57                const SkPaint& paint) {
58        SkASSERT(!fBlitter);
59        fBlitter = SkBlitter::Choose(device, matrix, paint,
60                                     fStorage, sizeof(fStorage));
61    }
62
63private:
64    SkBlitter*  fBlitter;
65    uint32_t    fStorage[kBlitterStorageLongCount];
66};
67
68SkAutoBlitterChoose::~SkAutoBlitterChoose() {
69    if ((void*)fBlitter == (void*)fStorage) {
70        fBlitter->~SkBlitter();
71    } else {
72        SkDELETE(fBlitter);
73    }
74}
75
76/**
77 *  Since we are providing the storage for the shader (to avoid the perf cost
78 *  of calling new) we insist that in our destructor we can account for all
79 *  owners of the shader.
80 */
81class SkAutoBitmapShaderInstall : SkNoncopyable {
82public:
83    SkAutoBitmapShaderInstall(const SkBitmap& src, const SkPaint& paint)
84            : fPaint(paint) /* makes a copy of the paint */ {
85        fPaint.setShader(SkShader::CreateBitmapShader(src,
86                           SkShader::kClamp_TileMode, SkShader::kClamp_TileMode,
87                           fStorage, sizeof(fStorage)));
88        // we deliberately left the shader with an owner-count of 2
89        SkASSERT(2 == fPaint.getShader()->getRefCnt());
90    }
91
92    ~SkAutoBitmapShaderInstall() {
93        SkShader* shader = fPaint.getShader();
94        // since we manually destroy shader, we insist that owners == 2
95        SkASSERT(2 == shader->getRefCnt());
96
97        fPaint.setShader(NULL); // unref the shader by 1
98
99        // now destroy to take care of the 2nd owner-count
100        if ((void*)shader == (void*)fStorage) {
101            shader->~SkShader();
102        } else {
103            SkDELETE(shader);
104        }
105    }
106
107    // return the new paint that has the shader applied
108    const SkPaint& paintWithShader() const { return fPaint; }
109
110private:
111    SkPaint     fPaint; // copy of caller's paint (which we then modify)
112    uint32_t    fStorage[kBlitterStorageLongCount];
113};
114
115///////////////////////////////////////////////////////////////////////////////
116
117SkDraw::SkDraw() {
118    sk_bzero(this, sizeof(*this));
119}
120
121SkDraw::SkDraw(const SkDraw& src) {
122    memcpy(this, &src, sizeof(*this));
123}
124
125bool SkDraw::computeConservativeLocalClipBounds(SkRect* localBounds) const {
126    if (fRC->isEmpty()) {
127        return false;
128    }
129
130    SkMatrix inverse;
131    if (!fMatrix->invert(&inverse)) {
132        return false;
133    }
134
135    SkIRect devBounds = fRC->getBounds();
136    // outset to have slop for antialasing and hairlines
137    devBounds.outset(1, 1);
138    inverse.mapRect(localBounds, SkRect::Make(devBounds));
139    return true;
140}
141
142///////////////////////////////////////////////////////////////////////////////
143
144typedef void (*BitmapXferProc)(void* pixels, size_t bytes, uint32_t data);
145
146static void D_Clear_BitmapXferProc(void* pixels, size_t bytes, uint32_t) {
147    sk_bzero(pixels, bytes);
148}
149
150static void D_Dst_BitmapXferProc(void*, size_t, uint32_t data) {}
151
152static void D32_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
153    sk_memset32((uint32_t*)pixels, data, bytes >> 2);
154}
155
156static void D16_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
157    sk_memset16((uint16_t*)pixels, data, bytes >> 1);
158}
159
160static void DA8_Src_BitmapXferProc(void* pixels, size_t bytes, uint32_t data) {
161    memset(pixels, data, bytes);
162}
163
164static BitmapXferProc ChooseBitmapXferProc(const SkBitmap& bitmap,
165                                           const SkPaint& paint,
166                                           uint32_t* data) {
167    // todo: we can apply colorfilter up front if no shader, so we wouldn't
168    // need to abort this fastpath
169    if (paint.getShader() || paint.getColorFilter()) {
170        return NULL;
171    }
172
173    SkXfermode::Mode mode;
174    if (!SkXfermode::AsMode(paint.getXfermode(), &mode)) {
175        return NULL;
176    }
177
178    SkColor color = paint.getColor();
179
180    // collaps modes based on color...
181    if (SkXfermode::kSrcOver_Mode == mode) {
182        unsigned alpha = SkColorGetA(color);
183        if (0 == alpha) {
184            mode = SkXfermode::kDst_Mode;
185        } else if (0xFF == alpha) {
186            mode = SkXfermode::kSrc_Mode;
187        }
188    }
189
190    switch (mode) {
191        case SkXfermode::kClear_Mode:
192//            SkDebugf("--- D_Clear_BitmapXferProc\n");
193            return D_Clear_BitmapXferProc;  // ignore data
194        case SkXfermode::kDst_Mode:
195//            SkDebugf("--- D_Dst_BitmapXferProc\n");
196            return D_Dst_BitmapXferProc;    // ignore data
197        case SkXfermode::kSrc_Mode: {
198            /*
199                should I worry about dithering for the lower depths?
200            */
201            SkPMColor pmc = SkPreMultiplyColor(color);
202            switch (bitmap.config()) {
203                case SkBitmap::kARGB_8888_Config:
204                    if (data) {
205                        *data = pmc;
206                    }
207//                    SkDebugf("--- D32_Src_BitmapXferProc\n");
208                    return D32_Src_BitmapXferProc;
209                case SkBitmap::kARGB_4444_Config:
210                    if (data) {
211                        *data = SkPixel32ToPixel4444(pmc);
212                    }
213//                    SkDebugf("--- D16_Src_BitmapXferProc\n");
214                    return D16_Src_BitmapXferProc;
215                case SkBitmap::kRGB_565_Config:
216                    if (data) {
217                        *data = SkPixel32ToPixel16(pmc);
218                    }
219//                    SkDebugf("--- D16_Src_BitmapXferProc\n");
220                    return D16_Src_BitmapXferProc;
221                case SkBitmap::kA8_Config:
222                    if (data) {
223                        *data = SkGetPackedA32(pmc);
224                    }
225//                    SkDebugf("--- DA8_Src_BitmapXferProc\n");
226                    return DA8_Src_BitmapXferProc;
227                default:
228                    break;
229            }
230            break;
231        }
232        default:
233            break;
234    }
235    return NULL;
236}
237
238static void CallBitmapXferProc(const SkBitmap& bitmap, const SkIRect& rect,
239                               BitmapXferProc proc, uint32_t procData) {
240    int shiftPerPixel;
241    switch (bitmap.config()) {
242        case SkBitmap::kARGB_8888_Config:
243            shiftPerPixel = 2;
244            break;
245        case SkBitmap::kARGB_4444_Config:
246        case SkBitmap::kRGB_565_Config:
247            shiftPerPixel = 1;
248            break;
249        case SkBitmap::kA8_Config:
250            shiftPerPixel = 0;
251            break;
252        default:
253            SkDEBUGFAIL("Can't use xferproc on this config");
254            return;
255    }
256
257    uint8_t* pixels = (uint8_t*)bitmap.getPixels();
258    SkASSERT(pixels);
259    const size_t rowBytes = bitmap.rowBytes();
260    const int widthBytes = rect.width() << shiftPerPixel;
261
262    // skip down to the first scanline and X position
263    pixels += rect.fTop * rowBytes + (rect.fLeft << shiftPerPixel);
264    for (int scans = rect.height() - 1; scans >= 0; --scans) {
265        proc(pixels, widthBytes, procData);
266        pixels += rowBytes;
267    }
268}
269
270void SkDraw::drawPaint(const SkPaint& paint) const {
271    SkDEBUGCODE(this->validate();)
272
273    if (fRC->isEmpty()) {
274        return;
275    }
276
277    SkIRect    devRect;
278    devRect.set(0, 0, fBitmap->width(), fBitmap->height());
279    if (fBounder && !fBounder->doIRect(devRect)) {
280        return;
281    }
282
283    if (fRC->isBW()) {
284        /*  If we don't have a shader (i.e. we're just a solid color) we may
285            be faster to operate directly on the device bitmap, rather than invoking
286            a blitter. Esp. true for xfermodes, which require a colorshader to be
287            present, which is just redundant work. Since we're drawing everywhere
288            in the clip, we don't have to worry about antialiasing.
289        */
290        uint32_t procData = 0;  // to avoid the warning
291        BitmapXferProc proc = ChooseBitmapXferProc(*fBitmap, paint, &procData);
292        if (proc) {
293            if (D_Dst_BitmapXferProc == proc) { // nothing to do
294                return;
295            }
296
297            SkRegion::Iterator iter(fRC->bwRgn());
298            while (!iter.done()) {
299                CallBitmapXferProc(*fBitmap, iter.rect(), proc, procData);
300                iter.next();
301            }
302            return;
303        }
304    }
305
306    // normal case: use a blitter
307    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);
308    SkScan::FillIRect(devRect, *fRC, blitter.get());
309}
310
311///////////////////////////////////////////////////////////////////////////////
312
313struct PtProcRec {
314    SkCanvas::PointMode fMode;
315    const SkPaint*  fPaint;
316    const SkRegion* fClip;
317    const SkRasterClip* fRC;
318
319    // computed values
320    SkFixed fRadius;
321
322    typedef void (*Proc)(const PtProcRec&, const SkPoint devPts[], int count,
323                         SkBlitter*);
324
325    bool init(SkCanvas::PointMode, const SkPaint&, const SkMatrix* matrix,
326              const SkRasterClip*);
327    Proc chooseProc(SkBlitter** blitter);
328
329private:
330    SkAAClipBlitterWrapper fWrapper;
331};
332
333static void bw_pt_rect_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
334                                 int count, SkBlitter* blitter) {
335    SkASSERT(rec.fClip->isRect());
336    const SkIRect& r = rec.fClip->getBounds();
337
338    for (int i = 0; i < count; i++) {
339        int x = SkScalarFloorToInt(devPts[i].fX);
340        int y = SkScalarFloorToInt(devPts[i].fY);
341        if (r.contains(x, y)) {
342            blitter->blitH(x, y, 1);
343        }
344    }
345}
346
347static void bw_pt_rect_16_hair_proc(const PtProcRec& rec,
348                                    const SkPoint devPts[], int count,
349                                    SkBlitter* blitter) {
350    SkASSERT(rec.fRC->isRect());
351    const SkIRect& r = rec.fRC->getBounds();
352    uint32_t value;
353    const SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
354    SkASSERT(bitmap);
355
356    uint16_t* addr = bitmap->getAddr16(0, 0);
357    int rb = bitmap->rowBytes();
358
359    for (int i = 0; i < count; i++) {
360        int x = SkScalarFloorToInt(devPts[i].fX);
361        int y = SkScalarFloorToInt(devPts[i].fY);
362        if (r.contains(x, y)) {
363            ((uint16_t*)((char*)addr + y * rb))[x] = SkToU16(value);
364        }
365    }
366}
367
368static void bw_pt_rect_32_hair_proc(const PtProcRec& rec,
369                                    const SkPoint devPts[], int count,
370                                    SkBlitter* blitter) {
371    SkASSERT(rec.fRC->isRect());
372    const SkIRect& r = rec.fRC->getBounds();
373    uint32_t value;
374    const SkBitmap* bitmap = blitter->justAnOpaqueColor(&value);
375    SkASSERT(bitmap);
376
377    SkPMColor* addr = bitmap->getAddr32(0, 0);
378    int rb = bitmap->rowBytes();
379
380    for (int i = 0; i < count; i++) {
381        int x = SkScalarFloorToInt(devPts[i].fX);
382        int y = SkScalarFloorToInt(devPts[i].fY);
383        if (r.contains(x, y)) {
384            ((SkPMColor*)((char*)addr + y * rb))[x] = value;
385        }
386    }
387}
388
389static void bw_pt_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
390                            int count, SkBlitter* blitter) {
391    for (int i = 0; i < count; i++) {
392        int x = SkScalarFloor(devPts[i].fX);
393        int y = SkScalarFloor(devPts[i].fY);
394        if (rec.fClip->contains(x, y)) {
395            blitter->blitH(x, y, 1);
396        }
397    }
398}
399
400static void bw_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
401                              int count, SkBlitter* blitter) {
402    for (int i = 0; i < count; i += 2) {
403        SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
404    }
405}
406
407static void bw_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
408                              int count, SkBlitter* blitter) {
409    for (int i = 0; i < count - 1; i++) {
410        SkScan::HairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
411    }
412}
413
414// aa versions
415
416static void aa_line_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
417                              int count, SkBlitter* blitter) {
418    for (int i = 0; i < count; i += 2) {
419        SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
420    }
421}
422
423static void aa_poly_hair_proc(const PtProcRec& rec, const SkPoint devPts[],
424                              int count, SkBlitter* blitter) {
425    for (int i = 0; i < count - 1; i++) {
426        SkScan::AntiHairLine(devPts[i], devPts[i+1], *rec.fRC, blitter);
427    }
428}
429
430// square procs (strokeWidth > 0 but matrix is square-scale (sx == sy)
431
432static void bw_square_proc(const PtProcRec& rec, const SkPoint devPts[],
433                           int count, SkBlitter* blitter) {
434    const SkFixed radius = rec.fRadius;
435    for (int i = 0; i < count; i++) {
436        SkFixed x = SkScalarToFixed(devPts[i].fX);
437        SkFixed y = SkScalarToFixed(devPts[i].fY);
438
439        SkXRect r;
440        r.fLeft = x - radius;
441        r.fTop = y - radius;
442        r.fRight = x + radius;
443        r.fBottom = y + radius;
444
445        SkScan::FillXRect(r, *rec.fRC, blitter);
446    }
447}
448
449static void aa_square_proc(const PtProcRec& rec, const SkPoint devPts[],
450                           int count, SkBlitter* blitter) {
451    const SkFixed radius = rec.fRadius;
452    for (int i = 0; i < count; i++) {
453        SkFixed x = SkScalarToFixed(devPts[i].fX);
454        SkFixed y = SkScalarToFixed(devPts[i].fY);
455
456        SkXRect r;
457        r.fLeft = x - radius;
458        r.fTop = y - radius;
459        r.fRight = x + radius;
460        r.fBottom = y + radius;
461
462        SkScan::AntiFillXRect(r, *rec.fRC, blitter);
463    }
464}
465
466// If this guy returns true, then chooseProc() must return a valid proc
467bool PtProcRec::init(SkCanvas::PointMode mode, const SkPaint& paint,
468                     const SkMatrix* matrix, const SkRasterClip* rc) {
469    if (paint.getPathEffect()) {
470        return false;
471    }
472    SkScalar width = paint.getStrokeWidth();
473    if (0 == width) {
474        fMode = mode;
475        fPaint = &paint;
476        fClip = NULL;
477        fRC = rc;
478        fRadius = SK_FixedHalf;
479        return true;
480    }
481    if (paint.getStrokeCap() != SkPaint::kRound_Cap &&
482            matrix->rectStaysRect() && SkCanvas::kPoints_PointMode == mode) {
483        SkScalar sx = matrix->get(SkMatrix::kMScaleX);
484        SkScalar sy = matrix->get(SkMatrix::kMScaleY);
485        if (SkScalarNearlyZero(sx - sy)) {
486            if (sx < 0) {
487                sx = -sx;
488            }
489
490            fMode = mode;
491            fPaint = &paint;
492            fClip = NULL;
493            fRC = rc;
494            fRadius = SkScalarToFixed(SkScalarMul(width, sx)) >> 1;
495            return true;
496        }
497    }
498    return false;
499}
500
501PtProcRec::Proc PtProcRec::chooseProc(SkBlitter** blitterPtr) {
502    Proc proc = NULL;
503
504    SkBlitter* blitter = *blitterPtr;
505    if (fRC->isBW()) {
506        fClip = &fRC->bwRgn();
507    } else {
508        fWrapper.init(*fRC, blitter);
509        fClip = &fWrapper.getRgn();
510        blitter = fWrapper.getBlitter();
511        *blitterPtr = blitter;
512    }
513
514    // for our arrays
515    SkASSERT(0 == SkCanvas::kPoints_PointMode);
516    SkASSERT(1 == SkCanvas::kLines_PointMode);
517    SkASSERT(2 == SkCanvas::kPolygon_PointMode);
518    SkASSERT((unsigned)fMode <= (unsigned)SkCanvas::kPolygon_PointMode);
519
520    if (fPaint->isAntiAlias()) {
521        if (0 == fPaint->getStrokeWidth()) {
522            static const Proc gAAProcs[] = {
523                aa_square_proc, aa_line_hair_proc, aa_poly_hair_proc
524            };
525            proc = gAAProcs[fMode];
526        } else if (fPaint->getStrokeCap() != SkPaint::kRound_Cap) {
527            SkASSERT(SkCanvas::kPoints_PointMode == fMode);
528            proc = aa_square_proc;
529        }
530    } else {    // BW
531        if (fRadius <= SK_FixedHalf) {    // small radii and hairline
532            if (SkCanvas::kPoints_PointMode == fMode && fClip->isRect()) {
533                uint32_t value;
534                const SkBitmap* bm = blitter->justAnOpaqueColor(&value);
535                if (bm && SkBitmap::kRGB_565_Config == bm->config()) {
536                    proc = bw_pt_rect_16_hair_proc;
537                } else if (bm && SkBitmap::kARGB_8888_Config == bm->config()) {
538                    proc = bw_pt_rect_32_hair_proc;
539                } else {
540                    proc = bw_pt_rect_hair_proc;
541                }
542            } else {
543                static Proc gBWProcs[] = {
544                    bw_pt_hair_proc, bw_line_hair_proc, bw_poly_hair_proc
545                };
546                proc = gBWProcs[fMode];
547            }
548        } else {
549            proc = bw_square_proc;
550        }
551    }
552    return proc;
553}
554
555static bool bounder_points(SkBounder* bounder, SkCanvas::PointMode mode,
556                           size_t count, const SkPoint pts[],
557                           const SkPaint& paint, const SkMatrix& matrix) {
558    SkIRect ibounds;
559    SkRect bounds;
560    SkScalar inset = paint.getStrokeWidth();
561
562    bounds.set(pts, count);
563    bounds.inset(-inset, -inset);
564    matrix.mapRect(&bounds);
565
566    bounds.roundOut(&ibounds);
567    return bounder->doIRect(ibounds);
568}
569
570// each of these costs 8-bytes of stack space, so don't make it too large
571// must be even for lines/polygon to work
572#define MAX_DEV_PTS     32
573
574void SkDraw::drawPoints(SkCanvas::PointMode mode, size_t count,
575                        const SkPoint pts[], const SkPaint& paint,
576                        bool forceUseDevice) const {
577    // if we're in lines mode, force count to be even
578    if (SkCanvas::kLines_PointMode == mode) {
579        count &= ~(size_t)1;
580    }
581
582    if ((long)count <= 0) {
583        return;
584    }
585
586    SkASSERT(pts != NULL);
587    SkDEBUGCODE(this->validate();)
588
589     // nothing to draw
590    if (fRC->isEmpty()) {
591        return;
592    }
593
594    if (fBounder) {
595        if (!bounder_points(fBounder, mode, count, pts, paint, *fMatrix)) {
596            return;
597        }
598
599        // clear the bounder and call this again, so we don't invoke the bounder
600        // later if we happen to call ourselves for drawRect, drawPath, etc.
601        SkDraw noBounder(*this);
602        noBounder.fBounder = NULL;
603        noBounder.drawPoints(mode, count, pts, paint, forceUseDevice);
604        return;
605    }
606
607    PtProcRec rec;
608    if (!forceUseDevice && rec.init(mode, paint, fMatrix, fRC)) {
609        SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, paint);
610
611        SkPoint             devPts[MAX_DEV_PTS];
612        const SkMatrix*     matrix = fMatrix;
613        SkBlitter*          bltr = blitter.get();
614        PtProcRec::Proc     proc = rec.chooseProc(&bltr);
615        // we have to back up subsequent passes if we're in polygon mode
616        const size_t backup = (SkCanvas::kPolygon_PointMode == mode);
617
618        do {
619            size_t n = count;
620            if (n > MAX_DEV_PTS) {
621                n = MAX_DEV_PTS;
622            }
623            matrix->mapPoints(devPts, pts, n);
624            proc(rec, devPts, n, bltr);
625            pts += n - backup;
626            SkASSERT(count >= n);
627            count -= n;
628            if (count > 0) {
629                count += backup;
630            }
631        } while (count != 0);
632    } else {
633        switch (mode) {
634            case SkCanvas::kPoints_PointMode: {
635                // temporarily mark the paint as filling.
636                SkPaint newPaint(paint);
637                newPaint.setStyle(SkPaint::kFill_Style);
638
639                SkScalar width = newPaint.getStrokeWidth();
640                SkScalar radius = SkScalarHalf(width);
641
642                if (newPaint.getStrokeCap() == SkPaint::kRound_Cap) {
643                    SkPath      path;
644                    SkMatrix    preMatrix;
645
646                    path.addCircle(0, 0, radius);
647                    for (size_t i = 0; i < count; i++) {
648                        preMatrix.setTranslate(pts[i].fX, pts[i].fY);
649                        // pass true for the last point, since we can modify
650                        // then path then
651                        if (fDevice) {
652                            fDevice->drawPath(*this, path, newPaint, &preMatrix,
653                                              (count-1) == i);
654                        } else {
655                            this->drawPath(path, newPaint, &preMatrix,
656                                           (count-1) == i);
657                        }
658                    }
659                } else {
660                    SkRect  r;
661
662                    for (size_t i = 0; i < count; i++) {
663                        r.fLeft = pts[i].fX - radius;
664                        r.fTop = pts[i].fY - radius;
665                        r.fRight = r.fLeft + width;
666                        r.fBottom = r.fTop + width;
667                        if (fDevice) {
668                            fDevice->drawRect(*this, r, newPaint);
669                        } else {
670                            this->drawRect(r, newPaint);
671                        }
672                    }
673                }
674                break;
675            }
676            case SkCanvas::kLines_PointMode:
677#ifndef SK_DISABLE_DASHING_OPTIMIZATION
678                if (2 == count && NULL != paint.getPathEffect()) {
679                    // most likely a dashed line - see if it is one of the ones
680                    // we can accelerate
681                    SkStrokeRec rec(paint);
682                    SkPathEffect::PointData pointData;
683
684                    SkPath path;
685                    path.moveTo(pts[0]);
686                    path.lineTo(pts[1]);
687
688                    SkRect cullRect = SkRect::Make(fRC->getBounds());
689
690                    if (paint.getPathEffect()->asPoints(&pointData, path, rec,
691                                                        *fMatrix, &cullRect)) {
692                        // 'asPoints' managed to find some fast path
693
694                        SkPaint newP(paint);
695                        newP.setPathEffect(NULL);
696                        newP.setStyle(SkPaint::kFill_Style);
697
698                        if (!pointData.fFirst.isEmpty()) {
699                            if (fDevice) {
700                                fDevice->drawPath(*this, pointData.fFirst, newP);
701                            } else {
702                                this->drawPath(pointData.fFirst, newP);
703                            }
704                        }
705
706                        if (!pointData.fLast.isEmpty()) {
707                            if (fDevice) {
708                                fDevice->drawPath(*this, pointData.fLast, newP);
709                            } else {
710                                this->drawPath(pointData.fLast, newP);
711                            }
712                        }
713
714                        if (pointData.fSize.fX == pointData.fSize.fY) {
715                            // The rest of the dashed line can just be drawn as points
716                            SkASSERT(pointData.fSize.fX == SkScalarHalf(newP.getStrokeWidth()));
717
718                            if (SkPathEffect::PointData::kCircles_PointFlag & pointData.fFlags) {
719                                newP.setStrokeCap(SkPaint::kRound_Cap);
720                            } else {
721                                newP.setStrokeCap(SkPaint::kButt_Cap);
722                            }
723
724                            if (fDevice) {
725                                fDevice->drawPoints(*this,
726                                                    SkCanvas::kPoints_PointMode,
727                                                    pointData.fNumPoints,
728                                                    pointData.fPoints,
729                                                    newP);
730                            } else {
731                                this->drawPoints(SkCanvas::kPoints_PointMode,
732                                                 pointData.fNumPoints,
733                                                 pointData.fPoints,
734                                                 newP,
735                                                 forceUseDevice);
736                            }
737                            break;
738                        } else {
739                            // The rest of the dashed line must be drawn as rects
740                            SkASSERT(!(SkPathEffect::PointData::kCircles_PointFlag &
741                                      pointData.fFlags));
742
743                            SkRect r;
744
745                            for (int i = 0; i < pointData.fNumPoints; ++i) {
746                                r.set(pointData.fPoints[i].fX - pointData.fSize.fX,
747                                      pointData.fPoints[i].fY - pointData.fSize.fY,
748                                      pointData.fPoints[i].fX + pointData.fSize.fX,
749                                      pointData.fPoints[i].fY + pointData.fSize.fY);
750                                if (fDevice) {
751                                    fDevice->drawRect(*this, r, newP);
752                                } else {
753                                    this->drawRect(r, newP);
754                                }
755                            }
756                        }
757
758                        break;
759                    }
760                }
761#endif // DISABLE_DASHING_OPTIMIZATION
762                // couldn't take fast path so fall through!
763            case SkCanvas::kPolygon_PointMode: {
764                count -= 1;
765                SkPath path;
766                SkPaint p(paint);
767                p.setStyle(SkPaint::kStroke_Style);
768                size_t inc = (SkCanvas::kLines_PointMode == mode) ? 2 : 1;
769                for (size_t i = 0; i < count; i += inc) {
770                    path.moveTo(pts[i]);
771                    path.lineTo(pts[i+1]);
772                    if (fDevice) {
773                        fDevice->drawPath(*this, path, p, NULL, true);
774                    } else {
775                        this->drawPath(path, p, NULL, true);
776                    }
777                    path.rewind();
778                }
779                break;
780            }
781        }
782    }
783}
784
785static inline SkPoint* as_lefttop(SkRect* r) {
786    return (SkPoint*)(void*)r;
787}
788
789static inline SkPoint* as_rightbottom(SkRect* r) {
790    return ((SkPoint*)(void*)r) + 1;
791}
792
793static bool easy_rect_join(const SkPaint& paint, const SkMatrix& matrix,
794                           SkPoint* strokeSize) {
795    if (SkPaint::kMiter_Join != paint.getStrokeJoin() ||
796        paint.getStrokeMiter() < SK_ScalarSqrt2) {
797        return false;
798    }
799
800    SkASSERT(matrix.rectStaysRect());
801    SkPoint pt = { paint.getStrokeWidth(), paint.getStrokeWidth() };
802    matrix.mapVectors(strokeSize, &pt, 1);
803    strokeSize->fX = SkScalarAbs(strokeSize->fX);
804    strokeSize->fY = SkScalarAbs(strokeSize->fY);
805    return true;
806}
807
808SkDraw::RectType SkDraw::ComputeRectType(const SkPaint& paint,
809                                         const SkMatrix& matrix,
810                                         SkPoint* strokeSize) {
811    RectType rtype;
812    const SkScalar width = paint.getStrokeWidth();
813    const bool zeroWidth = (0 == width);
814    SkPaint::Style style = paint.getStyle();
815
816    if ((SkPaint::kStrokeAndFill_Style == style) && zeroWidth) {
817        style = SkPaint::kFill_Style;
818    }
819
820    if (paint.getPathEffect() || paint.getMaskFilter() ||
821        paint.getRasterizer() || !matrix.rectStaysRect() ||
822        SkPaint::kStrokeAndFill_Style == style) {
823        rtype = kPath_RectType;
824    } else if (SkPaint::kFill_Style == style) {
825        rtype = kFill_RectType;
826    } else if (zeroWidth) {
827        rtype = kHair_RectType;
828    } else if (easy_rect_join(paint, matrix, strokeSize)) {
829        rtype = kStroke_RectType;
830    } else {
831        rtype = kPath_RectType;
832    }
833    return rtype;
834}
835
836static const SkPoint* rect_points(const SkRect& r) {
837    return (const SkPoint*)(void*)&r;
838}
839
840static SkPoint* rect_points(SkRect& r) {
841    return (SkPoint*)(void*)&r;
842}
843
844void SkDraw::drawRect(const SkRect& rect, const SkPaint& paint) const {
845    SkDEBUGCODE(this->validate();)
846
847    // nothing to draw
848    if (fRC->isEmpty()) {
849        return;
850    }
851
852    SkPoint strokeSize;
853    RectType rtype = ComputeRectType(paint, *fMatrix, &strokeSize);
854
855    if (kPath_RectType == rtype) {
856        SkPath  tmp;
857        tmp.addRect(rect);
858        tmp.setFillType(SkPath::kWinding_FillType);
859        this->drawPath(tmp, paint, NULL, true);
860        return;
861    }
862
863    const SkMatrix& matrix = *fMatrix;
864    SkRect          devRect;
865
866    // transform rect into devRect
867    matrix.mapPoints(rect_points(devRect), rect_points(rect), 2);
868    devRect.sort();
869
870    if (fBounder && !fBounder->doRect(devRect, paint)) {
871        return;
872    }
873
874    // look for the quick exit, before we build a blitter
875    if (true) {
876        SkIRect ir;
877        devRect.roundOut(&ir);
878        if (paint.getStyle() != SkPaint::kFill_Style) {
879            // extra space for hairlines
880            ir.inset(-1, -1);
881        }
882        if (fRC->quickReject(ir))
883            return;
884    }
885
886    SkAutoBlitterChoose blitterStorage(*fBitmap, matrix, paint);
887    const SkRasterClip& clip = *fRC;
888    SkBlitter*          blitter = blitterStorage.get();
889
890    // we want to "fill" if we are kFill or kStrokeAndFill, since in the latter
891    // case we are also hairline (if we've gotten to here), which devolves to
892    // effectively just kFill
893    switch (rtype) {
894        case kFill_RectType:
895            if (paint.isAntiAlias()) {
896                SkScan::AntiFillRect(devRect, clip, blitter);
897            } else {
898                SkScan::FillRect(devRect, clip, blitter);
899            }
900            break;
901        case kStroke_RectType:
902            if (paint.isAntiAlias()) {
903                SkScan::AntiFrameRect(devRect, strokeSize, clip, blitter);
904            } else {
905                SkScan::FrameRect(devRect, strokeSize, clip, blitter);
906            }
907            break;
908        case kHair_RectType:
909            if (paint.isAntiAlias()) {
910                SkScan::AntiHairRect(devRect, clip, blitter);
911            } else {
912                SkScan::HairRect(devRect, clip, blitter);
913            }
914            break;
915        default:
916            SkDEBUGFAIL("bad rtype");
917    }
918}
919
920void SkDraw::drawDevMask(const SkMask& srcM, const SkPaint& paint) const {
921    if (srcM.fBounds.isEmpty()) {
922        return;
923    }
924
925    const SkMask* mask = &srcM;
926
927    SkMask dstM;
928    if (paint.getMaskFilter() &&
929            paint.getMaskFilter()->filterMask(&dstM, srcM, *fMatrix, NULL)) {
930        mask = &dstM;
931    } else {
932        dstM.fImage = NULL;
933    }
934    SkAutoMaskFreeImage ami(dstM.fImage);
935
936    if (fBounder && !fBounder->doIRect(mask->fBounds)) {
937        return;
938    }
939
940    SkAutoBlitterChoose blitterChooser(*fBitmap, *fMatrix, paint);
941    SkBlitter* blitter = blitterChooser.get();
942
943    SkAAClipBlitterWrapper wrapper;
944    const SkRegion* clipRgn;
945
946    if (fRC->isBW()) {
947        clipRgn = &fRC->bwRgn();
948    } else {
949        wrapper.init(*fRC, blitter);
950        clipRgn = &wrapper.getRgn();
951        blitter = wrapper.getBlitter();
952    }
953    blitter->blitMaskRegion(*mask, *clipRgn);
954}
955
956static SkScalar fast_len(const SkVector& vec) {
957    SkScalar x = SkScalarAbs(vec.fX);
958    SkScalar y = SkScalarAbs(vec.fY);
959    if (x < y) {
960        SkTSwap(x, y);
961    }
962    return x + SkScalarHalf(y);
963}
964
965static bool xfermodeSupportsCoverageAsAlpha(SkXfermode* xfer) {
966    SkXfermode::Coeff dc;
967    if (!SkXfermode::AsCoeff(xfer, NULL, &dc)) {
968        return false;
969    }
970
971    switch (dc) {
972        case SkXfermode::kOne_Coeff:
973        case SkXfermode::kISA_Coeff:
974        case SkXfermode::kISC_Coeff:
975            return true;
976        default:
977            return false;
978    }
979}
980
981bool SkDrawTreatAsHairline(const SkPaint& paint, const SkMatrix& matrix,
982                           SkScalar* coverage) {
983    SkASSERT(coverage);
984    if (SkPaint::kStroke_Style != paint.getStyle()) {
985        return false;
986    }
987    SkScalar strokeWidth = paint.getStrokeWidth();
988    if (0 == strokeWidth) {
989        *coverage = SK_Scalar1;
990        return true;
991    }
992
993    // if we get here, we need to try to fake a thick-stroke with a modulated
994    // hairline
995
996    if (!paint.isAntiAlias()) {
997        return false;
998    }
999    if (matrix.hasPerspective()) {
1000        return false;
1001    }
1002
1003    SkVector src[2], dst[2];
1004    src[0].set(strokeWidth, 0);
1005    src[1].set(0, strokeWidth);
1006    matrix.mapVectors(dst, src, 2);
1007    SkScalar len0 = fast_len(dst[0]);
1008    SkScalar len1 = fast_len(dst[1]);
1009    if (len0 <= SK_Scalar1 && len1 <= SK_Scalar1) {
1010        *coverage = SkScalarAve(len0, len1);
1011        return true;
1012    }
1013    return false;
1014}
1015
1016void SkDraw::drawPath(const SkPath& origSrcPath, const SkPaint& origPaint,
1017                      const SkMatrix* prePathMatrix, bool pathIsMutable) const {
1018    SkDEBUGCODE(this->validate();)
1019
1020    // nothing to draw
1021    if (fRC->isEmpty()) {
1022        return;
1023    }
1024
1025    SkPath*         pathPtr = (SkPath*)&origSrcPath;
1026    bool            doFill = true;
1027    SkPath          tmpPath;
1028    SkMatrix        tmpMatrix;
1029    const SkMatrix* matrix = fMatrix;
1030
1031    if (prePathMatrix) {
1032        if (origPaint.getPathEffect() || origPaint.getStyle() != SkPaint::kFill_Style ||
1033                origPaint.getRasterizer()) {
1034            SkPath* result = pathPtr;
1035
1036            if (!pathIsMutable) {
1037                result = &tmpPath;
1038                pathIsMutable = true;
1039            }
1040            pathPtr->transform(*prePathMatrix, result);
1041            pathPtr = result;
1042        } else {
1043            if (!tmpMatrix.setConcat(*matrix, *prePathMatrix)) {
1044                // overflow
1045                return;
1046            }
1047            matrix = &tmpMatrix;
1048        }
1049    }
1050    // at this point we're done with prePathMatrix
1051    SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;)
1052
1053    SkTCopyOnFirstWrite<SkPaint> paint(origPaint);
1054
1055    {
1056        SkScalar coverage;
1057        if (SkDrawTreatAsHairline(origPaint, *matrix, &coverage)) {
1058            if (SK_Scalar1 == coverage) {
1059                paint.writable()->setStrokeWidth(0);
1060            } else if (xfermodeSupportsCoverageAsAlpha(origPaint.getXfermode())) {
1061                U8CPU newAlpha;
1062#if 0
1063                newAlpha = SkToU8(SkScalarRoundToInt(coverage *
1064                                                     origPaint.getAlpha()));
1065#else
1066                // this is the old technique, which we preserve for now so
1067                // we don't change previous results (testing)
1068                // the new way seems fine, its just (a tiny bit) different
1069                int scale = (int)SkScalarMul(coverage, 256);
1070                newAlpha = origPaint.getAlpha() * scale >> 8;
1071#endif
1072                SkPaint* writablePaint = paint.writable();
1073                writablePaint->setStrokeWidth(0);
1074                writablePaint->setAlpha(newAlpha);
1075            }
1076        }
1077    }
1078
1079    if (paint->getPathEffect() || paint->getStyle() != SkPaint::kFill_Style) {
1080        SkRect cullRect;
1081        const SkRect* cullRectPtr = NULL;
1082        if (this->computeConservativeLocalClipBounds(&cullRect)) {
1083            cullRectPtr = &cullRect;
1084        }
1085        doFill = paint->getFillPath(*pathPtr, &tmpPath, cullRectPtr);
1086        pathPtr = &tmpPath;
1087    }
1088
1089    if (paint->getRasterizer()) {
1090        SkMask  mask;
1091        if (paint->getRasterizer()->rasterize(*pathPtr, *matrix,
1092                            &fRC->getBounds(), paint->getMaskFilter(), &mask,
1093                            SkMask::kComputeBoundsAndRenderImage_CreateMode)) {
1094            this->drawDevMask(mask, *paint);
1095            SkMask::FreeImage(mask.fImage);
1096        }
1097        return;
1098    }
1099
1100    // avoid possibly allocating a new path in transform if we can
1101    SkPath* devPathPtr = pathIsMutable ? pathPtr : &tmpPath;
1102
1103    // transform the path into device space
1104    pathPtr->transform(*matrix, devPathPtr);
1105
1106    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, *paint);
1107
1108    if (paint->getMaskFilter()) {
1109        SkPaint::Style style = doFill ? SkPaint::kFill_Style :
1110            SkPaint::kStroke_Style;
1111        if (paint->getMaskFilter()->filterPath(*devPathPtr, *fMatrix, *fRC,
1112                                               fBounder, blitter.get(),
1113                                               style)) {
1114            return; // filterPath() called the blitter, so we're done
1115        }
1116    }
1117
1118    if (fBounder && !fBounder->doPath(*devPathPtr, *paint, doFill)) {
1119        return;
1120    }
1121
1122    void (*proc)(const SkPath&, const SkRasterClip&, SkBlitter*);
1123    if (doFill) {
1124        if (paint->isAntiAlias()) {
1125            proc = SkScan::AntiFillPath;
1126        } else {
1127            proc = SkScan::FillPath;
1128        }
1129    } else {    // hairline
1130        if (paint->isAntiAlias()) {
1131            proc = SkScan::AntiHairPath;
1132        } else {
1133            proc = SkScan::HairPath;
1134        }
1135    }
1136    proc(*devPathPtr, *fRC, blitter.get());
1137}
1138
1139/** For the purposes of drawing bitmaps, if a matrix is "almost" translate
1140    go ahead and treat it as if it were, so that subsequent code can go fast.
1141 */
1142static bool just_translate(const SkMatrix& matrix, const SkBitmap& bitmap) {
1143#ifdef SK_IGNORE_TRANS_CLAMP_FIX
1144    SkMatrix::TypeMask mask = matrix.getType();
1145
1146    if (mask & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
1147        return false;
1148    }
1149    if (mask & SkMatrix::kScale_Mask) {
1150        SkScalar sx = matrix[SkMatrix::kMScaleX];
1151        SkScalar sy = matrix[SkMatrix::kMScaleY];
1152        int w = bitmap.width();
1153        int h = bitmap.height();
1154        int sw = SkScalarRound(SkScalarMul(sx, SkIntToScalar(w)));
1155        int sh = SkScalarRound(SkScalarMul(sy, SkIntToScalar(h)));
1156        return sw == w && sh == h;
1157    }
1158    // if we got here, we're either kTranslate_Mask or identity
1159    return true;
1160#else
1161    unsigned bits = 0;  // TODO: find a way to allow the caller to tell us to
1162                        // respect filtering.
1163    return SkTreatAsSprite(matrix, bitmap.width(), bitmap.height(), bits);
1164#endif
1165}
1166
1167void SkDraw::drawBitmapAsMask(const SkBitmap& bitmap,
1168                              const SkPaint& paint) const {
1169    SkASSERT(bitmap.getConfig() == SkBitmap::kA8_Config);
1170
1171    if (just_translate(*fMatrix, bitmap)) {
1172        int ix = SkScalarRound(fMatrix->getTranslateX());
1173        int iy = SkScalarRound(fMatrix->getTranslateY());
1174
1175        SkAutoLockPixels alp(bitmap);
1176        if (!bitmap.readyToDraw()) {
1177            return;
1178        }
1179
1180        SkMask  mask;
1181        mask.fBounds.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
1182        mask.fFormat = SkMask::kA8_Format;
1183        mask.fRowBytes = bitmap.rowBytes();
1184        mask.fImage = bitmap.getAddr8(0, 0);
1185
1186        this->drawDevMask(mask, paint);
1187    } else {    // need to xform the bitmap first
1188        SkRect  r;
1189        SkMask  mask;
1190
1191        r.set(0, 0,
1192              SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
1193        fMatrix->mapRect(&r);
1194        r.round(&mask.fBounds);
1195
1196        // set the mask's bounds to the transformed bitmap-bounds,
1197        // clipped to the actual device
1198        {
1199            SkIRect    devBounds;
1200            devBounds.set(0, 0, fBitmap->width(), fBitmap->height());
1201            // need intersect(l, t, r, b) on irect
1202            if (!mask.fBounds.intersect(devBounds)) {
1203                return;
1204            }
1205        }
1206
1207        mask.fFormat = SkMask::kA8_Format;
1208        mask.fRowBytes = SkAlign4(mask.fBounds.width());
1209        size_t size = mask.computeImageSize();
1210        if (0 == size) {
1211            // the mask is too big to allocated, draw nothing
1212            return;
1213        }
1214
1215        // allocate (and clear) our temp buffer to hold the transformed bitmap
1216        SkAutoMalloc    storage(size);
1217        mask.fImage = (uint8_t*)storage.get();
1218        memset(mask.fImage, 0, size);
1219
1220        // now draw our bitmap(src) into mask(dst), transformed by the matrix
1221        {
1222            SkBitmap    device;
1223            device.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(),
1224                             mask.fBounds.height(), mask.fRowBytes);
1225            device.setPixels(mask.fImage);
1226
1227            SkCanvas c(device);
1228            // need the unclipped top/left for the translate
1229            c.translate(-SkIntToScalar(mask.fBounds.fLeft),
1230                        -SkIntToScalar(mask.fBounds.fTop));
1231            c.concat(*fMatrix);
1232
1233            // We can't call drawBitmap, or we'll infinitely recurse. Instead
1234            // we manually build a shader and draw that into our new mask
1235            SkPaint tmpPaint;
1236            tmpPaint.setFlags(paint.getFlags());
1237            SkAutoBitmapShaderInstall install(bitmap, tmpPaint);
1238            SkRect rr;
1239            rr.set(0, 0, SkIntToScalar(bitmap.width()),
1240                   SkIntToScalar(bitmap.height()));
1241            c.drawRect(rr, install.paintWithShader());
1242        }
1243        this->drawDevMask(mask, paint);
1244    }
1245}
1246
1247static bool clipped_out(const SkMatrix& m, const SkRasterClip& c,
1248                        const SkRect& srcR) {
1249    SkRect  dstR;
1250    SkIRect devIR;
1251
1252    m.mapRect(&dstR, srcR);
1253    dstR.roundOut(&devIR);
1254    return c.quickReject(devIR);
1255}
1256
1257static bool clipped_out(const SkMatrix& matrix, const SkRasterClip& clip,
1258                        int width, int height) {
1259    SkRect  r;
1260    r.set(0, 0, SkIntToScalar(width), SkIntToScalar(height));
1261    return clipped_out(matrix, clip, r);
1262}
1263
1264static bool clipHandlesSprite(const SkRasterClip& clip, int x, int y,
1265                              const SkBitmap& bitmap) {
1266    return clip.isBW() ||
1267           clip.quickContains(x, y, x + bitmap.width(), y + bitmap.height());
1268}
1269
1270void SkDraw::drawBitmap(const SkBitmap& bitmap, const SkMatrix& prematrix,
1271                        const SkPaint& origPaint) const {
1272    SkDEBUGCODE(this->validate();)
1273
1274    // nothing to draw
1275    if (fRC->isEmpty() ||
1276            bitmap.width() == 0 || bitmap.height() == 0 ||
1277            bitmap.getConfig() == SkBitmap::kNo_Config) {
1278        return;
1279    }
1280
1281#ifndef SK_ALLOW_OVER_32K_BITMAPS
1282    // run away on too-big bitmaps for now (exceed 16.16)
1283    if (bitmap.width() > 32767 || bitmap.height() > 32767) {
1284        return;
1285    }
1286#endif
1287
1288    SkPaint paint(origPaint);
1289    paint.setStyle(SkPaint::kFill_Style);
1290
1291    SkMatrix matrix;
1292    if (!matrix.setConcat(*fMatrix, prematrix)) {
1293        return;
1294    }
1295
1296    if (clipped_out(matrix, *fRC, bitmap.width(), bitmap.height())) {
1297        return;
1298    }
1299
1300    if (fBounder && just_translate(matrix, bitmap)) {
1301        SkIRect ir;
1302        int32_t ix = SkScalarRound(matrix.getTranslateX());
1303        int32_t iy = SkScalarRound(matrix.getTranslateY());
1304        ir.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
1305        if (!fBounder->doIRect(ir)) {
1306            return;
1307        }
1308    }
1309
1310    if (bitmap.getConfig() != SkBitmap::kA8_Config &&
1311            just_translate(matrix, bitmap)) {
1312        //
1313        // It is safe to call lock pixels now, since we know the matrix is
1314        // (more or less) identity.
1315        //
1316        SkAutoLockPixels alp(bitmap);
1317        if (!bitmap.readyToDraw()) {
1318            return;
1319        }
1320        int ix = SkScalarRound(matrix.getTranslateX());
1321        int iy = SkScalarRound(matrix.getTranslateY());
1322        if (clipHandlesSprite(*fRC, ix, iy, bitmap)) {
1323            uint32_t    storage[kBlitterStorageLongCount];
1324            SkBlitter*  blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
1325                                                ix, iy, storage, sizeof(storage));
1326            if (blitter) {
1327                SkAutoTPlacementDelete<SkBlitter>   ad(blitter, storage);
1328
1329                SkIRect    ir;
1330                ir.set(ix, iy, ix + bitmap.width(), iy + bitmap.height());
1331
1332                SkScan::FillIRect(ir, *fRC, blitter);
1333                return;
1334            }
1335        }
1336    }
1337
1338    // now make a temp draw on the stack, and use it
1339    //
1340    SkDraw draw(*this);
1341    draw.fMatrix = &matrix;
1342
1343    if (bitmap.getConfig() == SkBitmap::kA8_Config) {
1344        draw.drawBitmapAsMask(bitmap, paint);
1345    } else {
1346        SkAutoBitmapShaderInstall install(bitmap, paint);
1347
1348        SkRect  r;
1349        r.set(0, 0, SkIntToScalar(bitmap.width()),
1350              SkIntToScalar(bitmap.height()));
1351        // is this ok if paint has a rasterizer?
1352        draw.drawRect(r, install.paintWithShader());
1353    }
1354}
1355
1356void SkDraw::drawSprite(const SkBitmap& bitmap, int x, int y,
1357                        const SkPaint& origPaint) const {
1358    SkDEBUGCODE(this->validate();)
1359
1360    // nothing to draw
1361    if (fRC->isEmpty() ||
1362            bitmap.width() == 0 || bitmap.height() == 0 ||
1363            bitmap.getConfig() == SkBitmap::kNo_Config) {
1364        return;
1365    }
1366
1367    SkIRect    bounds;
1368    bounds.set(x, y, x + bitmap.width(), y + bitmap.height());
1369
1370    if (fRC->quickReject(bounds)) {
1371        return; // nothing to draw
1372    }
1373
1374    SkPaint paint(origPaint);
1375    paint.setStyle(SkPaint::kFill_Style);
1376
1377    if (NULL == paint.getColorFilter() && clipHandlesSprite(*fRC, x, y, bitmap)) {
1378        uint32_t    storage[kBlitterStorageLongCount];
1379        SkBlitter*  blitter = SkBlitter::ChooseSprite(*fBitmap, paint, bitmap,
1380                                                x, y, storage, sizeof(storage));
1381
1382        if (blitter) {
1383            SkAutoTPlacementDelete<SkBlitter> ad(blitter, storage);
1384
1385            if (fBounder && !fBounder->doIRect(bounds)) {
1386                return;
1387            }
1388
1389            SkScan::FillIRect(bounds, *fRC, blitter);
1390            return;
1391        }
1392    }
1393
1394    SkAutoBitmapShaderInstall install(bitmap, paint);
1395    const SkPaint& shaderPaint = install.paintWithShader();
1396
1397    SkMatrix        matrix;
1398    SkRect          r;
1399
1400    // get a scalar version of our rect
1401    r.set(bounds);
1402
1403    // tell the shader our offset
1404    matrix.setTranslate(r.fLeft, r.fTop);
1405    shaderPaint.getShader()->setLocalMatrix(matrix);
1406
1407    SkDraw draw(*this);
1408    matrix.reset();
1409    draw.fMatrix = &matrix;
1410    // call ourself with a rect
1411    // is this OK if paint has a rasterizer?
1412    draw.drawRect(r, shaderPaint);
1413}
1414
1415///////////////////////////////////////////////////////////////////////////////
1416
1417#include "SkScalerContext.h"
1418#include "SkGlyphCache.h"
1419#include "SkTextToPathIter.h"
1420#include "SkUtils.h"
1421
1422static void measure_text(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
1423                const char text[], size_t byteLength, SkVector* stopVector) {
1424    SkFixed     x = 0, y = 0;
1425    const char* stop = text + byteLength;
1426
1427    SkAutoKern  autokern;
1428
1429    while (text < stop) {
1430        // don't need x, y here, since all subpixel variants will have the
1431        // same advance
1432        const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
1433
1434        x += autokern.adjust(glyph) + glyph.fAdvanceX;
1435        y += glyph.fAdvanceY;
1436    }
1437    stopVector->set(SkFixedToScalar(x), SkFixedToScalar(y));
1438
1439    SkASSERT(text == stop);
1440}
1441
1442void SkDraw::drawText_asPaths(const char text[], size_t byteLength,
1443                              SkScalar x, SkScalar y,
1444                              const SkPaint& paint) const {
1445    SkDEBUGCODE(this->validate();)
1446
1447    SkTextToPathIter iter(text, byteLength, paint, true);
1448
1449    SkMatrix    matrix;
1450    matrix.setScale(iter.getPathScale(), iter.getPathScale());
1451    matrix.postTranslate(x, y);
1452
1453    const SkPath* iterPath;
1454    SkScalar xpos, prevXPos = 0;
1455
1456    while (iter.next(&iterPath, &xpos)) {
1457        matrix.postTranslate(xpos - prevXPos, 0);
1458        if (iterPath) {
1459            const SkPaint& pnt = iter.getPaint();
1460            if (fDevice) {
1461                fDevice->drawPath(*this, *iterPath, pnt, &matrix, false);
1462            } else {
1463                this->drawPath(*iterPath, pnt, &matrix, false);
1464            }
1465        }
1466        prevXPos = xpos;
1467    }
1468}
1469
1470// disable warning : local variable used without having been initialized
1471#if defined _WIN32 && _MSC_VER >= 1300
1472#pragma warning ( push )
1473#pragma warning ( disable : 4701 )
1474#endif
1475
1476//////////////////////////////////////////////////////////////////////////////
1477
1478static void D1G_NoBounder_RectClip(const SkDraw1Glyph& state,
1479                                   SkFixed fx, SkFixed fy,
1480                                   const SkGlyph& glyph) {
1481    int left = SkFixedFloor(fx);
1482    int top = SkFixedFloor(fy);
1483    SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
1484    SkASSERT(NULL == state.fBounder);
1485    SkASSERT((NULL == state.fClip && state.fAAClip) ||
1486             (state.fClip && NULL == state.fAAClip && state.fClip->isRect()));
1487
1488    left += glyph.fLeft;
1489    top  += glyph.fTop;
1490
1491    int right   = left + glyph.fWidth;
1492    int bottom  = top + glyph.fHeight;
1493
1494    SkMask        mask;
1495    SkIRect        storage;
1496    SkIRect*    bounds = &mask.fBounds;
1497
1498    mask.fBounds.set(left, top, right, bottom);
1499
1500    // this extra test is worth it, assuming that most of the time it succeeds
1501    // since we can avoid writing to storage
1502    if (!state.fClipBounds.containsNoEmptyCheck(left, top, right, bottom)) {
1503        if (!storage.intersectNoEmptyCheck(mask.fBounds, state.fClipBounds))
1504            return;
1505        bounds = &storage;
1506    }
1507
1508    uint8_t* aa = (uint8_t*)glyph.fImage;
1509    if (NULL == aa) {
1510        aa = (uint8_t*)state.fCache->findImage(glyph);
1511        if (NULL == aa) {
1512            return; // can't rasterize glyph
1513        }
1514    }
1515
1516    mask.fRowBytes = glyph.rowBytes();
1517    mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
1518    mask.fImage = aa;
1519    state.fBlitter->blitMask(mask, *bounds);
1520}
1521
1522static void D1G_NoBounder_RgnClip(const SkDraw1Glyph& state,
1523                                  SkFixed fx, SkFixed fy,
1524                                  const SkGlyph& glyph) {
1525    int left = SkFixedFloor(fx);
1526    int top = SkFixedFloor(fy);
1527    SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
1528    SkASSERT(!state.fClip->isRect());
1529    SkASSERT(NULL == state.fBounder);
1530
1531    SkMask  mask;
1532
1533    left += glyph.fLeft;
1534    top  += glyph.fTop;
1535
1536    mask.fBounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight);
1537    SkRegion::Cliperator clipper(*state.fClip, mask.fBounds);
1538
1539    if (!clipper.done()) {
1540        const SkIRect&  cr = clipper.rect();
1541        const uint8_t*  aa = (const uint8_t*)glyph.fImage;
1542        if (NULL == aa) {
1543            aa = (uint8_t*)state.fCache->findImage(glyph);
1544            if (NULL == aa) {
1545                return;
1546            }
1547        }
1548
1549        mask.fRowBytes = glyph.rowBytes();
1550        mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
1551        mask.fImage = (uint8_t*)aa;
1552        do {
1553            state.fBlitter->blitMask(mask, cr);
1554            clipper.next();
1555        } while (!clipper.done());
1556    }
1557}
1558
1559static void D1G_Bounder(const SkDraw1Glyph& state,
1560                        SkFixed fx, SkFixed fy,
1561                        const SkGlyph& glyph) {
1562    int left = SkFixedFloor(fx);
1563    int top = SkFixedFloor(fy);
1564    SkASSERT(glyph.fWidth > 0 && glyph.fHeight > 0);
1565
1566    SkMask  mask;
1567
1568    left += glyph.fLeft;
1569    top  += glyph.fTop;
1570
1571    mask.fBounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight);
1572    SkRegion::Cliperator clipper(*state.fClip, mask.fBounds);
1573
1574    if (!clipper.done()) {
1575        const SkIRect&  cr = clipper.rect();
1576        const uint8_t*  aa = (const uint8_t*)glyph.fImage;
1577        if (NULL == aa) {
1578            aa = (uint8_t*)state.fCache->findImage(glyph);
1579            if (NULL == aa) {
1580                return;
1581            }
1582        }
1583
1584        // we need to pass the origin, which we approximate with our
1585        // (unadjusted) left,top coordinates (the caller called fixedfloor)
1586        if (state.fBounder->doIRectGlyph(cr,
1587                                         left - glyph.fLeft,
1588                                         top - glyph.fTop, glyph)) {
1589            mask.fRowBytes = glyph.rowBytes();
1590            mask.fFormat = static_cast<SkMask::Format>(glyph.fMaskFormat);
1591            mask.fImage = (uint8_t*)aa;
1592            do {
1593                state.fBlitter->blitMask(mask, cr);
1594                clipper.next();
1595            } while (!clipper.done());
1596        }
1597    }
1598}
1599
1600static void D1G_Bounder_AAClip(const SkDraw1Glyph& state,
1601                               SkFixed fx, SkFixed fy,
1602                               const SkGlyph& glyph) {
1603    int left = SkFixedFloor(fx);
1604    int top = SkFixedFloor(fy);
1605    SkIRect bounds;
1606    bounds.set(left, top, left + glyph.fWidth, top + glyph.fHeight);
1607
1608    if (state.fBounder->doIRectGlyph(bounds, left, top, glyph)) {
1609        D1G_NoBounder_RectClip(state, fx, fy, glyph);
1610    }
1611}
1612
1613static bool hasCustomD1GProc(const SkDraw& draw) {
1614    return draw.fProcs && draw.fProcs->fD1GProc;
1615}
1616
1617static bool needsRasterTextBlit(const SkDraw& draw) {
1618    return !hasCustomD1GProc(draw);
1619}
1620
1621SkDraw1Glyph::Proc SkDraw1Glyph::init(const SkDraw* draw, SkBlitter* blitter,
1622                                      SkGlyphCache* cache) {
1623    fDraw = draw;
1624    fBounder = draw->fBounder;
1625    fBlitter = blitter;
1626    fCache = cache;
1627
1628    if (hasCustomD1GProc(*draw)) {
1629        // todo: fix this assumption about clips w/ custom
1630        fClip = draw->fClip;
1631        fClipBounds = fClip->getBounds();
1632        return draw->fProcs->fD1GProc;
1633    }
1634
1635    if (draw->fRC->isBW()) {
1636        fAAClip = NULL;
1637        fClip = &draw->fRC->bwRgn();
1638        fClipBounds = fClip->getBounds();
1639        if (NULL == fBounder) {
1640            if (fClip->isRect()) {
1641                return D1G_NoBounder_RectClip;
1642            } else {
1643                return D1G_NoBounder_RgnClip;
1644            }
1645        } else {
1646            return D1G_Bounder;
1647        }
1648    } else {    // aaclip
1649        fAAClip = &draw->fRC->aaRgn();
1650        fClip = NULL;
1651        fClipBounds = fAAClip->getBounds();
1652        if (NULL == fBounder) {
1653            return D1G_NoBounder_RectClip;
1654        } else {
1655            return D1G_Bounder_AAClip;
1656        }
1657    }
1658}
1659
1660///////////////////////////////////////////////////////////////////////////////
1661
1662void SkDraw::drawText(const char text[], size_t byteLength,
1663                      SkScalar x, SkScalar y, const SkPaint& paint) const {
1664    SkASSERT(byteLength == 0 || text != NULL);
1665
1666    SkDEBUGCODE(this->validate();)
1667
1668    // nothing to draw
1669    if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
1670        return;
1671    }
1672
1673    // SkScalarRec doesn't currently have a way of representing hairline stroke and
1674    // will fill if its frame-width is 0.
1675    if (/*paint.isLinearText() ||*/
1676        (fMatrix->hasPerspective()) ||
1677        (0 == paint.getStrokeWidth() && SkPaint::kStroke_Style == paint.getStyle())) {
1678        this->drawText_asPaths(text, byteLength, x, y, paint);
1679        return;
1680    }
1681
1682    SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();
1683
1684    const SkMatrix* matrix = fMatrix;
1685
1686    SkAutoGlyphCache    autoCache(paint, &fDevice->fLeakyProperties, matrix);
1687    SkGlyphCache*       cache = autoCache.getCache();
1688
1689    // transform our starting point
1690    {
1691        SkPoint loc;
1692        matrix->mapXY(x, y, &loc);
1693        x = loc.fX;
1694        y = loc.fY;
1695    }
1696
1697    // need to measure first
1698    if (paint.getTextAlign() != SkPaint::kLeft_Align) {
1699        SkVector    stop;
1700
1701        measure_text(cache, glyphCacheProc, text, byteLength, &stop);
1702
1703        SkScalar    stopX = stop.fX;
1704        SkScalar    stopY = stop.fY;
1705
1706        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
1707            stopX = SkScalarHalf(stopX);
1708            stopY = SkScalarHalf(stopY);
1709        }
1710        x -= stopX;
1711        y -= stopY;
1712    }
1713
1714    SkFixed fx = SkScalarToFixed(x);
1715    SkFixed fy = SkScalarToFixed(y);
1716    const char* stop = text + byteLength;
1717
1718    SkFixed fxMask = ~0;
1719    SkFixed fyMask = ~0;
1720    if (cache->isSubpixel()) {
1721        SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(*matrix);
1722        if (kX_SkAxisAlignment == baseline) {
1723            fyMask = 0;
1724        } else if (kY_SkAxisAlignment == baseline) {
1725            fxMask = 0;
1726        }
1727
1728    // apply bias here to avoid adding 1/2 the sampling frequency in the loop
1729        fx += SK_FixedHalf >> SkGlyph::kSubBits;
1730        fy += SK_FixedHalf >> SkGlyph::kSubBits;
1731    } else {
1732        fx += SK_FixedHalf;
1733        fy += SK_FixedHalf;
1734    }
1735
1736    SkAAClipBlitter     aaBlitter;
1737    SkAutoBlitterChoose blitterChooser;
1738    SkBlitter*          blitter = NULL;
1739    if (needsRasterTextBlit(*this)) {
1740        blitterChooser.choose(*fBitmap, *matrix, paint);
1741        blitter = blitterChooser.get();
1742        if (fRC->isAA()) {
1743            aaBlitter.init(blitter, &fRC->aaRgn());
1744            blitter = &aaBlitter;
1745        }
1746    }
1747
1748    SkAutoKern          autokern;
1749    SkDraw1Glyph        d1g;
1750    SkDraw1Glyph::Proc  proc = d1g.init(this, blitter, cache);
1751
1752    while (text < stop) {
1753        const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);
1754
1755        fx += autokern.adjust(glyph);
1756
1757        if (glyph.fWidth) {
1758            proc(d1g, fx, fy, glyph);
1759        }
1760        fx += glyph.fAdvanceX;
1761        fy += glyph.fAdvanceY;
1762    }
1763}
1764
1765// last parameter is interpreted as SkFixed [x, y]
1766// return the fixed position, which may be rounded or not by the caller
1767//   e.g. subpixel doesn't round
1768typedef void (*AlignProc)(const SkPoint&, const SkGlyph&, SkIPoint*);
1769
1770static void leftAlignProc(const SkPoint& loc, const SkGlyph& glyph,
1771                          SkIPoint* dst) {
1772    dst->set(SkScalarToFixed(loc.fX), SkScalarToFixed(loc.fY));
1773}
1774
1775static void centerAlignProc(const SkPoint& loc, const SkGlyph& glyph,
1776                            SkIPoint* dst) {
1777    dst->set(SkScalarToFixed(loc.fX) - (glyph.fAdvanceX >> 1),
1778             SkScalarToFixed(loc.fY) - (glyph.fAdvanceY >> 1));
1779}
1780
1781static void rightAlignProc(const SkPoint& loc, const SkGlyph& glyph,
1782                           SkIPoint* dst) {
1783    dst->set(SkScalarToFixed(loc.fX) - glyph.fAdvanceX,
1784             SkScalarToFixed(loc.fY) - glyph.fAdvanceY);
1785}
1786
1787static AlignProc pick_align_proc(SkPaint::Align align) {
1788    static const AlignProc gProcs[] = {
1789        leftAlignProc, centerAlignProc, rightAlignProc
1790    };
1791
1792    SkASSERT((unsigned)align < SK_ARRAY_COUNT(gProcs));
1793
1794    return gProcs[align];
1795}
1796
1797class TextMapState {
1798public:
1799    mutable SkPoint fLoc;
1800
1801    TextMapState(const SkMatrix& matrix, SkScalar y)
1802        : fMatrix(matrix), fProc(matrix.getMapXYProc()), fY(y) {}
1803
1804    typedef void (*Proc)(const TextMapState&, const SkScalar pos[]);
1805
1806    Proc pickProc(int scalarsPerPosition);
1807
1808private:
1809    const SkMatrix&     fMatrix;
1810    SkMatrix::MapXYProc fProc;
1811    SkScalar            fY; // ignored by MapXYProc
1812    // these are only used by Only... procs
1813    SkScalar            fScaleX, fTransX, fTransformedY;
1814
1815    static void MapXProc(const TextMapState& state, const SkScalar pos[]) {
1816        state.fProc(state.fMatrix, *pos, state.fY, &state.fLoc);
1817    }
1818
1819    static void MapXYProc(const TextMapState& state, const SkScalar pos[]) {
1820        state.fProc(state.fMatrix, pos[0], pos[1], &state.fLoc);
1821    }
1822
1823    static void MapOnlyScaleXProc(const TextMapState& state,
1824                                  const SkScalar pos[]) {
1825        state.fLoc.set(SkScalarMul(state.fScaleX, *pos) + state.fTransX,
1826                       state.fTransformedY);
1827    }
1828
1829    static void MapOnlyTransXProc(const TextMapState& state,
1830                                  const SkScalar pos[]) {
1831        state.fLoc.set(*pos + state.fTransX, state.fTransformedY);
1832    }
1833};
1834
1835TextMapState::Proc TextMapState::pickProc(int scalarsPerPosition) {
1836    SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
1837
1838    if (1 == scalarsPerPosition) {
1839        unsigned mtype = fMatrix.getType();
1840        if (mtype & (SkMatrix::kAffine_Mask | SkMatrix::kPerspective_Mask)) {
1841            return MapXProc;
1842        } else {
1843            fScaleX = fMatrix.getScaleX();
1844            fTransX = fMatrix.getTranslateX();
1845            fTransformedY = SkScalarMul(fY, fMatrix.getScaleY()) +
1846                            fMatrix.getTranslateY();
1847            return (mtype & SkMatrix::kScale_Mask) ?
1848                        MapOnlyScaleXProc : MapOnlyTransXProc;
1849        }
1850    } else {
1851        return MapXYProc;
1852    }
1853}
1854
1855//////////////////////////////////////////////////////////////////////////////
1856
1857void SkDraw::drawPosText(const char text[], size_t byteLength,
1858                         const SkScalar pos[], SkScalar constY,
1859                         int scalarsPerPosition, const SkPaint& paint) const {
1860    SkASSERT(byteLength == 0 || text != NULL);
1861    SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition);
1862
1863    SkDEBUGCODE(this->validate();)
1864
1865    // nothing to draw
1866    if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
1867        return;
1868    }
1869
1870    if (/*paint.isLinearText() ||*/
1871        (fMatrix->hasPerspective())) {
1872        // TODO !!!!
1873//      this->drawText_asPaths(text, byteLength, x, y, paint);
1874        return;
1875    }
1876
1877    const SkMatrix* matrix = fMatrix;
1878
1879    SkDrawCacheProc     glyphCacheProc = paint.getDrawCacheProc();
1880    SkAutoGlyphCache    autoCache(paint, &fDevice->fLeakyProperties, matrix);
1881    SkGlyphCache*       cache = autoCache.getCache();
1882
1883    SkAAClipBlitterWrapper wrapper;
1884    SkAutoBlitterChoose blitterChooser;
1885    SkBlitter* blitter = NULL;
1886    if (needsRasterTextBlit(*this)) {
1887        blitterChooser.choose(*fBitmap, *matrix, paint);
1888        blitter = blitterChooser.get();
1889        if (fRC->isAA()) {
1890            wrapper.init(*fRC, blitter);
1891            blitter = wrapper.getBlitter();
1892        }
1893    }
1894
1895    const char*        stop = text + byteLength;
1896    AlignProc          alignProc = pick_align_proc(paint.getTextAlign());
1897    SkDraw1Glyph       d1g;
1898    SkDraw1Glyph::Proc proc = d1g.init(this, blitter, cache);
1899    TextMapState       tms(*matrix, constY);
1900    TextMapState::Proc tmsProc = tms.pickProc(scalarsPerPosition);
1901
1902    if (cache->isSubpixel()) {
1903        // maybe we should skip the rounding if linearText is set
1904        SkAxisAlignment roundBaseline = SkComputeAxisAlignmentForHText(*matrix);
1905
1906        if (SkPaint::kLeft_Align == paint.getTextAlign()) {
1907            while (text < stop) {
1908
1909                tmsProc(tms, pos);
1910
1911                SkFixed fx = SkScalarToFixed(tms.fLoc.fX) + (SK_FixedHalf >> SkGlyph::kSubBits);
1912                SkFixed fy = SkScalarToFixed(tms.fLoc.fY) + (SK_FixedHalf >> SkGlyph::kSubBits);
1913
1914                SkFixed fxMask = ~0;
1915                SkFixed fyMask = ~0;
1916
1917                if (kX_SkAxisAlignment == roundBaseline) {
1918                    fyMask = 0;
1919                } else if (kY_SkAxisAlignment == roundBaseline) {
1920                    fxMask = 0;
1921                }
1922
1923                const SkGlyph& glyph = glyphCacheProc(cache, &text,
1924                                                      fx & fxMask, fy & fyMask);
1925
1926                if (glyph.fWidth) {
1927                    proc(d1g, fx, fy, glyph);
1928                }
1929                pos += scalarsPerPosition;
1930            }
1931        } else {
1932            while (text < stop) {
1933                const char* currentText = text;
1934                const SkGlyph* glyph = &glyphCacheProc(cache, &text, 0, 0);
1935
1936                if (glyph->fWidth) {
1937                    SkDEBUGCODE(SkFixed prevAdvX = glyph->fAdvanceX;)
1938                    SkDEBUGCODE(SkFixed prevAdvY = glyph->fAdvanceY;)
1939
1940                    SkFixed fx, fy;
1941                    SkFixed fxMask = ~0;
1942                    SkFixed fyMask = ~0;
1943                    tmsProc(tms, pos);
1944
1945                    {
1946                        SkIPoint fixedLoc;
1947                        alignProc(tms.fLoc, *glyph, &fixedLoc);
1948                        fx = fixedLoc.fX + (SK_FixedHalf >> SkGlyph::kSubBits);
1949                        fy = fixedLoc.fY + (SK_FixedHalf >> SkGlyph::kSubBits);
1950
1951                        if (kX_SkAxisAlignment == roundBaseline) {
1952                            fyMask = 0;
1953                        } else if (kY_SkAxisAlignment == roundBaseline) {
1954                            fxMask = 0;
1955                        }
1956                    }
1957
1958                    // have to call again, now that we've been "aligned"
1959                    glyph = &glyphCacheProc(cache, &currentText,
1960                                            fx & fxMask, fy & fyMask);
1961                    // the assumption is that the advance hasn't changed
1962                    SkASSERT(prevAdvX == glyph->fAdvanceX);
1963                    SkASSERT(prevAdvY == glyph->fAdvanceY);
1964
1965                    proc(d1g, fx, fy, *glyph);
1966                }
1967                pos += scalarsPerPosition;
1968            }
1969        }
1970    } else {    // not subpixel
1971        if (SkPaint::kLeft_Align == paint.getTextAlign()) {
1972            while (text < stop) {
1973                // the last 2 parameters are ignored
1974                const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
1975
1976                if (glyph.fWidth) {
1977                    tmsProc(tms, pos);
1978
1979                    proc(d1g,
1980                         SkScalarToFixed(tms.fLoc.fX) + SK_FixedHalf,
1981                         SkScalarToFixed(tms.fLoc.fY) + SK_FixedHalf,
1982                         glyph);
1983                }
1984                pos += scalarsPerPosition;
1985            }
1986        } else {
1987            while (text < stop) {
1988                // the last 2 parameters are ignored
1989                const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
1990
1991                if (glyph.fWidth) {
1992                    tmsProc(tms, pos);
1993
1994                    SkIPoint fixedLoc;
1995                    alignProc(tms.fLoc, glyph, &fixedLoc);
1996
1997                    proc(d1g,
1998                         fixedLoc.fX + SK_FixedHalf,
1999                         fixedLoc.fY + SK_FixedHalf,
2000                         glyph);
2001                }
2002                pos += scalarsPerPosition;
2003            }
2004        }
2005    }
2006}
2007
2008#if defined _WIN32 && _MSC_VER >= 1300
2009#pragma warning ( pop )
2010#endif
2011
2012///////////////////////////////////////////////////////////////////////////////
2013
2014#include "SkPathMeasure.h"
2015
2016static void morphpoints(SkPoint dst[], const SkPoint src[], int count,
2017                        SkPathMeasure& meas, const SkMatrix& matrix) {
2018    SkMatrix::MapXYProc proc = matrix.getMapXYProc();
2019
2020    for (int i = 0; i < count; i++) {
2021        SkPoint pos;
2022        SkVector tangent;
2023
2024        proc(matrix, src[i].fX, src[i].fY, &pos);
2025        SkScalar sx = pos.fX;
2026        SkScalar sy = pos.fY;
2027
2028        if (!meas.getPosTan(sx, &pos, &tangent)) {
2029            // set to 0 if the measure failed, so that we just set dst == pos
2030            tangent.set(0, 0);
2031        }
2032
2033        /*  This is the old way (that explains our approach but is way too slow
2034            SkMatrix    matrix;
2035            SkPoint     pt;
2036
2037            pt.set(sx, sy);
2038            matrix.setSinCos(tangent.fY, tangent.fX);
2039            matrix.preTranslate(-sx, 0);
2040            matrix.postTranslate(pos.fX, pos.fY);
2041            matrix.mapPoints(&dst[i], &pt, 1);
2042        */
2043        dst[i].set(pos.fX - SkScalarMul(tangent.fY, sy),
2044                   pos.fY + SkScalarMul(tangent.fX, sy));
2045    }
2046}
2047
2048/*  TODO
2049
2050    Need differentially more subdivisions when the follow-path is curvy. Not sure how to
2051    determine that, but we need it. I guess a cheap answer is let the caller tell us,
2052    but that seems like a cop-out. Another answer is to get Rob Johnson to figure it out.
2053*/
2054static void morphpath(SkPath* dst, const SkPath& src, SkPathMeasure& meas,
2055                      const SkMatrix& matrix) {
2056    SkPath::Iter    iter(src, false);
2057    SkPoint         srcP[4], dstP[3];
2058    SkPath::Verb    verb;
2059
2060    while ((verb = iter.next(srcP)) != SkPath::kDone_Verb) {
2061        switch (verb) {
2062            case SkPath::kMove_Verb:
2063                morphpoints(dstP, srcP, 1, meas, matrix);
2064                dst->moveTo(dstP[0]);
2065                break;
2066            case SkPath::kLine_Verb:
2067                // turn lines into quads to look bendy
2068                srcP[0].fX = SkScalarAve(srcP[0].fX, srcP[1].fX);
2069                srcP[0].fY = SkScalarAve(srcP[0].fY, srcP[1].fY);
2070                morphpoints(dstP, srcP, 2, meas, matrix);
2071                dst->quadTo(dstP[0], dstP[1]);
2072                break;
2073            case SkPath::kQuad_Verb:
2074                morphpoints(dstP, &srcP[1], 2, meas, matrix);
2075                dst->quadTo(dstP[0], dstP[1]);
2076                break;
2077            case SkPath::kCubic_Verb:
2078                morphpoints(dstP, &srcP[1], 3, meas, matrix);
2079                dst->cubicTo(dstP[0], dstP[1], dstP[2]);
2080                break;
2081            case SkPath::kClose_Verb:
2082                dst->close();
2083                break;
2084            default:
2085                SkDEBUGFAIL("unknown verb");
2086                break;
2087        }
2088    }
2089}
2090
2091void SkDraw::drawTextOnPath(const char text[], size_t byteLength,
2092                            const SkPath& follow, const SkMatrix* matrix,
2093                            const SkPaint& paint) const {
2094    SkASSERT(byteLength == 0 || text != NULL);
2095
2096    // nothing to draw
2097    if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
2098        return;
2099    }
2100
2101    SkTextToPathIter    iter(text, byteLength, paint, true);
2102    SkPathMeasure       meas(follow, false);
2103    SkScalar            hOffset = 0;
2104
2105    // need to measure first
2106    if (paint.getTextAlign() != SkPaint::kLeft_Align) {
2107        SkScalar pathLen = meas.getLength();
2108        if (paint.getTextAlign() == SkPaint::kCenter_Align) {
2109            pathLen = SkScalarHalf(pathLen);
2110        }
2111        hOffset += pathLen;
2112    }
2113
2114    const SkPath*   iterPath;
2115    SkScalar        xpos;
2116    SkMatrix        scaledMatrix;
2117    SkScalar        scale = iter.getPathScale();
2118
2119    scaledMatrix.setScale(scale, scale);
2120
2121    while (iter.next(&iterPath, &xpos)) {
2122        if (iterPath) {
2123            SkPath      tmp;
2124            SkMatrix    m(scaledMatrix);
2125
2126            m.postTranslate(xpos + hOffset, 0);
2127            if (matrix) {
2128                m.postConcat(*matrix);
2129            }
2130            morphpath(&tmp, *iterPath, meas, m);
2131            if (fDevice) {
2132                fDevice->drawPath(*this, tmp, iter.getPaint(), NULL, true);
2133            } else {
2134                this->drawPath(tmp, iter.getPaint(), NULL, true);
2135            }
2136        }
2137    }
2138}
2139
2140#ifdef SK_BUILD_FOR_ANDROID
2141void SkDraw::drawPosTextOnPath(const char text[], size_t byteLength,
2142                               const SkPoint pos[], const SkPaint& paint,
2143                               const SkPath& path, const SkMatrix* matrix) const {
2144    // nothing to draw
2145    if (text == NULL || byteLength == 0 || fRC->isEmpty()) {
2146        return;
2147    }
2148
2149    SkMatrix scaledMatrix;
2150    SkPathMeasure meas(path, false);
2151
2152    SkMeasureCacheProc glyphCacheProc = paint.getMeasureCacheProc(
2153            SkPaint::kForward_TextBufferDirection, true);
2154
2155    // Copied (modified) from SkTextToPathIter constructor to setup paint
2156    SkPaint tempPaint(paint);
2157
2158    tempPaint.setLinearText(true);
2159    tempPaint.setMaskFilter(NULL); // don't want this affecting our path-cache lookup
2160
2161    if (tempPaint.getPathEffect() == NULL && !(tempPaint.getStrokeWidth() > 0
2162            && tempPaint.getStyle() != SkPaint::kFill_Style)) {
2163        tempPaint.setStyle(SkPaint::kFill_Style);
2164        tempPaint.setPathEffect(NULL);
2165    }
2166    // End copied from SkTextToPathIter constructor
2167
2168    // detach cache
2169    SkGlyphCache* cache = tempPaint.detachCache(NULL, NULL);
2170
2171    // Must set scale, even if 1
2172    SkScalar scale = SK_Scalar1;
2173    scaledMatrix.setScale(scale, scale);
2174
2175    // Loop over all glyph ids
2176    for (const char* stop = text + byteLength; text < stop; pos++) {
2177
2178        const SkGlyph& glyph = glyphCacheProc(cache, &text);
2179        SkPath tmp;
2180
2181        const SkPath* glyphPath = cache->findPath(glyph);
2182        if (glyphPath == NULL) {
2183            continue;
2184        }
2185
2186        SkMatrix m(scaledMatrix);
2187        m.postTranslate(pos->fX, 0);
2188
2189        if (matrix) {
2190            m.postConcat(*matrix);
2191        }
2192
2193        morphpath(&tmp, *glyphPath, meas, m);
2194        this->drawPath(tmp, tempPaint);
2195
2196    }
2197
2198    // re-attach cache
2199    SkGlyphCache::AttachCache(cache);
2200}
2201#endif
2202
2203///////////////////////////////////////////////////////////////////////////////
2204
2205struct VertState {
2206    int f0, f1, f2;
2207
2208    VertState(int vCount, const uint16_t indices[], int indexCount)
2209            : fIndices(indices) {
2210        fCurrIndex = 0;
2211        if (indices) {
2212            fCount = indexCount;
2213        } else {
2214            fCount = vCount;
2215        }
2216    }
2217
2218    typedef bool (*Proc)(VertState*);
2219    Proc chooseProc(SkCanvas::VertexMode mode);
2220
2221private:
2222    int             fCount;
2223    int             fCurrIndex;
2224    const uint16_t* fIndices;
2225
2226    static bool Triangles(VertState*);
2227    static bool TrianglesX(VertState*);
2228    static bool TriangleStrip(VertState*);
2229    static bool TriangleStripX(VertState*);
2230    static bool TriangleFan(VertState*);
2231    static bool TriangleFanX(VertState*);
2232};
2233
2234bool VertState::Triangles(VertState* state) {
2235    int index = state->fCurrIndex;
2236    if (index + 3 > state->fCount) {
2237        return false;
2238    }
2239    state->f0 = index + 0;
2240    state->f1 = index + 1;
2241    state->f2 = index + 2;
2242    state->fCurrIndex = index + 3;
2243    return true;
2244}
2245
2246bool VertState::TrianglesX(VertState* state) {
2247    const uint16_t* indices = state->fIndices;
2248    int index = state->fCurrIndex;
2249    if (index + 3 > state->fCount) {
2250        return false;
2251    }
2252    state->f0 = indices[index + 0];
2253    state->f1 = indices[index + 1];
2254    state->f2 = indices[index + 2];
2255    state->fCurrIndex = index + 3;
2256    return true;
2257}
2258
2259bool VertState::TriangleStrip(VertState* state) {
2260    int index = state->fCurrIndex;
2261    if (index + 3 > state->fCount) {
2262        return false;
2263    }
2264    state->f2 = index + 2;
2265    if (index & 1) {
2266        state->f0 = index + 1;
2267        state->f1 = index + 0;
2268    } else {
2269        state->f0 = index + 0;
2270        state->f1 = index + 1;
2271    }
2272    state->fCurrIndex = index + 1;
2273    return true;
2274}
2275
2276bool VertState::TriangleStripX(VertState* state) {
2277    const uint16_t* indices = state->fIndices;
2278    int index = state->fCurrIndex;
2279    if (index + 3 > state->fCount) {
2280        return false;
2281    }
2282    state->f2 = indices[index + 2];
2283    if (index & 1) {
2284        state->f0 = indices[index + 1];
2285        state->f1 = indices[index + 0];
2286    } else {
2287        state->f0 = indices[index + 0];
2288        state->f1 = indices[index + 1];
2289    }
2290    state->fCurrIndex = index + 1;
2291    return true;
2292}
2293
2294bool VertState::TriangleFan(VertState* state) {
2295    int index = state->fCurrIndex;
2296    if (index + 3 > state->fCount) {
2297        return false;
2298    }
2299    state->f0 = 0;
2300    state->f1 = index + 1;
2301    state->f2 = index + 2;
2302    state->fCurrIndex = index + 1;
2303    return true;
2304}
2305
2306bool VertState::TriangleFanX(VertState* state) {
2307    const uint16_t* indices = state->fIndices;
2308    int index = state->fCurrIndex;
2309    if (index + 3 > state->fCount) {
2310        return false;
2311    }
2312    state->f0 = indices[0];
2313    state->f1 = indices[index + 1];
2314    state->f2 = indices[index + 2];
2315    state->fCurrIndex = index + 1;
2316    return true;
2317}
2318
2319VertState::Proc VertState::chooseProc(SkCanvas::VertexMode mode) {
2320    switch (mode) {
2321        case SkCanvas::kTriangles_VertexMode:
2322            return fIndices ? TrianglesX : Triangles;
2323        case SkCanvas::kTriangleStrip_VertexMode:
2324            return fIndices ? TriangleStripX : TriangleStrip;
2325        case SkCanvas::kTriangleFan_VertexMode:
2326            return fIndices ? TriangleFanX : TriangleFan;
2327        default:
2328            return NULL;
2329    }
2330}
2331
2332typedef void (*HairProc)(const SkPoint&, const SkPoint&, const SkRasterClip&,
2333                         SkBlitter*);
2334
2335static HairProc ChooseHairProc(bool doAntiAlias) {
2336    return doAntiAlias ? SkScan::AntiHairLine : SkScan::HairLine;
2337}
2338
2339static bool texture_to_matrix(const VertState& state, const SkPoint verts[],
2340                              const SkPoint texs[], SkMatrix* matrix) {
2341    SkPoint src[3], dst[3];
2342
2343    src[0] = texs[state.f0];
2344    src[1] = texs[state.f1];
2345    src[2] = texs[state.f2];
2346    dst[0] = verts[state.f0];
2347    dst[1] = verts[state.f1];
2348    dst[2] = verts[state.f2];
2349    return matrix->setPolyToPoly(src, dst, 3);
2350}
2351
2352class SkTriColorShader : public SkShader {
2353public:
2354    SkTriColorShader() {}
2355
2356    bool setup(const SkPoint pts[], const SkColor colors[], int, int, int);
2357
2358    virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
2359
2360    SK_DEVELOPER_TO_STRING()
2361    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTriColorShader)
2362
2363protected:
2364    SkTriColorShader(SkFlattenableReadBuffer& buffer) : SkShader(buffer) {}
2365
2366private:
2367    SkMatrix    fDstToUnit;
2368    SkPMColor   fColors[3];
2369
2370    typedef SkShader INHERITED;
2371};
2372
2373bool SkTriColorShader::setup(const SkPoint pts[], const SkColor colors[],
2374                             int index0, int index1, int index2) {
2375
2376    fColors[0] = SkPreMultiplyColor(colors[index0]);
2377    fColors[1] = SkPreMultiplyColor(colors[index1]);
2378    fColors[2] = SkPreMultiplyColor(colors[index2]);
2379
2380    SkMatrix m, im;
2381    m.reset();
2382    m.set(0, pts[index1].fX - pts[index0].fX);
2383    m.set(1, pts[index2].fX - pts[index0].fX);
2384    m.set(2, pts[index0].fX);
2385    m.set(3, pts[index1].fY - pts[index0].fY);
2386    m.set(4, pts[index2].fY - pts[index0].fY);
2387    m.set(5, pts[index0].fY);
2388    if (!m.invert(&im)) {
2389        return false;
2390    }
2391    return fDstToUnit.setConcat(im, this->getTotalInverse());
2392}
2393
2394#include "SkColorPriv.h"
2395#include "SkComposeShader.h"
2396
2397static int ScalarTo256(SkScalar v) {
2398    int scale = SkScalarToFixed(v) >> 8;
2399    if (scale < 0) {
2400        scale = 0;
2401    }
2402    if (scale > 255) {
2403        scale = 255;
2404    }
2405    return SkAlpha255To256(scale);
2406}
2407
2408void SkTriColorShader::shadeSpan(int x, int y, SkPMColor dstC[], int count) {
2409    SkPoint src;
2410
2411    for (int i = 0; i < count; i++) {
2412        fDstToUnit.mapXY(SkIntToScalar(x), SkIntToScalar(y), &src);
2413        x += 1;
2414
2415        int scale1 = ScalarTo256(src.fX);
2416        int scale2 = ScalarTo256(src.fY);
2417        int scale0 = 256 - scale1 - scale2;
2418        if (scale0 < 0) {
2419            if (scale1 > scale2) {
2420                scale2 = 256 - scale1;
2421            } else {
2422                scale1 = 256 - scale2;
2423            }
2424            scale0 = 0;
2425        }
2426
2427        dstC[i] = SkAlphaMulQ(fColors[0], scale0) +
2428        SkAlphaMulQ(fColors[1], scale1) +
2429        SkAlphaMulQ(fColors[2], scale2);
2430    }
2431}
2432
2433#ifdef SK_DEVELOPER
2434void SkTriColorShader::toString(SkString* str) const {
2435    str->append("SkTriColorShader: (");
2436
2437    this->INHERITED::toString(str);
2438
2439    str->append(")");
2440}
2441#endif
2442
2443void SkDraw::drawVertices(SkCanvas::VertexMode vmode, int count,
2444                          const SkPoint vertices[], const SkPoint textures[],
2445                          const SkColor colors[], SkXfermode* xmode,
2446                          const uint16_t indices[], int indexCount,
2447                          const SkPaint& paint) const {
2448    SkASSERT(0 == count || NULL != vertices);
2449
2450    // abort early if there is nothing to draw
2451    if (count < 3 || (indices && indexCount < 3) || fRC->isEmpty()) {
2452        return;
2453    }
2454
2455    // transform out vertices into device coordinates
2456    SkAutoSTMalloc<16, SkPoint> storage(count);
2457    SkPoint* devVerts = storage.get();
2458    fMatrix->mapPoints(devVerts, vertices, count);
2459
2460    if (fBounder) {
2461        SkRect bounds;
2462        bounds.set(devVerts, count);
2463        if (!fBounder->doRect(bounds, paint)) {
2464            return;
2465        }
2466    }
2467
2468    /*
2469        We can draw the vertices in 1 of 4 ways:
2470
2471        - solid color (no shader/texture[], no colors[])
2472        - just colors (no shader/texture[], has colors[])
2473        - just texture (has shader/texture[], no colors[])
2474        - colors * texture (has shader/texture[], has colors[])
2475
2476        Thus for texture drawing, we need both texture[] and a shader.
2477    */
2478
2479    SkTriColorShader triShader; // must be above declaration of p
2480    SkPaint p(paint);
2481
2482    SkShader* shader = p.getShader();
2483    if (NULL == shader) {
2484        // if we have no shader, we ignore the texture coordinates
2485        textures = NULL;
2486    } else if (NULL == textures) {
2487        // if we don't have texture coordinates, ignore the shader
2488        p.setShader(NULL);
2489        shader = NULL;
2490    }
2491
2492    // setup the custom shader (if needed)
2493    if (NULL != colors) {
2494        if (NULL == textures) {
2495            // just colors (no texture)
2496            shader = p.setShader(&triShader);
2497        } else {
2498            // colors * texture
2499            SkASSERT(shader);
2500            bool releaseMode = false;
2501            if (NULL == xmode) {
2502                xmode = SkXfermode::Create(SkXfermode::kMultiply_Mode);
2503                releaseMode = true;
2504            }
2505            SkShader* compose = SkNEW_ARGS(SkComposeShader,
2506                                           (&triShader, shader, xmode));
2507            p.setShader(compose)->unref();
2508            if (releaseMode) {
2509                xmode->unref();
2510            }
2511            shader = compose;
2512        }
2513    }
2514
2515    SkAutoBlitterChoose blitter(*fBitmap, *fMatrix, p);
2516    // important that we abort early, as below we may manipulate the shader
2517    // and that is only valid if the shader returned true from setContext.
2518    // If it returned false, then our blitter will be the NullBlitter.
2519    if (blitter->isNullBlitter()) {
2520        return;
2521    }
2522
2523    // setup our state and function pointer for iterating triangles
2524    VertState       state(count, indices, indexCount);
2525    VertState::Proc vertProc = state.chooseProc(vmode);
2526
2527    if (NULL != textures || NULL != colors) {
2528        SkMatrix  tempM;
2529        SkMatrix  savedLocalM;
2530        if (shader) {
2531            savedLocalM = shader->getLocalMatrix();
2532        }
2533
2534        while (vertProc(&state)) {
2535            if (NULL != textures) {
2536                if (texture_to_matrix(state, vertices, textures, &tempM)) {
2537                    tempM.postConcat(savedLocalM);
2538                    shader->setLocalMatrix(tempM);
2539                    // need to recal setContext since we changed the local matrix
2540                    shader->endContext();
2541                    if (!shader->setContext(*fBitmap, p, *fMatrix)) {
2542                        continue;
2543                    }
2544                }
2545            }
2546            if (NULL != colors) {
2547                if (!triShader.setup(vertices, colors,
2548                                     state.f0, state.f1, state.f2)) {
2549                    continue;
2550                }
2551            }
2552
2553            SkPoint tmp[] = {
2554                devVerts[state.f0], devVerts[state.f1], devVerts[state.f2]
2555            };
2556            SkScan::FillTriangle(tmp, *fRC, blitter.get());
2557        }
2558        // now restore the shader's original local matrix
2559        if (NULL != shader) {
2560            shader->setLocalMatrix(savedLocalM);
2561        }
2562    } else {
2563        // no colors[] and no texture
2564        HairProc hairProc = ChooseHairProc(paint.isAntiAlias());
2565        const SkRasterClip& clip = *fRC;
2566        while (vertProc(&state)) {
2567            hairProc(devVerts[state.f0], devVerts[state.f1], clip, blitter.get());
2568            hairProc(devVerts[state.f1], devVerts[state.f2], clip, blitter.get());
2569            hairProc(devVerts[state.f2], devVerts[state.f0], clip, blitter.get());
2570        }
2571    }
2572}
2573
2574///////////////////////////////////////////////////////////////////////////////
2575///////////////////////////////////////////////////////////////////////////////
2576
2577#ifdef SK_DEBUG
2578
2579void SkDraw::validate() const {
2580    SkASSERT(fBitmap != NULL);
2581    SkASSERT(fMatrix != NULL);
2582    SkASSERT(fClip != NULL);
2583    SkASSERT(fRC != NULL);
2584
2585    const SkIRect&  cr = fRC->getBounds();
2586    SkIRect         br;
2587
2588    br.set(0, 0, fBitmap->width(), fBitmap->height());
2589    SkASSERT(cr.isEmpty() || br.contains(cr));
2590}
2591
2592#endif
2593
2594///////////////////////////////////////////////////////////////////////////////
2595
2596SkBounder::SkBounder() {
2597    // initialize up front. This gets reset by SkCanvas before each draw call.
2598    fClip = &SkRegion::GetEmptyRegion();
2599}
2600
2601bool SkBounder::doIRect(const SkIRect& r) {
2602    SkIRect    rr;
2603    return rr.intersect(fClip->getBounds(), r) && this->onIRect(rr);
2604}
2605
2606// TODO: change the prototype to take fixed, and update the callers
2607bool SkBounder::doIRectGlyph(const SkIRect& r, int x, int y,
2608                             const SkGlyph& glyph) {
2609    SkIRect    rr;
2610    if (!rr.intersect(fClip->getBounds(), r)) {
2611        return false;
2612    }
2613    GlyphRec rec;
2614    rec.fLSB.set(SkIntToFixed(x), SkIntToFixed(y));
2615    rec.fRSB.set(rec.fLSB.fX + glyph.fAdvanceX,
2616                 rec.fLSB.fY + glyph.fAdvanceY);
2617    rec.fGlyphID = glyph.getGlyphID();
2618    rec.fFlags = 0;
2619    return this->onIRectGlyph(rr, rec);
2620}
2621
2622bool SkBounder::doHairline(const SkPoint& pt0, const SkPoint& pt1,
2623                           const SkPaint& paint) {
2624    SkIRect     r;
2625    SkScalar    v0, v1;
2626
2627    v0 = pt0.fX;
2628    v1 = pt1.fX;
2629    if (v0 > v1) {
2630        SkTSwap<SkScalar>(v0, v1);
2631    }
2632    r.fLeft     = SkScalarFloor(v0);
2633    r.fRight    = SkScalarCeil(v1);
2634
2635    v0 = pt0.fY;
2636    v1 = pt1.fY;
2637    if (v0 > v1) {
2638        SkTSwap<SkScalar>(v0, v1);
2639    }
2640    r.fTop      = SkScalarFloor(v0);
2641    r.fBottom   = SkScalarCeil(v1);
2642
2643    if (paint.isAntiAlias()) {
2644        r.inset(-1, -1);
2645    }
2646    return this->doIRect(r);
2647}
2648
2649bool SkBounder::doRect(const SkRect& rect, const SkPaint& paint) {
2650    SkIRect    r;
2651
2652    if (paint.getStyle() == SkPaint::kFill_Style) {
2653        rect.round(&r);
2654    } else {
2655        int rad = -1;
2656        rect.roundOut(&r);
2657        if (paint.isAntiAlias()) {
2658            rad = -2;
2659        }
2660        r.inset(rad, rad);
2661    }
2662    return this->doIRect(r);
2663}
2664
2665bool SkBounder::doPath(const SkPath& path, const SkPaint& paint, bool doFill) {
2666    SkIRect       r;
2667    const SkRect& bounds = path.getBounds();
2668
2669    if (doFill) {
2670        bounds.round(&r);
2671    } else {    // hairline
2672        bounds.roundOut(&r);
2673    }
2674
2675    if (paint.isAntiAlias()) {
2676        r.inset(-1, -1);
2677    }
2678    return this->doIRect(r);
2679}
2680
2681void SkBounder::commit() {
2682    // override in subclass
2683}
2684
2685////////////////////////////////////////////////////////////////////////////////////////////////
2686
2687#include "SkPath.h"
2688#include "SkDraw.h"
2689#include "SkRegion.h"
2690#include "SkBlitter.h"
2691
2692static bool compute_bounds(const SkPath& devPath, const SkIRect* clipBounds,
2693                       const SkMaskFilter* filter, const SkMatrix* filterMatrix,
2694                           SkIRect* bounds) {
2695    if (devPath.isEmpty()) {
2696        return false;
2697    }
2698
2699    //  init our bounds from the path
2700    {
2701        SkRect pathBounds = devPath.getBounds();
2702        pathBounds.inset(-SK_ScalarHalf, -SK_ScalarHalf);
2703        pathBounds.roundOut(bounds);
2704    }
2705
2706    SkIPoint margin = SkIPoint::Make(0, 0);
2707    if (filter) {
2708        SkASSERT(filterMatrix);
2709
2710        SkMask srcM, dstM;
2711
2712        srcM.fBounds = *bounds;
2713        srcM.fFormat = SkMask::kA8_Format;
2714        srcM.fImage = NULL;
2715        if (!filter->filterMask(&dstM, srcM, *filterMatrix, &margin)) {
2716            return false;
2717        }
2718    }
2719
2720    // (possibly) trim the bounds to reflect the clip
2721    // (plus whatever slop the filter needs)
2722    if (clipBounds) {
2723        SkIRect tmp = *clipBounds;
2724        // Ugh. Guard against gigantic margins from wacky filters. Without this
2725        // check we can request arbitrary amounts of slop beyond our visible
2726        // clip, and bring down the renderer (at least on finite RAM machines
2727        // like handsets, etc.). Need to balance this invented value between
2728        // quality of large filters like blurs, and the corresponding memory
2729        // requests.
2730        static const int MAX_MARGIN = 128;
2731        tmp.inset(-SkMin32(margin.fX, MAX_MARGIN),
2732                  -SkMin32(margin.fY, MAX_MARGIN));
2733        if (!bounds->intersect(tmp)) {
2734            return false;
2735        }
2736    }
2737
2738    return true;
2739}
2740
2741static void draw_into_mask(const SkMask& mask, const SkPath& devPath,
2742                           SkPaint::Style style) {
2743    SkBitmap        bm;
2744    SkDraw          draw;
2745    SkRasterClip    clip;
2746    SkMatrix        matrix;
2747    SkPaint         paint;
2748
2749    bm.setConfig(SkBitmap::kA8_Config, mask.fBounds.width(), mask.fBounds.height(), mask.fRowBytes);
2750    bm.setPixels(mask.fImage);
2751
2752    clip.setRect(SkIRect::MakeWH(mask.fBounds.width(), mask.fBounds.height()));
2753    matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft),
2754                        -SkIntToScalar(mask.fBounds.fTop));
2755
2756    draw.fBitmap    = &bm;
2757    draw.fRC        = &clip;
2758    draw.fClip      = &clip.bwRgn();
2759    draw.fMatrix    = &matrix;
2760    draw.fBounder   = NULL;
2761    paint.setAntiAlias(true);
2762    paint.setStyle(style);
2763    draw.drawPath(devPath, paint);
2764}
2765
2766bool SkDraw::DrawToMask(const SkPath& devPath, const SkIRect* clipBounds,
2767                        const SkMaskFilter* filter, const SkMatrix* filterMatrix,
2768                        SkMask* mask, SkMask::CreateMode mode,
2769                        SkPaint::Style style) {
2770    if (SkMask::kJustRenderImage_CreateMode != mode) {
2771        if (!compute_bounds(devPath, clipBounds, filter, filterMatrix, &mask->fBounds))
2772            return false;
2773    }
2774
2775    if (SkMask::kComputeBoundsAndRenderImage_CreateMode == mode) {
2776        mask->fFormat = SkMask::kA8_Format;
2777        mask->fRowBytes = mask->fBounds.width();
2778        size_t size = mask->computeImageSize();
2779        if (0 == size) {
2780            // we're too big to allocate the mask, abort
2781            return false;
2782        }
2783        mask->fImage = SkMask::AllocImage(size);
2784        memset(mask->fImage, 0, mask->computeImageSize());
2785    }
2786
2787    if (SkMask::kJustComputeBounds_CreateMode != mode) {
2788        draw_into_mask(*mask, devPath, style);
2789    }
2790
2791    return true;
2792}
2793
2794