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ara-mdk / platform / external / skia / a223e0da1c4693214de7e299e7d4103df917a77f / . / src / core / SkPaint.cpp
blob: fc5e57ccfeabed6380ed607b36e23374d12da093 [file] [log] [blame]
/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <new>
#include "SkPaint.h"
#include "SkColorFilter.h"
#include "SkFontHost.h"
#include "SkImageFilter.h"
#include "SkMaskFilter.h"
#include "SkPathEffect.h"
#include "SkRasterizer.h"
#include "SkShader.h"
#include "SkScalar.h"
#include "SkScalerContext.h"
#include "SkStroke.h"
#include "SkTextFormatParams.h"
#include "SkTypeface.h"
#include "SkXfermode.h"
#include "SkAutoKern.h"
#include "SkGlyphCache.h"
#include "SkPaintDefaults.h"
// define this to get a printf for out-of-range parameter in setters
// e.g. setTextSize(-1)
//#define SK_REPORT_API_RANGE_CHECK
#ifdef SK_BUILD_FOR_ANDROID
#define GEN_ID_INC fGenerationID++
#define GEN_ID_INC_EVAL(expression) if (expression) { fGenerationID++; }
#else
#define GEN_ID_INC
#define GEN_ID_INC_EVAL(expression)
#endif
SkPaint::SkPaint() {
// since we may have padding, we zero everything so that our memcmp() call
// in operator== will work correctly.
// with this, we can skip 0 and null individual initializations
sk_bzero(this, sizeof(*this));
#if 0 // not needed with the bzero call above
fTypeface = NULL;
fTextSkewX = 0;
fPathEffect = NULL;
fShader = NULL;
fXfermode = NULL;
fMaskFilter = NULL;
fColorFilter = NULL;
fRasterizer = NULL;
fLooper = NULL;
fImageFilter = NULL;
fWidth = 0;
#endif
fTextSize = SkPaintDefaults_TextSize;
fTextScaleX = SK_Scalar1;
fColor = SK_ColorBLACK;
fMiterLimit = SkPaintDefaults_MiterLimit;
fFlags = SkPaintDefaults_Flags;
fCapType = kDefault_Cap;
fJoinType = kDefault_Join;
fTextAlign = kLeft_Align;
fStyle = kFill_Style;
fTextEncoding = kUTF8_TextEncoding;
fHinting = SkPaintDefaults_Hinting;
#ifdef SK_BUILD_FOR_ANDROID
new(&fTextLocale) SkString();
fGenerationID = 0;
#endif
}
SkPaint::SkPaint(const SkPaint& src) {
memcpy(this, &src, sizeof(src));
SkSafeRef(fTypeface);
SkSafeRef(fPathEffect);
SkSafeRef(fShader);
SkSafeRef(fXfermode);
SkSafeRef(fMaskFilter);
SkSafeRef(fColorFilter);
SkSafeRef(fRasterizer);
SkSafeRef(fLooper);
SkSafeRef(fImageFilter);
#ifdef SK_BUILD_FOR_ANDROID
new(&fTextLocale) SkString(src.fTextLocale);
#endif
}
SkPaint::~SkPaint() {
SkSafeUnref(fTypeface);
SkSafeUnref(fPathEffect);
SkSafeUnref(fShader);
SkSafeUnref(fXfermode);
SkSafeUnref(fMaskFilter);
SkSafeUnref(fColorFilter);
SkSafeUnref(fRasterizer);
SkSafeUnref(fLooper);
SkSafeUnref(fImageFilter);
}
SkPaint& SkPaint::operator=(const SkPaint& src) {
SkASSERT(&src);
SkSafeRef(src.fTypeface);
SkSafeRef(src.fPathEffect);
SkSafeRef(src.fShader);
SkSafeRef(src.fXfermode);
SkSafeRef(src.fMaskFilter);
SkSafeRef(src.fColorFilter);
SkSafeRef(src.fRasterizer);
SkSafeRef(src.fLooper);
SkSafeRef(src.fImageFilter);
SkSafeUnref(fTypeface);
SkSafeUnref(fPathEffect);
SkSafeUnref(fShader);
SkSafeUnref(fXfermode);
SkSafeUnref(fMaskFilter);
SkSafeUnref(fColorFilter);
SkSafeUnref(fRasterizer);
SkSafeUnref(fLooper);
SkSafeUnref(fImageFilter);
#ifdef SK_BUILD_FOR_ANDROID
fTextLocale.~SkString();
uint32_t oldGenerationID = fGenerationID;
#endif
memcpy(this, &src, sizeof(src));
#ifdef SK_BUILD_FOR_ANDROID
new(&fTextLocale) SkString(src.fTextLocale);
fGenerationID = oldGenerationID + 1;
#endif
return *this;
}
bool operator==(const SkPaint& a, const SkPaint& b) {
#ifdef SK_BUILD_FOR_ANDROID
//assumes that fGenerationID is the last field in the struct
return !memcmp(&a, &b, SK_OFFSETOF(SkPaint, fGenerationID));
#else
return !memcmp(&a, &b, sizeof(a));
#endif
}
void SkPaint::reset() {
SkPaint init;
#ifdef SK_BUILD_FOR_ANDROID
uint32_t oldGenerationID = fGenerationID;
#endif
*this = init;
#ifdef SK_BUILD_FOR_ANDROID
fGenerationID = oldGenerationID + 1;
#endif
}
#ifdef SK_BUILD_FOR_ANDROID
uint32_t SkPaint::getGenerationID() const {
return fGenerationID;
}
#endif
#ifdef SK_BUILD_FOR_ANDROID
unsigned SkPaint::getBaseGlyphCount(SkUnichar text) const {
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
return cache->getBaseGlyphCount(text);
}
#endif
void SkPaint::setHinting(Hinting hintingLevel) {
GEN_ID_INC_EVAL((unsigned) hintingLevel != fHinting);
fHinting = hintingLevel;
}
void SkPaint::setFlags(uint32_t flags) {
GEN_ID_INC_EVAL(fFlags != flags);
fFlags = flags;
}
void SkPaint::setAntiAlias(bool doAA) {
GEN_ID_INC_EVAL(doAA != isAntiAlias());
this->setFlags(SkSetClearMask(fFlags, doAA, kAntiAlias_Flag));
}
void SkPaint::setDither(bool doDither) {
GEN_ID_INC_EVAL(doDither != isDither());
this->setFlags(SkSetClearMask(fFlags, doDither, kDither_Flag));
}
void SkPaint::setSubpixelText(bool doSubpixel) {
GEN_ID_INC_EVAL(doSubpixel != isSubpixelText());
this->setFlags(SkSetClearMask(fFlags, doSubpixel, kSubpixelText_Flag));
}
void SkPaint::setLCDRenderText(bool doLCDRender) {
GEN_ID_INC_EVAL(doLCDRender != isLCDRenderText());
this->setFlags(SkSetClearMask(fFlags, doLCDRender, kLCDRenderText_Flag));
}
void SkPaint::setEmbeddedBitmapText(bool doEmbeddedBitmapText) {
GEN_ID_INC_EVAL(doEmbeddedBitmapText != isEmbeddedBitmapText());
this->setFlags(SkSetClearMask(fFlags, doEmbeddedBitmapText, kEmbeddedBitmapText_Flag));
}
void SkPaint::setAutohinted(bool useAutohinter) {
GEN_ID_INC_EVAL(useAutohinter != isAutohinted());
this->setFlags(SkSetClearMask(fFlags, useAutohinter, kAutoHinting_Flag));
}
void SkPaint::setLinearText(bool doLinearText) {
GEN_ID_INC_EVAL(doLinearText != isLinearText());
this->setFlags(SkSetClearMask(fFlags, doLinearText, kLinearText_Flag));
}
void SkPaint::setVerticalText(bool doVertical) {
GEN_ID_INC_EVAL(doVertical != isVerticalText());
this->setFlags(SkSetClearMask(fFlags, doVertical, kVerticalText_Flag));
}
void SkPaint::setUnderlineText(bool doUnderline) {
GEN_ID_INC_EVAL(doUnderline != isUnderlineText());
this->setFlags(SkSetClearMask(fFlags, doUnderline, kUnderlineText_Flag));
}
void SkPaint::setStrikeThruText(bool doStrikeThru) {
GEN_ID_INC_EVAL(doStrikeThru != isStrikeThruText());
this->setFlags(SkSetClearMask(fFlags, doStrikeThru, kStrikeThruText_Flag));
}
void SkPaint::setFakeBoldText(bool doFakeBold) {
GEN_ID_INC_EVAL(doFakeBold != isFakeBoldText());
this->setFlags(SkSetClearMask(fFlags, doFakeBold, kFakeBoldText_Flag));
}
void SkPaint::setDevKernText(bool doDevKern) {
GEN_ID_INC_EVAL(doDevKern != isDevKernText());
this->setFlags(SkSetClearMask(fFlags, doDevKern, kDevKernText_Flag));
}
void SkPaint::setFilterBitmap(bool doFilter) {
GEN_ID_INC_EVAL(doFilter != isFilterBitmap());
this->setFlags(SkSetClearMask(fFlags, doFilter, kFilterBitmap_Flag));
}
void SkPaint::setStyle(Style style) {
if ((unsigned)style < kStyleCount) {
GEN_ID_INC_EVAL((unsigned)style != fStyle);
fStyle = style;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStyle(%d) out of range\n", style);
#endif
}
}
void SkPaint::setColor(SkColor color) {
GEN_ID_INC_EVAL(color != fColor);
fColor = color;
}
void SkPaint::setAlpha(U8CPU a) {
this->setColor(SkColorSetARGB(a, SkColorGetR(fColor),
SkColorGetG(fColor), SkColorGetB(fColor)));
}
void SkPaint::setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) {
this->setColor(SkColorSetARGB(a, r, g, b));
}
void SkPaint::setStrokeWidth(SkScalar width) {
if (width >= 0) {
GEN_ID_INC_EVAL(width != fWidth);
fWidth = width;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeWidth() called with negative value\n");
#endif
}
}
void SkPaint::setStrokeMiter(SkScalar limit) {
if (limit >= 0) {
GEN_ID_INC_EVAL(limit != fMiterLimit);
fMiterLimit = limit;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeMiter() called with negative value\n");
#endif
}
}
void SkPaint::setStrokeCap(Cap ct) {
if ((unsigned)ct < kCapCount) {
GEN_ID_INC_EVAL((unsigned)ct != fCapType);
fCapType = SkToU8(ct);
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeCap(%d) out of range\n", ct);
#endif
}
}
void SkPaint::setStrokeJoin(Join jt) {
if ((unsigned)jt < kJoinCount) {
GEN_ID_INC_EVAL((unsigned)jt != fJoinType);
fJoinType = SkToU8(jt);
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setStrokeJoin(%d) out of range\n", jt);
#endif
}
}
///////////////////////////////////////////////////////////////////////////////
void SkPaint::setTextAlign(Align align) {
if ((unsigned)align < kAlignCount) {
GEN_ID_INC_EVAL((unsigned)align != fTextAlign);
fTextAlign = SkToU8(align);
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setTextAlign(%d) out of range\n", align);
#endif
}
}
void SkPaint::setTextSize(SkScalar ts) {
if (ts >= 0) {
GEN_ID_INC_EVAL(ts != fTextSize);
fTextSize = ts;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setTextSize() called with negative value\n");
#endif
}
}
void SkPaint::setTextScaleX(SkScalar scaleX) {
GEN_ID_INC_EVAL(scaleX != fTextScaleX);
fTextScaleX = scaleX;
}
void SkPaint::setTextSkewX(SkScalar skewX) {
GEN_ID_INC_EVAL(skewX != fTextSkewX);
fTextSkewX = skewX;
}
void SkPaint::setTextEncoding(TextEncoding encoding) {
if ((unsigned)encoding <= kGlyphID_TextEncoding) {
GEN_ID_INC_EVAL((unsigned)encoding != fTextEncoding);
fTextEncoding = encoding;
} else {
#ifdef SK_REPORT_API_RANGE_CHECK
SkDebugf("SkPaint::setTextEncoding(%d) out of range\n", encoding);
#endif
}
}
#ifdef SK_BUILD_FOR_ANDROID
void SkPaint::setTextLocale(const SkString& locale) {
if(!fTextLocale.equals(locale)) {
fTextLocale.set(locale);
GEN_ID_INC;
}
}
void SkPaint::setLanguage(const SkLanguage& language) {
setTextLocale(SkString(language.getTag()));
}
#endif
///////////////////////////////////////////////////////////////////////////////
SkTypeface* SkPaint::setTypeface(SkTypeface* font) {
SkRefCnt_SafeAssign(fTypeface, font);
GEN_ID_INC;
return font;
}
SkRasterizer* SkPaint::setRasterizer(SkRasterizer* r) {
SkRefCnt_SafeAssign(fRasterizer, r);
GEN_ID_INC;
return r;
}
SkDrawLooper* SkPaint::setLooper(SkDrawLooper* looper) {
SkRefCnt_SafeAssign(fLooper, looper);
GEN_ID_INC;
return looper;
}
SkImageFilter* SkPaint::setImageFilter(SkImageFilter* imageFilter) {
SkRefCnt_SafeAssign(fImageFilter, imageFilter);
GEN_ID_INC;
return imageFilter;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkGlyphCache.h"
#include "SkUtils.h"
static void DetachDescProc(const SkDescriptor* desc, void* context) {
*((SkGlyphCache**)context) = SkGlyphCache::DetachCache(desc);
}
#ifdef SK_BUILD_FOR_ANDROID
const SkGlyph& SkPaint::getUnicharMetrics(SkUnichar text) {
SkGlyphCache* cache;
descriptorProc(NULL, DetachDescProc, &cache, true);
const SkGlyph& glyph = cache->getUnicharMetrics(text);
SkGlyphCache::AttachCache(cache);
return glyph;
}
const SkGlyph& SkPaint::getGlyphMetrics(uint16_t glyphId) {
SkGlyphCache* cache;
descriptorProc(NULL, DetachDescProc, &cache, true);
const SkGlyph& glyph = cache->getGlyphIDMetrics(glyphId);
SkGlyphCache::AttachCache(cache);
return glyph;
}
const void* SkPaint::findImage(const SkGlyph& glyph) {
// See ::detachCache()
SkGlyphCache* cache;
descriptorProc(NULL, DetachDescProc, &cache, true);
const void* image = cache->findImage(glyph);
SkGlyphCache::AttachCache(cache);
return image;
}
int SkPaint::utfToGlyphs(const void* textData, TextEncoding encoding,
size_t byteLength, uint16_t glyphs[]) const {
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
const char* text = (const char*) textData;
const char* stop = text + byteLength;
uint16_t* gptr = glyphs;
switch (encoding) {
case SkPaint::kUTF8_TextEncoding:
while (text < stop) {
*gptr++ = cache->unicharToGlyph(SkUTF8_NextUnichar(&text));
}
break;
case SkPaint::kUTF16_TextEncoding: {
const uint16_t* text16 = (const uint16_t*)text;
const uint16_t* stop16 = (const uint16_t*)stop;
while (text16 < stop16) {
*gptr++ = cache->unicharToGlyph(SkUTF16_NextUnichar(&text16));
}
break;
}
default:
SkDEBUGFAIL("unknown text encoding");
}
return gptr - glyphs;
}
#endif
int SkPaint::textToGlyphs(const void* textData, size_t byteLength,
uint16_t glyphs[]) const {
if (byteLength == 0) {
return 0;
}
SkASSERT(textData != NULL);
if (NULL == glyphs) {
switch (this->getTextEncoding()) {
case kUTF8_TextEncoding:
return SkUTF8_CountUnichars((const char*)textData, byteLength);
case kUTF16_TextEncoding:
return SkUTF16_CountUnichars((const uint16_t*)textData,
byteLength >> 1);
case kGlyphID_TextEncoding:
return byteLength >> 1;
default:
SkDEBUGFAIL("unknown text encoding");
}
return 0;
}
// if we get here, we have a valid glyphs[] array, so time to fill it in
// handle this encoding before the setup for the glyphcache
if (this->getTextEncoding() == kGlyphID_TextEncoding) {
// we want to ignore the low bit of byteLength
memcpy(glyphs, textData, byteLength >> 1 << 1);
return byteLength >> 1;
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
const char* text = (const char*)textData;
const char* stop = text + byteLength;
uint16_t* gptr = glyphs;
switch (this->getTextEncoding()) {
case SkPaint::kUTF8_TextEncoding:
while (text < stop) {
*gptr++ = cache->unicharToGlyph(SkUTF8_NextUnichar(&text));
}
break;
case SkPaint::kUTF16_TextEncoding: {
const uint16_t* text16 = (const uint16_t*)text;
const uint16_t* stop16 = (const uint16_t*)stop;
while (text16 < stop16) {
*gptr++ = cache->unicharToGlyph(SkUTF16_NextUnichar(&text16));
}
break;
}
default:
SkDEBUGFAIL("unknown text encoding");
}
return gptr - glyphs;
}
bool SkPaint::containsText(const void* textData, size_t byteLength) const {
if (0 == byteLength) {
return true;
}
SkASSERT(textData != NULL);
// handle this encoding before the setup for the glyphcache
if (this->getTextEncoding() == kGlyphID_TextEncoding) {
const uint16_t* glyphID = static_cast<const uint16_t*>(textData);
size_t count = byteLength >> 1;
for (size_t i = 0; i < count; i++) {
if (0 == glyphID[i]) {
return false;
}
}
return true;
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
switch (this->getTextEncoding()) {
case SkPaint::kUTF8_TextEncoding: {
const char* text = static_cast<const char*>(textData);
const char* stop = text + byteLength;
while (text < stop) {
if (0 == cache->unicharToGlyph(SkUTF8_NextUnichar(&text))) {
return false;
}
}
break;
}
case SkPaint::kUTF16_TextEncoding: {
const uint16_t* text = static_cast<const uint16_t*>(textData);
const uint16_t* stop = text + (byteLength >> 1);
while (text < stop) {
if (0 == cache->unicharToGlyph(SkUTF16_NextUnichar(&text))) {
return false;
}
}
break;
}
default:
SkDEBUGFAIL("unknown text encoding");
return false;
}
return true;
}
void SkPaint::glyphsToUnichars(const uint16_t glyphs[], int count,
SkUnichar textData[]) const {
if (count <= 0) {
return;
}
SkASSERT(glyphs != NULL);
SkASSERT(textData != NULL);
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
for (int index = 0; index < count; index++) {
textData[index] = cache->glyphToUnichar(glyphs[index]);
}
}
///////////////////////////////////////////////////////////////////////////////
static const SkGlyph& sk_getMetrics_utf8_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getMetrics_utf8_prev(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_PrevUnichar(text));
}
static const SkGlyph& sk_getMetrics_utf16_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getMetrics_utf16_prev(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_PrevUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getMetrics_glyph_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID);
}
static const SkGlyph& sk_getMetrics_glyph_prev(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
ptr -= 1;
unsigned glyphID = *ptr;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID);
}
static const SkGlyph& sk_getAdvance_utf8_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getAdvance_utf8_prev(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF8_PrevUnichar(text));
}
static const SkGlyph& sk_getAdvance_utf16_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getAdvance_utf16_prev(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharAdvance(SkUTF16_PrevUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getAdvance_glyph_next(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDAdvance(glyphID);
}
static const SkGlyph& sk_getAdvance_glyph_prev(SkGlyphCache* cache,
const char** text) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
ptr -= 1;
unsigned glyphID = *ptr;
*text = (const char*)ptr;
return cache->getGlyphIDAdvance(glyphID);
}
SkMeasureCacheProc SkPaint::getMeasureCacheProc(TextBufferDirection tbd,
bool needFullMetrics) const {
static const SkMeasureCacheProc gMeasureCacheProcs[] = {
sk_getMetrics_utf8_next,
sk_getMetrics_utf16_next,
sk_getMetrics_glyph_next,
sk_getMetrics_utf8_prev,
sk_getMetrics_utf16_prev,
sk_getMetrics_glyph_prev,
sk_getAdvance_utf8_next,
sk_getAdvance_utf16_next,
sk_getAdvance_glyph_next,
sk_getAdvance_utf8_prev,
sk_getAdvance_utf16_prev,
sk_getAdvance_glyph_prev
};
unsigned index = this->getTextEncoding();
if (kBackward_TextBufferDirection == tbd) {
index += 3;
}
if (!needFullMetrics && !this->isDevKernText()) {
index += 6;
}
SkASSERT(index < SK_ARRAY_COUNT(gMeasureCacheProcs));
return gMeasureCacheProcs[index];
}
///////////////////////////////////////////////////////////////////////////////
static const SkGlyph& sk_getMetrics_utf8_00(SkGlyphCache* cache,
const char** text, SkFixed, SkFixed) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_NextUnichar(text));
}
static const SkGlyph& sk_getMetrics_utf8_xy(SkGlyphCache* cache,
const char** text, SkFixed x, SkFixed y) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF8_NextUnichar(text), x, y);
}
static const SkGlyph& sk_getMetrics_utf16_00(SkGlyphCache* cache,
const char** text, SkFixed, SkFixed) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text));
}
static const SkGlyph& sk_getMetrics_utf16_xy(SkGlyphCache* cache,
const char** text, SkFixed x, SkFixed y) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
return cache->getUnicharMetrics(SkUTF16_NextUnichar((const uint16_t**)text),
x, y);
}
static const SkGlyph& sk_getMetrics_glyph_00(SkGlyphCache* cache,
const char** text, SkFixed, SkFixed) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID);
}
static const SkGlyph& sk_getMetrics_glyph_xy(SkGlyphCache* cache,
const char** text, SkFixed x, SkFixed y) {
SkASSERT(cache != NULL);
SkASSERT(text != NULL);
const uint16_t* ptr = *(const uint16_t**)text;
unsigned glyphID = *ptr;
ptr += 1;
*text = (const char*)ptr;
return cache->getGlyphIDMetrics(glyphID, x, y);
}
SkDrawCacheProc SkPaint::getDrawCacheProc() const {
static const SkDrawCacheProc gDrawCacheProcs[] = {
sk_getMetrics_utf8_00,
sk_getMetrics_utf16_00,
sk_getMetrics_glyph_00,
sk_getMetrics_utf8_xy,
sk_getMetrics_utf16_xy,
sk_getMetrics_glyph_xy
};
unsigned index = this->getTextEncoding();
if (fFlags & kSubpixelText_Flag) {
index += 3;
}
SkASSERT(index < SK_ARRAY_COUNT(gDrawCacheProcs));
return gDrawCacheProcs[index];
}
///////////////////////////////////////////////////////////////////////////////
class SkAutoRestorePaintTextSizeAndFrame {
public:
SkAutoRestorePaintTextSizeAndFrame(const SkPaint* paint)
: fPaint((SkPaint*)paint) {
fTextSize = paint->getTextSize();
fStyle = paint->getStyle();
fPaint->setStyle(SkPaint::kFill_Style);
}
~SkAutoRestorePaintTextSizeAndFrame() {
fPaint->setStyle(fStyle);
fPaint->setTextSize(fTextSize);
}
private:
SkPaint* fPaint;
SkScalar fTextSize;
SkPaint::Style fStyle;
};
static void set_bounds(const SkGlyph& g, SkRect* bounds) {
bounds->set(SkIntToScalar(g.fLeft),
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth),
SkIntToScalar(g.fTop + g.fHeight));
}
// 64bits wide, with a 16bit bias. Useful when accumulating lots of 16.16 so
// we don't overflow along the way
typedef int64_t Sk48Dot16;
#ifdef SK_SCALAR_IS_FLOAT
static inline float Sk48Dot16ToScalar(Sk48Dot16 x) {
return (float) (x * 1.5258789e-5); // x * (1 / 65536.0f)
}
#else
static inline SkFixed Sk48Dot16ToScalar(Sk48Dot16 x) {
// just return the low 32bits
return static_cast<SkFixed>(x);
}
#endif
static void join_bounds_x(const SkGlyph& g, SkRect* bounds, Sk48Dot16 dx) {
SkScalar sx = Sk48Dot16ToScalar(dx);
bounds->join(SkIntToScalar(g.fLeft) + sx,
SkIntToScalar(g.fTop),
SkIntToScalar(g.fLeft + g.fWidth) + sx,
SkIntToScalar(g.fTop + g.fHeight));
}
static void join_bounds_y(const SkGlyph& g, SkRect* bounds, Sk48Dot16 dy) {
SkScalar sy = Sk48Dot16ToScalar(dy);
bounds->join(SkIntToScalar(g.fLeft),
SkIntToScalar(g.fTop) + sy,
SkIntToScalar(g.fLeft + g.fWidth),
SkIntToScalar(g.fTop + g.fHeight) + sy);
}
typedef void (*JoinBoundsProc)(const SkGlyph&, SkRect*, Sk48Dot16);
// xyIndex is 0 for fAdvanceX or 1 for fAdvanceY
static SkFixed advance(const SkGlyph& glyph, int xyIndex) {
SkASSERT(0 == xyIndex || 1 == xyIndex);
return (&glyph.fAdvanceX)[xyIndex];
}
SkScalar SkPaint::measure_text(SkGlyphCache* cache,
const char* text, size_t byteLength,
int* count, SkRect* bounds) const {
SkASSERT(count);
if (byteLength == 0) {
*count = 0;
if (bounds) {
bounds->setEmpty();
}
return 0;
}
SkMeasureCacheProc glyphCacheProc;
glyphCacheProc = this->getMeasureCacheProc(kForward_TextBufferDirection,
NULL != bounds);
int xyIndex;
JoinBoundsProc joinBoundsProc;
if (this->isVerticalText()) {
xyIndex = 1;
joinBoundsProc = join_bounds_y;
} else {
xyIndex = 0;
joinBoundsProc = join_bounds_x;
}
int n = 1;
const char* stop = (const char*)text + byteLength;
const SkGlyph* g = &glyphCacheProc(cache, &text);
// our accumulated fixed-point advances might overflow 16.16, so we use
// a 48.16 (64bit) accumulator, and then convert that to scalar at the
// very end.
Sk48Dot16 x = advance(*g, xyIndex);
SkAutoKern autokern;
if (NULL == bounds) {
if (this->isDevKernText()) {
int rsb;
for (; text < stop; n++) {
rsb = g->fRsbDelta;
g = &glyphCacheProc(cache, &text);
x += SkAutoKern_AdjustF(rsb, g->fLsbDelta) + advance(*g, xyIndex);
}
} else {
for (; text < stop; n++) {
x += advance(glyphCacheProc(cache, &text), xyIndex);
}
}
} else {
set_bounds(*g, bounds);
if (this->isDevKernText()) {
int rsb;
for (; text < stop; n++) {
rsb = g->fRsbDelta;
g = &glyphCacheProc(cache, &text);
x += SkAutoKern_AdjustF(rsb, g->fLsbDelta);
joinBoundsProc(*g, bounds, x);
x += advance(*g, xyIndex);
}
} else {
for (; text < stop; n++) {
g = &glyphCacheProc(cache, &text);
joinBoundsProc(*g, bounds, x);
x += advance(*g, xyIndex);
}
}
}
SkASSERT(text == stop);
*count = n;
return Sk48Dot16ToScalar(x);
}
SkScalar SkPaint::measureText(const void* textData, size_t length,
SkRect* bounds, SkScalar zoom) const {
const char* text = (const char*)textData;
SkASSERT(text != NULL || length == 0);
SkScalar scale = 0;
SkAutoRestorePaintTextSizeAndFrame restore(this);
if (this->isLinearText()) {
scale = fTextSize / kCanonicalTextSizeForPaths;
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkMatrix zoomMatrix, *zoomPtr = NULL;
if (zoom) {
zoomMatrix.setScale(zoom, zoom);
zoomPtr = &zoomMatrix;
}
SkAutoGlyphCache autoCache(*this, zoomPtr);
SkGlyphCache* cache = autoCache.getCache();
SkScalar width = 0;
if (length > 0) {
int tempCount;
width = this->measure_text(cache, text, length, &tempCount, bounds);
if (scale) {
width = SkScalarMul(width, scale);
if (bounds) {
bounds->fLeft = SkScalarMul(bounds->fLeft, scale);
bounds->fTop = SkScalarMul(bounds->fTop, scale);
bounds->fRight = SkScalarMul(bounds->fRight, scale);
bounds->fBottom = SkScalarMul(bounds->fBottom, scale);
}
}
}
return width;
}
typedef bool (*SkTextBufferPred)(const char* text, const char* stop);
static bool forward_textBufferPred(const char* text, const char* stop) {
return text < stop;
}
static bool backward_textBufferPred(const char* text, const char* stop) {
return text > stop;
}
static SkTextBufferPred chooseTextBufferPred(SkPaint::TextBufferDirection tbd,
const char** text, size_t length,
const char** stop) {
if (SkPaint::kForward_TextBufferDirection == tbd) {
*stop = *text + length;
return forward_textBufferPred;
} else {
// text should point to the end of the buffer, and stop to the beginning
*stop = *text;
*text += length;
return backward_textBufferPred;
}
}
size_t SkPaint::breakText(const void* textD, size_t length, SkScalar maxWidth,
SkScalar* measuredWidth,
TextBufferDirection tbd) const {
if (0 == length || 0 >= maxWidth) {
if (measuredWidth) {
*measuredWidth = 0;
}
return 0;
}
if (0 == fTextSize) {
if (measuredWidth) {
*measuredWidth = 0;
}
return length;
}
SkASSERT(textD != NULL);
const char* text = (const char*)textD;
SkScalar scale = 0;
SkAutoRestorePaintTextSizeAndFrame restore(this);
if (this->isLinearText()) {
scale = fTextSize / kCanonicalTextSizeForPaths;
maxWidth = SkScalarMulDiv(maxWidth, kCanonicalTextSizeForPaths, fTextSize);
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
SkMeasureCacheProc glyphCacheProc = this->getMeasureCacheProc(tbd, false);
const char* stop;
SkTextBufferPred pred = chooseTextBufferPred(tbd, &text, length, &stop);
const int xyIndex = this->isVerticalText() ? 1 : 0;
// use 64bits for our accumulator, to avoid overflowing 16.16
Sk48Dot16 max = SkScalarToFixed(maxWidth);
Sk48Dot16 width = 0;
SkAutoKern autokern;
if (this->isDevKernText()) {
int rsb = 0;
while (pred(text, stop)) {
const char* curr = text;
const SkGlyph& g = glyphCacheProc(cache, &text);
SkFixed x = SkAutoKern_AdjustF(rsb, g.fLsbDelta) + advance(g, xyIndex);
if ((width += x) > max) {
width -= x;
text = curr;
break;
}
rsb = g.fRsbDelta;
}
} else {
while (pred(text, stop)) {
const char* curr = text;
SkFixed x = advance(glyphCacheProc(cache, &text), xyIndex);
if ((width += x) > max) {
width -= x;
text = curr;
break;
}
}
}
if (measuredWidth) {
SkScalar scalarWidth = Sk48Dot16ToScalar(width);
if (scale) {
scalarWidth = SkScalarMul(scalarWidth, scale);
}
*measuredWidth = scalarWidth;
}
// return the number of bytes measured
return (kForward_TextBufferDirection == tbd) ?
text - stop + length : stop - text + length;
}
///////////////////////////////////////////////////////////////////////////////
static bool FontMetricsCacheProc(const SkGlyphCache* cache, void* context) {
*(SkPaint::FontMetrics*)context = cache->getFontMetricsY();
return false; // don't detach the cache
}
static void FontMetricsDescProc(const SkDescriptor* desc, void* context) {
SkGlyphCache::VisitCache(desc, FontMetricsCacheProc, context);
}
SkScalar SkPaint::getFontMetrics(FontMetrics* metrics, SkScalar zoom) const {
SkScalar scale = 0;
SkAutoRestorePaintTextSizeAndFrame restore(this);
if (this->isLinearText()) {
scale = fTextSize / kCanonicalTextSizeForPaths;
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkMatrix zoomMatrix, *zoomPtr = NULL;
if (zoom) {
zoomMatrix.setScale(zoom, zoom);
zoomPtr = &zoomMatrix;
}
#if 0
SkAutoGlyphCache autoCache(*this, zoomPtr);
SkGlyphCache* cache = autoCache.getCache();
const FontMetrics& my = cache->getFontMetricsY();
#endif
FontMetrics storage;
if (NULL == metrics) {
metrics = &storage;
}
this->descriptorProc(zoomPtr, FontMetricsDescProc, metrics, true);
if (scale) {
metrics->fTop = SkScalarMul(metrics->fTop, scale);
metrics->fAscent = SkScalarMul(metrics->fAscent, scale);
metrics->fDescent = SkScalarMul(metrics->fDescent, scale);
metrics->fBottom = SkScalarMul(metrics->fBottom, scale);
metrics->fLeading = SkScalarMul(metrics->fLeading, scale);
}
return metrics->fDescent - metrics->fAscent + metrics->fLeading;
}
///////////////////////////////////////////////////////////////////////////////
static void set_bounds(const SkGlyph& g, SkRect* bounds, SkScalar scale) {
bounds->set(g.fLeft * scale,
g.fTop * scale,
(g.fLeft + g.fWidth) * scale,
(g.fTop + g.fHeight) * scale);
}
int SkPaint::getTextWidths(const void* textData, size_t byteLength,
SkScalar widths[], SkRect bounds[]) const {
if (0 == byteLength) {
return 0;
}
SkASSERT(NULL != textData);
if (NULL == widths && NULL == bounds) {
return this->countText(textData, byteLength);
}
SkAutoRestorePaintTextSizeAndFrame restore(this);
SkScalar scale = 0;
if (this->isLinearText()) {
scale = fTextSize / kCanonicalTextSizeForPaths;
// this gets restored by restore
((SkPaint*)this)->setTextSize(SkIntToScalar(kCanonicalTextSizeForPaths));
}
SkAutoGlyphCache autoCache(*this, NULL);
SkGlyphCache* cache = autoCache.getCache();
SkMeasureCacheProc glyphCacheProc;
glyphCacheProc = this->getMeasureCacheProc(kForward_TextBufferDirection,
NULL != bounds);
const char* text = (const char*)textData;
const char* stop = text + byteLength;
int count = 0;
const int xyIndex = this->isVerticalText() ? 1 : 0;
if (this->isDevKernText()) {
// we adjust the widths returned here through auto-kerning
SkAutoKern autokern;
SkFixed prevWidth = 0;
if (scale) {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
SkFixed adjust = autokern.adjust(g);
if (count > 0) {
SkScalar w = SkFixedToScalar(prevWidth + adjust);
*widths++ = SkScalarMul(w, scale);
}
prevWidth = advance(g, xyIndex);
}
if (bounds) {
set_bounds(g, bounds++, scale);
}
++count;
}
if (count > 0 && widths) {
*widths = SkScalarMul(SkFixedToScalar(prevWidth), scale);
}
} else {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
SkFixed adjust = autokern.adjust(g);
if (count > 0) {
*widths++ = SkFixedToScalar(prevWidth + adjust);
}
prevWidth = advance(g, xyIndex);
}
if (bounds) {
set_bounds(g, bounds++);
}
++count;
}
if (count > 0 && widths) {
*widths = SkFixedToScalar(prevWidth);
}
}
} else { // no devkern
if (scale) {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
*widths++ = SkScalarMul(SkFixedToScalar(advance(g, xyIndex)),
scale);
}
if (bounds) {
set_bounds(g, bounds++, scale);
}
++count;
}
} else {
while (text < stop) {
const SkGlyph& g = glyphCacheProc(cache, &text);
if (widths) {
*widths++ = SkFixedToScalar(advance(g, xyIndex));
}
if (bounds) {
set_bounds(g, bounds++);
}
++count;
}
}
}
SkASSERT(text == stop);
return count;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkDraw.h"
void SkPaint::getTextPath(const void* textData, size_t length,
SkScalar x, SkScalar y, SkPath* path) const {
SkASSERT(length == 0 || textData != NULL);
const char* text = (const char*)textData;
if (text == NULL || length == 0 || path == NULL) {
return;
}
SkTextToPathIter iter(text, length, *this, false, true);
SkMatrix matrix;
SkScalar prevXPos = 0;
matrix.setScale(iter.getPathScale(), iter.getPathScale());
matrix.postTranslate(x, y);
path->reset();
SkScalar xpos;
const SkPath* iterPath;
while ((iterPath = iter.next(&xpos)) != NULL) {
matrix.postTranslate(xpos - prevXPos, 0);
path->addPath(*iterPath, matrix);
prevXPos = xpos;
}
}
static void add_flattenable(SkDescriptor* desc, uint32_t tag,
SkFlattenableWriteBuffer* buffer) {
buffer->flatten(desc->addEntry(tag, buffer->size(), NULL));
}
// SkFontHost can override this choice in FilterRec()
static SkMask::Format computeMaskFormat(const SkPaint& paint) {
uint32_t flags = paint.getFlags();
// Antialiasing being disabled trumps all other settings.
if (!(flags & SkPaint::kAntiAlias_Flag)) {
return SkMask::kBW_Format;
}
if (flags & SkPaint::kLCDRenderText_Flag) {
return SkMask::kLCD16_Format;
}
return SkMask::kA8_Format;
}
// if linear-text is on, then we force hinting to be off (since that's sort of
// the point of linear-text.
static SkPaint::Hinting computeHinting(const SkPaint& paint) {
SkPaint::Hinting h = paint.getHinting();
if (paint.isLinearText()) {
h = SkPaint::kNo_Hinting;
}
return h;
}
// return true if the paint is just a single color (i.e. not a shader). If its
// a shader, then we can't compute a const luminance for it :(
static bool justAColor(const SkPaint& paint, SkColor* color) {
if (paint.getShader()) {
return false;
}
SkColor c = paint.getColor();
if (paint.getColorFilter()) {
c = paint.getColorFilter()->filterColor(c);
}
if (color) {
*color = c;
}
return true;
}
#ifdef SK_USE_COLOR_LUMINANCE
static SkColor computeLuminanceColor(const SkPaint& paint) {
SkColor c;
if (!justAColor(paint, &c)) {
c = SkColorSetRGB(0x7F, 0x80, 0x7F);
}
return c;
}
#define assert_byte(x) SkASSERT(0 == ((x) >> 8))
static U8CPU reduce_lumbits(U8CPU x) {
static const uint8_t gReduceBits[] = {
0x0, 0x55, 0xAA, 0xFF
};
assert_byte(x);
return gReduceBits[x >> 6];
}
static unsigned computeLuminance(SkColor c) {
int r = SkColorGetR(c);
int g = SkColorGetG(c);
int b = SkColorGetB(c);
// compute luminance
// R=0.2126 G=0.7152 B=0.0722
// scaling by 127 yields 27, 92, 9
int luminance = r * 27 + g * 92 + b * 9;
luminance >>= 7;
assert_byte(luminance);
return luminance;
}
#else
// returns 0..kLuminance_Max
static unsigned computeLuminance(const SkPaint& paint) {
SkColor c;
if (justAColor(paint, &c)) {
int r = SkColorGetR(c);
int g = SkColorGetG(c);
int b = SkColorGetB(c);
// compute luminance
// R=0.2126 G=0.7152 B=0.0722
// scaling by 127 yields 27, 92, 9
#if 1
int luminance = r * 27 + g * 92 + b * 9;
luminance >>= 15 - SkScalerContext::kLuminance_Bits;
#else
int luminance = r * 2 + g * 5 + b * 1;
luminance >>= 11 - SkScalerContext::kLuminance_Bits;
#endif
SkASSERT(luminance <= SkScalerContext::kLuminance_Max);
return luminance;
}
// if we're not a single color, return the middle of the luminance range
return SkScalerContext::kLuminance_Max >> 1;
}
#endif
// Beyond this size, LCD doesn't appreciably improve quality, but it always
// cost more RAM and draws slower, so we set a cap.
#ifndef SK_MAX_SIZE_FOR_LCDTEXT
#define SK_MAX_SIZE_FOR_LCDTEXT 48
#endif
static bool tooBigForLCD(const SkScalerContext::Rec& rec) {
SkScalar area = SkScalarMul(rec.fPost2x2[0][0], rec.fPost2x2[1][1]) -
SkScalarMul(rec.fPost2x2[1][0], rec.fPost2x2[0][1]);
SkScalar size = SkScalarMul(area, rec.fTextSize);
return SkScalarAbs(size) > SkIntToScalar(SK_MAX_SIZE_FOR_LCDTEXT);
}
/*
* Return the scalar with only limited fractional precision. Used to consolidate matrices
* that vary only slightly when we create our key into the font cache, since the font scaler
* typically returns the same looking resuts for tiny changes in the matrix.
*/
static SkScalar sk_relax(SkScalar x) {
#ifdef SK_SCALAR_IS_FLOAT
int n = sk_float_round2int(x * 1024);
return n / 1024.0f;
#else
// round to the nearest 10 fractional bits
return (x + (1 << 5)) & ~(1024 - 1);
#endif
}
void SkScalerContext::MakeRec(const SkPaint& paint,
const SkMatrix* deviceMatrix, Rec* rec) {
SkASSERT(deviceMatrix == NULL || !deviceMatrix->hasPerspective());
SkTypeface* typeface = paint.getTypeface();
rec->fOrigFontID = SkTypeface::UniqueID(typeface);
rec->fFontID = rec->fOrigFontID;
rec->fTextSize = paint.getTextSize();
rec->fPreScaleX = paint.getTextScaleX();
rec->fPreSkewX = paint.getTextSkewX();
if (deviceMatrix) {
rec->fPost2x2[0][0] = sk_relax(deviceMatrix->getScaleX());
rec->fPost2x2[0][1] = sk_relax(deviceMatrix->getSkewX());
rec->fPost2x2[1][0] = sk_relax(deviceMatrix->getSkewY());
rec->fPost2x2[1][1] = sk_relax(deviceMatrix->getScaleY());
} else {
rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1;
rec->fPost2x2[0][1] = rec->fPost2x2[1][0] = 0;
}
SkPaint::Style style = paint.getStyle();
SkScalar strokeWidth = paint.getStrokeWidth();
unsigned flags = 0;
#ifdef SK_USE_FREETYPE_EMBOLDEN
// It is possible that the SkTypeface used to draw glyphs has
// different properties than the SkTypeface set in the SkPaint.
// If we are asked to render bold text with a bold font, and are
// forced to fall back to a font with normal weight for some
// glyphs, we need to use fake bold to render those glyphs. In
// order to do that, we set SkScalerContext's "embolden" flag
// here if we are trying to draw bold text via any means, and
// ignore it at the glyph outline generation stage if the font
// actually being used is already bold.
if (paint.isFakeBoldText() || (typeface && typeface->isBold())) {
flags |= SkScalerContext::kEmbolden_Flag;
}
#else
if (paint.isFakeBoldText()) {
SkScalar fakeBoldScale = SkScalarInterpFunc(paint.getTextSize(),
kStdFakeBoldInterpKeys,
kStdFakeBoldInterpValues,
kStdFakeBoldInterpLength);
SkScalar extra = SkScalarMul(paint.getTextSize(), fakeBoldScale);
if (style == SkPaint::kFill_Style) {
style = SkPaint::kStrokeAndFill_Style;
strokeWidth = extra; // ignore paint's strokeWidth if it was "fill"
} else {
strokeWidth += extra;
}
}
#endif
if (paint.isDevKernText()) {
flags |= SkScalerContext::kDevKernText_Flag;
}
if (style != SkPaint::kFill_Style && strokeWidth > 0) {
rec->fFrameWidth = strokeWidth;
rec->fMiterLimit = paint.getStrokeMiter();
rec->fStrokeJoin = SkToU8(paint.getStrokeJoin());
if (style == SkPaint::kStrokeAndFill_Style) {
flags |= SkScalerContext::kFrameAndFill_Flag;
}
} else {
rec->fFrameWidth = 0;
rec->fMiterLimit = 0;
rec->fStrokeJoin = 0;
}
rec->fMaskFormat = SkToU8(computeMaskFormat(paint));
if (SkMask::kLCD16_Format == rec->fMaskFormat ||
SkMask::kLCD32_Format == rec->fMaskFormat)
{
SkFontHost::LCDOrder order = SkFontHost::GetSubpixelOrder();
SkFontHost::LCDOrientation orient = SkFontHost::GetSubpixelOrientation();
if (SkFontHost::kNONE_LCDOrder == order || tooBigForLCD(*rec)) {
// eeek, can't support LCD
rec->fMaskFormat = SkMask::kA8_Format;
} else {
if (SkFontHost::kVertical_LCDOrientation == orient) {
flags |= SkScalerContext::kLCD_Vertical_Flag;
}
if (SkFontHost::kBGR_LCDOrder == order) {
flags |= SkScalerContext::kLCD_BGROrder_Flag;
}
}
}
if (paint.isEmbeddedBitmapText()) {
flags |= SkScalerContext::kEmbeddedBitmapText_Flag;
}
if (paint.isSubpixelText()) {
flags |= SkScalerContext::kSubpixelPositioning_Flag;
}
if (paint.isAutohinted()) {
flags |= SkScalerContext::kAutohinting_Flag;
}
if (paint.isVerticalText()) {
flags |= SkScalerContext::kVertical_Flag;
}
if (paint.getFlags() & SkPaint::kGenA8FromLCD_Flag) {
flags |= SkScalerContext::kGenA8FromLCD_Flag;
}
rec->fFlags = SkToU16(flags);
// these modify fFlags, so do them after assigning fFlags
rec->setHinting(computeHinting(paint));
#ifdef SK_USE_COLOR_LUMINANCE
rec->setLuminanceColor(computeLuminanceColor(paint));
#else
rec->setLuminanceBits(computeLuminance(paint));
#endif
/* Allow the fonthost to modify our rec before we use it as a key into the
cache. This way if we're asking for something that they will ignore,
they can modify our rec up front, so we don't create duplicate cache
entries.
*/
SkFontHost::FilterRec(rec);
// be sure to call PostMakeRec(rec) before you actually use it!
}
/**
* We ensure that the rec is self-consistent and efficient (where possible)
*/
void SkScalerContext::PostMakeRec(SkScalerContext::Rec* rec) {
/**
* If we're asking for A8, we force the colorlum to be gray, since that
* that limits the number of unique entries, and the scaler will only
* look at the lum of one of them.
*/
switch (rec->fMaskFormat) {
case SkMask::kLCD16_Format:
case SkMask::kLCD32_Format: {
#ifdef SK_USE_COLOR_LUMINANCE
// filter down the luminance color to a finite number of bits
SkColor c = rec->getLuminanceColor();
c = SkColorSetRGB(reduce_lumbits(SkColorGetR(c)),
reduce_lumbits(SkColorGetG(c)),
reduce_lumbits(SkColorGetB(c)));
rec->setLuminanceColor(c);
#endif
break;
}
case SkMask::kA8_Format: {
#ifdef SK_USE_COLOR_LUMINANCE
// filter down the luminance to a single component, since A8 can't
// use per-component information
unsigned lum = computeLuminance(rec->getLuminanceColor());
// reduce to our finite number of bits
lum = reduce_lumbits(lum);
rec->setLuminanceColor(SkColorSetRGB(lum, lum, lum));
#endif
break;
}
case SkMask::kBW_Format:
// No need to differentiate gamma if we're BW
#ifdef SK_USE_COLOR_LUMINANCE
rec->setLuminanceColor(0);
#else
rec->setLuminanceBits(0);
#endif
break;
}
}
#define MIN_SIZE_FOR_EFFECT_BUFFER 1024
#ifdef SK_DEBUG
#define TEST_DESC
#endif
/*
* ignoreGamma tells us that the caller just wants metrics that are unaffected
* by gamma correction, so we jam the luminance field to 0 (most common value
* for black text) in hopes that we get a cache hit easier. A better solution
* would be for the fontcache lookup to know to ignore the luminance field
* entirely, but not sure how to do that and keep it fast.
*/
void SkPaint::descriptorProc(const SkMatrix* deviceMatrix,
void (*proc)(const SkDescriptor*, void*),
void* context, bool ignoreGamma) const {
SkScalerContext::Rec rec;
SkScalerContext::MakeRec(*this, deviceMatrix, &rec);
if (ignoreGamma) {
#ifdef SK_USE_COLOR_LUMINANCE
rec.setLuminanceColor(0);
#else
rec.setLuminanceBits(0);
#endif
}
size_t descSize = sizeof(rec);
int entryCount = 1;
SkPathEffect* pe = this->getPathEffect();
SkMaskFilter* mf = this->getMaskFilter();
SkRasterizer* ra = this->getRasterizer();
SkFlattenableWriteBuffer peBuffer(MIN_SIZE_FOR_EFFECT_BUFFER);
SkFlattenableWriteBuffer mfBuffer(MIN_SIZE_FOR_EFFECT_BUFFER);
SkFlattenableWriteBuffer raBuffer(MIN_SIZE_FOR_EFFECT_BUFFER);
if (pe) {
peBuffer.writeFlattenable(pe);
descSize += peBuffer.size();
entryCount += 1;
rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion
// seems like we could support kLCD as well at this point...
}
if (mf) {
mfBuffer.writeFlattenable(mf);
descSize += mfBuffer.size();
entryCount += 1;
rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing with maskfilters
}
if (ra) {
raBuffer.writeFlattenable(ra);
descSize += raBuffer.size();
entryCount += 1;
rec.fMaskFormat = SkMask::kA8_Format; // force antialiasing when we do the scan conversion
}
///////////////////////////////////////////////////////////////////////////
// Now that we're done tweaking the rec, call the PostMakeRec cleanup
SkScalerContext::PostMakeRec(&rec);
descSize += SkDescriptor::ComputeOverhead(entryCount);
SkAutoDescriptor ad(descSize);
SkDescriptor* desc = ad.getDesc();
desc->init();
desc->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec);
if (pe) {
add_flattenable(desc, kPathEffect_SkDescriptorTag, &peBuffer);
}
if (mf) {
add_flattenable(desc, kMaskFilter_SkDescriptorTag, &mfBuffer);
}
if (ra) {
add_flattenable(desc, kRasterizer_SkDescriptorTag, &raBuffer);
}
SkASSERT(descSize == desc->getLength());
desc->computeChecksum();
#ifdef TEST_DESC
{
// Check that we completely write the bytes in desc (our key), and that
// there are no uninitialized bytes. If there were, then we would get
// false-misses (or worse, false-hits) in our fontcache.
//
// We do this buy filling 2 others, one with 0s and the other with 1s
// and create those, and then check that all 3 are identical.
SkAutoDescriptor ad1(descSize);
SkAutoDescriptor ad2(descSize);
SkDescriptor* desc1 = ad1.getDesc();
SkDescriptor* desc2 = ad2.getDesc();
memset(desc1, 0x00, descSize);
memset(desc2, 0xFF, descSize);
desc1->init();
desc2->init();
desc1->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec);
desc2->addEntry(kRec_SkDescriptorTag, sizeof(rec), &rec);
if (pe) {
add_flattenable(desc1, kPathEffect_SkDescriptorTag, &peBuffer);
add_flattenable(desc2, kPathEffect_SkDescriptorTag, &peBuffer);
}
if (mf) {
add_flattenable(desc1, kMaskFilter_SkDescriptorTag, &mfBuffer);
add_flattenable(desc2, kMaskFilter_SkDescriptorTag, &mfBuffer);
}
if (ra) {
add_flattenable(desc1, kRasterizer_SkDescriptorTag, &raBuffer);
add_flattenable(desc2, kRasterizer_SkDescriptorTag, &raBuffer);
}
SkASSERT(descSize == desc1->getLength());
SkASSERT(descSize == desc2->getLength());
desc1->computeChecksum();
desc2->computeChecksum();
SkASSERT(!memcmp(desc, desc1, descSize));
SkASSERT(!memcmp(desc, desc2, descSize));
}
#endif
proc(desc, context);
}
SkGlyphCache* SkPaint::detachCache(const SkMatrix* deviceMatrix) const {
SkGlyphCache* cache;
this->descriptorProc(deviceMatrix, DetachDescProc, &cache);
return cache;
}
///////////////////////////////////////////////////////////////////////////////
#include "SkStream.h"
static uintptr_t asint(const void* p) {
return reinterpret_cast<uintptr_t>(p);
}
union Scalar32 {
SkScalar fScalar;
uint32_t f32;
};
static uint32_t* write_scalar(uint32_t* ptr, SkScalar value) {
SkASSERT(sizeof(SkScalar) == sizeof(uint32_t));
Scalar32 tmp;
tmp.fScalar = value;
*ptr = tmp.f32;
return ptr + 1;
}
static SkScalar read_scalar(const uint32_t*& ptr) {
SkASSERT(sizeof(SkScalar) == sizeof(uint32_t));
Scalar32 tmp;
tmp.f32 = *ptr++;
return tmp.fScalar;
}
static uint32_t pack_4(unsigned a, unsigned b, unsigned c, unsigned d) {
SkASSERT(a == (uint8_t)a);
SkASSERT(b == (uint8_t)b);
SkASSERT(c == (uint8_t)c);
SkASSERT(d == (uint8_t)d);
return (a << 24) | (b << 16) | (c << 8) | d;
}
enum FlatFlags {
kHasTypeface_FlatFlag = 0x01,
kHasEffects_FlatFlag = 0x02
};
// The size of a flat paint's POD fields
static const uint32_t kPODPaintSize = 5 * sizeof(SkScalar) +
1 * sizeof(SkColor) +
1 * sizeof(uint16_t) +
6 * sizeof(uint8_t);
/* To save space/time, we analyze the paint, and write a truncated version of
it if there are not tricky elements like shaders, etc.
*/
void SkPaint::flatten(SkFlattenableWriteBuffer& buffer) const {
uint8_t flatFlags = 0;
if (this->getTypeface()) {
flatFlags |= kHasTypeface_FlatFlag;
}
if (asint(this->getPathEffect()) |
asint(this->getShader()) |
asint(this->getXfermode()) |
asint(this->getMaskFilter()) |
asint(this->getColorFilter()) |
asint(this->getRasterizer()) |
asint(this->getLooper()) |
asint(this->getImageFilter())) {
flatFlags |= kHasEffects_FlatFlag;
}
SkASSERT(SkAlign4(kPODPaintSize) == kPODPaintSize);
uint32_t* ptr = buffer.reserve(kPODPaintSize);
ptr = write_scalar(ptr, this->getTextSize());
ptr = write_scalar(ptr, this->getTextScaleX());
ptr = write_scalar(ptr, this->getTextSkewX());
ptr = write_scalar(ptr, this->getStrokeWidth());
ptr = write_scalar(ptr, this->getStrokeMiter());
*ptr++ = this->getColor();
// previously flags:16, textAlign:8, flatFlags:8
// now flags:16, hinting:4, textAlign:4, flatFlags:8
*ptr++ = (this->getFlags() << 16) |
// hinting added later. 0 in this nibble means use the default.
((this->getHinting()+1) << 12) |
(this->getTextAlign() << 8) |
flatFlags;
*ptr++ = pack_4(this->getStrokeCap(), this->getStrokeJoin(),
this->getStyle(), this->getTextEncoding());
// now we're done with ptr and the (pre)reserved space. If we need to write
// additional fields, use the buffer directly
if (flatFlags & kHasTypeface_FlatFlag) {
buffer.writeTypeface(this->getTypeface());
}
if (flatFlags & kHasEffects_FlatFlag) {
buffer.writeFlattenable(this->getPathEffect());
buffer.writeFlattenable(this->getShader());
buffer.writeFlattenable(this->getXfermode());
buffer.writeFlattenable(this->getMaskFilter());
buffer.writeFlattenable(this->getColorFilter());
buffer.writeFlattenable(this->getRasterizer());
buffer.writeFlattenable(this->getLooper());
buffer.writeFlattenable(this->getImageFilter());
}
}
void SkPaint::unflatten(SkFlattenableReadBuffer& buffer) {
SkASSERT(SkAlign4(kPODPaintSize) == kPODPaintSize);
const void* podData = buffer.skip(kPODPaintSize);
const uint32_t* pod = reinterpret_cast<const uint32_t*>(podData);
// the order we read must match the order we wrote in flatten()
this->setTextSize(read_scalar(pod));
this->setTextScaleX(read_scalar(pod));
this->setTextSkewX(read_scalar(pod));
this->setStrokeWidth(read_scalar(pod));
this->setStrokeMiter(read_scalar(pod));
this->setColor(*pod++);
// previously flags:16, textAlign:8, flatFlags:8
// now flags:16, hinting:4, textAlign:4, flatFlags:8
uint32_t tmp = *pod++;
this->setFlags(tmp >> 16);
if (buffer.getPictureVersion() == PICTURE_VERSION_ICS) {
this->setTextAlign(static_cast<Align>((tmp >> 8) & 0xFF));
this->setHinting(SkPaintDefaults_Hinting);
} else {
// hinting added later. 0 in this nibble means use the default.
uint32_t hinting = (tmp >> 12) & 0xF;
this->setHinting(0 == hinting ? kNormal_Hinting : static_cast<Hinting>(hinting-1));
this->setTextAlign(static_cast<Align>((tmp >> 8) & 0xF));
}
uint8_t flatFlags = tmp & 0xFF;
tmp = *pod++;
this->setStrokeCap(static_cast<Cap>((tmp >> 24) & 0xFF));
this->setStrokeJoin(static_cast<Join>((tmp >> 16) & 0xFF));
this->setStyle(static_cast<Style>((tmp >> 8) & 0xFF));
this->setTextEncoding(static_cast<TextEncoding>((tmp >> 0) & 0xFF));
if (flatFlags & kHasTypeface_FlatFlag) {
this->setTypeface(buffer.readTypeface());
} else {
this->setTypeface(NULL);
}
if (flatFlags & kHasEffects_FlatFlag) {
SkSafeUnref(this->setPathEffect((SkPathEffect*) buffer.readFlattenable()));
SkSafeUnref(this->setShader((SkShader*) buffer.readFlattenable()));
SkSafeUnref(this->setXfermode((SkXfermode*) buffer.readFlattenable()));
SkSafeUnref(this->setMaskFilter((SkMaskFilter*) buffer.readFlattenable()));
SkSafeUnref(this->setColorFilter((SkColorFilter*) buffer.readFlattenable()));
SkSafeUnref(this->setRasterizer((SkRasterizer*) buffer.readFlattenable()));
SkSafeUnref(this->setLooper((SkDrawLooper*) buffer.readFlattenable()));
if (buffer.getPictureVersion() != PICTURE_VERSION_ICS)
SkSafeUnref(this->setImageFilter((SkImageFilter*) buffer.readFlattenable()));
else
this->setImageFilter(NULL);
} else {
this->setPathEffect(NULL);
this->setShader(NULL);
this->setXfermode(NULL);
this->setMaskFilter(NULL);
this->setColorFilter(NULL);
this->setRasterizer(NULL);
this->setLooper(NULL);
this->setImageFilter(NULL);
}
}
///////////////////////////////////////////////////////////////////////////////
SkShader* SkPaint::setShader(SkShader* shader) {
GEN_ID_INC_EVAL(shader != fShader);
SkRefCnt_SafeAssign(fShader, shader);
return shader;
}
SkColorFilter* SkPaint::setColorFilter(SkColorFilter* filter) {
GEN_ID_INC_EVAL(filter != fColorFilter);
SkRefCnt_SafeAssign(fColorFilter, filter);
return filter;
}
SkXfermode* SkPaint::setXfermode(SkXfermode* mode) {
GEN_ID_INC_EVAL(mode != fXfermode);
SkRefCnt_SafeAssign(fXfermode, mode);
return mode;
}
SkXfermode* SkPaint::setXfermodeMode(SkXfermode::Mode mode) {
SkSafeUnref(fXfermode);
fXfermode = SkXfermode::Create(mode);
GEN_ID_INC;
return fXfermode;
}
SkPathEffect* SkPaint::setPathEffect(SkPathEffect* effect) {
GEN_ID_INC_EVAL(effect != fPathEffect);
SkRefCnt_SafeAssign(fPathEffect, effect);
return effect;
}
SkMaskFilter* SkPaint::setMaskFilter(SkMaskFilter* filter) {
GEN_ID_INC_EVAL(filter != fMaskFilter);
SkRefCnt_SafeAssign(fMaskFilter, filter);
return filter;
}
///////////////////////////////////////////////////////////////////////////////
bool SkPaint::getFillPath(const SkPath& src, SkPath* dst) const {
SkPath effectPath, strokePath;
const SkPath* path = &src;
SkScalar width = this->getStrokeWidth();
switch (this->getStyle()) {
case SkPaint::kFill_Style:
width = -1; // mark it as no-stroke
break;
case SkPaint::kStrokeAndFill_Style:
if (width == 0) {
width = -1; // mark it as no-stroke
}
break;
case SkPaint::kStroke_Style:
break;
default:
SkDEBUGFAIL("unknown paint style");
}
if (this->getPathEffect()) {
// lie to the pathEffect if our style is strokeandfill, so that it treats us as just fill
if (this->getStyle() == SkPaint::kStrokeAndFill_Style) {
width = -1; // mark it as no-stroke
}
if (this->getPathEffect()->filterPath(&effectPath, src, &width)) {
path = &effectPath;
}
// restore the width if we earlier had to lie, and if we're still set to no-stroke
// note: if we're now stroke (width >= 0), then the pathEffect asked for that change
// and we want to respect that (i.e. don't overwrite their setting for width)
if (this->getStyle() == SkPaint::kStrokeAndFill_Style && width < 0) {
width = this->getStrokeWidth();
if (width == 0) {
width = -1;
}
}
}
if (width > 0 && !path->isEmpty()) {
SkStroke stroker(*this, width);
stroker.strokePath(*path, &strokePath);
path = &strokePath;
}
if (path == &src) {
*dst = src;
} else {
SkASSERT(path == &effectPath || path == &strokePath);
dst->swap(*(SkPath*)path);
}
return width != 0; // return true if we're filled, or false if we're hairline (width == 0)
}
const SkRect& SkPaint::doComputeFastBounds(const SkRect& src,
SkRect* storage) const {
SkASSERT(storage);
if (this->getLooper()) {
SkASSERT(this->getLooper()->canComputeFastBounds(*this));
this->getLooper()->computeFastBounds(*this, src, storage);
return *storage;
}
if (this->getStyle() != SkPaint::kFill_Style) {
// since we're stroked, outset the rect by the radius (and join type)
SkScalar radius = SkScalarHalf(this->getStrokeWidth());
if (0 == radius) { // hairline
radius = SK_Scalar1;
} else if (this->getStrokeJoin() == SkPaint::kMiter_Join) {
SkScalar scale = this->getStrokeMiter();
if (scale > SK_Scalar1) {
radius = SkScalarMul(radius, scale);
}
}
storage->set(src.fLeft - radius, src.fTop - radius,
src.fRight + radius, src.fBottom + radius);
} else {
*storage = src;
}
// check the mask filter
if (this->getMaskFilter()) {
this->getMaskFilter()->computeFastBounds(*storage, storage);
}
return *storage;
}
///////////////////////////////////////////////////////////////////////////////
static bool has_thick_frame(const SkPaint& paint) {
return paint.getStrokeWidth() > 0 &&
paint.getStyle() != SkPaint::kFill_Style;
}
SkTextToPathIter::SkTextToPathIter( const char text[], size_t length,
const SkPaint& paint,
bool applyStrokeAndPathEffects,
bool forceLinearTextOn) : fPaint(paint) {
fGlyphCacheProc = paint.getMeasureCacheProc(SkPaint::kForward_TextBufferDirection,
true);
if (forceLinearTextOn) {
fPaint.setLinearText(true);
}
fPaint.setMaskFilter(NULL); // don't want this affecting our path-cache lookup
if (fPaint.getPathEffect() == NULL && !has_thick_frame(fPaint)) {
applyStrokeAndPathEffects = false;
}
// can't use our canonical size if we need to apply patheffects/strokes
if (fPaint.getPathEffect() == NULL) {
fPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));
fScale = paint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
if (has_thick_frame(fPaint)) {
fPaint.setStrokeWidth(SkScalarDiv(fPaint.getStrokeWidth(), fScale));
}
} else {
fScale = SK_Scalar1;
}
if (!applyStrokeAndPathEffects) {
fPaint.setStyle(SkPaint::kFill_Style);
fPaint.setPathEffect(NULL);
}
fCache = fPaint.detachCache(NULL);
SkPaint::Style style = SkPaint::kFill_Style;
SkPathEffect* pe = NULL;
if (!applyStrokeAndPathEffects) {
style = paint.getStyle(); // restore
pe = paint.getPathEffect(); // restore
}
fPaint.setStyle(style);
fPaint.setPathEffect(pe);
fPaint.setMaskFilter(paint.getMaskFilter()); // restore
// now compute fXOffset if needed
SkScalar xOffset = 0;
if (paint.getTextAlign() != SkPaint::kLeft_Align) { // need to measure first
int count;
SkScalar width = SkScalarMul(fPaint.measure_text(fCache, text, length,
&count, NULL), fScale);
if (paint.getTextAlign() == SkPaint::kCenter_Align) {
width = SkScalarHalf(width);
}
xOffset = -width;
}
fXPos = xOffset;
fPrevAdvance = 0;
fText = text;
fStop = text + length;
fXYIndex = paint.isVerticalText() ? 1 : 0;
}
SkTextToPathIter::~SkTextToPathIter() {
SkGlyphCache::AttachCache(fCache);
}
const SkPath* SkTextToPathIter::next(SkScalar* xpos) {
while (fText < fStop) {
const SkGlyph& glyph = fGlyphCacheProc(fCache, &fText);
fXPos += SkScalarMul(SkFixedToScalar(fPrevAdvance + fAutoKern.adjust(glyph)), fScale);
fPrevAdvance = advance(glyph, fXYIndex); // + fPaint.getTextTracking();
if (glyph.fWidth) {
if (xpos) {
*xpos = fXPos;
}
return fCache->findPath(glyph);
}
}
return NULL;
}
///////////////////////////////////////////////////////////////////////////////
bool SkPaint::nothingToDraw() const {
if (fLooper) {
return false;
}
SkXfermode::Mode mode;
if (SkXfermode::AsMode(fXfermode, &mode)) {
switch (mode) {
case SkXfermode::kSrcOver_Mode:
case SkXfermode::kSrcATop_Mode:
case SkXfermode::kDstOut_Mode:
case SkXfermode::kDstOver_Mode:
case SkXfermode::kPlus_Mode:
return 0 == this->getAlpha();
case SkXfermode::kDst_Mode:
return true;
default:
break;
}
}
return false;
}
//////////// Move these to their own file soon.
bool SkImageFilter::filterImage(Proxy* proxy, const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* result, SkIPoint* loc) {
SkASSERT(proxy);
SkASSERT(result);
SkASSERT(loc);
/*
* Give the proxy first shot at the filter. If it returns false, ask
* the filter to do it.
*/
return proxy->filterImage(this, src, ctm, result, loc) ||
this->onFilterImage(proxy, src, ctm, result, loc);
}
bool SkImageFilter::filterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) {
SkASSERT(&src);
SkASSERT(dst);
return this->onFilterBounds(src, ctm, dst);
}
bool SkImageFilter::onFilterImage(Proxy*, const SkBitmap&, const SkMatrix&,
SkBitmap*, SkIPoint*) {
return false;
}
bool SkImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) {
*dst = src;
return true;
}
bool SkImageFilter::asABlur(SkSize* sigma) const {
return false;
}
bool SkImageFilter::asAnErode(SkISize* radius) const {
return false;
}
bool SkImageFilter::asADilate(SkISize* radius) const {
return false;
}
//////
bool SkDrawLooper::canComputeFastBounds(const SkPaint& paint) {
SkCanvas canvas;
this->init(&canvas);
for (;;) {
SkPaint p(paint);
if (this->next(&canvas, &p)) {
p.setLooper(NULL);
if (!p.canComputeFastBounds()) {
return false;
}
} else {
break;
}
}
return true;
}
void SkDrawLooper::computeFastBounds(const SkPaint& paint, const SkRect& src,
SkRect* dst) {
SkCanvas canvas;
this->init(&canvas);
for (bool firstTime = true;; firstTime = false) {
SkPaint p(paint);
if (this->next(&canvas, &p)) {
SkRect r(src);
p.setLooper(NULL);
p.computeFastBounds(r, &r);
canvas.getTotalMatrix().mapRect(&r);
if (firstTime) {
*dst = r;
} else {
dst->join(r);
}
} else {
break;
}
}
}