| /* libs/graphics/sgl/SkPaint.cpp |
| ** |
| ** Copyright 2006, The Android Open Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| #include "SkPaint.h" |
| #include "SkColorFilter.h" |
| #include "SkDrawLooper.h" |
| #include "SkFontHost.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" |
| |
| #define SK_DefaultTextSize SkIntToScalar(12) |
| |
| #define SK_DefaultFlags 0 //(kNativeHintsText_Flag) |
| |
| 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; |
| fWidth = 0; |
| #endif |
| |
| fTextSize = SK_DefaultTextSize; |
| fTextScaleX = SK_Scalar1; |
| fColor = SK_ColorBLACK; |
| fMiterLimit = SK_DefaultMiterLimit; |
| fFlags = SK_DefaultFlags; |
| fCapType = kDefault_Cap; |
| fJoinType = kDefault_Join; |
| fTextAlign = kLeft_Align; |
| fStyle = kFill_Style; |
| fTextEncoding = kUTF8_TextEncoding; |
| fHinting = kNormal_Hinting; |
| } |
| |
| 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); |
| } |
| |
| SkPaint::~SkPaint() |
| { |
| SkSafeUnref(fTypeface); |
| SkSafeUnref(fPathEffect); |
| SkSafeUnref(fShader); |
| SkSafeUnref(fXfermode); |
| SkSafeUnref(fMaskFilter); |
| SkSafeUnref(fColorFilter); |
| SkSafeUnref(fRasterizer); |
| SkSafeUnref(fLooper); |
| } |
| |
| 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); |
| |
| SkSafeUnref(fTypeface); |
| SkSafeUnref(fPathEffect); |
| SkSafeUnref(fShader); |
| SkSafeUnref(fXfermode); |
| SkSafeUnref(fMaskFilter); |
| SkSafeUnref(fColorFilter); |
| SkSafeUnref(fRasterizer); |
| SkSafeUnref(fLooper); |
| |
| memcpy(this, &src, sizeof(src)); |
| |
| return *this; |
| } |
| |
| int operator==(const SkPaint& a, const SkPaint& b) |
| { |
| return memcmp(&a, &b, sizeof(a)) == 0; |
| } |
| |
| void SkPaint::reset() |
| { |
| SkPaint init; |
| |
| *this = init; |
| } |
| |
| void SkPaint::setFlags(uint32_t flags) |
| { |
| fFlags = flags; |
| } |
| |
| void SkPaint::setAntiAlias(bool doAA) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doAA, kAntiAlias_Flag)); |
| } |
| |
| void SkPaint::setDither(bool doDither) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doDither, kDither_Flag)); |
| } |
| |
| void SkPaint::setSubpixelText(bool doSubpixel) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doSubpixel, kSubpixelText_Flag)); |
| } |
| |
| void SkPaint::setLCDRenderText(bool doLCDRender) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doLCDRender, kLCDRenderText_Flag)); |
| } |
| |
| void SkPaint::setEmbeddedBitmapText(bool doEmbeddedBitmapText) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doEmbeddedBitmapText, kEmbeddedBitmapText_Flag)); |
| } |
| |
| void SkPaint::setAutohinted(bool useAutohinter) |
| { |
| this->setFlags(SkSetClearMask(fFlags, useAutohinter, kAutoHinting_Flag)); |
| } |
| |
| void SkPaint::setLinearText(bool doLinearText) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doLinearText, kLinearText_Flag)); |
| } |
| |
| void SkPaint::setUnderlineText(bool doUnderline) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doUnderline, kUnderlineText_Flag)); |
| } |
| |
| void SkPaint::setStrikeThruText(bool doStrikeThru) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doStrikeThru, kStrikeThruText_Flag)); |
| } |
| |
| void SkPaint::setFakeBoldText(bool doFakeBold) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doFakeBold, kFakeBoldText_Flag)); |
| } |
| |
| void SkPaint::setDevKernText(bool doDevKern) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doDevKern, kDevKernText_Flag)); |
| } |
| |
| void SkPaint::setFilterBitmap(bool doFilter) |
| { |
| this->setFlags(SkSetClearMask(fFlags, doFilter, kFilterBitmap_Flag)); |
| } |
| |
| void SkPaint::setStyle(Style style) |
| { |
| if ((unsigned)style < kStyleCount) |
| fStyle = style; |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setStyle(%d) out of range\n", style); |
| #endif |
| } |
| |
| void SkPaint::setColor(SkColor color) |
| { |
| fColor = color; |
| } |
| |
| void SkPaint::setAlpha(U8CPU a) |
| { |
| fColor = SkColorSetARGB(a, SkColorGetR(fColor), SkColorGetG(fColor), SkColorGetB(fColor)); |
| } |
| |
| void SkPaint::setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b) |
| { |
| fColor = SkColorSetARGB(a, r, g, b); |
| } |
| |
| void SkPaint::setStrokeWidth(SkScalar width) |
| { |
| if (width >= 0) |
| fWidth = width; |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setStrokeWidth() called with negative value\n"); |
| #endif |
| } |
| |
| void SkPaint::setStrokeMiter(SkScalar limit) |
| { |
| if (limit >= 0) |
| fMiterLimit = limit; |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setStrokeMiter() called with negative value\n"); |
| #endif |
| } |
| |
| void SkPaint::setStrokeCap(Cap ct) |
| { |
| if ((unsigned)ct < kCapCount) |
| fCapType = SkToU8(ct); |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setStrokeCap(%d) out of range\n", ct); |
| #endif |
| } |
| |
| void SkPaint::setStrokeJoin(Join jt) |
| { |
| if ((unsigned)jt < kJoinCount) |
| fJoinType = SkToU8(jt); |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setStrokeJoin(%d) out of range\n", jt); |
| #endif |
| } |
| |
| ////////////////////////////////////////////////////////////////// |
| |
| void SkPaint::setTextAlign(Align align) |
| { |
| if ((unsigned)align < kAlignCount) |
| fTextAlign = SkToU8(align); |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setTextAlign(%d) out of range\n", align); |
| #endif |
| } |
| |
| void SkPaint::setTextSize(SkScalar ts) |
| { |
| if (ts >= 0) |
| fTextSize = ts; |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setTextSize() called with negative value\n"); |
| #endif |
| } |
| |
| void SkPaint::setTextScaleX(SkScalar scaleX) |
| { |
| fTextScaleX = scaleX; |
| } |
| |
| void SkPaint::setTextSkewX(SkScalar skewX) |
| { |
| fTextSkewX = skewX; |
| } |
| |
| void SkPaint::setTextEncoding(TextEncoding encoding) |
| { |
| if ((unsigned)encoding <= kGlyphID_TextEncoding) |
| fTextEncoding = encoding; |
| #ifdef SK_DEBUG |
| else |
| SkDebugf("SkPaint::setTextEncoding(%d) out of range\n", encoding); |
| #endif |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////// |
| |
| SkTypeface* SkPaint::setTypeface(SkTypeface* font) |
| { |
| SkRefCnt_SafeAssign(fTypeface, font); |
| return font; |
| } |
| |
| SkRasterizer* SkPaint::setRasterizer(SkRasterizer* r) |
| { |
| SkRefCnt_SafeAssign(fRasterizer, r); |
| return r; |
| } |
| |
| SkDrawLooper* SkPaint::setLooper(SkDrawLooper* looper) |
| { |
| SkRefCnt_SafeAssign(fLooper, looper); |
| return looper; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkGlyphCache.h" |
| #include "SkUtils.h" |
| |
| 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: |
| SkASSERT(!"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: |
| SkASSERT(!"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: |
| SkASSERT(!"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(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)); |
| } |
| |
| 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 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 = g->fAdvanceX; |
| |
| 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) + g->fAdvanceX; |
| } |
| } |
| else |
| { |
| for (; text < stop; n++) { |
| x += glyphCacheProc(cache, &text).fAdvanceX; |
| } |
| } |
| } |
| 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); |
| join_bounds(*g, bounds, x); |
| x += g->fAdvanceX; |
| } |
| } |
| else |
| { |
| for (; text < stop; n++) { |
| g = &glyphCacheProc(cache, &text); |
| join_bounds(*g, bounds, x); |
| x += g->fAdvanceX; |
| } |
| } |
| } |
| 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; |
| } |
| |
| 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); |
| // 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) + g.fAdvanceX; |
| if ((width += x) > max) |
| { |
| width -= x; |
| text = curr; |
| break; |
| } |
| rsb = g.fRsbDelta; |
| } |
| } |
| else |
| { |
| while (pred(text, stop)) |
| { |
| const char* curr = text; |
| SkFixed x = glyphCacheProc(cache, &text).fAdvanceX; |
| 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); |
| |
| 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; |
| |
| 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 = g.fAdvanceX; |
| } |
| 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 = g.fAdvanceX; |
| } |
| 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(g.fAdvanceX), |
| scale); |
| } |
| if (bounds) { |
| set_bounds(g, bounds++, scale); |
| } |
| ++count; |
| } |
| } else { |
| while (text < stop) { |
| const SkGlyph& g = glyphCacheProc(cache, &text); |
| if (widths) { |
| *widths++ = SkFixedToScalar(g.fAdvanceX); |
| } |
| 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 |
| { |
| const char* text = (const char*)textData; |
| SkASSERT(length == 0 || text != NULL); |
| 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)); |
| } |
| |
| 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 defined(SK_SUPPORT_LCDTEXT) |
| if (flags & SkPaint::kLCDRenderText_Flag) |
| return SkFontHost::GetSubpixelOrientation() == SkFontHost::kHorizontal_LCDOrientation ? |
| SkMask::kHorizontalLCD_Format : SkMask::kVerticalLCD_Format; |
| #endif |
| |
| 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 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->getType() & SkMatrix::kPerspective_Mask) == 0); |
| |
| rec->fFontID = SkTypeface::UniqueID(paint.getTypeface()); |
| 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 = SkFontHost::ComputeGammaFlag(paint); |
| |
| if (paint.isFakeBoldText()) |
| { |
| #ifdef SK_USE_FREETYPE_EMBOLDEN |
| flags |= SkScalerContext::kEmbolden_Flag; |
| #else |
| 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)); |
| rec->fFlags = SkToU8(flags); |
| rec->setHinting(computeHinting(paint)); |
| if (paint.isEmbeddedBitmapText()) |
| rec->fFlags |= SkScalerContext::kEmbeddedBitmapText_Flag; |
| if (paint.isSubpixelText()) |
| rec->fFlags |= SkScalerContext::kSubpixelPositioning_Flag; |
| if (paint.isAutohinted()) |
| rec->fFlags |= SkScalerContext::kAutohinting_Flag; |
| |
| /* 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); |
| } |
| |
| #define MIN_SIZE_FOR_EFFECT_BUFFER 1024 |
| |
| void SkPaint::descriptorProc(const SkMatrix* deviceMatrix, |
| void (*proc)(const SkDescriptor*, void*), |
| void* context) const |
| { |
| SkScalerContext::Rec rec; |
| |
| SkScalerContext::MakeRec(*this, deviceMatrix, &rec); |
| |
| 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 |
| } |
| 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(); |
| |
| proc(desc, context); |
| } |
| |
| static void DetachDescProc(const SkDescriptor* desc, void* context) |
| { |
| *((SkGlyphCache**)context) = SkGlyphCache::DetachCache(desc); |
| } |
| |
| 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())) { |
| 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(); |
| *ptr++ = (this->getFlags() << 16) | (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()); |
| } |
| } |
| |
| 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++); |
| |
| uint32_t tmp = *pod++; |
| this->setFlags(tmp >> 16); |
| this->setTextAlign(static_cast<Align>((tmp >> 8) & 0xFF)); |
| 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())); |
| } else { |
| this->setPathEffect(NULL); |
| this->setShader(NULL); |
| this->setXfermode(NULL); |
| this->setMaskFilter(NULL); |
| this->setColorFilter(NULL); |
| this->setRasterizer(NULL); |
| this->setLooper(NULL); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkShader* SkPaint::setShader(SkShader* shader) { |
| SkRefCnt_SafeAssign(fShader, shader); |
| return shader; |
| } |
| |
| SkColorFilter* SkPaint::setColorFilter(SkColorFilter* filter) { |
| SkRefCnt_SafeAssign(fColorFilter, filter); |
| return filter; |
| } |
| |
| SkXfermode* SkPaint::setXfermode(SkXfermode* mode) { |
| SkRefCnt_SafeAssign(fXfermode, mode); |
| return mode; |
| } |
| |
| SkXfermode* SkPaint::setXfermodeMode(SkXfermode::Mode mode) { |
| SkSafeUnref(fXfermode); |
| fXfermode = SkXfermode::Create(mode); |
| return fXfermode; |
| } |
| |
| SkPathEffect* SkPaint::setPathEffect(SkPathEffect* effect) { |
| SkRefCnt_SafeAssign(fPathEffect, effect); |
| return effect; |
| } |
| |
| SkMaskFilter* SkPaint::setMaskFilter(SkMaskFilter* filter) { |
| 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: |
| SkASSERT(!"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::computeStrokeFastBounds(const SkRect& src, |
| SkRect* storage) const { |
| SkASSERT(storage); |
| SkASSERT(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); |
| 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) /* make a copy of the 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.isLinearText() && !applyStrokeAndPathEffects) |
| { |
| fPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths)); |
| fScale = paint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths; |
| } |
| 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; |
| } |
| |
| 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 = glyph.fAdvanceX; // + fPaint.getTextTracking(); |
| |
| if (glyph.fWidth) |
| { |
| if (xpos) |
| *xpos = fXPos; |
| return fCache->findPath(glyph); |
| } |
| } |
| return NULL; |
| } |