| |
| /* |
| * 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 "SkScalerContext.h" |
| #include "SkColorPriv.h" |
| #include "SkDescriptor.h" |
| #include "SkDraw.h" |
| #include "SkFontHost.h" |
| #include "SkMaskFilter.h" |
| #include "SkPathEffect.h" |
| #include "SkRasterizer.h" |
| #include "SkRasterClip.h" |
| #include "SkStroke.h" |
| #include "SkThread.h" |
| |
| #define ComputeBWRowBytes(width) (((unsigned)(width) + 7) >> 3) |
| |
| void SkGlyph::toMask(SkMask* mask) const { |
| SkASSERT(mask); |
| |
| mask->fImage = (uint8_t*)fImage; |
| mask->fBounds.set(fLeft, fTop, fLeft + fWidth, fTop + fHeight); |
| mask->fRowBytes = this->rowBytes(); |
| mask->fFormat = static_cast<SkMask::Format>(fMaskFormat); |
| } |
| |
| size_t SkGlyph::computeImageSize() const { |
| const size_t size = this->rowBytes() * fHeight; |
| |
| switch (fMaskFormat) { |
| case SkMask::k3D_Format: |
| return 3 * size; |
| default: |
| return size; |
| } |
| } |
| |
| void SkGlyph::zeroMetrics() { |
| fAdvanceX = 0; |
| fAdvanceY = 0; |
| fWidth = 0; |
| fHeight = 0; |
| fTop = 0; |
| fLeft = 0; |
| fRsbDelta = 0; |
| fLsbDelta = 0; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #ifdef SK_DEBUG |
| #define DUMP_RECx |
| #endif |
| |
| static SkFlattenable* load_flattenable(const SkDescriptor* desc, uint32_t tag) { |
| SkFlattenable* obj = NULL; |
| uint32_t len; |
| const void* data = desc->findEntry(tag, &len); |
| |
| if (data) { |
| SkFlattenableReadBuffer buffer(data, len); |
| obj = buffer.readFlattenable(); |
| SkASSERT(buffer.offset() == buffer.size()); |
| } |
| return obj; |
| } |
| |
| SkScalerContext::SkScalerContext(const SkDescriptor* desc) |
| : fPathEffect(NULL), fMaskFilter(NULL) |
| { |
| fBaseGlyphCount = 0; |
| fNextContext = NULL; |
| |
| const Rec* rec = (const Rec*)desc->findEntry(kRec_SkDescriptorTag, NULL); |
| SkASSERT(rec); |
| |
| fRec = *rec; |
| |
| #ifdef DUMP_REC |
| desc->assertChecksum(); |
| SkDebugf("SkScalarContext checksum %x count %d length %d\n", |
| desc->getChecksum(), desc->getCount(), desc->getLength()); |
| SkDebugf(" textsize %g prescale %g preskew %g post [%g %g %g %g]\n", |
| rec->fTextSize, rec->fPreScaleX, rec->fPreSkewX, rec->fPost2x2[0][0], |
| rec->fPost2x2[0][1], rec->fPost2x2[1][0], rec->fPost2x2[1][1]); |
| SkDebugf(" frame %g miter %g hints %d framefill %d format %d join %d\n", |
| rec->fFrameWidth, rec->fMiterLimit, rec->fHints, rec->fFrameAndFill, |
| rec->fMaskFormat, rec->fStrokeJoin); |
| SkDebugf(" pathEffect %x maskFilter %x\n", |
| desc->findEntry(kPathEffect_SkDescriptorTag, NULL), |
| desc->findEntry(kMaskFilter_SkDescriptorTag, NULL)); |
| #endif |
| |
| fPathEffect = (SkPathEffect*)load_flattenable(desc, kPathEffect_SkDescriptorTag); |
| fMaskFilter = (SkMaskFilter*)load_flattenable(desc, kMaskFilter_SkDescriptorTag); |
| fRasterizer = (SkRasterizer*)load_flattenable(desc, kRasterizer_SkDescriptorTag); |
| |
| // initialize based on our settings. subclasses can also force this |
| fGenerateImageFromPath = fRec.fFrameWidth > 0 || fPathEffect != NULL || |
| fRasterizer != NULL; |
| } |
| |
| SkScalerContext::~SkScalerContext() { |
| SkDELETE(fNextContext); |
| |
| SkSafeUnref(fPathEffect); |
| SkSafeUnref(fMaskFilter); |
| SkSafeUnref(fRasterizer); |
| } |
| |
| static SkScalerContext* allocNextContext(const SkScalerContext::Rec& rec) { |
| // fonthost will determine the next possible font to search, based |
| // on the current font in fRec. It will return NULL if ctx is our |
| // last font that can be searched (i.e. ultimate fallback font) |
| uint32_t newFontID = SkFontHost::NextLogicalFont(rec.fFontID, rec.fOrigFontID); |
| if (0 == newFontID) { |
| return NULL; |
| } |
| |
| SkAutoDescriptor ad(sizeof(rec) + SkDescriptor::ComputeOverhead(1)); |
| SkDescriptor* desc = ad.getDesc(); |
| |
| desc->init(); |
| SkScalerContext::Rec* newRec = |
| (SkScalerContext::Rec*)desc->addEntry(kRec_SkDescriptorTag, |
| sizeof(rec), &rec); |
| newRec->fFontID = newFontID; |
| desc->computeChecksum(); |
| |
| return SkFontHost::CreateScalerContext(desc); |
| } |
| |
| /* Return the next context, creating it if its not already created, but return |
| NULL if the fonthost says there are no more fonts to fallback to. |
| */ |
| SkScalerContext* SkScalerContext::getNextContext() { |
| SkScalerContext* next = fNextContext; |
| // if next is null, then either it isn't cached yet, or we're at the |
| // end of our possible chain |
| if (NULL == next) { |
| next = allocNextContext(fRec); |
| if (NULL == next) { |
| return NULL; |
| } |
| // next's base is our base + our local count |
| next->setBaseGlyphCount(fBaseGlyphCount + this->getGlyphCount()); |
| // cache the answer |
| fNextContext = next; |
| } |
| return next; |
| } |
| |
| SkScalerContext* SkScalerContext::getGlyphContext(const SkGlyph& glyph) { |
| unsigned glyphID = glyph.getGlyphID(); |
| SkScalerContext* ctx = this; |
| for (;;) { |
| unsigned count = ctx->getGlyphCount(); |
| if (glyphID < count) { |
| break; |
| } |
| glyphID -= count; |
| ctx = ctx->getNextContext(); |
| if (NULL == ctx) { |
| SkDebugf("--- no context for glyph %x\n", glyph.getGlyphID()); |
| // just return the original context (this) |
| return this; |
| } |
| } |
| return ctx; |
| } |
| |
| /* This loops through all available fallback contexts (if needed) until it |
| finds some context that can handle the unichar. If all fail, returns 0 |
| */ |
| uint16_t SkScalerContext::charToGlyphID(SkUnichar uni) { |
| SkScalerContext* ctx = this; |
| unsigned glyphID; |
| for (;;) { |
| glyphID = ctx->generateCharToGlyph(uni); |
| if (glyphID) { |
| break; // found it |
| } |
| ctx = ctx->getNextContext(); |
| if (NULL == ctx) { |
| return 0; // no more contexts, return missing glyph |
| } |
| } |
| // add the ctx's base, making glyphID unique for chain of contexts |
| glyphID += ctx->fBaseGlyphCount; |
| // check for overflow of 16bits, since our glyphID cannot exceed that |
| if (glyphID > 0xFFFF) { |
| glyphID = 0; |
| } |
| return SkToU16(glyphID); |
| } |
| |
| SkUnichar SkScalerContext::glyphIDToChar(uint16_t glyphID) { |
| SkScalerContext* ctx = this; |
| unsigned rangeEnd = 0; |
| do { |
| unsigned rangeStart = rangeEnd; |
| |
| rangeEnd += ctx->getGlyphCount(); |
| if (rangeStart <= glyphID && glyphID < rangeEnd) { |
| return ctx->generateGlyphToChar(glyphID - rangeStart); |
| } |
| ctx = ctx->getNextContext(); |
| } while (NULL != ctx); |
| return 0; |
| } |
| |
| void SkScalerContext::getAdvance(SkGlyph* glyph) { |
| // mark us as just having a valid advance |
| glyph->fMaskFormat = MASK_FORMAT_JUST_ADVANCE; |
| // we mark the format before making the call, in case the impl |
| // internally ends up calling its generateMetrics, which is OK |
| // albeit slower than strictly necessary |
| this->getGlyphContext(*glyph)->generateAdvance(glyph); |
| } |
| |
| void SkScalerContext::getMetrics(SkGlyph* glyph) { |
| this->getGlyphContext(*glyph)->generateMetrics(glyph); |
| |
| // for now we have separate cache entries for devkerning on and off |
| // in the future we might share caches, but make our measure/draw |
| // code make the distinction. Thus we zap the values if the caller |
| // has not asked for them. |
| if ((fRec.fFlags & SkScalerContext::kDevKernText_Flag) == 0) { |
| // no devkern, so zap the fields |
| glyph->fLsbDelta = glyph->fRsbDelta = 0; |
| } |
| |
| // if either dimension is empty, zap the image bounds of the glyph |
| if (0 == glyph->fWidth || 0 == glyph->fHeight) { |
| glyph->fWidth = 0; |
| glyph->fHeight = 0; |
| glyph->fTop = 0; |
| glyph->fLeft = 0; |
| glyph->fMaskFormat = 0; |
| return; |
| } |
| |
| if (fGenerateImageFromPath) { |
| SkPath devPath, fillPath; |
| SkMatrix fillToDevMatrix; |
| |
| this->internalGetPath(*glyph, &fillPath, &devPath, &fillToDevMatrix); |
| |
| if (fRasterizer) { |
| SkMask mask; |
| |
| if (fRasterizer->rasterize(fillPath, fillToDevMatrix, NULL, |
| fMaskFilter, &mask, |
| SkMask::kJustComputeBounds_CreateMode)) { |
| glyph->fLeft = mask.fBounds.fLeft; |
| glyph->fTop = mask.fBounds.fTop; |
| glyph->fWidth = SkToU16(mask.fBounds.width()); |
| glyph->fHeight = SkToU16(mask.fBounds.height()); |
| } else { |
| goto SK_ERROR; |
| } |
| } else { |
| // just use devPath |
| SkIRect ir; |
| devPath.getBounds().roundOut(&ir); |
| |
| if (ir.isEmpty() || !ir.is16Bit()) { |
| goto SK_ERROR; |
| } |
| glyph->fLeft = ir.fLeft; |
| glyph->fTop = ir.fTop; |
| glyph->fWidth = SkToU16(ir.width()); |
| glyph->fHeight = SkToU16(ir.height()); |
| } |
| } |
| |
| if (SkMask::kARGB32_Format != glyph->fMaskFormat) { |
| glyph->fMaskFormat = fRec.fMaskFormat; |
| } |
| |
| if (fMaskFilter) { |
| SkMask src, dst; |
| SkMatrix matrix; |
| |
| glyph->toMask(&src); |
| fRec.getMatrixFrom2x2(&matrix); |
| |
| src.fImage = NULL; // only want the bounds from the filter |
| if (fMaskFilter->filterMask(&dst, src, matrix, NULL)) { |
| SkASSERT(dst.fImage == NULL); |
| glyph->fLeft = dst.fBounds.fLeft; |
| glyph->fTop = dst.fBounds.fTop; |
| glyph->fWidth = SkToU16(dst.fBounds.width()); |
| glyph->fHeight = SkToU16(dst.fBounds.height()); |
| glyph->fMaskFormat = dst.fFormat; |
| } |
| } |
| return; |
| |
| SK_ERROR: |
| // draw nothing 'cause we failed |
| glyph->fLeft = 0; |
| glyph->fTop = 0; |
| glyph->fWidth = 0; |
| glyph->fHeight = 0; |
| // put a valid value here, in case it was earlier set to |
| // MASK_FORMAT_JUST_ADVANCE |
| glyph->fMaskFormat = fRec.fMaskFormat; |
| } |
| |
| static bool isLCD(const SkScalerContext::Rec& rec) { |
| return SkMask::kLCD16_Format == rec.fMaskFormat || |
| SkMask::kLCD32_Format == rec.fMaskFormat; |
| } |
| |
| static uint16_t a8_to_rgb565(unsigned a8) { |
| return SkPackRGB16(a8 >> 3, a8 >> 2, a8 >> 3); |
| } |
| |
| static void copyToLCD16(const SkBitmap& src, const SkMask& dst) { |
| SkASSERT(SkBitmap::kA8_Config == src.config()); |
| SkASSERT(SkMask::kLCD16_Format == dst.fFormat); |
| |
| const int width = dst.fBounds.width(); |
| const int height = dst.fBounds.height(); |
| const uint8_t* srcP = src.getAddr8(0, 0); |
| size_t srcRB = src.rowBytes(); |
| uint16_t* dstP = (uint16_t*)dst.fImage; |
| size_t dstRB = dst.fRowBytes; |
| for (int y = 0; y < height; ++y) { |
| for (int x = 0; x < width; ++x) { |
| dstP[x] = a8_to_rgb565(srcP[x]); |
| } |
| srcP += srcRB; |
| dstP = (uint16_t*)((char*)dstP + dstRB); |
| } |
| } |
| |
| #define SK_FREETYPE_LCD_LERP 160 |
| |
| static int lerp(int start, int end) { |
| SkASSERT((unsigned)SK_FREETYPE_LCD_LERP <= 256); |
| return start + ((end - start) * (SK_FREETYPE_LCD_LERP) >> 8); |
| } |
| |
| static uint16_t packLCD16(unsigned r, unsigned g, unsigned b) { |
| if (SK_FREETYPE_LCD_LERP) { |
| // want (a+b+c)/3, but we approx to avoid the divide |
| unsigned ave = (5 * (r + g + b) + g) >> 4; |
| r = lerp(r, ave); |
| g = lerp(g, ave); |
| b = lerp(b, ave); |
| } |
| return SkPackRGB16(r >> 3, g >> 2, b >> 3); |
| } |
| |
| static void pack3xHToLCD16(const SkBitmap& src, const SkMask& dst) { |
| SkASSERT(SkBitmap::kA8_Config == src.config()); |
| SkASSERT(SkMask::kLCD16_Format == dst.fFormat); |
| |
| const int width = dst.fBounds.width(); |
| const int height = dst.fBounds.height(); |
| uint16_t* dstP = (uint16_t*)dst.fImage; |
| size_t dstRB = dst.fRowBytes; |
| for (int y = 0; y < height; ++y) { |
| const uint8_t* srcP = src.getAddr8(0, y); |
| for (int x = 0; x < width; ++x) { |
| unsigned r = *srcP++; |
| unsigned g = *srcP++; |
| unsigned b = *srcP++; |
| dstP[x] = packLCD16(r, g, b); |
| } |
| dstP = (uint16_t*)((char*)dstP + dstRB); |
| } |
| } |
| |
| static void pack3xHToLCD32(const SkBitmap& src, const SkMask& dst) { |
| SkASSERT(SkBitmap::kA8_Config == src.config()); |
| SkASSERT(SkMask::kLCD32_Format == dst.fFormat); |
| |
| const int width = dst.fBounds.width(); |
| const int height = dst.fBounds.height(); |
| SkPMColor* dstP = (SkPMColor*)dst.fImage; |
| size_t dstRB = dst.fRowBytes; |
| for (int y = 0; y < height; ++y) { |
| const uint8_t* srcP = src.getAddr8(0, y); |
| for (int x = 0; x < width; ++x) { |
| unsigned r = *srcP++; |
| unsigned g = *srcP++; |
| unsigned b = *srcP++; |
| unsigned a = SkMax32(SkMax32(r, g), b); |
| dstP[x] = SkPackARGB32(a, r, g, b); |
| } |
| dstP = (SkPMColor*)((char*)dstP + dstRB); |
| } |
| } |
| |
| static void generateMask(const SkMask& mask, const SkPath& path) { |
| SkBitmap::Config config; |
| SkPaint paint; |
| |
| int srcW = mask.fBounds.width(); |
| int srcH = mask.fBounds.height(); |
| int dstW = srcW; |
| int dstH = srcH; |
| int dstRB = mask.fRowBytes; |
| |
| SkMatrix matrix; |
| matrix.setTranslate(-SkIntToScalar(mask.fBounds.fLeft), |
| -SkIntToScalar(mask.fBounds.fTop)); |
| |
| if (SkMask::kBW_Format == mask.fFormat) { |
| config = SkBitmap::kA1_Config; |
| paint.setAntiAlias(false); |
| } else { |
| config = SkBitmap::kA8_Config; |
| paint.setAntiAlias(true); |
| switch (mask.fFormat) { |
| case SkMask::kA8_Format: |
| break; |
| case SkMask::kLCD16_Format: |
| case SkMask::kLCD32_Format: |
| // TODO: trigger off LCD orientation |
| dstW *= 3; |
| matrix.postScale(SkIntToScalar(3), SK_Scalar1); |
| dstRB = 0; // signals we need a copy |
| break; |
| default: |
| SkDEBUGFAIL("unexpected mask format"); |
| } |
| } |
| |
| SkRasterClip clip; |
| clip.setRect(SkIRect::MakeWH(dstW, dstH)); |
| |
| SkBitmap bm; |
| bm.setConfig(config, dstW, dstH, dstRB); |
| |
| if (0 == dstRB) { |
| bm.allocPixels(); |
| bm.lockPixels(); |
| } else { |
| bm.setPixels(mask.fImage); |
| } |
| sk_bzero(bm.getPixels(), bm.getSafeSize()); |
| |
| SkDraw draw; |
| sk_bzero(&draw, sizeof(draw)); |
| draw.fRC = &clip; |
| draw.fClip = &clip.bwRgn(); |
| draw.fMatrix = &matrix; |
| draw.fBitmap = &bm; |
| draw.drawPath(path, paint); |
| |
| if (0 == dstRB) { |
| switch (mask.fFormat) { |
| case SkMask::kLCD16_Format: |
| pack3xHToLCD16(bm, mask); |
| break; |
| case SkMask::kLCD32_Format: |
| pack3xHToLCD32(bm, mask); |
| break; |
| default: |
| SkDEBUGFAIL("bad format for copyback"); |
| } |
| } |
| } |
| |
| void SkScalerContext::getImage(const SkGlyph& origGlyph) { |
| const SkGlyph* glyph = &origGlyph; |
| SkGlyph tmpGlyph; |
| |
| if (fMaskFilter) { // restore the prefilter bounds |
| tmpGlyph.init(origGlyph.fID); |
| |
| // need the original bounds, sans our maskfilter |
| SkMaskFilter* mf = fMaskFilter; |
| fMaskFilter = NULL; // temp disable |
| this->getMetrics(&tmpGlyph); |
| fMaskFilter = mf; // restore |
| |
| tmpGlyph.fImage = origGlyph.fImage; |
| |
| // we need the prefilter bounds to be <= filter bounds |
| SkASSERT(tmpGlyph.fWidth <= origGlyph.fWidth); |
| SkASSERT(tmpGlyph.fHeight <= origGlyph.fHeight); |
| glyph = &tmpGlyph; |
| } |
| |
| if (fGenerateImageFromPath) { |
| SkPath devPath, fillPath; |
| SkMatrix fillToDevMatrix; |
| SkMask mask; |
| |
| this->internalGetPath(*glyph, &fillPath, &devPath, &fillToDevMatrix); |
| glyph->toMask(&mask); |
| |
| if (fRasterizer) { |
| mask.fFormat = SkMask::kA8_Format; |
| sk_bzero(glyph->fImage, mask.computeImageSize()); |
| |
| if (!fRasterizer->rasterize(fillPath, fillToDevMatrix, NULL, |
| fMaskFilter, &mask, |
| SkMask::kJustRenderImage_CreateMode)) { |
| return; |
| } |
| } else { |
| generateMask(mask, devPath); |
| } |
| } else { |
| this->getGlyphContext(*glyph)->generateImage(*glyph); |
| } |
| |
| if (fMaskFilter) { |
| SkMask srcM, dstM; |
| SkMatrix matrix; |
| |
| // the src glyph image shouldn't be 3D |
| SkASSERT(SkMask::k3D_Format != glyph->fMaskFormat); |
| glyph->toMask(&srcM); |
| fRec.getMatrixFrom2x2(&matrix); |
| |
| if (fMaskFilter->filterMask(&dstM, srcM, matrix, NULL)) { |
| int width = SkFastMin32(origGlyph.fWidth, dstM.fBounds.width()); |
| int height = SkFastMin32(origGlyph.fHeight, dstM.fBounds.height()); |
| int dstRB = origGlyph.rowBytes(); |
| int srcRB = dstM.fRowBytes; |
| |
| const uint8_t* src = (const uint8_t*)dstM.fImage; |
| uint8_t* dst = (uint8_t*)origGlyph.fImage; |
| |
| if (SkMask::k3D_Format == dstM.fFormat) { |
| // we have to copy 3 times as much |
| height *= 3; |
| } |
| |
| // clean out our glyph, since it may be larger than dstM |
| //sk_bzero(dst, height * dstRB); |
| |
| while (--height >= 0) { |
| memcpy(dst, src, width); |
| src += srcRB; |
| dst += dstRB; |
| } |
| SkMask::FreeImage(dstM.fImage); |
| } |
| } |
| } |
| |
| void SkScalerContext::getPath(const SkGlyph& glyph, SkPath* path) { |
| this->internalGetPath(glyph, NULL, path, NULL); |
| } |
| |
| void SkScalerContext::getFontMetrics(SkPaint::FontMetrics* mx, |
| SkPaint::FontMetrics* my) { |
| this->generateFontMetrics(mx, my); |
| } |
| |
| SkUnichar SkScalerContext::generateGlyphToChar(uint16_t glyph) { |
| return 0; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| void SkScalerContext::internalGetPath(const SkGlyph& glyph, SkPath* fillPath, |
| SkPath* devPath, SkMatrix* fillToDevMatrix) { |
| SkPath path; |
| |
| this->getGlyphContext(glyph)->generatePath(glyph, &path); |
| |
| if (fRec.fFlags & SkScalerContext::kSubpixelPositioning_Flag) { |
| SkFixed dx = glyph.getSubXFixed(); |
| SkFixed dy = glyph.getSubYFixed(); |
| if (dx | dy) { |
| path.offset(SkFixedToScalar(dx), SkFixedToScalar(dy)); |
| } |
| } |
| |
| if (fRec.fFrameWidth > 0 || fPathEffect != NULL) { |
| // need the path in user-space, with only the point-size applied |
| // so that our stroking and effects will operate the same way they |
| // would if the user had extracted the path themself, and then |
| // called drawPath |
| SkPath localPath; |
| SkMatrix matrix, inverse; |
| |
| fRec.getMatrixFrom2x2(&matrix); |
| matrix.invert(&inverse); |
| path.transform(inverse, &localPath); |
| // now localPath is only affected by the paint settings, and not the canvas matrix |
| |
| SkScalar width = fRec.fFrameWidth; |
| |
| if (fPathEffect) { |
| SkPath effectPath; |
| |
| if (fPathEffect->filterPath(&effectPath, localPath, &width)) { |
| localPath.swap(effectPath); |
| } |
| } |
| |
| if (width > 0) { |
| SkStroke stroker; |
| SkPath outline; |
| |
| stroker.setWidth(width); |
| stroker.setMiterLimit(fRec.fMiterLimit); |
| stroker.setJoin((SkPaint::Join)fRec.fStrokeJoin); |
| stroker.setDoFill(SkToBool(fRec.fFlags & kFrameAndFill_Flag)); |
| stroker.strokePath(localPath, &outline); |
| localPath.swap(outline); |
| } |
| |
| // now return stuff to the caller |
| if (fillToDevMatrix) { |
| *fillToDevMatrix = matrix; |
| } |
| if (devPath) { |
| localPath.transform(matrix, devPath); |
| } |
| if (fillPath) { |
| fillPath->swap(localPath); |
| } |
| } else { // nothing tricky to do |
| if (fillToDevMatrix) { |
| fillToDevMatrix->reset(); |
| } |
| if (devPath) { |
| if (fillPath == NULL) { |
| devPath->swap(path); |
| } else { |
| *devPath = path; |
| } |
| } |
| |
| if (fillPath) { |
| fillPath->swap(path); |
| } |
| } |
| |
| if (devPath) { |
| devPath->updateBoundsCache(); |
| } |
| if (fillPath) { |
| fillPath->updateBoundsCache(); |
| } |
| } |
| |
| |
| void SkScalerContext::Rec::getMatrixFrom2x2(SkMatrix* dst) const { |
| dst->reset(); |
| dst->setScaleX(fPost2x2[0][0]); |
| dst->setSkewX( fPost2x2[0][1]); |
| dst->setSkewY( fPost2x2[1][0]); |
| dst->setScaleY(fPost2x2[1][1]); |
| } |
| |
| void SkScalerContext::Rec::getLocalMatrix(SkMatrix* m) const { |
| m->setScale(SkScalarMul(fTextSize, fPreScaleX), fTextSize); |
| if (fPreSkewX) { |
| m->postSkew(fPreSkewX, 0); |
| } |
| } |
| |
| void SkScalerContext::Rec::getSingleMatrix(SkMatrix* m) const { |
| this->getLocalMatrix(m); |
| |
| // now concat the device matrix |
| SkMatrix deviceMatrix; |
| this->getMatrixFrom2x2(&deviceMatrix); |
| m->postConcat(deviceMatrix); |
| } |
| |
| SkAxisAlignment SkComputeAxisAlignmentForHText(const SkMatrix& matrix) { |
| SkASSERT(!matrix.hasPerspective()); |
| |
| if (0 == matrix[SkMatrix::kMSkewY]) { |
| return kX_SkAxisAlignment; |
| } |
| if (0 == matrix[SkMatrix::kMScaleX]) { |
| return kY_SkAxisAlignment; |
| } |
| return kNone_SkAxisAlignment; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkFontHost.h" |
| |
| class SkScalerContext_Empty : public SkScalerContext { |
| public: |
| SkScalerContext_Empty(const SkDescriptor* desc) : SkScalerContext(desc) {} |
| |
| protected: |
| virtual unsigned generateGlyphCount() { |
| return 0; |
| } |
| virtual uint16_t generateCharToGlyph(SkUnichar uni) { |
| return 0; |
| } |
| virtual void generateAdvance(SkGlyph* glyph) { |
| glyph->zeroMetrics(); |
| } |
| virtual void generateMetrics(SkGlyph* glyph) { |
| glyph->zeroMetrics(); |
| } |
| virtual void generateImage(const SkGlyph& glyph) {} |
| virtual void generatePath(const SkGlyph& glyph, SkPath* path) {} |
| virtual void generateFontMetrics(SkPaint::FontMetrics* mx, |
| SkPaint::FontMetrics* my) { |
| if (mx) { |
| sk_bzero(mx, sizeof(*mx)); |
| } |
| if (my) { |
| sk_bzero(my, sizeof(*my)); |
| } |
| } |
| }; |
| |
| extern SkScalerContext* SkCreateColorScalerContext(const SkDescriptor* desc); |
| |
| SkScalerContext* SkScalerContext::Create(const SkDescriptor* desc) { |
| SkScalerContext* c = NULL; //SkCreateColorScalerContext(desc); |
| if (NULL == c) { |
| c = SkFontHost::CreateScalerContext(desc); |
| } |
| if (NULL == c) { |
| c = SkNEW_ARGS(SkScalerContext_Empty, (desc)); |
| } |
| return c; |
| } |
| |