| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "GrStencilAndCoverTextContext.h" |
| #include "GrDrawTarget.h" |
| #include "GrGpu.h" |
| #include "GrPath.h" |
| #include "GrPathRange.h" |
| #include "SkAutoKern.h" |
| #include "SkDraw.h" |
| #include "SkDrawProcs.h" |
| #include "SkGlyphCache.h" |
| #include "SkGpuDevice.h" |
| #include "SkPath.h" |
| #include "SkTextMapStateProc.h" |
| #include "SkTextFormatParams.h" |
| |
| GrStencilAndCoverTextContext::GrStencilAndCoverTextContext( |
| GrContext* context, const SkDeviceProperties& properties) |
| : GrTextContext(context, properties) |
| , fPendingGlyphCount(0) { |
| } |
| |
| GrStencilAndCoverTextContext::~GrStencilAndCoverTextContext() { |
| } |
| |
| void GrStencilAndCoverTextContext::drawText(const GrPaint& paint, |
| const SkPaint& skPaint, |
| const char text[], |
| size_t byteLength, |
| SkScalar x, SkScalar y) { |
| SkASSERT(byteLength == 0 || text != NULL); |
| |
| if (text == NULL || byteLength == 0 /*|| fRC->isEmpty()*/) { |
| return; |
| } |
| |
| // This is the slow path, mainly used by Skia unit tests. The other |
| // backends (8888, gpu, ...) use device-space dependent glyph caches. In |
| // order to match the glyph positions that the other code paths produce, we |
| // must also use device-space dependent glyph cache. This has the |
| // side-effect that the glyph shape outline will be in device-space, |
| // too. This in turn has the side-effect that NVPR can not stroke the paths, |
| // as the stroke in NVPR is defined in object-space. |
| // NOTE: here we have following coincidence that works at the moment: |
| // - When using the device-space glyphs, the transforms we pass to NVPR |
| // instanced drawing are the global transforms, and the view transform is |
| // identity. NVPR can not use non-affine transforms in the instanced |
| // drawing. This is taken care of by SkDraw::ShouldDrawTextAsPaths since it |
| // will turn off the use of device-space glyphs when perspective transforms |
| // are in use. |
| |
| this->init(paint, skPaint, byteLength, kMaxAccuracy_RenderMode); |
| |
| // Transform our starting point. |
| if (fNeedsDeviceSpaceGlyphs) { |
| SkPoint loc; |
| fContextInitialMatrix.mapXY(x, y, &loc); |
| x = loc.fX; |
| y = loc.fY; |
| } |
| |
| SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc(); |
| |
| fTransformType = GrPathRendering::kTranslate_PathTransformType; |
| |
| const char* stop = text + byteLength; |
| |
| // Measure first if needed. |
| if (fSkPaint.getTextAlign() != SkPaint::kLeft_Align) { |
| SkFixed stopX = 0; |
| SkFixed stopY = 0; |
| |
| const char* textPtr = text; |
| while (textPtr < stop) { |
| // We don't need x, y here, since all subpixel variants will have the |
| // same advance. |
| const SkGlyph& glyph = glyphCacheProc(fGlyphCache, &textPtr, 0, 0); |
| |
| stopX += glyph.fAdvanceX; |
| stopY += glyph.fAdvanceY; |
| } |
| SkASSERT(textPtr == stop); |
| |
| SkScalar alignX = SkFixedToScalar(stopX) * fTextRatio; |
| SkScalar alignY = SkFixedToScalar(stopY) * fTextRatio; |
| |
| if (fSkPaint.getTextAlign() == SkPaint::kCenter_Align) { |
| alignX = SkScalarHalf(alignX); |
| alignY = SkScalarHalf(alignY); |
| } |
| |
| x -= alignX; |
| y -= alignY; |
| } |
| |
| SkAutoKern autokern; |
| |
| SkFixed fixedSizeRatio = SkScalarToFixed(fTextRatio); |
| |
| SkFixed fx = SkScalarToFixed(x); |
| SkFixed fy = SkScalarToFixed(y); |
| while (text < stop) { |
| const SkGlyph& glyph = glyphCacheProc(fGlyphCache, &text, 0, 0); |
| fx += SkFixedMul_portable(autokern.adjust(glyph), fixedSizeRatio); |
| if (glyph.fWidth) { |
| this->appendGlyph(glyph.getGlyphID(), SkFixedToScalar(fx), SkFixedToScalar(fy)); |
| } |
| |
| fx += SkFixedMul_portable(glyph.fAdvanceX, fixedSizeRatio); |
| fy += SkFixedMul_portable(glyph.fAdvanceY, fixedSizeRatio); |
| } |
| |
| this->finish(); |
| } |
| |
| void GrStencilAndCoverTextContext::drawPosText(const GrPaint& paint, |
| const SkPaint& skPaint, |
| const char text[], |
| size_t byteLength, |
| const SkScalar pos[], |
| SkScalar constY, |
| int scalarsPerPosition) { |
| SkASSERT(byteLength == 0 || text != NULL); |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); |
| |
| // nothing to draw |
| if (text == NULL || byteLength == 0/* || fRC->isEmpty()*/) { |
| return; |
| } |
| |
| // This is the fast path. Here we do not bake in the device-transform to |
| // the glyph outline or the advances. This is because we do not need to |
| // position the glyphs at all, since the caller has done the positioning. |
| // The positioning is based on SkPaint::measureText of individual |
| // glyphs. That already uses glyph cache without device transforms. Device |
| // transform is not part of SkPaint::measureText API, and thus we use the |
| // same glyphs as what were measured. |
| |
| const float textTranslateY = (1 == scalarsPerPosition ? constY : 0); |
| this->init(paint, skPaint, byteLength, kMaxPerformance_RenderMode, textTranslateY); |
| |
| SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc(); |
| |
| const char* stop = text + byteLength; |
| |
| if (SkPaint::kLeft_Align == fSkPaint.getTextAlign()) { |
| if (1 == scalarsPerPosition) { |
| fTransformType = GrPathRendering::kTranslateX_PathTransformType; |
| while (text < stop) { |
| const SkGlyph& glyph = glyphCacheProc(fGlyphCache, &text, 0, 0); |
| if (glyph.fWidth) { |
| this->appendGlyph(glyph.getGlyphID(), *pos); |
| } |
| pos++; |
| } |
| } else { |
| SkASSERT(2 == scalarsPerPosition); |
| fTransformType = GrPathRendering::kTranslate_PathTransformType; |
| while (text < stop) { |
| const SkGlyph& glyph = glyphCacheProc(fGlyphCache, &text, 0, 0); |
| if (glyph.fWidth) { |
| this->appendGlyph(glyph.getGlyphID(), pos[0], pos[1]); |
| } |
| pos += 2; |
| } |
| } |
| } else { |
| fTransformType = GrPathRendering::kTranslate_PathTransformType; |
| SkTextMapStateProc tmsProc(SkMatrix::I(), 0, scalarsPerPosition); |
| SkTextAlignProcScalar alignProc(fSkPaint.getTextAlign()); |
| while (text < stop) { |
| const SkGlyph& glyph = glyphCacheProc(fGlyphCache, &text, 0, 0); |
| if (glyph.fWidth) { |
| SkPoint tmsLoc; |
| tmsProc(pos, &tmsLoc); |
| SkPoint loc; |
| alignProc(tmsLoc, glyph, &loc); |
| |
| this->appendGlyph(glyph.getGlyphID(), loc.x(), loc.y()); |
| } |
| pos += scalarsPerPosition; |
| } |
| } |
| |
| this->finish(); |
| } |
| |
| bool GrStencilAndCoverTextContext::canDraw(const SkPaint& paint) { |
| if (paint.getRasterizer()) { |
| return false; |
| } |
| if (paint.getMaskFilter()) { |
| return false; |
| } |
| if (paint.getPathEffect()) { |
| return false; |
| } |
| |
| // No hairlines unless we can map the 1 px width to the object space. |
| if (paint.getStyle() == SkPaint::kStroke_Style |
| && paint.getStrokeWidth() == 0 |
| && fContext->getMatrix().hasPerspective()) { |
| return false; |
| } |
| |
| // No color bitmap fonts. |
| SkScalerContext::Rec rec; |
| SkScalerContext::MakeRec(paint, &fDeviceProperties, NULL, &rec); |
| return rec.getFormat() != SkMask::kARGB32_Format; |
| } |
| |
| static GrPathRange* get_gr_glyphs(GrContext* ctx, |
| const SkTypeface* typeface, |
| const SkDescriptor* desc, |
| const SkStrokeRec& stroke) { |
| static const GrCacheID::Domain gGlyphsDomain = GrCacheID::GenerateDomain(); |
| |
| GrCacheID::Key key; |
| uint64_t* keyData = key.fData64; |
| keyData[0] = desc ? desc->getChecksum() : 0; |
| keyData[0] = (keyData[0] << 32) | (typeface ? typeface->uniqueID() : 0); |
| keyData[1] = GrPath::ComputeStrokeKey(stroke); |
| GrResourceKey resourceKey = GrResourceKey(GrCacheID(gGlyphsDomain, key), |
| GrPathRange::resourceType(), 0); |
| |
| SkAutoTUnref<GrPathRange> glyphs( |
| static_cast<GrPathRange*>(ctx->findAndRefCachedResource(resourceKey))); |
| if (NULL == glyphs || (NULL != desc && !glyphs->isEqualTo(*desc))) { |
| glyphs.reset(ctx->getGpu()->pathRendering()->createGlyphs(typeface, desc, stroke)); |
| ctx->addResourceToCache(resourceKey, glyphs); |
| } |
| |
| return glyphs.detach(); |
| } |
| |
| void GrStencilAndCoverTextContext::init(const GrPaint& paint, |
| const SkPaint& skPaint, |
| size_t textByteLength, |
| RenderMode renderMode, |
| SkScalar textTranslateY) { |
| GrTextContext::init(paint, skPaint); |
| |
| fContextInitialMatrix = fContext->getMatrix(); |
| |
| const bool otherBackendsWillDrawAsPaths = |
| SkDraw::ShouldDrawTextAsPaths(skPaint, fContextInitialMatrix); |
| |
| fNeedsDeviceSpaceGlyphs = !otherBackendsWillDrawAsPaths && |
| kMaxAccuracy_RenderMode == renderMode && |
| SkToBool(fContextInitialMatrix.getType() & |
| (SkMatrix::kScale_Mask | SkMatrix::kAffine_Mask)); |
| |
| if (fNeedsDeviceSpaceGlyphs) { |
| // SkDraw::ShouldDrawTextAsPaths takes care of perspective transforms. |
| SkASSERT(!fContextInitialMatrix.hasPerspective()); |
| SkASSERT(0 == textTranslateY); // TODO: Handle textTranslateY in device-space usecase. |
| |
| fTextRatio = fTextInverseRatio = 1.0f; |
| |
| // Glyphs loaded by GPU path rendering have an inverted y-direction. |
| SkMatrix m; |
| m.setScale(1, -1); |
| fContext->setMatrix(m); |
| |
| // Post-flip the initial matrix so we're left with just the flip after |
| // the paint preConcats the inverse. |
| m = fContextInitialMatrix; |
| m.postScale(1, -1); |
| fPaint.localCoordChangeInverse(m); |
| |
| // The whole shape (including stroke) will be baked into the glyph outlines. Make |
| // NVPR just fill the baked shapes. |
| fGlyphCache = fSkPaint.detachCache(&fDeviceProperties, &fContextInitialMatrix, false); |
| fGlyphs = get_gr_glyphs(fContext, fGlyphCache->getScalerContext()->getTypeface(), |
| &fGlyphCache->getDescriptor(), |
| SkStrokeRec(SkStrokeRec::kFill_InitStyle)); |
| } else { |
| // Don't bake strokes into the glyph outlines. We will stroke the glyphs |
| // using the GPU instead. This is the fast path. |
| SkStrokeRec gpuStroke = SkStrokeRec(fSkPaint); |
| fSkPaint.setStyle(SkPaint::kFill_Style); |
| |
| if (gpuStroke.isHairlineStyle()) { |
| // Approximate hairline stroke. |
| SkScalar strokeWidth = SK_Scalar1 / |
| (SkVector::Make(fContextInitialMatrix.getScaleX(), |
| fContextInitialMatrix.getSkewY()).length()); |
| gpuStroke.setStrokeStyle(strokeWidth, false /*strokeAndFill*/); |
| |
| } else if (fSkPaint.isFakeBoldText() && |
| #ifdef SK_USE_FREETYPE_EMBOLDEN |
| kMaxPerformance_RenderMode == renderMode && |
| #endif |
| SkStrokeRec::kStroke_Style != gpuStroke.getStyle()) { |
| |
| // Instead of baking fake bold into the glyph outlines, do it with the GPU stroke. |
| SkScalar fakeBoldScale = SkScalarInterpFunc(fSkPaint.getTextSize(), |
| kStdFakeBoldInterpKeys, |
| kStdFakeBoldInterpValues, |
| kStdFakeBoldInterpLength); |
| SkScalar extra = SkScalarMul(fSkPaint.getTextSize(), fakeBoldScale); |
| gpuStroke.setStrokeStyle(gpuStroke.needToApply() ? gpuStroke.getWidth() + extra : extra, |
| true /*strokeAndFill*/); |
| |
| fSkPaint.setFakeBoldText(false); |
| } |
| |
| bool canUseRawPaths; |
| |
| if (otherBackendsWillDrawAsPaths || kMaxPerformance_RenderMode == renderMode) { |
| // We can draw the glyphs from canonically sized paths. |
| fTextRatio = fSkPaint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths; |
| fTextInverseRatio = SkPaint::kCanonicalTextSizeForPaths / fSkPaint.getTextSize(); |
| |
| // Compensate for the glyphs being scaled by fTextRatio. |
| if (!gpuStroke.isFillStyle()) { |
| gpuStroke.setStrokeStyle(gpuStroke.getWidth() / fTextRatio, |
| SkStrokeRec::kStrokeAndFill_Style == gpuStroke.getStyle()); |
| } |
| |
| fSkPaint.setLinearText(true); |
| fSkPaint.setLCDRenderText(false); |
| fSkPaint.setAutohinted(false); |
| fSkPaint.setHinting(SkPaint::kNo_Hinting); |
| fSkPaint.setSubpixelText(true); |
| fSkPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths)); |
| |
| canUseRawPaths = SK_Scalar1 == fSkPaint.getTextScaleX() && |
| 0 == fSkPaint.getTextSkewX() && |
| !fSkPaint.isFakeBoldText() && |
| !fSkPaint.isVerticalText(); |
| } else { |
| fTextRatio = fTextInverseRatio = 1.0f; |
| canUseRawPaths = false; |
| } |
| |
| SkMatrix textMatrix; |
| textMatrix.setTranslate(0, textTranslateY); |
| // Glyphs loaded by GPU path rendering have an inverted y-direction. |
| textMatrix.preScale(fTextRatio, -fTextRatio); |
| fPaint.localCoordChange(textMatrix); |
| fContext->concatMatrix(textMatrix); |
| |
| fGlyphCache = fSkPaint.detachCache(&fDeviceProperties, NULL, false); |
| fGlyphs = canUseRawPaths ? |
| get_gr_glyphs(fContext, fSkPaint.getTypeface(), NULL, gpuStroke) : |
| get_gr_glyphs(fContext, fGlyphCache->getScalerContext()->getTypeface(), |
| &fGlyphCache->getDescriptor(), gpuStroke); |
| } |
| |
| fStateRestore.set(fDrawTarget->drawState()); |
| |
| fDrawTarget->drawState()->setFromPaint(fPaint, fContext->getMatrix(), |
| fContext->getRenderTarget()); |
| |
| GR_STATIC_CONST_SAME_STENCIL(kStencilPass, |
| kZero_StencilOp, |
| kZero_StencilOp, |
| kNotEqual_StencilFunc, |
| 0xffff, |
| 0x0000, |
| 0xffff); |
| |
| *fDrawTarget->drawState()->stencil() = kStencilPass; |
| |
| SkASSERT(0 == fPendingGlyphCount); |
| } |
| |
| inline void GrStencilAndCoverTextContext::appendGlyph(uint16_t glyphID, float x) { |
| SkASSERT(GrPathRendering::kTranslateX_PathTransformType == fTransformType); |
| |
| if (fPendingGlyphCount >= kGlyphBufferSize) { |
| this->flush(); |
| } |
| |
| fIndexBuffer[fPendingGlyphCount] = glyphID; |
| fTransformBuffer[fPendingGlyphCount] = fTextInverseRatio * x; |
| |
| ++fPendingGlyphCount; |
| } |
| |
| inline void GrStencilAndCoverTextContext::appendGlyph(uint16_t glyphID, float x, float y) { |
| SkASSERT(GrPathRendering::kTranslate_PathTransformType == fTransformType); |
| |
| if (fPendingGlyphCount >= kGlyphBufferSize) { |
| this->flush(); |
| } |
| |
| fIndexBuffer[fPendingGlyphCount] = glyphID; |
| fTransformBuffer[2 * fPendingGlyphCount] = fTextInverseRatio * x; |
| fTransformBuffer[2 * fPendingGlyphCount + 1] = -fTextInverseRatio * y; |
| |
| ++fPendingGlyphCount; |
| } |
| |
| void GrStencilAndCoverTextContext::flush() { |
| if (0 == fPendingGlyphCount) { |
| return; |
| } |
| |
| fDrawTarget->drawPaths(fGlyphs, fIndexBuffer, fPendingGlyphCount, |
| fTransformBuffer, fTransformType, SkPath::kWinding_FillType); |
| |
| fPendingGlyphCount = 0; |
| } |
| |
| void GrStencilAndCoverTextContext::finish() { |
| this->flush(); |
| |
| fGlyphs->unref(); |
| fGlyphs = NULL; |
| |
| SkGlyphCache::AttachCache(fGlyphCache); |
| fGlyphCache = NULL; |
| |
| fDrawTarget->drawState()->stencil()->setDisabled(); |
| fStateRestore.set(NULL); |
| fContext->setMatrix(fContextInitialMatrix); |
| GrTextContext::finish(); |
| } |
| |
