| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "GrAtlasTextContext.h" |
| |
| #include "GrDrawContext.h" |
| #include "GrDrawTarget.h" |
| #include "GrFontScaler.h" |
| #include "GrStrokeInfo.h" |
| #include "GrTextBlobCache.h" |
| #include "GrTexturePriv.h" |
| #include "GrVertexBuffer.h" |
| |
| #include "SkAutoKern.h" |
| #include "SkColorPriv.h" |
| #include "SkColorFilter.h" |
| #include "SkDistanceFieldGen.h" |
| #include "SkDraw.h" |
| #include "SkDrawFilter.h" |
| #include "SkDrawProcs.h" |
| #include "SkFindAndPlaceGlyph.h" |
| #include "SkGlyphCache.h" |
| #include "SkGpuDevice.h" |
| #include "SkGrPriv.h" |
| #include "SkPath.h" |
| #include "SkRTConf.h" |
| #include "SkStrokeRec.h" |
| #include "SkTextBlob.h" |
| #include "SkTextMapStateProc.h" |
| |
| #include "batches/GrAtlasTextBatch.h" |
| |
| namespace { |
| static const int kMinDFFontSize = 18; |
| static const int kSmallDFFontSize = 32; |
| static const int kSmallDFFontLimit = 32; |
| static const int kMediumDFFontSize = 72; |
| static const int kMediumDFFontLimit = 72; |
| static const int kLargeDFFontSize = 162; |
| #ifdef SK_BUILD_FOR_ANDROID |
| static const int kLargeDFFontLimit = 384; |
| #else |
| static const int kLargeDFFontLimit = 2 * kLargeDFFontSize; |
| #endif |
| }; |
| |
| GrAtlasTextContext::GrAtlasTextContext(GrContext* context, const SkSurfaceProps& surfaceProps) |
| : INHERITED(context, surfaceProps) |
| , fDistanceAdjustTable(new GrDistanceFieldAdjustTable) { |
| // We overallocate vertices in our textblobs based on the assumption that A8 has the greatest |
| // vertexStride |
| static_assert(GrAtlasTextBlob::kGrayTextVASize >= GrAtlasTextBlob::kColorTextVASize && |
| GrAtlasTextBlob::kGrayTextVASize >= GrAtlasTextBlob::kLCDTextVASize, |
| "vertex_attribute_changed"); |
| fCurrStrike = nullptr; |
| fCache = context->getTextBlobCache(); |
| } |
| |
| |
| GrAtlasTextContext* GrAtlasTextContext::Create(GrContext* context, |
| const SkSurfaceProps& surfaceProps) { |
| return new GrAtlasTextContext(context, surfaceProps); |
| } |
| |
| bool GrAtlasTextContext::canDraw(const SkPaint& skPaint, const SkMatrix& viewMatrix) { |
| return this->canDrawAsDistanceFields(skPaint, viewMatrix) || |
| !SkDraw::ShouldDrawTextAsPaths(skPaint, viewMatrix); |
| } |
| |
| GrColor GrAtlasTextContext::ComputeCanonicalColor(const SkPaint& paint, bool lcd) { |
| GrColor canonicalColor = paint.computeLuminanceColor(); |
| if (lcd) { |
| // This is the correct computation, but there are tons of cases where LCD can be overridden. |
| // For now we just regenerate if any run in a textblob has LCD. |
| // TODO figure out where all of these overrides are and see if we can incorporate that logic |
| // at a higher level *OR* use sRGB |
| SkASSERT(false); |
| //canonicalColor = SkMaskGamma::CanonicalColor(canonicalColor); |
| } else { |
| // A8, though can have mixed BMP text but it shouldn't matter because BMP text won't have |
| // gamma corrected masks anyways, nor color |
| U8CPU lum = SkComputeLuminance(SkColorGetR(canonicalColor), |
| SkColorGetG(canonicalColor), |
| SkColorGetB(canonicalColor)); |
| // reduce to our finite number of bits |
| canonicalColor = SkMaskGamma::CanonicalColor(SkColorSetRGB(lum, lum, lum)); |
| } |
| return canonicalColor; |
| } |
| |
| // TODO if this function ever shows up in profiling, then we can compute this value when the |
| // textblob is being built and cache it. However, for the time being textblobs mostly only have 1 |
| // run so this is not a big deal to compute here. |
| bool GrAtlasTextContext::HasLCD(const SkTextBlob* blob) { |
| SkTextBlobRunIterator it(blob); |
| for (; !it.done(); it.next()) { |
| if (it.isLCD()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| inline SkGlyphCache* GrAtlasTextContext::setupCache(GrAtlasTextBlob::Run* run, |
| const SkPaint& skPaint, |
| const SkMatrix* viewMatrix, |
| bool noGamma) { |
| skPaint.getScalerContextDescriptor(&run->fDescriptor, fSurfaceProps, viewMatrix, noGamma); |
| run->fTypeface.reset(SkSafeRef(skPaint.getTypeface())); |
| return SkGlyphCache::DetachCache(run->fTypeface, run->fDescriptor.getDesc()); |
| } |
| |
| void GrAtlasTextContext::drawTextBlob(GrDrawContext* dc, |
| const GrClip& clip, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, const SkTextBlob* blob, |
| SkScalar x, SkScalar y, |
| SkDrawFilter* drawFilter, const SkIRect& clipBounds) { |
| // If we have been abandoned, then don't draw |
| if (fContext->abandoned()) { |
| return; |
| } |
| |
| SkAutoTUnref<GrAtlasTextBlob> cacheBlob; |
| SkMaskFilter::BlurRec blurRec; |
| GrAtlasTextBlob::Key key; |
| // It might be worth caching these things, but its not clear at this time |
| // TODO for animated mask filters, this will fill up our cache. We need a safeguard here |
| const SkMaskFilter* mf = skPaint.getMaskFilter(); |
| bool canCache = !(skPaint.getPathEffect() || |
| (mf && !mf->asABlur(&blurRec)) || |
| drawFilter); |
| |
| if (canCache) { |
| bool hasLCD = HasLCD(blob); |
| |
| // We canonicalize all non-lcd draws to use kUnknown_SkPixelGeometry |
| SkPixelGeometry pixelGeometry = hasLCD ? fSurfaceProps.pixelGeometry() : |
| kUnknown_SkPixelGeometry; |
| |
| // TODO we want to figure out a way to be able to use the canonical color on LCD text, |
| // see the note on ComputeCanonicalColor above. We pick a dummy value for LCD text to |
| // ensure we always match the same key |
| GrColor canonicalColor = hasLCD ? SK_ColorTRANSPARENT : |
| ComputeCanonicalColor(skPaint, hasLCD); |
| |
| key.fPixelGeometry = pixelGeometry; |
| key.fUniqueID = blob->uniqueID(); |
| key.fStyle = skPaint.getStyle(); |
| key.fHasBlur = SkToBool(mf); |
| key.fCanonicalColor = canonicalColor; |
| cacheBlob.reset(SkSafeRef(fCache->find(key))); |
| } |
| |
| SkScalar transX = 0.f; |
| SkScalar transY = 0.f; |
| |
| // Though for the time being runs in the textblob can override the paint, they only touch font |
| // info. |
| GrPaint grPaint; |
| if (!SkPaintToGrPaint(fContext, skPaint, viewMatrix, &grPaint)) { |
| return; |
| } |
| |
| if (cacheBlob) { |
| if (cacheBlob->mustRegenerate(&transX, &transY, skPaint, grPaint.getColor(), blurRec, |
| viewMatrix, x, y)) { |
| // We have to remake the blob because changes may invalidate our masks. |
| // TODO we could probably get away reuse most of the time if the pointer is unique, |
| // but we'd have to clear the subrun information |
| fCache->remove(cacheBlob); |
| cacheBlob.reset(SkRef(fCache->createCachedBlob(blob, key, blurRec, skPaint, |
| GrAtlasTextBlob::kGrayTextVASize))); |
| this->regenerateTextBlob(cacheBlob, skPaint, grPaint.getColor(), viewMatrix, |
| blob, x, y, drawFilter, clip); |
| } else { |
| fCache->makeMRU(cacheBlob); |
| #ifdef CACHE_SANITY_CHECK |
| { |
| int glyphCount = 0; |
| int runCount = 0; |
| GrTextBlobCache::BlobGlyphCount(&glyphCount, &runCount, blob); |
| SkAutoTUnref<GrAtlasTextBlob> sanityBlob(fCache->createBlob(glyphCount, runCount, |
| kGrayTextVASize)); |
| GrTextBlobCache::SetupCacheBlobKey(sanityBlob, key, blurRec, skPaint); |
| this->regenerateTextBlob(sanityBlob, skPaint, grPaint.getColor(), viewMatrix, |
| blob, x, y, drawFilter, clip); |
| GrAtlasTextBlob::AssertEqual(*sanityBlob, *cacheBlob); |
| } |
| |
| #endif |
| } |
| } else { |
| if (canCache) { |
| cacheBlob.reset(SkRef(fCache->createCachedBlob(blob, key, blurRec, skPaint, |
| GrAtlasTextBlob::kGrayTextVASize))); |
| } else { |
| cacheBlob.reset(fCache->createBlob(blob, GrAtlasTextBlob::kGrayTextVASize)); |
| } |
| this->regenerateTextBlob(cacheBlob, skPaint, grPaint.getColor(), viewMatrix, |
| blob, x, y, drawFilter, clip); |
| } |
| |
| cacheBlob->flushCached(blob, fContext, dc, this, fSurfaceProps, fDistanceAdjustTable, skPaint, |
| grPaint, drawFilter, clip, viewMatrix, clipBounds, x, y, transX, transY); |
| } |
| |
| inline bool GrAtlasTextContext::canDrawAsDistanceFields(const SkPaint& skPaint, |
| const SkMatrix& viewMatrix) { |
| // TODO: support perspective (need getMaxScale replacement) |
| if (viewMatrix.hasPerspective()) { |
| return false; |
| } |
| |
| SkScalar maxScale = viewMatrix.getMaxScale(); |
| SkScalar scaledTextSize = maxScale*skPaint.getTextSize(); |
| // Hinted text looks far better at small resolutions |
| // Scaling up beyond 2x yields undesireable artifacts |
| if (scaledTextSize < kMinDFFontSize || scaledTextSize > kLargeDFFontLimit) { |
| return false; |
| } |
| |
| bool useDFT = fSurfaceProps.isUseDeviceIndependentFonts(); |
| #if SK_FORCE_DISTANCE_FIELD_TEXT |
| useDFT = true; |
| #endif |
| |
| if (!useDFT && scaledTextSize < kLargeDFFontSize) { |
| return false; |
| } |
| |
| // rasterizers and mask filters modify alpha, which doesn't |
| // translate well to distance |
| if (skPaint.getRasterizer() || skPaint.getMaskFilter() || |
| !fContext->caps()->shaderCaps()->shaderDerivativeSupport()) { |
| return false; |
| } |
| |
| // TODO: add some stroking support |
| if (skPaint.getStyle() != SkPaint::kFill_Style) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void GrAtlasTextContext::regenerateTextBlob(GrAtlasTextBlob* cacheBlob, |
| const SkPaint& skPaint, GrColor color, |
| const SkMatrix& viewMatrix, |
| const SkTextBlob* blob, SkScalar x, SkScalar y, |
| SkDrawFilter* drawFilter, |
| const GrClip& clip) { |
| // The color here is the GrPaint color, and it is used to determine whether we |
| // have to regenerate LCD text blobs. |
| // We use this color vs the SkPaint color because it has the colorfilter applied. |
| cacheBlob->fPaintColor = color; |
| cacheBlob->fViewMatrix = viewMatrix; |
| cacheBlob->fX = x; |
| cacheBlob->fY = y; |
| |
| // Regenerate textblob |
| SkPaint runPaint = skPaint; |
| SkTextBlobRunIterator it(blob); |
| for (int run = 0; !it.done(); it.next(), run++) { |
| int glyphCount = it.glyphCount(); |
| size_t textLen = glyphCount * sizeof(uint16_t); |
| const SkPoint& offset = it.offset(); |
| // applyFontToPaint() always overwrites the exact same attributes, |
| // so it is safe to not re-seed the paint for this reason. |
| it.applyFontToPaint(&runPaint); |
| |
| if (drawFilter && !drawFilter->filter(&runPaint, SkDrawFilter::kText_Type)) { |
| // A false return from filter() means we should abort the current draw. |
| runPaint = skPaint; |
| continue; |
| } |
| |
| runPaint.setFlags(FilterTextFlags(fSurfaceProps, runPaint)); |
| |
| cacheBlob->push_back_run(run); |
| |
| if (this->canDrawAsDistanceFields(runPaint, viewMatrix)) { |
| cacheBlob->setHasDistanceField(); |
| SkPaint dfPaint = runPaint; |
| SkScalar textRatio; |
| this->initDistanceFieldPaint(cacheBlob, &dfPaint, &textRatio, viewMatrix); |
| Run& runIdx = cacheBlob->fRuns[run]; |
| PerSubRunInfo& subRun = runIdx.fSubRunInfo.back(); |
| subRun.setUseLCDText(runPaint.isLCDRenderText()); |
| subRun.setDrawAsDistanceFields(); |
| |
| SkTDArray<char> fallbackTxt; |
| SkTDArray<SkScalar> fallbackPos; |
| SkPoint dfOffset; |
| int scalarsPerPosition = 2; |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: { |
| this->internalDrawDFText(cacheBlob, run, dfPaint, color, viewMatrix, |
| (const char *)it.glyphs(), textLen, |
| x + offset.x(), y + offset.y(), textRatio, |
| &fallbackTxt, &fallbackPos, &dfOffset, runPaint); |
| break; |
| } |
| case SkTextBlob::kHorizontal_Positioning: { |
| scalarsPerPosition = 1; |
| dfOffset = SkPoint::Make(x, y + offset.y()); |
| this->internalDrawDFPosText(cacheBlob, run, dfPaint, color, viewMatrix, |
| (const char*)it.glyphs(), textLen, it.pos(), |
| scalarsPerPosition, dfOffset, textRatio, |
| &fallbackTxt, &fallbackPos); |
| break; |
| } |
| case SkTextBlob::kFull_Positioning: { |
| dfOffset = SkPoint::Make(x, y); |
| this->internalDrawDFPosText(cacheBlob, run, dfPaint, color, viewMatrix, |
| (const char*)it.glyphs(), textLen, it.pos(), |
| scalarsPerPosition, dfOffset, textRatio, |
| &fallbackTxt, &fallbackPos); |
| break; |
| } |
| } |
| if (fallbackTxt.count()) { |
| this->fallbackDrawPosText(cacheBlob, run, clip, color, runPaint, viewMatrix, |
| fallbackTxt, fallbackPos, scalarsPerPosition, dfOffset); |
| } |
| } else if (SkDraw::ShouldDrawTextAsPaths(runPaint, viewMatrix)) { |
| cacheBlob->fRuns[run].fDrawAsPaths = true; |
| } else { |
| cacheBlob->setHasBitmap(); |
| SkGlyphCache* cache = this->setupCache(&cacheBlob->fRuns[run], runPaint, &viewMatrix, |
| false); |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: |
| this->internalDrawBMPText(cacheBlob, run, cache, runPaint, color, viewMatrix, |
| (const char *)it.glyphs(), textLen, |
| x + offset.x(), y + offset.y()); |
| break; |
| case SkTextBlob::kHorizontal_Positioning: |
| this->internalDrawBMPPosText(cacheBlob, run, cache, runPaint, color, viewMatrix, |
| (const char*)it.glyphs(), textLen, it.pos(), 1, |
| SkPoint::Make(x, y + offset.y())); |
| break; |
| case SkTextBlob::kFull_Positioning: |
| this->internalDrawBMPPosText(cacheBlob, run, cache, runPaint, color, viewMatrix, |
| (const char*)it.glyphs(), textLen, it.pos(), 2, |
| SkPoint::Make(x, y)); |
| break; |
| } |
| SkGlyphCache::AttachCache(cache); |
| } |
| |
| if (drawFilter) { |
| // A draw filter may change the paint arbitrarily, so we must re-seed in this case. |
| runPaint = skPaint; |
| } |
| } |
| } |
| |
| inline void GrAtlasTextContext::initDistanceFieldPaint(GrAtlasTextBlob* blob, |
| SkPaint* skPaint, |
| SkScalar* textRatio, |
| const SkMatrix& viewMatrix) { |
| // getMaxScale doesn't support perspective, so neither do we at the moment |
| SkASSERT(!viewMatrix.hasPerspective()); |
| SkScalar maxScale = viewMatrix.getMaxScale(); |
| SkScalar textSize = skPaint->getTextSize(); |
| SkScalar scaledTextSize = textSize; |
| // if we have non-unity scale, we need to choose our base text size |
| // based on the SkPaint's text size multiplied by the max scale factor |
| // TODO: do we need to do this if we're scaling down (i.e. maxScale < 1)? |
| if (maxScale > 0 && !SkScalarNearlyEqual(maxScale, SK_Scalar1)) { |
| scaledTextSize *= maxScale; |
| } |
| |
| // We have three sizes of distance field text, and within each size 'bucket' there is a floor |
| // and ceiling. A scale outside of this range would require regenerating the distance fields |
| SkScalar dfMaskScaleFloor; |
| SkScalar dfMaskScaleCeil; |
| if (scaledTextSize <= kSmallDFFontLimit) { |
| dfMaskScaleFloor = kMinDFFontSize; |
| dfMaskScaleCeil = kSmallDFFontLimit; |
| *textRatio = textSize / kSmallDFFontSize; |
| skPaint->setTextSize(SkIntToScalar(kSmallDFFontSize)); |
| } else if (scaledTextSize <= kMediumDFFontLimit) { |
| dfMaskScaleFloor = kSmallDFFontLimit; |
| dfMaskScaleCeil = kMediumDFFontLimit; |
| *textRatio = textSize / kMediumDFFontSize; |
| skPaint->setTextSize(SkIntToScalar(kMediumDFFontSize)); |
| } else { |
| dfMaskScaleFloor = kMediumDFFontLimit; |
| dfMaskScaleCeil = kLargeDFFontLimit; |
| *textRatio = textSize / kLargeDFFontSize; |
| skPaint->setTextSize(SkIntToScalar(kLargeDFFontSize)); |
| } |
| |
| // Because there can be multiple runs in the blob, we want the overall maxMinScale, and |
| // minMaxScale to make regeneration decisions. Specifically, we want the maximum minimum scale |
| // we can tolerate before we'd drop to a lower mip size, and the minimum maximum scale we can |
| // tolerate before we'd have to move to a large mip size. When we actually test these values |
| // we look at the delta in scale between the new viewmatrix and the old viewmatrix, and test |
| // against these values to decide if we can reuse or not(ie, will a given scale change our mip |
| // level) |
| SkASSERT(dfMaskScaleFloor <= scaledTextSize && scaledTextSize <= dfMaskScaleCeil); |
| blob->fMaxMinScale = SkMaxScalar(dfMaskScaleFloor / scaledTextSize, blob->fMaxMinScale); |
| blob->fMinMaxScale = SkMinScalar(dfMaskScaleCeil / scaledTextSize, blob->fMinMaxScale); |
| |
| skPaint->setLCDRenderText(false); |
| skPaint->setAutohinted(false); |
| skPaint->setHinting(SkPaint::kNormal_Hinting); |
| skPaint->setSubpixelText(true); |
| } |
| |
| inline void GrAtlasTextContext::fallbackDrawPosText(GrAtlasTextBlob* blob, |
| int runIndex, |
| const GrClip& clip, |
| GrColor color, |
| const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const SkTDArray<char>& fallbackTxt, |
| const SkTDArray<SkScalar>& fallbackPos, |
| int scalarsPerPosition, |
| const SkPoint& offset) { |
| SkASSERT(fallbackTxt.count()); |
| blob->setHasBitmap(); |
| Run& run = blob->fRuns[runIndex]; |
| // Push back a new subrun to fill and set the override descriptor |
| run.push_back(); |
| run.fOverrideDescriptor.reset(new SkAutoDescriptor); |
| skPaint.getScalerContextDescriptor(run.fOverrideDescriptor, |
| fSurfaceProps, &viewMatrix, false); |
| SkGlyphCache* cache = SkGlyphCache::DetachCache(run.fTypeface, |
| run.fOverrideDescriptor->getDesc()); |
| this->internalDrawBMPPosText(blob, runIndex, cache, skPaint, color, viewMatrix, |
| fallbackTxt.begin(), fallbackTxt.count(), |
| fallbackPos.begin(), scalarsPerPosition, offset); |
| SkGlyphCache::AttachCache(cache); |
| } |
| |
| inline GrAtlasTextBlob* |
| GrAtlasTextContext::setupDFBlob(int glyphCount, const SkPaint& origPaint, |
| const SkMatrix& viewMatrix, SkPaint* dfPaint, |
| SkScalar* textRatio) { |
| GrAtlasTextBlob* blob = fCache->createBlob(glyphCount, 1, GrAtlasTextBlob::kGrayTextVASize); |
| |
| *dfPaint = origPaint; |
| this->initDistanceFieldPaint(blob, dfPaint, textRatio, viewMatrix); |
| blob->fViewMatrix = viewMatrix; |
| Run& run = blob->fRuns[0]; |
| PerSubRunInfo& subRun = run.fSubRunInfo.back(); |
| subRun.setUseLCDText(origPaint.isLCDRenderText()); |
| subRun.setDrawAsDistanceFields(); |
| |
| return blob; |
| } |
| |
| inline GrAtlasTextBlob* |
| GrAtlasTextContext::createDrawTextBlob(const GrClip& clip, |
| const GrPaint& paint, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y, const SkIRect& regionClipBounds) { |
| int glyphCount = skPaint.countText(text, byteLength); |
| |
| GrAtlasTextBlob* blob; |
| if (this->canDrawAsDistanceFields(skPaint, viewMatrix)) { |
| SkPaint dfPaint; |
| SkScalar textRatio; |
| blob = this->setupDFBlob(glyphCount, skPaint, viewMatrix, &dfPaint, &textRatio); |
| |
| SkTDArray<char> fallbackTxt; |
| SkTDArray<SkScalar> fallbackPos; |
| SkPoint offset; |
| this->internalDrawDFText(blob, 0, dfPaint, paint.getColor(), viewMatrix, text, |
| byteLength, x, y, textRatio, &fallbackTxt, &fallbackPos, |
| &offset, skPaint); |
| if (fallbackTxt.count()) { |
| this->fallbackDrawPosText(blob, 0, clip, paint.getColor(), skPaint, viewMatrix, |
| fallbackTxt, fallbackPos, 2, offset); |
| } |
| } else { |
| blob = fCache->createBlob(glyphCount, 1, GrAtlasTextBlob::kGrayTextVASize); |
| blob->fViewMatrix = viewMatrix; |
| |
| SkGlyphCache* cache = this->setupCache(&blob->fRuns[0], skPaint, &viewMatrix, false); |
| this->internalDrawBMPText(blob, 0, cache, skPaint, paint.getColor(), viewMatrix, text, |
| byteLength, x, y); |
| SkGlyphCache::AttachCache(cache); |
| } |
| return blob; |
| } |
| |
| inline GrAtlasTextBlob* |
| GrAtlasTextContext::createDrawPosTextBlob(const GrClip& clip, |
| const GrPaint& paint, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset, const SkIRect& regionClipBounds) { |
| int glyphCount = skPaint.countText(text, byteLength); |
| |
| GrAtlasTextBlob* blob; |
| if (this->canDrawAsDistanceFields(skPaint, viewMatrix)) { |
| SkPaint dfPaint; |
| SkScalar textRatio; |
| blob = this->setupDFBlob(glyphCount, skPaint, viewMatrix, &dfPaint, &textRatio); |
| |
| SkTDArray<char> fallbackTxt; |
| SkTDArray<SkScalar> fallbackPos; |
| this->internalDrawDFPosText(blob, 0, dfPaint, paint.getColor(), viewMatrix, text, |
| byteLength, pos, scalarsPerPosition, offset, |
| textRatio, &fallbackTxt, &fallbackPos); |
| if (fallbackTxt.count()) { |
| this->fallbackDrawPosText(blob, 0, clip, paint.getColor(), skPaint, viewMatrix, |
| fallbackTxt, fallbackPos, scalarsPerPosition, offset); |
| } |
| } else { |
| blob = fCache->createBlob(glyphCount, 1, GrAtlasTextBlob::kGrayTextVASize); |
| blob->fViewMatrix = viewMatrix; |
| SkGlyphCache* cache = this->setupCache(&blob->fRuns[0], skPaint, &viewMatrix, false); |
| this->internalDrawBMPPosText(blob, 0, cache, skPaint, paint.getColor(), viewMatrix, text, |
| byteLength, pos, scalarsPerPosition, offset); |
| SkGlyphCache::AttachCache(cache); |
| } |
| return blob; |
| } |
| |
| void GrAtlasTextContext::onDrawText(GrDrawContext* dc, |
| const GrClip& clip, |
| const GrPaint& paint, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y, const SkIRect& regionClipBounds) { |
| SkAutoTUnref<GrAtlasTextBlob> blob( |
| this->createDrawTextBlob(clip, paint, skPaint, viewMatrix, |
| text, byteLength, x, y, regionClipBounds)); |
| blob->flushThrowaway(fContext, dc, fSurfaceProps, fDistanceAdjustTable, skPaint, paint, |
| clip, regionClipBounds); |
| } |
| |
| void GrAtlasTextContext::onDrawPosText(GrDrawContext* dc, |
| const GrClip& clip, |
| const GrPaint& paint, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset, const SkIRect& regionClipBounds) { |
| SkAutoTUnref<GrAtlasTextBlob> blob( |
| this->createDrawPosTextBlob(clip, paint, skPaint, viewMatrix, |
| text, byteLength, |
| pos, scalarsPerPosition, |
| offset, regionClipBounds)); |
| |
| blob->flushThrowaway(fContext, dc, fSurfaceProps, fDistanceAdjustTable, skPaint, paint, clip, |
| regionClipBounds); |
| } |
| |
| void GrAtlasTextContext::internalDrawBMPText(GrAtlasTextBlob* blob, int runIndex, |
| SkGlyphCache* cache, const SkPaint& skPaint, |
| GrColor color, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y) { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| fCurrStrike = nullptr; |
| |
| // Get GrFontScaler from cache |
| GrFontScaler* fontScaler = GetGrFontScaler(cache); |
| |
| SkFindAndPlaceGlyph::ProcessText( |
| skPaint.getTextEncoding(), text, byteLength, |
| {x, y}, viewMatrix, skPaint.getTextAlign(), |
| cache, |
| [&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) { |
| position += rounding; |
| this->bmpAppendGlyph( |
| blob, runIndex, glyph, |
| SkScalarFloorToInt(position.fX), SkScalarFloorToInt(position.fY), |
| color, fontScaler); |
| } |
| ); |
| } |
| |
| void GrAtlasTextContext::internalDrawBMPPosText(GrAtlasTextBlob* blob, int runIndex, |
| SkGlyphCache* cache, const SkPaint& skPaint, |
| GrColor color, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset) { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| fCurrStrike = nullptr; |
| |
| // Get GrFontScaler from cache |
| GrFontScaler* fontScaler = GetGrFontScaler(cache); |
| |
| SkFindAndPlaceGlyph::ProcessPosText( |
| skPaint.getTextEncoding(), text, byteLength, |
| offset, viewMatrix, pos, scalarsPerPosition, |
| skPaint.getTextAlign(), cache, |
| [&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) { |
| position += rounding; |
| this->bmpAppendGlyph( |
| blob, runIndex, glyph, |
| SkScalarFloorToInt(position.fX), SkScalarFloorToInt(position.fY), |
| color, fontScaler); |
| } |
| ); |
| } |
| |
| void GrAtlasTextContext::internalDrawDFText(GrAtlasTextBlob* blob, int runIndex, |
| const SkPaint& skPaint, GrColor color, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y, |
| SkScalar textRatio, |
| SkTDArray<char>* fallbackTxt, |
| SkTDArray<SkScalar>* fallbackPos, |
| SkPoint* offset, |
| const SkPaint& origPaint) { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| SkDrawCacheProc glyphCacheProc = origPaint.getDrawCacheProc(); |
| SkAutoDescriptor desc; |
| origPaint.getScalerContextDescriptor(&desc, fSurfaceProps, nullptr, true); |
| SkGlyphCache* origPaintCache = SkGlyphCache::DetachCache(origPaint.getTypeface(), |
| desc.getDesc()); |
| |
| SkTArray<SkScalar> positions; |
| |
| const char* textPtr = text; |
| SkFixed stopX = 0; |
| SkFixed stopY = 0; |
| SkFixed origin = 0; |
| switch (origPaint.getTextAlign()) { |
| case SkPaint::kRight_Align: origin = SK_Fixed1; break; |
| case SkPaint::kCenter_Align: origin = SK_FixedHalf; break; |
| case SkPaint::kLeft_Align: origin = 0; break; |
| } |
| |
| SkAutoKern autokern; |
| const char* stop = text + byteLength; |
| while (textPtr < stop) { |
| // don't need x, y here, since all subpixel variants will have the |
| // same advance |
| const SkGlyph& glyph = glyphCacheProc(origPaintCache, &textPtr, 0, 0); |
| |
| SkFixed width = glyph.fAdvanceX + autokern.adjust(glyph); |
| positions.push_back(SkFixedToScalar(stopX + SkFixedMul(origin, width))); |
| |
| SkFixed height = glyph.fAdvanceY; |
| positions.push_back(SkFixedToScalar(stopY + SkFixedMul(origin, height))); |
| |
| stopX += width; |
| stopY += height; |
| } |
| SkASSERT(textPtr == stop); |
| |
| SkGlyphCache::AttachCache(origPaintCache); |
| |
| // now adjust starting point depending on alignment |
| SkScalar alignX = SkFixedToScalar(stopX); |
| SkScalar alignY = SkFixedToScalar(stopY); |
| if (origPaint.getTextAlign() == SkPaint::kCenter_Align) { |
| alignX = SkScalarHalf(alignX); |
| alignY = SkScalarHalf(alignY); |
| } else if (origPaint.getTextAlign() == SkPaint::kLeft_Align) { |
| alignX = 0; |
| alignY = 0; |
| } |
| x -= alignX; |
| y -= alignY; |
| *offset = SkPoint::Make(x, y); |
| |
| this->internalDrawDFPosText(blob, runIndex, skPaint, color, viewMatrix, text, byteLength, |
| positions.begin(), 2, *offset, textRatio, fallbackTxt, |
| fallbackPos); |
| } |
| |
| void GrAtlasTextContext::internalDrawDFPosText(GrAtlasTextBlob* blob, int runIndex, |
| const SkPaint& skPaint, GrColor color, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset, |
| SkScalar textRatio, |
| SkTDArray<char>* fallbackTxt, |
| SkTDArray<SkScalar>* fallbackPos) { |
| |
| SkASSERT(byteLength == 0 || text != nullptr); |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| fCurrStrike = nullptr; |
| |
| SkDrawCacheProc glyphCacheProc = skPaint.getDrawCacheProc(); |
| SkGlyphCache* cache = this->setupCache(&blob->fRuns[runIndex], skPaint, nullptr, true); |
| GrFontScaler* fontScaler = GetGrFontScaler(cache); |
| |
| const char* stop = text + byteLength; |
| |
| if (SkPaint::kLeft_Align == skPaint.getTextAlign()) { |
| while (text < stop) { |
| const char* lastText = text; |
| // the last 2 parameters are ignored |
| const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0); |
| |
| if (glyph.fWidth) { |
| SkScalar x = offset.x() + pos[0]; |
| SkScalar y = offset.y() + (2 == scalarsPerPosition ? pos[1] : 0); |
| |
| if (!this->dfAppendGlyph(blob, |
| runIndex, |
| glyph, |
| x, y, color, fontScaler, |
| textRatio, viewMatrix)) { |
| // couldn't append, send to fallback |
| fallbackTxt->append(SkToInt(text-lastText), lastText); |
| *fallbackPos->append() = pos[0]; |
| if (2 == scalarsPerPosition) { |
| *fallbackPos->append() = pos[1]; |
| } |
| } |
| } |
| pos += scalarsPerPosition; |
| } |
| } else { |
| SkScalar alignMul = SkPaint::kCenter_Align == skPaint.getTextAlign() ? SK_ScalarHalf |
| : SK_Scalar1; |
| while (text < stop) { |
| const char* lastText = text; |
| // the last 2 parameters are ignored |
| const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0); |
| |
| if (glyph.fWidth) { |
| SkScalar x = offset.x() + pos[0]; |
| SkScalar y = offset.y() + (2 == scalarsPerPosition ? pos[1] : 0); |
| |
| SkScalar advanceX = SkFixedToScalar(glyph.fAdvanceX) * alignMul * textRatio; |
| SkScalar advanceY = SkFixedToScalar(glyph.fAdvanceY) * alignMul * textRatio; |
| |
| if (!this->dfAppendGlyph(blob, |
| runIndex, |
| glyph, |
| x - advanceX, y - advanceY, color, |
| fontScaler, |
| textRatio, |
| viewMatrix)) { |
| // couldn't append, send to fallback |
| fallbackTxt->append(SkToInt(text-lastText), lastText); |
| *fallbackPos->append() = pos[0]; |
| if (2 == scalarsPerPosition) { |
| *fallbackPos->append() = pos[1]; |
| } |
| } |
| } |
| pos += scalarsPerPosition; |
| } |
| } |
| |
| SkGlyphCache::AttachCache(cache); |
| } |
| |
| void GrAtlasTextContext::bmpAppendGlyph(GrAtlasTextBlob* blob, int runIndex, |
| const SkGlyph& skGlyph, |
| int vx, int vy, GrColor color, GrFontScaler* scaler) { |
| if (!fCurrStrike) { |
| fCurrStrike = fContext->getBatchFontCache()->getStrike(scaler); |
| } |
| |
| GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(), |
| skGlyph.getSubXFixed(), |
| skGlyph.getSubYFixed(), |
| GrGlyph::kCoverage_MaskStyle); |
| GrGlyph* glyph = fCurrStrike->getGlyph(skGlyph, id, scaler); |
| if (!glyph) { |
| return; |
| } |
| |
| int x = vx + glyph->fBounds.fLeft; |
| int y = vy + glyph->fBounds.fTop; |
| |
| // keep them as ints until we've done the clip-test |
| int width = glyph->fBounds.width(); |
| int height = glyph->fBounds.height(); |
| |
| SkRect r; |
| r.fLeft = SkIntToScalar(x); |
| r.fTop = SkIntToScalar(y); |
| r.fRight = r.fLeft + SkIntToScalar(width); |
| r.fBottom = r.fTop + SkIntToScalar(height); |
| |
| blob->appendGlyph(runIndex, r, color, fCurrStrike, glyph, scaler, skGlyph, |
| SkIntToScalar(vx), SkIntToScalar(vy), 1.0f, false); |
| } |
| |
| bool GrAtlasTextContext::dfAppendGlyph(GrAtlasTextBlob* blob, int runIndex, |
| const SkGlyph& skGlyph, |
| SkScalar sx, SkScalar sy, GrColor color, |
| GrFontScaler* scaler, |
| SkScalar textRatio, const SkMatrix& viewMatrix) { |
| if (!fCurrStrike) { |
| fCurrStrike = fContext->getBatchFontCache()->getStrike(scaler); |
| } |
| |
| GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(), |
| skGlyph.getSubXFixed(), |
| skGlyph.getSubYFixed(), |
| GrGlyph::kDistance_MaskStyle); |
| GrGlyph* glyph = fCurrStrike->getGlyph(skGlyph, id, scaler); |
| if (!glyph) { |
| return true; |
| } |
| |
| // fallback to color glyph support |
| if (kA8_GrMaskFormat != glyph->fMaskFormat) { |
| return false; |
| } |
| |
| SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft + SK_DistanceFieldInset); |
| SkScalar dy = SkIntToScalar(glyph->fBounds.fTop + SK_DistanceFieldInset); |
| SkScalar width = SkIntToScalar(glyph->fBounds.width() - 2 * SK_DistanceFieldInset); |
| SkScalar height = SkIntToScalar(glyph->fBounds.height() - 2 * SK_DistanceFieldInset); |
| |
| SkScalar scale = textRatio; |
| dx *= scale; |
| dy *= scale; |
| width *= scale; |
| height *= scale; |
| sx += dx; |
| sy += dy; |
| SkRect glyphRect = SkRect::MakeXYWH(sx, sy, width, height); |
| |
| blob->appendGlyph(runIndex, glyphRect, color, fCurrStrike, glyph, scaler, skGlyph, |
| sx - dx, sy - dy, scale, true); |
| return true; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #ifdef GR_TEST_UTILS |
| |
| DRAW_BATCH_TEST_DEFINE(TextBlobBatch) { |
| static uint32_t gContextID = SK_InvalidGenID; |
| static GrAtlasTextContext* gTextContext = nullptr; |
| static SkSurfaceProps gSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType); |
| |
| if (context->uniqueID() != gContextID) { |
| gContextID = context->uniqueID(); |
| delete gTextContext; |
| |
| // We don't yet test the fall back to paths in the GrTextContext base class. This is mostly |
| // because we don't really want to have a gpu device here. |
| // We enable distance fields by twiddling a knob on the paint |
| gTextContext = GrAtlasTextContext::Create(context, gSurfaceProps); |
| } |
| |
| // Setup dummy SkPaint / GrPaint |
| GrColor color = GrRandomColor(random); |
| SkMatrix viewMatrix = GrTest::TestMatrixInvertible(random); |
| SkPaint skPaint; |
| skPaint.setColor(color); |
| skPaint.setLCDRenderText(random->nextBool()); |
| skPaint.setAntiAlias(skPaint.isLCDRenderText() ? true : random->nextBool()); |
| skPaint.setSubpixelText(random->nextBool()); |
| |
| GrPaint grPaint; |
| if (!SkPaintToGrPaint(context, skPaint, viewMatrix, &grPaint)) { |
| SkFAIL("couldn't convert paint\n"); |
| } |
| |
| const char* text = "The quick brown fox jumps over the lazy dog."; |
| int textLen = (int)strlen(text); |
| |
| // Setup clip |
| GrClip clip; |
| SkIRect noClip = SkIRect::MakeLargest(); |
| |
| // right now we don't handle textblobs, nor do we handle drawPosText. Since we only |
| // intend to test the batch with this unit test, that is okay. |
| SkAutoTUnref<GrAtlasTextBlob> blob( |
| gTextContext->createDrawTextBlob(clip, grPaint, skPaint, viewMatrix, text, |
| static_cast<size_t>(textLen), 0, 0, noClip)); |
| |
| SkScalar transX = static_cast<SkScalar>(random->nextU()); |
| SkScalar transY = static_cast<SkScalar>(random->nextU()); |
| const GrAtlasTextBlob::Run::SubRunInfo& info = blob->fRuns[0].fSubRunInfo[0]; |
| return blob->createBatch(info, textLen, 0, 0, color, transX, transY, skPaint, |
| gSurfaceProps, gTextContext->dfAdjustTable(), |
| context->getBatchFontCache()); |
| } |
| |
| #endif |