| /* |
| * 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 "GrTextContext.h" |
| |
| #include "GrCaps.h" |
| #include "GrContext.h" |
| #include "GrContextPriv.h" |
| #include "GrSDFMaskFilter.h" |
| #include "GrTextBlobCache.h" |
| #include "SkDistanceFieldGen.h" |
| #include "SkDraw.h" |
| #include "SkDrawFilter.h" |
| #include "SkDrawProcs.h" |
| #include "SkFindAndPlaceGlyph.h" |
| #include "SkGlyphRun.h" |
| #include "SkGr.h" |
| #include "SkGraphics.h" |
| #include "SkMakeUnique.h" |
| #include "SkMaskFilterBase.h" |
| #include "SkPaintPriv.h" |
| #include "SkTextMapStateProc.h" |
| #include "SkTo.h" |
| #include "ops/GrMeshDrawOp.h" |
| |
| // DF sizes and thresholds for usage of the small and medium sizes. For example, above |
| // kSmallDFFontLimit we will use the medium size. The large size is used up until the size at |
| // which we switch over to drawing as paths as controlled by Options. |
| 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; |
| |
| static const int kDefaultMinDistanceFieldFontSize = 18; |
| #ifdef SK_BUILD_FOR_ANDROID |
| static const int kDefaultMaxDistanceFieldFontSize = 384; |
| #else |
| static const int kDefaultMaxDistanceFieldFontSize = 2 * kLargeDFFontSize; |
| #endif |
| |
| GrTextContext::GrTextContext(const Options& options) |
| : fDistanceAdjustTable(new GrDistanceFieldAdjustTable), fOptions(options) { |
| SanitizeOptions(&fOptions); |
| } |
| |
| std::unique_ptr<GrTextContext> GrTextContext::Make(const Options& options) { |
| return std::unique_ptr<GrTextContext>(new GrTextContext(options)); |
| } |
| |
| SkColor GrTextContext::ComputeCanonicalColor(const SkPaint& paint, bool lcd) { |
| SkColor 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; |
| } |
| |
| SkScalerContextFlags GrTextContext::ComputeScalerContextFlags( |
| const GrColorSpaceInfo& colorSpaceInfo) { |
| // If we're doing gamma-correct rendering, then we can disable the gamma hacks. |
| // Otherwise, leave them on. In either case, we still want the contrast boost: |
| if (colorSpaceInfo.isGammaCorrect()) { |
| return SkScalerContextFlags::kBoostContrast; |
| } else { |
| return SkScalerContextFlags::kFakeGammaAndBoostContrast; |
| } |
| } |
| |
| // 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 GrTextContext::HasLCD(const SkTextBlob* blob) { |
| SkTextBlobRunIterator it(blob); |
| for (; !it.done(); it.next()) { |
| if (it.isLCD()) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void GrTextContext::drawTextBlob(GrContext* context, GrTextUtils::Target* target, |
| const GrClip& clip, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, const SkSurfaceProps& props, |
| const SkTextBlob* blob, SkScalar x, SkScalar y, |
| SkDrawFilter* drawFilter, const SkIRect& clipBounds) { |
| // If we have been abandoned, then don't draw |
| if (context->contextPriv().abandoned()) { |
| return; |
| } |
| |
| sk_sp<GrTextBlob> cacheBlob; |
| SkMaskFilterBase::BlurRec blurRec; |
| GrTextBlob::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 && !as_MFB(mf)->asABlur(&blurRec)) || |
| drawFilter); |
| SkScalerContextFlags scalerContextFlags = ComputeScalerContextFlags(target->colorSpaceInfo()); |
| |
| auto glyphCache = context->contextPriv().getGlyphCache(); |
| GrTextBlobCache* textBlobCache = context->contextPriv().getTextBlobCache(); |
| |
| if (canCache) { |
| bool hasLCD = HasLCD(blob); |
| |
| // We canonicalize all non-lcd draws to use kUnknown_SkPixelGeometry |
| SkPixelGeometry pixelGeometry = hasLCD ? props.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; |
| key.fScalerContextFlags = scalerContextFlags; |
| cacheBlob = textBlobCache->find(key); |
| } |
| |
| GrTextUtils::Paint paint(&skPaint, &target->colorSpaceInfo()); |
| if (cacheBlob) { |
| if (cacheBlob->mustRegenerate(paint, 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 |
| textBlobCache->remove(cacheBlob.get()); |
| cacheBlob = textBlobCache->makeCachedBlob(blob, key, blurRec, skPaint); |
| this->regenerateTextBlob(cacheBlob.get(), glyphCache, |
| *context->contextPriv().caps()->shaderCaps(), paint, |
| scalerContextFlags, viewMatrix, props, blob, x, y, drawFilter); |
| } else { |
| textBlobCache->makeMRU(cacheBlob.get()); |
| |
| if (CACHE_SANITY_CHECK) { |
| int glyphCount = 0; |
| int runCount = 0; |
| GrTextBlobCache::BlobGlyphCount(&glyphCount, &runCount, blob); |
| sk_sp<GrTextBlob> sanityBlob(textBlobCache->makeBlob(glyphCount, runCount)); |
| sanityBlob->setupKey(key, blurRec, skPaint); |
| this->regenerateTextBlob( |
| sanityBlob.get(), glyphCache, *context->contextPriv().caps()->shaderCaps(), |
| paint, scalerContextFlags, viewMatrix, props, blob, x, y, drawFilter); |
| GrTextBlob::AssertEqual(*sanityBlob, *cacheBlob); |
| } |
| } |
| } else { |
| if (canCache) { |
| cacheBlob = textBlobCache->makeCachedBlob(blob, key, blurRec, skPaint); |
| } else { |
| cacheBlob = textBlobCache->makeBlob(blob); |
| } |
| this->regenerateTextBlob(cacheBlob.get(), glyphCache, |
| *context->contextPriv().caps()->shaderCaps(), paint, |
| scalerContextFlags, viewMatrix, props, blob, x, y, drawFilter); |
| } |
| |
| cacheBlob->flush(target, props, fDistanceAdjustTable.get(), paint, |
| clip, viewMatrix, clipBounds, x, y); |
| } |
| |
| void GrTextContext::regenerateTextBlob(GrTextBlob* cacheBlob, |
| GrGlyphCache* glyphCache, |
| const GrShaderCaps& shaderCaps, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, const SkTextBlob* blob, |
| SkScalar x, SkScalar y, |
| SkDrawFilter* drawFilter) const { |
| cacheBlob->initReusableBlob(paint.luminanceColor(), viewMatrix, x, y); |
| |
| // Regenerate textblob |
| SkTextBlobRunIterator it(blob); |
| GrTextUtils::RunPaint runPaint(&paint, drawFilter); |
| 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(); |
| cacheBlob->push_back_run(run); |
| if (!runPaint.modifyForRun([it](SkPaint* p) { it.applyFontToPaint(p); })) { |
| continue; |
| } |
| cacheBlob->setRunPaintFlags(run, runPaint.skPaint().getFlags()); |
| |
| if (CanDrawAsDistanceFields(runPaint, viewMatrix, props, |
| shaderCaps.supportsDistanceFieldText(), fOptions)) { |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: { |
| auto origin = SkPoint::Make(x + offset.x(), y + offset.y()); |
| SkGlyphRunBuilder builder; |
| builder.prepareDrawText(runPaint.skPaint(), |
| (const char*)it.glyphs(), textLen, origin); |
| |
| auto glyphRun = builder.useGlyphRun(); |
| |
| glyphRun->temporaryShuntToCallback( |
| [&](size_t runSize, const char* glyphIDs, const SkScalar* pos) { |
| this->drawDFPosText( |
| cacheBlob, run, glyphCache, props, runPaint, scalerContextFlags, |
| viewMatrix, glyphIDs, 2 * runSize, pos, 2, |
| SkPoint::Make(0,0)); |
| }); |
| break; |
| } |
| |
| case SkTextBlob::kHorizontal_Positioning: { |
| SkPoint dfOffset = SkPoint::Make(x, y + offset.y()); |
| this->drawDFPosText(cacheBlob, run, glyphCache, props, runPaint, |
| scalerContextFlags, viewMatrix, (const char*)it.glyphs(), |
| textLen, it.pos(), 1, dfOffset); |
| break; |
| } |
| case SkTextBlob::kFull_Positioning: { |
| SkPoint dfOffset = SkPoint::Make(x, y); |
| this->drawDFPosText(cacheBlob, run, glyphCache, props, runPaint, |
| scalerContextFlags, viewMatrix, (const char*)it.glyphs(), |
| textLen, it.pos(), 2, dfOffset); |
| break; |
| } |
| } |
| } else { |
| switch (it.positioning()) { |
| case SkTextBlob::kDefault_Positioning: { |
| auto origin = SkPoint::Make(x + offset.x(), y + offset.y()); |
| SkGlyphRunBuilder builder; |
| builder.prepareDrawText(runPaint.skPaint(), |
| (const char*)it.glyphs(), textLen, origin); |
| |
| auto glyphRun = builder.useGlyphRun(); |
| |
| glyphRun->temporaryShuntToCallback( |
| [&](size_t runSize, const char* glyphIDs, const SkScalar* pos) { |
| this->DrawBmpPosText( |
| cacheBlob, run, glyphCache, props, runPaint, scalerContextFlags, |
| viewMatrix, glyphIDs, 2 * runSize, |
| pos, 2, SkPoint::Make(0, 0)); |
| }); |
| break; |
| } |
| case SkTextBlob::kHorizontal_Positioning: |
| DrawBmpPosText(cacheBlob, run, glyphCache, props, runPaint, scalerContextFlags, |
| viewMatrix, (const char*)it.glyphs(), textLen, it.pos(), 1, |
| SkPoint::Make(x, y + offset.y())); |
| break; |
| case SkTextBlob::kFull_Positioning: |
| DrawBmpPosText(cacheBlob, run, glyphCache, props, runPaint, scalerContextFlags, |
| viewMatrix, (const char*)it.glyphs(), textLen, it.pos(), 2, |
| SkPoint::Make(x, y)); |
| break; |
| } |
| } |
| } |
| } |
| |
| inline sk_sp<GrTextBlob> |
| GrTextContext::makeDrawPosTextBlob(GrTextBlobCache* blobCache, |
| GrGlyphCache* glyphCache, |
| const GrShaderCaps& shaderCaps, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, const |
| SkPoint& offset) const { |
| int glyphCount = paint.skPaint().countText(text, byteLength); |
| if (!glyphCount) { |
| return nullptr; |
| } |
| |
| sk_sp<GrTextBlob> blob = blobCache->makeBlob(glyphCount, 1); |
| blob->initThrowawayBlob(viewMatrix, offset.x(), offset.y()); |
| blob->setRunPaintFlags(0, paint.skPaint().getFlags()); |
| |
| if (CanDrawAsDistanceFields(paint, viewMatrix, props, shaderCaps.supportsDistanceFieldText(), |
| fOptions)) { |
| this->drawDFPosText(blob.get(), 0, glyphCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, pos, scalarsPerPosition, offset); |
| } else { |
| DrawBmpPosText(blob.get(), 0, glyphCache, props, paint, scalerContextFlags, viewMatrix, |
| text, byteLength, pos, scalarsPerPosition, offset); |
| } |
| return blob; |
| } |
| |
| void GrTextContext::drawPosText(GrContext* context, GrTextUtils::Target* target, |
| const GrClip& clip, const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, const SkSurfaceProps& props, |
| const char text[], size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset, |
| const SkIRect& regionClipBounds) { |
| GrTextUtils::Paint paint(&skPaint, &target->colorSpaceInfo()); |
| if (context->contextPriv().abandoned()) { |
| return; |
| } |
| |
| auto glyphCache = context->contextPriv().getGlyphCache(); |
| auto textBlobCache = context->contextPriv().getTextBlobCache(); |
| |
| sk_sp<GrTextBlob> blob(this->makeDrawPosTextBlob( |
| textBlobCache, glyphCache, *context->contextPriv().caps()->shaderCaps(), paint, |
| ComputeScalerContextFlags(target->colorSpaceInfo()), viewMatrix, props, text, |
| byteLength, pos, scalarsPerPosition, offset)); |
| if (blob) { |
| blob->flush(target, props, fDistanceAdjustTable.get(), paint, |
| clip, viewMatrix, regionClipBounds, offset.fX, offset.fY); |
| } |
| } |
| |
| |
| void GrTextContext::DrawBmpPosText(GrTextBlob* blob, int runIndex, |
| GrGlyphCache* glyphCache, const SkSurfaceProps& props, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| 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; |
| } |
| |
| // Ensure the blob is set for bitmaptext |
| blob->setHasBitmap(); |
| |
| if (SkDraw::ShouldDrawTextAsPaths(paint, viewMatrix)) { |
| DrawBmpPosTextAsPaths(blob, runIndex, glyphCache, props, paint, scalerContextFlags, |
| viewMatrix, text, byteLength, pos, scalarsPerPosition, offset); |
| return; |
| } |
| |
| sk_sp<GrTextStrike> currStrike; |
| auto cache = blob->setupCache(runIndex, props, scalerContextFlags, paint, &viewMatrix); |
| SkFindAndPlaceGlyph::ProcessPosText( |
| paint.skPaint().getTextEncoding(), text, byteLength, offset, viewMatrix, pos, |
| scalarsPerPosition, cache.get(), |
| [&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) { |
| position += rounding; |
| BmpAppendGlyph(blob, runIndex, glyphCache, &currStrike, glyph, |
| SkScalarFloorToScalar(position.fX), |
| SkScalarFloorToScalar(position.fY), |
| paint.filteredPremulColor(), cache.get(), SK_Scalar1, false); |
| }); |
| } |
| |
| void GrTextContext::DrawBmpPosTextAsPaths(GrTextBlob* blob, int runIndex, |
| GrGlyphCache* glyphCache, |
| const SkSurfaceProps& props, |
| const GrTextUtils::Paint& origPaint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset) { |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| // setup our std paint, in hopes of getting hits in the cache |
| SkPaint pathPaint(origPaint); |
| SkScalar matrixScale = pathPaint.setupForAsPaths(); |
| FallbackTextHelper fallbackTextHelper(viewMatrix, origPaint, glyphCache->getGlyphSizeLimit(), |
| matrixScale); |
| |
| // Temporarily jam in kFill, so we only ever ask for the raw outline from the cache. |
| pathPaint.setStyle(SkPaint::kFill_Style); |
| pathPaint.setPathEffect(nullptr); |
| |
| SkPaint::GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(pathPaint.getTextEncoding(), |
| true); |
| auto cache = SkStrikeCache::FindOrCreateStrikeExclusive( |
| pathPaint, &props, SkScalerContextFlags::kFakeGammaAndBoostContrast, nullptr); |
| |
| const char* stop = text + byteLength; |
| const char* lastText = text; |
| SkTextMapStateProc tmsProc(SkMatrix::I(), offset, scalarsPerPosition); |
| |
| while (text < stop) { |
| const SkGlyph& glyph = glyphCacheProc(cache.get(), &text); |
| if (glyph.fWidth) { |
| SkPoint loc; |
| tmsProc(pos, &loc); |
| if (SkMask::kARGB32_Format == glyph.fMaskFormat) { |
| fallbackTextHelper.appendText(glyph, text - lastText, lastText, loc); |
| } else { |
| const SkPath* path = cache->findPath(glyph); |
| if (path) { |
| blob->appendPathGlyph(runIndex, *path, loc.fX, loc.fY, matrixScale, false); |
| } |
| } |
| } |
| lastText = text; |
| pos += scalarsPerPosition; |
| } |
| |
| fallbackTextHelper.drawText(blob, runIndex, glyphCache, props, origPaint, scalerContextFlags); |
| } |
| |
| void GrTextContext::BmpAppendGlyph(GrTextBlob* blob, int runIndex, |
| GrGlyphCache* grGlyphCache, |
| sk_sp<GrTextStrike>* strike, |
| const SkGlyph& skGlyph, SkScalar sx, SkScalar sy, |
| GrColor color, SkGlyphCache* skGlyphCache, |
| SkScalar textRatio, bool needsTransform) { |
| if (!*strike) { |
| *strike = grGlyphCache->getStrike(skGlyphCache); |
| } |
| |
| GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(), |
| skGlyph.getSubXFixed(), |
| skGlyph.getSubYFixed(), |
| GrGlyph::kCoverage_MaskStyle); |
| GrGlyph* glyph = (*strike)->getGlyph(skGlyph, id, skGlyphCache); |
| if (!glyph) { |
| return; |
| } |
| |
| SkASSERT(skGlyph.fWidth == glyph->width()); |
| SkASSERT(skGlyph.fHeight == glyph->height()); |
| |
| SkScalar dx = SkIntToScalar(glyph->fBounds.fLeft); |
| SkScalar dy = SkIntToScalar(glyph->fBounds.fTop); |
| SkScalar width = SkIntToScalar(glyph->fBounds.width()); |
| SkScalar height = SkIntToScalar(glyph->fBounds.height()); |
| |
| dx *= textRatio; |
| dy *= textRatio; |
| width *= textRatio; |
| height *= textRatio; |
| |
| SkRect glyphRect = SkRect::MakeXYWH(sx + dx, sy + dy, width, height); |
| |
| blob->appendGlyph(runIndex, glyphRect, color, *strike, glyph, skGlyphCache, skGlyph, sx, sy, |
| textRatio, !needsTransform); |
| } |
| |
| void GrTextContext::SanitizeOptions(Options* options) { |
| if (options->fMaxDistanceFieldFontSize < 0.f) { |
| options->fMaxDistanceFieldFontSize = kDefaultMaxDistanceFieldFontSize; |
| } |
| if (options->fMinDistanceFieldFontSize < 0.f) { |
| options->fMinDistanceFieldFontSize = kDefaultMinDistanceFieldFontSize; |
| } |
| } |
| |
| bool GrTextContext::CanDrawAsDistanceFields(const SkPaint& skPaint, const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, |
| bool contextSupportsDistanceFieldText, |
| const Options& options) { |
| if (!viewMatrix.hasPerspective()) { |
| 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 < options.fMinDistanceFieldFontSize || |
| scaledTextSize > options.fMaxDistanceFieldFontSize) { |
| return false; |
| } |
| |
| bool useDFT = props.isUseDeviceIndependentFonts(); |
| #if SK_FORCE_DISTANCE_FIELD_TEXT |
| useDFT = true; |
| #endif |
| |
| if (!useDFT && scaledTextSize < kLargeDFFontSize) { |
| return false; |
| } |
| } |
| |
| // mask filters modify alpha, which doesn't translate well to distance |
| if (skPaint.getMaskFilter() || !contextSupportsDistanceFieldText) { |
| return false; |
| } |
| |
| // TODO: add some stroking support |
| if (skPaint.getStyle() != SkPaint::kFill_Style) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void GrTextContext::InitDistanceFieldPaint(GrTextBlob* blob, |
| SkPaint* skPaint, |
| const SkMatrix& viewMatrix, |
| const Options& options, |
| SkScalar* textRatio, |
| SkScalerContextFlags* flags) { |
| SkScalar textSize = skPaint->getTextSize(); |
| SkScalar scaledTextSize = textSize; |
| |
| if (viewMatrix.hasPerspective()) { |
| // for perspective, we simply force to the medium size |
| // TODO: compute a size based on approximate screen area |
| scaledTextSize = kMediumDFFontLimit; |
| } else { |
| SkScalar maxScale = viewMatrix.getMaxScale(); |
| // 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 = options.fMinDistanceFieldFontSize; |
| 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 = options.fMaxDistanceFieldFontSize; |
| *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); |
| if (blob) { |
| blob->setMinAndMaxScale(dfMaskScaleFloor / scaledTextSize, |
| dfMaskScaleCeil / scaledTextSize); |
| } |
| |
| skPaint->setAntiAlias(true); |
| skPaint->setLCDRenderText(false); |
| skPaint->setAutohinted(false); |
| skPaint->setHinting(SkPaint::kNormal_Hinting); |
| skPaint->setSubpixelText(true); |
| |
| skPaint->setMaskFilter(GrSDFMaskFilter::Make()); |
| |
| // We apply the fake-gamma by altering the distance in the shader, so we ignore the |
| // passed-in scaler context flags. (It's only used when we fall-back to bitmap text). |
| *flags = SkScalerContextFlags::kNone; |
| } |
| |
| void GrTextContext::drawDFPosText(GrTextBlob* blob, int runIndex, |
| GrGlyphCache* glyphCache, const SkSurfaceProps& props, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags, |
| const SkMatrix& viewMatrix, const char text[], |
| size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset) const { |
| SkASSERT(byteLength == 0 || text != nullptr); |
| SkASSERT(1 == scalarsPerPosition || 2 == scalarsPerPosition); |
| |
| // nothing to draw |
| if (text == nullptr || byteLength == 0) { |
| return; |
| } |
| |
| bool hasWCoord = viewMatrix.hasPerspective() || fOptions.fDistanceFieldVerticesAlwaysHaveW; |
| |
| // Setup distance field paint and text ratio |
| SkScalar textRatio; |
| SkPaint dfPaint(paint); |
| SkScalerContextFlags flags; |
| InitDistanceFieldPaint(blob, &dfPaint, viewMatrix, fOptions, &textRatio, &flags); |
| blob->setHasDistanceField(); |
| blob->setSubRunHasDistanceFields(runIndex, paint.skPaint().isLCDRenderText(), |
| paint.skPaint().isAntiAlias(), hasWCoord); |
| |
| FallbackTextHelper fallbackTextHelper(viewMatrix, paint, glyphCache->getGlyphSizeLimit(), |
| textRatio); |
| |
| sk_sp<GrTextStrike> currStrike; |
| |
| { |
| auto cache = blob->setupCache(runIndex, props, flags, dfPaint, nullptr); |
| SkPaint::GlyphCacheProc glyphCacheProc = |
| SkPaint::GetGlyphCacheProc(dfPaint.getTextEncoding(), true); |
| |
| const char* stop = text + byteLength; |
| |
| while (text < stop) { |
| const char* lastText = text; |
| // the last 2 parameters are ignored |
| const SkGlyph& glyph = glyphCacheProc(cache.get(), &text); |
| |
| if (glyph.fWidth) { |
| SkPoint glyphPos(offset); |
| glyphPos.fX += pos[0]; |
| glyphPos.fY += (2 == scalarsPerPosition ? pos[1] : 0); |
| |
| if (glyph.fMaskFormat == SkMask::kSDF_Format) { |
| DfAppendGlyph(blob, runIndex, glyphCache, &currStrike, glyph, glyphPos.fX, |
| glyphPos.fY, paint.filteredPremulColor(), cache.get(), textRatio); |
| } else { |
| // can't append non-SDF glyph to SDF batch, send to fallback |
| fallbackTextHelper.appendText(glyph, SkToInt(text - lastText), lastText, |
| glyphPos); |
| } |
| } |
| pos += scalarsPerPosition; |
| } |
| } |
| |
| fallbackTextHelper.drawText(blob, runIndex, glyphCache, props, paint, scalerContextFlags); |
| } |
| |
| // TODO: merge with BmpAppendGlyph |
| void GrTextContext::DfAppendGlyph(GrTextBlob* blob, int runIndex, |
| GrGlyphCache* grGlyphCache, sk_sp<GrTextStrike>* strike, |
| const SkGlyph& skGlyph, SkScalar sx, SkScalar sy, |
| GrColor color, SkGlyphCache* skGlyphCache, |
| SkScalar textRatio) { |
| if (!*strike) { |
| *strike = grGlyphCache->getStrike(skGlyphCache); |
| } |
| |
| GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(), |
| skGlyph.getSubXFixed(), |
| skGlyph.getSubYFixed(), |
| GrGlyph::kDistance_MaskStyle); |
| GrGlyph* glyph = (*strike)->getGlyph(skGlyph, id, skGlyphCache); |
| if (!glyph) { |
| return; |
| } |
| |
| 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); |
| |
| dx *= textRatio; |
| dy *= textRatio; |
| width *= textRatio; |
| height *= textRatio; |
| SkRect glyphRect = SkRect::MakeXYWH(sx + dx, sy + dy, width, height); |
| |
| blob->appendGlyph(runIndex, glyphRect, color, *strike, glyph, skGlyphCache, skGlyph, sx, sy, |
| textRatio, false); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| void GrTextContext::FallbackTextHelper::appendText(const SkGlyph& glyph, int count, |
| const char* text, SkPoint glyphPos) { |
| SkScalar maxDim = SkTMax(glyph.fWidth, glyph.fHeight)*fTextRatio; |
| if (SkScalarNearlyZero(maxDim)) return; |
| |
| if (!fUseTransformedFallback) { |
| if (!fViewMatrix.isScaleTranslate() || maxDim*fMaxScale > fMaxTextSize) { |
| fUseTransformedFallback = true; |
| fMaxTextSize -= 2; // Subtract 2 to account for the bilerp pad around the glyph |
| } |
| } |
| |
| fFallbackTxt.append(count, text); |
| if (fUseTransformedFallback) { |
| // If there's a glyph in the font that's particularly large, it's possible |
| // that fScaledFallbackTextSize may end up minimizing too much. We'd rather skip |
| // that glyph than make the others blurry, so we set a minimum size of half the |
| // maximum text size to avoid this case. |
| SkScalar glyphTextSize = SkTMax(SkScalarFloorToScalar(fTextSize * fMaxTextSize/maxDim), |
| 0.5f*fMaxTextSize); |
| fTransformedFallbackTextSize = SkTMin(glyphTextSize, fTransformedFallbackTextSize); |
| } |
| *fFallbackPos.append() = glyphPos; |
| } |
| |
| void GrTextContext::FallbackTextHelper::drawText(GrTextBlob* blob, int runIndex, |
| GrGlyphCache* glyphCache, |
| const SkSurfaceProps& props, |
| const GrTextUtils::Paint& paint, |
| SkScalerContextFlags scalerContextFlags) { |
| if (fFallbackTxt.count()) { |
| blob->initOverride(runIndex); |
| blob->setHasBitmap(); |
| blob->setSubRunHasW(runIndex, fViewMatrix.hasPerspective()); |
| SkExclusiveStrikePtr cache; |
| const SkPaint& skPaint = paint.skPaint(); |
| SkPaint::GlyphCacheProc glyphCacheProc = |
| SkPaint::GetGlyphCacheProc(skPaint.getTextEncoding(), true); |
| SkColor textColor = paint.filteredPremulColor(); |
| |
| SkScalar textRatio = SK_Scalar1; |
| SkPaint fallbackPaint(skPaint); |
| SkMatrix matrix = fViewMatrix; |
| this->initializeForDraw(&fallbackPaint, &textRatio, &matrix); |
| cache = blob->setupCache(runIndex, props, scalerContextFlags, fallbackPaint, &matrix); |
| |
| sk_sp<GrTextStrike> currStrike; |
| const char* text = fFallbackTxt.begin(); |
| const char* stop = text + fFallbackTxt.count(); |
| SkPoint* glyphPos = fFallbackPos.begin(); |
| while (text < stop) { |
| const SkGlyph& glyph = glyphCacheProc(cache.get(), &text); |
| if (!fUseTransformedFallback) { |
| fViewMatrix.mapPoints(glyphPos, 1); |
| glyphPos->fX = SkScalarFloorToScalar(glyphPos->fX); |
| glyphPos->fY = SkScalarFloorToScalar(glyphPos->fY); |
| } |
| GrTextContext::BmpAppendGlyph(blob, runIndex, glyphCache, &currStrike, glyph, |
| glyphPos->fX, glyphPos->fY, textColor, |
| cache.get(), textRatio, fUseTransformedFallback); |
| glyphPos++; |
| } |
| } |
| } |
| |
| void GrTextContext::FallbackTextHelper::initializeForDraw(SkPaint* paint, SkScalar* textRatio, |
| SkMatrix* matrix) const { |
| if (!fUseTransformedFallback) return; |
| |
| paint->setTextSize(fTransformedFallbackTextSize); |
| *textRatio = fTextSize / fTransformedFallbackTextSize; |
| *matrix = SkMatrix::I(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| #if GR_TEST_UTILS |
| |
| #include "GrRenderTargetContext.h" |
| |
| std::unique_ptr<GrDrawOp> GrTextContext::createOp_TestingOnly(GrContext* context, |
| GrTextContext* textContext, |
| GrRenderTargetContext* rtc, |
| const SkPaint& skPaint, |
| const SkMatrix& viewMatrix, |
| const char* text, |
| int x, |
| int y) { |
| auto glyphCache = context->contextPriv().getGlyphCache(); |
| |
| static SkSurfaceProps surfaceProps(SkSurfaceProps::kLegacyFontHost_InitType); |
| |
| size_t textLen = (int)strlen(text); |
| |
| GrTextUtils::Paint utilsPaint(&skPaint, &rtc->colorSpaceInfo()); |
| |
| // right now we don't handle textblobs, nor do we handle drawPosText. Since we only intend to |
| // test the text op with this unit test, that is okay. |
| |
| auto origin = SkPoint::Make(x, y); |
| SkGlyphRunBuilder builder; |
| builder.prepareDrawText(skPaint, text, textLen, origin); |
| sk_sp<GrTextBlob> blob; |
| |
| auto glyphRun = builder.useGlyphRun(); |
| // Use the text and textLen below, because we don't want to mess with the paint. |
| glyphRun->temporaryShuntToCallback( |
| [&](size_t runSize, const char* glyphIDs, const SkScalar* pos) { |
| blob = textContext->makeDrawPosTextBlob( |
| context->contextPriv().getTextBlobCache(), glyphCache, |
| *context->contextPriv().caps()->shaderCaps(), utilsPaint, |
| GrTextContext::kTextBlobOpScalerContextFlags, viewMatrix, surfaceProps, text, |
| textLen, pos, 2, origin); |
| }); |
| |
| return blob->test_makeOp(textLen, 0, 0, viewMatrix, x, y, utilsPaint, surfaceProps, |
| textContext->dfAdjustTable(), rtc->textTarget()); |
| } |
| |
| GR_DRAW_OP_TEST_DEFINE(GrAtlasTextOp) { |
| static uint32_t gContextID = SK_InvalidGenID; |
| static std::unique_ptr<GrTextContext> gTextContext; |
| static SkSurfaceProps gSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType); |
| |
| if (context->uniqueID() != gContextID) { |
| gContextID = context->uniqueID(); |
| gTextContext = GrTextContext::Make(GrTextContext::Options()); |
| } |
| |
| // Setup dummy SkPaint / GrPaint / GrRenderTargetContext |
| sk_sp<GrRenderTargetContext> rtc(context->contextPriv().makeDeferredRenderTargetContext( |
| SkBackingFit::kApprox, 1024, 1024, kRGBA_8888_GrPixelConfig, nullptr)); |
| |
| SkMatrix viewMatrix = GrTest::TestMatrixInvertible(random); |
| |
| // Because we the GrTextUtils::Paint requires an SkPaint for font info, we ignore the GrPaint |
| // param. |
| SkPaint skPaint; |
| skPaint.setColor(random->nextU()); |
| skPaint.setLCDRenderText(random->nextBool()); |
| skPaint.setAntiAlias(skPaint.isLCDRenderText() ? true : random->nextBool()); |
| skPaint.setSubpixelText(random->nextBool()); |
| |
| const char* text = "The quick brown fox jumps over the lazy dog."; |
| |
| // create some random x/y offsets, including negative offsets |
| static const int kMaxTrans = 1024; |
| int xPos = (random->nextU() % 2) * 2 - 1; |
| int yPos = (random->nextU() % 2) * 2 - 1; |
| int xInt = (random->nextU() % kMaxTrans) * xPos; |
| int yInt = (random->nextU() % kMaxTrans) * yPos; |
| |
| return gTextContext->createOp_TestingOnly(context, gTextContext.get(), rtc.get(), |
| skPaint, viewMatrix, text, xInt, yInt); |
| } |
| |
| #endif |
