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|
/*
* 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 "GrBlurUtils.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
SkDEBUGCODE(static const int kExpectedDistanceAdjustTableSize = 8;)
};
GrAtlasTextContext::GrAtlasTextContext(GrContext* context, const SkSurfaceProps& surfaceProps)
: INHERITED(context, surfaceProps)
, fDistanceAdjustTable(new DistanceAdjustTable) {
// We overallocate vertices in our textblobs based on the assumption that A8 has the greatest
// vertexStride
static_assert(GrAtlasTextBatch::kGrayTextVASize >= GrAtlasTextBatch::kColorTextVASize &&
GrAtlasTextBatch::kGrayTextVASize >= GrAtlasTextBatch::kLCDTextVASize,
"vertex_attribute_changed");
fCurrStrike = nullptr;
fCache = context->getTextBlobCache();
}
void GrAtlasTextContext::DistanceAdjustTable::buildDistanceAdjustTable() {
// This is used for an approximation of the mask gamma hack, used by raster and bitmap
// text. The mask gamma hack is based off of guessing what the blend color is going to
// be, and adjusting the mask so that when run through the linear blend will
// produce the value closest to the desired result. However, in practice this means
// that the 'adjusted' mask is just increasing or decreasing the coverage of
// the mask depending on what it is thought it will blit against. For black (on
// assumed white) this means that coverages are decreased (on a curve). For white (on
// assumed black) this means that coverages are increased (on a a curve). At
// middle (perceptual) gray (which could be blit against anything) the coverages
// remain the same.
//
// The idea here is that instead of determining the initial (real) coverage and
// then adjusting that coverage, we determine an adjusted coverage directly by
// essentially manipulating the geometry (in this case, the distance to the glyph
// edge). So for black (on assumed white) this thins a bit; for white (on
// assumed black) this fake bolds the geometry a bit.
//
// The distance adjustment is calculated by determining the actual coverage value which
// when fed into in the mask gamma table gives us an 'adjusted coverage' value of 0.5. This
// actual coverage value (assuming it's between 0 and 1) corresponds to a distance from the
// actual edge. So by subtracting this distance adjustment and computing without the
// the coverage adjustment we should get 0.5 coverage at the same point.
//
// This has several implications:
// For non-gray lcd smoothed text, each subpixel essentially is using a
// slightly different geometry.
//
// For black (on assumed white) this may not cover some pixels which were
// previously covered; however those pixels would have been only slightly
// covered and that slight coverage would have been decreased anyway. Also, some pixels
// which were previously fully covered may no longer be fully covered.
//
// For white (on assumed black) this may cover some pixels which weren't
// previously covered at all.
int width, height;
size_t size;
#ifdef SK_GAMMA_CONTRAST
SkScalar contrast = SK_GAMMA_CONTRAST;
#else
SkScalar contrast = 0.5f;
#endif
SkScalar paintGamma = SK_GAMMA_EXPONENT;
SkScalar deviceGamma = SK_GAMMA_EXPONENT;
size = SkScalerContext::GetGammaLUTSize(contrast, paintGamma, deviceGamma,
&width, &height);
SkASSERT(kExpectedDistanceAdjustTableSize == height);
fTable = new SkScalar[height];
SkAutoTArray<uint8_t> data((int)size);
SkScalerContext::GetGammaLUTData(contrast, paintGamma, deviceGamma, data.get());
// find the inverse points where we cross 0.5
// binsearch might be better, but we only need to do this once on creation
for (int row = 0; row < height; ++row) {
uint8_t* rowPtr = data.get() + row*width;
for (int col = 0; col < width - 1; ++col) {
if (rowPtr[col] <= 127 && rowPtr[col + 1] >= 128) {
// compute point where a mask value will give us a result of 0.5
float interp = (127.5f - rowPtr[col]) / (rowPtr[col + 1] - rowPtr[col]);
float borderAlpha = (col + interp) / 255.f;
// compute t value for that alpha
// this is an approximate inverse for smoothstep()
float t = borderAlpha*(borderAlpha*(4.0f*borderAlpha - 6.0f) + 5.0f) / 3.0f;
// compute distance which gives us that t value
const float kDistanceFieldAAFactor = 0.65f; // should match SK_DistanceFieldAAFactor
float d = 2.0f*kDistanceFieldAAFactor*t - kDistanceFieldAAFactor;
fTable[row] = d;
break;
}
}
}
}
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;
}
bool GrAtlasTextContext::MustRegenerateBlob(SkScalar* outTransX, SkScalar* outTransY,
const GrAtlasTextBlob& blob, const SkPaint& paint,
GrColor color, const SkMaskFilter::BlurRec& blurRec,
const SkMatrix& viewMatrix, SkScalar x, SkScalar y) {
// If we have LCD text then our canonical color will be set to transparent, in this case we have
// to regenerate the blob on any color change
// We use the grPaint to get any color filter effects
if (blob.fKey.fCanonicalColor == SK_ColorTRANSPARENT &&
blob.fPaintColor != color) {
return true;
}
if (blob.fViewMatrix.hasPerspective() != viewMatrix.hasPerspective()) {
return true;
}
if (blob.fViewMatrix.hasPerspective() && !blob.fViewMatrix.cheapEqualTo(viewMatrix)) {
return true;
}
// We only cache one masked version
if (blob.fKey.fHasBlur &&
(blob.fBlurRec.fSigma != blurRec.fSigma ||
blob.fBlurRec.fStyle != blurRec.fStyle ||
blob.fBlurRec.fQuality != blurRec.fQuality)) {
return true;
}
// Similarly, we only cache one version for each style
if (blob.fKey.fStyle != SkPaint::kFill_Style &&
(blob.fStrokeInfo.fFrameWidth != paint.getStrokeWidth() ||
blob.fStrokeInfo.fMiterLimit != paint.getStrokeMiter() ||
blob.fStrokeInfo.fJoin != paint.getStrokeJoin())) {
return true;
}
// Mixed blobs must be regenerated. We could probably figure out a way to do integer scrolls
// for mixed blobs if this becomes an issue.
if (blob.hasBitmap() && blob.hasDistanceField()) {
// Identical viewmatrices and we can reuse in all cases
if (blob.fViewMatrix.cheapEqualTo(viewMatrix) && x == blob.fX && y == blob.fY) {
return false;
}
return true;
}
if (blob.hasBitmap()) {
if (blob.fViewMatrix.getScaleX() != viewMatrix.getScaleX() ||
blob.fViewMatrix.getScaleY() != viewMatrix.getScaleY() ||
blob.fViewMatrix.getSkewX() != viewMatrix.getSkewX() ||
blob.fViewMatrix.getSkewY() != viewMatrix.getSkewY()) {
return true;
}
// We can update the positions in the cachedtextblobs without regenerating the whole blob,
// but only for integer translations.
// This cool bit of math will determine the necessary translation to apply to the already
// generated vertex coordinates to move them to the correct position
SkScalar transX = viewMatrix.getTranslateX() +
viewMatrix.getScaleX() * (x - blob.fX) +
viewMatrix.getSkewX() * (y - blob.fY) -
blob.fViewMatrix.getTranslateX();
SkScalar transY = viewMatrix.getTranslateY() +
viewMatrix.getSkewY() * (x - blob.fX) +
viewMatrix.getScaleY() * (y - blob.fY) -
blob.fViewMatrix.getTranslateY();
if (!SkScalarIsInt(transX) || !SkScalarIsInt(transY) ) {
return true;
}
(*outTransX) = transX;
(*outTransY) = transY;
} else if (blob.hasDistanceField()) {
// A scale outside of [blob.fMaxMinScale, blob.fMinMaxScale] would result in a different
// distance field being generated, so we have to regenerate in those cases
SkScalar newMaxScale = viewMatrix.getMaxScale();
SkScalar oldMaxScale = blob.fViewMatrix.getMaxScale();
SkScalar scaleAdjust = newMaxScale / oldMaxScale;
if (scaleAdjust < blob.fMaxMinScale || scaleAdjust > blob.fMinMaxScale) {
return true;
}
(*outTransX) = x - blob.fX;
(*outTransY) = y - blob.fY;
}
// It is possible that a blob has neither distanceField nor bitmaptext. This is in the case
// when all of the runs inside the blob are drawn as paths. In this case, we always regenerate
// the blob anyways at flush time, so no need to regenerate explicitly
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, GrRenderTarget* rt,
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 (MustRegenerateBlob(&transX, &transY, *cacheBlob, 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,
GrAtlasTextBatch::kGrayTextVASize)));
this->regenerateTextBlob(cacheBlob, skPaint, grPaint.getColor(), viewMatrix,
blob, x, y, drawFilter, clip);
} else {
// If we can reuse the blob, then make sure we update the blob's viewmatrix, and x/y
// offsets. Note, we offset the vertex bounds right before flushing
cacheBlob->fViewMatrix = viewMatrix;
cacheBlob->fX = x;
cacheBlob->fY = y;
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,
GrAtlasTextBatch::kGrayTextVASize)));
} else {
cacheBlob.reset(fCache->createBlob(blob, GrAtlasTextBatch::kGrayTextVASize));
}
this->regenerateTextBlob(cacheBlob, skPaint, grPaint.getColor(), viewMatrix,
blob, x, y, drawFilter, clip);
}
this->flush(blob, cacheBlob, dc, rt, 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));
// setup vertex / glyphIndex for the new run
if (run > 0) {
PerSubRunInfo& newRun = cacheBlob->fRuns[run].fSubRunInfo.back();
PerSubRunInfo& lastRun = cacheBlob->fRuns[run - 1].fSubRunInfo.back();
newRun.fVertexStartIndex = lastRun.fVertexEndIndex;
newRun.fVertexEndIndex = lastRun.fVertexEndIndex;
newRun.fGlyphStartIndex = lastRun.fGlyphEndIndex;
newRun.fGlyphEndIndex = lastRun.fGlyphEndIndex;
}
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.fUseLCDText = runPaint.isLCDRenderText();
subRun.fDrawAsDistanceFields = true;
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, GrAtlasTextBatch::kGrayTextVASize);
*dfPaint = origPaint;
this->initDistanceFieldPaint(blob, dfPaint, textRatio, viewMatrix);
blob->fViewMatrix = viewMatrix;
Run& run = blob->fRuns[0];
PerSubRunInfo& subRun = run.fSubRunInfo.back();
subRun.fUseLCDText = origPaint.isLCDRenderText();
subRun.fDrawAsDistanceFields = true;
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, GrAtlasTextBatch::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, GrAtlasTextBatch::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, GrRenderTarget* rt,
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));
this->flush(blob, dc, rt, skPaint, paint, clip, regionClipBounds);
}
void GrAtlasTextContext::onDrawPosText(GrDrawContext* dc, GrRenderTarget* rt,
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));
this->flush(blob, dc, rt, 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) {
Run& run = blob->fRuns[runIndex];
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();
// If the glyph is too large we fall back to paths
if (glyph->fTooLargeForAtlas) {
this->appendGlyphPath(blob, glyph, scaler, skGlyph, SkIntToScalar(vx), SkIntToScalar(vy));
return;
}
GrMaskFormat format = glyph->fMaskFormat;
PerSubRunInfo* subRun = &run.fSubRunInfo.back();
if (run.fInitialized && subRun->fMaskFormat != format) {
subRun = &run.push_back();
subRun->fStrike.reset(SkRef(fCurrStrike));
} else if (!run.fInitialized) {
subRun->fStrike.reset(SkRef(fCurrStrike));
}
run.fInitialized = true;
size_t vertexStride = GrAtlasTextBatch::GetVertexStride(format);
SkRect r;
r.fLeft = SkIntToScalar(x);
r.fTop = SkIntToScalar(y);
r.fRight = r.fLeft + SkIntToScalar(width);
r.fBottom = r.fTop + SkIntToScalar(height);
subRun->fMaskFormat = format;
this->appendGlyphCommon(blob, &run, subRun, r, color, vertexStride, kA8_GrMaskFormat == format,
glyph);
}
bool GrAtlasTextContext::dfAppendGlyph(GrAtlasTextBlob* blob, int runIndex,
const SkGlyph& skGlyph,
SkScalar sx, SkScalar sy, GrColor color,
GrFontScaler* scaler,
SkScalar textRatio, const SkMatrix& viewMatrix) {
Run& run = blob->fRuns[runIndex];
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);
// TODO combine with the above
// If the glyph is too large we fall back to paths
if (glyph->fTooLargeForAtlas) {
this->appendGlyphPath(blob, glyph, scaler, skGlyph, sx - dx, sy - dy, scale, true);
return true;
}
PerSubRunInfo* subRun = &run.fSubRunInfo.back();
if (!run.fInitialized) {
subRun->fStrike.reset(SkRef(fCurrStrike));
}
run.fInitialized = true;
SkASSERT(glyph->fMaskFormat == kA8_GrMaskFormat);
subRun->fMaskFormat = kA8_GrMaskFormat;
size_t vertexStride = GrAtlasTextBatch::GetVertexStrideDf(kA8_GrMaskFormat,
subRun->fUseLCDText);
bool useColorVerts = !subRun->fUseLCDText;
this->appendGlyphCommon(blob, &run, subRun, glyphRect, color, vertexStride, useColorVerts,
glyph);
return true;
}
inline void GrAtlasTextContext::appendGlyphPath(GrAtlasTextBlob* blob, GrGlyph* glyph,
GrFontScaler* scaler, const SkGlyph& skGlyph,
SkScalar x, SkScalar y, SkScalar scale,
bool applyVM) {
if (nullptr == glyph->fPath) {
const SkPath* glyphPath = scaler->getGlyphPath(skGlyph);
if (!glyphPath) {
return;
}
glyph->fPath = new SkPath(*glyphPath);
}
blob->fBigGlyphs.push_back(GrAtlasTextBlob::BigGlyph(*glyph->fPath, x, y, scale, applyVM));
}
inline void GrAtlasTextContext::appendGlyphCommon(GrAtlasTextBlob* blob, Run* run,
Run::SubRunInfo* subRun,
const SkRect& positions, GrColor color,
size_t vertexStride, bool useVertexColor,
GrGlyph* glyph) {
blob->fGlyphs[subRun->fGlyphEndIndex] = glyph;
run->fVertexBounds.joinNonEmptyArg(positions);
run->fColor = color;
intptr_t vertex = reinterpret_cast<intptr_t>(blob->fVertices + subRun->fVertexEndIndex);
if (useVertexColor) {
// V0
SkPoint* position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fLeft, positions.fTop);
SkColor* colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
*colorPtr = color;
vertex += vertexStride;
// V1
position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fLeft, positions.fBottom);
colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
*colorPtr = color;
vertex += vertexStride;
// V2
position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fRight, positions.fBottom);
colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
*colorPtr = color;
vertex += vertexStride;
// V3
position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fRight, positions.fTop);
colorPtr = reinterpret_cast<SkColor*>(vertex + sizeof(SkPoint));
*colorPtr = color;
} else {
// V0
SkPoint* position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fLeft, positions.fTop);
vertex += vertexStride;
// V1
position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fLeft, positions.fBottom);
vertex += vertexStride;
// V2
position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fRight, positions.fBottom);
vertex += vertexStride;
// V3
position = reinterpret_cast<SkPoint*>(vertex);
position->set(positions.fRight, positions.fTop);
}
subRun->fGlyphEndIndex++;
subRun->fVertexEndIndex += vertexStride * GrAtlasTextBatch::kVerticesPerGlyph;
}
void GrAtlasTextContext::flushRunAsPaths(GrDrawContext* dc,
const SkTextBlobRunIterator& it,
const GrClip& clip, const SkPaint& skPaint,
SkDrawFilter* drawFilter, const SkMatrix& viewMatrix,
const SkIRect& clipBounds, SkScalar x, SkScalar y) {
SkPaint runPaint = skPaint;
size_t textLen = it.glyphCount() * sizeof(uint16_t);
const SkPoint& offset = it.offset();
it.applyFontToPaint(&runPaint);
if (drawFilter && !drawFilter->filter(&runPaint, SkDrawFilter::kText_Type)) {
return;
}
runPaint.setFlags(FilterTextFlags(fSurfaceProps, runPaint));
switch (it.positioning()) {
case SkTextBlob::kDefault_Positioning:
this->drawTextAsPath(dc, clip, runPaint, viewMatrix,
(const char *)it.glyphs(),
textLen, x + offset.x(), y + offset.y(), clipBounds);
break;
case SkTextBlob::kHorizontal_Positioning:
this->drawPosTextAsPath(dc, clip, runPaint, viewMatrix,
(const char*)it.glyphs(),
textLen, it.pos(), 1, SkPoint::Make(x, y + offset.y()),
clipBounds);
break;
case SkTextBlob::kFull_Positioning:
this->drawPosTextAsPath(dc, clip, runPaint, viewMatrix,
(const char*)it.glyphs(),
textLen, it.pos(), 2, SkPoint::Make(x, y), clipBounds);
break;
}
}
inline GrDrawBatch*
GrAtlasTextContext::createBatch(GrAtlasTextBlob* cacheBlob, const PerSubRunInfo& info,
int glyphCount, int run, int subRun,
GrColor color, SkScalar transX, SkScalar transY,
const SkPaint& skPaint) {
GrMaskFormat format = info.fMaskFormat;
GrColor subRunColor;
if (kARGB_GrMaskFormat == format) {
uint8_t paintAlpha = skPaint.getAlpha();
subRunColor = SkColorSetARGB(paintAlpha, paintAlpha, paintAlpha, paintAlpha);
} else {
subRunColor = color;
}
GrAtlasTextBatch* batch;
if (info.fDrawAsDistanceFields) {
SkColor filteredColor;
SkColorFilter* colorFilter = skPaint.getColorFilter();
if (colorFilter) {
filteredColor = colorFilter->filterColor(skPaint.getColor());
} else {
filteredColor = skPaint.getColor();
}
bool useBGR = SkPixelGeometryIsBGR(fSurfaceProps.pixelGeometry());
batch = GrAtlasTextBatch::CreateDistanceField(glyphCount, fContext->getBatchFontCache(),
fDistanceAdjustTable, filteredColor,
info.fUseLCDText, useBGR);
} else {
batch = GrAtlasTextBatch::CreateBitmap(format, glyphCount, fContext->getBatchFontCache());
}
GrAtlasTextBatch::Geometry& geometry = batch->geometry();
geometry.fBlob = SkRef(cacheBlob);
geometry.fRun = run;
geometry.fSubRun = subRun;
geometry.fColor = subRunColor;
geometry.fTransX = transX;
geometry.fTransY = transY;
batch->init();
return batch;
}
inline void GrAtlasTextContext::flushRun(GrDrawContext* dc, GrPipelineBuilder* pipelineBuilder,
GrAtlasTextBlob* cacheBlob, int run, GrColor color,
SkScalar transX, SkScalar transY,
const SkPaint& skPaint) {
for (int subRun = 0; subRun < cacheBlob->fRuns[run].fSubRunInfo.count(); subRun++) {
const PerSubRunInfo& info = cacheBlob->fRuns[run].fSubRunInfo[subRun];
int glyphCount = info.fGlyphEndIndex - info.fGlyphStartIndex;
if (0 == glyphCount) {
continue;
}
SkAutoTUnref<GrDrawBatch> batch(this->createBatch(cacheBlob, info, glyphCount, run,
subRun, color, transX, transY,
skPaint));
dc->drawBatch(pipelineBuilder, batch);
}
}
inline void GrAtlasTextContext::flushBigGlyphs(GrAtlasTextBlob* cacheBlob,
GrDrawContext* dc,
const GrClip& clip, const SkPaint& skPaint,
SkScalar transX, SkScalar transY,
const SkIRect& clipBounds) {
if (!cacheBlob->fBigGlyphs.count()) {
return;
}
for (int i = 0; i < cacheBlob->fBigGlyphs.count(); i++) {
GrAtlasTextBlob::BigGlyph& bigGlyph = cacheBlob->fBigGlyphs[i];
bigGlyph.fVx += transX;
bigGlyph.fVy += transY;
SkMatrix ctm;
ctm.setScale(bigGlyph.fScale, bigGlyph.fScale);
ctm.postTranslate(bigGlyph.fVx, bigGlyph.fVy);
if (bigGlyph.fApplyVM) {
ctm.postConcat(cacheBlob->fViewMatrix);
}
GrBlurUtils::drawPathWithMaskFilter(fContext, dc, clip, bigGlyph.fPath,
skPaint, ctm, nullptr, clipBounds, false);
}
}
void GrAtlasTextContext::flush(const SkTextBlob* blob,
GrAtlasTextBlob* cacheBlob,
GrDrawContext* dc,
GrRenderTarget* rt,
const SkPaint& skPaint,
const GrPaint& grPaint,
SkDrawFilter* drawFilter,
const GrClip& clip,
const SkMatrix& viewMatrix,
const SkIRect& clipBounds,
SkScalar x, SkScalar y,
SkScalar transX, SkScalar transY) {
// We loop through the runs of the blob, flushing each. If any run is too large, then we flush
// it as paths
GrPipelineBuilder pipelineBuilder(grPaint, rt, clip);
GrColor color = grPaint.getColor();
SkTextBlobRunIterator it(blob);
for (int run = 0; !it.done(); it.next(), run++) {
if (cacheBlob->fRuns[run].fDrawAsPaths) {
this->flushRunAsPaths(dc, it, clip, skPaint,
drawFilter, viewMatrix, clipBounds, x, y);
continue;
}
cacheBlob->fRuns[run].fVertexBounds.offset(transX, transY);
this->flushRun(dc, &pipelineBuilder, cacheBlob, run, color,
transX, transY, skPaint);
}
// Now flush big glyphs
this->flushBigGlyphs(cacheBlob, dc, clip, skPaint, transX, transY, clipBounds);
}
void GrAtlasTextContext::flush(GrAtlasTextBlob* cacheBlob,
GrDrawContext* dc,
GrRenderTarget* rt,
const SkPaint& skPaint,
const GrPaint& grPaint,
const GrClip& clip,
const SkIRect& clipBounds) {
GrPipelineBuilder pipelineBuilder(grPaint, rt, clip);
GrColor color = grPaint.getColor();
for (int run = 0; run < cacheBlob->fRunCount; run++) {
this->flushRun(dc, &pipelineBuilder, cacheBlob, run, color, 0, 0, skPaint);
}
// Now flush big glyphs
this->flushBigGlyphs(cacheBlob, dc, clip, skPaint, 0, 0, clipBounds);
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#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 gTextContext->createBatch(blob, info, textLen, 0, 0, color, transX, transY, skPaint);
}
#endif
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