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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 "GrTextUtils.h"
#include "GrContext.h"
#include "SkDrawFilter.h"
#include "SkGlyphCache.h"
#include "SkGr.h"
#include "SkPaint.h"
#include "SkTextBlobRunIterator.h"
void GrTextUtils::Paint::initFilteredColor() {
// This mirrors the logic in skpaint_to_grpaint_impl for handling paint colors
if (fDstColorSpaceInfo->colorSpace()) {
GrColor4f filteredColor =
SkColorToUnpremulGrColor4f(fPaint->getColor(), *fDstColorSpaceInfo);
if (fPaint->getColorFilter()) {
filteredColor = GrColor4f::FromSkColor4f(
fPaint->getColorFilter()->filterColor4f(filteredColor.toSkColor4f()));
}
fFilteredPremulColor = filteredColor.premul().toGrColor();
} else {
SkColor filteredSkColor = fPaint->getColor();
if (fPaint->getColorFilter()) {
filteredSkColor = fPaint->getColorFilter()->filterColor(filteredSkColor);
}
fFilteredPremulColor = SkColorToPremulGrColor(filteredSkColor);
}
}
bool GrTextUtils::RunPaint::modifyForRun(std::function<void(SkPaint*)> paintModFunc) {
if (!fModifiedPaint.isValid()) {
fModifiedPaint.init(fOriginalPaint->skPaint());
fPaint = fModifiedPaint.get();
} else if (fFilter) {
// We have to reset before applying the run because the filter could have arbitrary
// changed the paint.
*fModifiedPaint.get() = fOriginalPaint->skPaint();
}
paintModFunc(fModifiedPaint.get());
if (fFilter) {
if (!fFilter->filter(fModifiedPaint.get(), SkDrawFilter::kText_Type)) {
// A false return from filter() means we should abort the current draw.
return false;
}
// The draw filter could have changed either the paint color or color filter.
this->initFilteredColor();
}
fModifiedPaint.get()->setFlags(FilterTextFlags(fProps, *fModifiedPaint.get()));
return true;
}
uint32_t GrTextUtils::FilterTextFlags(const SkSurfaceProps& surfaceProps, const SkPaint& paint) {
uint32_t flags = paint.getFlags();
if (!paint.isLCDRenderText() || !paint.isAntiAlias()) {
return flags;
}
if (kUnknown_SkPixelGeometry == surfaceProps.pixelGeometry() || ShouldDisableLCD(paint)) {
flags &= ~SkPaint::kLCDRenderText_Flag;
flags |= SkPaint::kGenA8FromLCD_Flag;
}
return flags;
}
bool GrTextUtils::ShouldDisableLCD(const SkPaint& paint) {
return paint.getMaskFilter() || paint.getPathEffect() ||
paint.isFakeBoldText() || paint.getStyle() != SkPaint::kFill_Style;
}
bool GrTextUtils::PathTextIter::next(const SkGlyph** skGlyph, const SkPath** path, SkScalar* xpos) {
SkASSERT(skGlyph);
SkASSERT(path);
SkASSERT(xpos);
if (fText < fStop) {
const SkGlyph& glyph = fGlyphCacheProc(fCache, &fText);
fXPos += (fPrevAdvance + fAutoKern.adjust(glyph)) * fScale;
SkASSERT(0 == fXYIndex || 1 == fXYIndex);
fPrevAdvance = SkFloatToScalar((&glyph.fAdvanceX)[fXYIndex]);
if (glyph.fWidth) {
if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
*skGlyph = &glyph;
*path = nullptr;
} else {
*skGlyph = nullptr;
*path = fCache->findPath(glyph);
}
} else {
*skGlyph = nullptr;
*path = nullptr;
}
*xpos = fXPos;
return true;
}
return false;
}
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