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/*
* Copyright 2010 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 "GrContext.h"
#include "GrFontScaler.h"
#include "GrTextUtils.h"
#include "SkDrawFilter.h"
#include "SkGlyphCache.h"
#include "SkGrPriv.h"
#include "SkTextBlobRunIterator.h"
GrTextContext::GrTextContext(GrContext* context, const SkSurfaceProps& surfaceProps)
: fFallbackTextContext(nullptr)
, fContext(context)
, fSurfaceProps(surfaceProps) {
}
GrTextContext::~GrTextContext() {
delete fFallbackTextContext;
}
void GrTextContext::drawText(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& clipBounds) {
if (fContext->abandoned()) {
return;
}
GrTextContext* textContext = this;
do {
if (textContext->canDraw(skPaint, viewMatrix)) {
textContext->onDrawText(dc, clip, paint, skPaint, viewMatrix,
text, byteLength, x, y, clipBounds);
return;
}
textContext = textContext->fFallbackTextContext;
} while (textContext);
// fall back to drawing as a path
GrTextUtils::DrawTextAsPath(fContext, dc, clip, skPaint, viewMatrix, text, byteLength, x, y,
clipBounds);
}
void GrTextContext::drawPosText(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& clipBounds) {
if (fContext->abandoned()) {
return;
}
GrTextContext* textContext = this;
do {
if (textContext->canDraw(skPaint, viewMatrix)) {
textContext->onDrawPosText(dc, clip, paint, skPaint, viewMatrix,
text, byteLength, pos,
scalarsPerPosition, offset, clipBounds);
return;
}
textContext = textContext->fFallbackTextContext;
} while (textContext);
// fall back to drawing as a path
GrTextUtils::DrawPosTextAsPath(fContext, dc, fSurfaceProps, clip, skPaint, viewMatrix, text,
byteLength, pos, scalarsPerPosition, offset, clipBounds);
}
bool GrTextContext::ShouldDisableLCD(const SkPaint& paint) {
if (!SkXfermode::AsMode(paint.getXfermode(), nullptr) ||
paint.getMaskFilter() ||
paint.getRasterizer() ||
paint.getPathEffect() ||
paint.isFakeBoldText() ||
paint.getStyle() != SkPaint::kFill_Style)
{
return true;
}
return false;
}
uint32_t GrTextContext::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;
}
void GrTextContext::drawTextBlob(GrDrawContext* dc,
const GrClip& clip, const SkPaint& skPaint,
const SkMatrix& viewMatrix, const SkTextBlob* blob,
SkScalar x, SkScalar y,
SkDrawFilter* drawFilter, const SkIRect& clipBounds) {
SkPaint runPaint = skPaint;
SkTextBlobRunIterator it(blob);
for (;!it.done(); it.next()) {
size_t textLen = it.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));
GrPaint grPaint;
if (!SkPaintToGrPaint(fContext, runPaint, viewMatrix, &grPaint)) {
return;
}
switch (it.positioning()) {
case SkTextBlob::kDefault_Positioning:
this->drawText(dc, clip, grPaint, runPaint, viewMatrix, (const char *)it.glyphs(),
textLen, x + offset.x(), y + offset.y(), clipBounds);
break;
case SkTextBlob::kHorizontal_Positioning:
this->drawPosText(dc, clip, grPaint, runPaint, viewMatrix, (const char*)it.glyphs(),
textLen, it.pos(), 1, SkPoint::Make(x, y + offset.y()), clipBounds);
break;
case SkTextBlob::kFull_Positioning:
this->drawPosText(dc, clip, grPaint, runPaint, viewMatrix, (const char*)it.glyphs(),
textLen, it.pos(), 2, SkPoint::Make(x, y), clipBounds);
break;
default:
SkFAIL("unhandled positioning mode");
}
if (drawFilter) {
// A draw filter may change the paint arbitrarily, so we must re-seed in this case.
runPaint = skPaint;
}
}
}
static void GlyphCacheAuxProc(void* data) {
GrFontScaler* scaler = (GrFontScaler*)data;
SkSafeUnref(scaler);
}
GrFontScaler* GrTextContext::GetGrFontScaler(SkGlyphCache* cache) {
void* auxData;
GrFontScaler* scaler = nullptr;
if (cache->getAuxProcData(GlyphCacheAuxProc, &auxData)) {
scaler = (GrFontScaler*)auxData;
}
if (nullptr == scaler) {
scaler = new GrFontScaler(cache);
cache->setAuxProc(GlyphCacheAuxProc, scaler);
}
return scaler;
}
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