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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 "SkDrawProcs.h"
#include "SkGlyphCache.h"
#include "SkGr.h"
#include "SkPaint.h"
#include "SkTextBlobRunIterator.h"
#include "SkTextMapStateProc.h"
#include "SkTextToPathIter.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(const SkTextBlobRunIterator& run) {
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();
}
run.applyFontToPaint(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.getRasterizer() || paint.getPathEffect() ||
paint.isFakeBoldText() || paint.getStyle() != SkPaint::kFill_Style;
}
void GrTextUtils::DrawTextAsPath(GrContext* context, GrTextUtils::Target* target,
const GrClip& clip, const SkPaint& paint,
const SkMatrix& viewMatrix, const char text[], size_t byteLength,
SkScalar x, SkScalar y, const SkIRect& clipBounds) {
if (!paint.countText(text, byteLength)) {
return;
}
SkTextToPathIter iter(text, byteLength, paint, true);
SkMatrix matrix;
matrix.setScale(iter.getPathScale(), iter.getPathScale());
matrix.postTranslate(x, y);
const SkPath* iterPath;
SkScalar xpos, prevXPos = 0;
while (iter.next(&iterPath, &xpos)) {
matrix.postTranslate(xpos - prevXPos, 0);
if (iterPath) {
const SkPaint& pnt = iter.getPaint();
target->drawPath(clip, *iterPath, pnt, viewMatrix, &matrix, clipBounds);
}
prevXPos = xpos;
}
}
void GrTextUtils::DrawPosTextAsPath(GrContext* context, GrTextUtils::Target* target,
const SkSurfaceProps& props, const GrClip& clip,
const SkPaint& origPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength, const SkScalar pos[],
int scalarsPerPosition, const SkPoint& offset,
const SkIRect& clipBounds) {
if (!origPaint.countText(text, byteLength)) {
return;
}
// setup our std paint, in hopes of getting hits in the cache
SkPaint paint(origPaint);
SkScalar matrixScale = paint.setupForAsPaths();
SkMatrix matrix;
matrix.setScale(matrixScale, matrixScale);
// Temporarily jam in kFill, so we only ever ask for the raw outline from the cache.
paint.setStyle(SkPaint::kFill_Style);
paint.setPathEffect(nullptr);
SkPaint::GlyphCacheProc glyphCacheProc = SkPaint::GetGlyphCacheProc(paint.getTextEncoding(),
paint.isDevKernText(),
true);
SkAutoGlyphCache autoCache(paint, &props, nullptr);
SkGlyphCache* cache = autoCache.getCache();
const char* stop = text + byteLength;
SkTextAlignProc alignProc(paint.getTextAlign());
SkTextMapStateProc tmsProc(SkMatrix::I(), offset, scalarsPerPosition);
// Now restore the original settings, so we "draw" with whatever style/stroking.
paint.setStyle(origPaint.getStyle());
paint.setPathEffect(origPaint.refPathEffect());
while (text < stop) {
const SkGlyph& glyph = glyphCacheProc(cache, &text);
if (glyph.fWidth) {
const SkPath* path = cache->findPath(glyph);
if (path) {
SkPoint tmsLoc;
tmsProc(pos, &tmsLoc);
SkPoint loc;
alignProc(tmsLoc, glyph, &loc);
matrix[SkMatrix::kMTransX] = loc.fX;
matrix[SkMatrix::kMTransY] = loc.fY;
target->drawPath(clip, *path, paint, viewMatrix, &matrix, clipBounds);
}
}
pos += scalarsPerPosition;
}
}
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