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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 "GrAtlasTextBlob.h"
#include "GrBatchFontCache.h"
#include "GrBlurUtils.h"
#include "GrContext.h"
#include "GrDrawContext.h"
#include "GrTextContext.h"
#include "SkDrawProcs.h"
#include "SkFindAndPlaceGlyph.h"
#include "SkGlyphCache.h"
#include "SkPaint.h"
#include "SkRect.h"
#include "SkTextMapStateProc.h"
#include "SkTextToPathIter.h"
void GrTextUtils::DrawBmpText(GrAtlasTextBlob* blob, int runIndex,
GrBatchFontCache* fontCache,
const SkSurfaceProps& props, 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;
}
// Ensure the blob is set for bitmaptext
blob->setHasBitmap();
GrBatchTextStrike* currStrike = nullptr;
// Get GrFontScaler from cache
SkGlyphCache* cache = blob->setupCache(runIndex, props, skPaint, &viewMatrix, false);
GrFontScaler* fontScaler = GrTextContext::GetGrFontScaler(cache);
SkFindAndPlaceGlyph::ProcessText(
skPaint.getTextEncoding(), text, byteLength,
{x, y}, viewMatrix, skPaint.getTextAlign(),
cache,
[&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) {
position += rounding;
BmpAppendGlyph(
blob, runIndex, fontCache, &currStrike, glyph,
SkScalarFloorToInt(position.fX), SkScalarFloorToInt(position.fY),
color, fontScaler);
}
);
SkGlyphCache::AttachCache(cache);
}
void GrTextUtils::DrawBmpPosText(GrAtlasTextBlob* blob, int runIndex,
GrBatchFontCache* fontCache,
const SkSurfaceProps& props, 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;
}
// Ensure the blob is set for bitmaptext
blob->setHasBitmap();
GrBatchTextStrike* currStrike = nullptr;
// Get GrFontScaler from cache
SkGlyphCache* cache = blob->setupCache(runIndex, props, skPaint, &viewMatrix, false);
GrFontScaler* fontScaler = GrTextContext::GetGrFontScaler(cache);
SkFindAndPlaceGlyph::ProcessPosText(
skPaint.getTextEncoding(), text, byteLength,
offset, viewMatrix, pos, scalarsPerPosition,
skPaint.getTextAlign(), cache,
[&](const SkGlyph& glyph, SkPoint position, SkPoint rounding) {
position += rounding;
BmpAppendGlyph(
blob, runIndex, fontCache, &currStrike, glyph,
SkScalarFloorToInt(position.fX), SkScalarFloorToInt(position.fY),
color, fontScaler);
}
);
SkGlyphCache::AttachCache(cache);
}
void GrTextUtils::BmpAppendGlyph(GrAtlasTextBlob* blob, int runIndex,
GrBatchFontCache* fontCache,
GrBatchTextStrike** strike, const SkGlyph& skGlyph,
int vx, int vy, GrColor color, GrFontScaler* scaler) {
if (!*strike) {
*strike = fontCache->getStrike(scaler);
}
GrGlyph::PackedID id = GrGlyph::Pack(skGlyph.getGlyphID(),
skGlyph.getSubXFixed(),
skGlyph.getSubYFixed(),
GrGlyph::kCoverage_MaskStyle);
GrGlyph* glyph = (*strike)->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();
SkRect r;
r.fLeft = SkIntToScalar(x);
r.fTop = SkIntToScalar(y);
r.fRight = r.fLeft + SkIntToScalar(width);
r.fBottom = r.fTop + SkIntToScalar(height);
blob->appendGlyph(runIndex, r, color, *strike, glyph, scaler, skGlyph,
SkIntToScalar(vx), SkIntToScalar(vy), 1.0f, false);
}
void GrTextUtils::DrawTextAsPath(GrContext* context, GrDrawContext* dc,
const GrClip& clip,
const SkPaint& skPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength, SkScalar x, SkScalar y,
const SkIRect& clipBounds) {
SkTextToPathIter iter(text, byteLength, skPaint, 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();
GrBlurUtils::drawPathWithMaskFilter(context, dc, clip, *iterPath,
pnt, viewMatrix, &matrix, clipBounds, false);
}
prevXPos = xpos;
}
}
void GrTextUtils::DrawPosTextAsPath(GrContext* context,
GrDrawContext* dc,
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) {
// 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);
SkDrawCacheProc glyphCacheProc = paint.getDrawCacheProc();
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.getPathEffect());
while (text < stop) {
const SkGlyph& glyph = glyphCacheProc(cache, &text, 0, 0);
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;
GrBlurUtils::drawPathWithMaskFilter(context, dc, clip, *path, paint,
viewMatrix, &matrix, clipBounds, false);
}
}
pos += scalarsPerPosition;
}
}
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