| /* |
| * 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; |
| } |