| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "Canvas.h" |
| |
| #include "RecordingCanvas.h" |
| #include "RenderNode.h" |
| #include "MinikinUtils.h" |
| #include "Paint.h" |
| #include "Properties.h" |
| #include "pipeline/skia/SkiaRecordingCanvas.h" |
| #include "Typeface.h" |
| |
| #include <SkDrawFilter.h> |
| |
| namespace android { |
| |
| Canvas* Canvas::create_recording_canvas(int width, int height, uirenderer::RenderNode* renderNode) { |
| if (uirenderer::Properties::isSkiaEnabled()) { |
| return new uirenderer::skiapipeline::SkiaRecordingCanvas(renderNode, width, height); |
| } |
| return new uirenderer::RecordingCanvas(width, height); |
| } |
| |
| void Canvas::drawTextDecorations(float x, float y, float length, const SkPaint& paint) { |
| uint32_t flags; |
| SkDrawFilter* drawFilter = getDrawFilter(); |
| if (drawFilter) { |
| SkPaint paintCopy(paint); |
| drawFilter->filter(&paintCopy, SkDrawFilter::kText_Type); |
| flags = paintCopy.getFlags(); |
| } else { |
| flags = paint.getFlags(); |
| } |
| if (flags & (SkPaint::kUnderlineText_ReserveFlag | SkPaint::kStrikeThruText_ReserveFlag)) { |
| // Same values used by Skia |
| const float kStdStrikeThru_Offset = (-6.0f / 21.0f); |
| const float kStdUnderline_Offset = (1.0f / 9.0f); |
| const float kStdUnderline_Thickness = (1.0f / 18.0f); |
| |
| SkScalar left = x; |
| SkScalar right = x + length; |
| float textSize = paint.getTextSize(); |
| float strokeWidth = fmax(textSize * kStdUnderline_Thickness, 1.0f); |
| if (flags & SkPaint::kUnderlineText_ReserveFlag) { |
| SkScalar top = y + textSize * kStdUnderline_Offset - 0.5f * strokeWidth; |
| SkScalar bottom = y + textSize * kStdUnderline_Offset + 0.5f * strokeWidth; |
| drawRect(left, top, right, bottom, paint); |
| } |
| if (flags & SkPaint::kStrikeThruText_ReserveFlag) { |
| SkScalar top = y + textSize * kStdStrikeThru_Offset - 0.5f * strokeWidth; |
| SkScalar bottom = y + textSize * kStdStrikeThru_Offset + 0.5f * strokeWidth; |
| drawRect(left, top, right, bottom, paint); |
| } |
| } |
| } |
| |
| static void simplifyPaint(int color, SkPaint* paint) { |
| paint->setColor(color); |
| paint->setShader(nullptr); |
| paint->setColorFilter(nullptr); |
| paint->setLooper(nullptr); |
| paint->setStrokeWidth(4 + 0.04 * paint->getTextSize()); |
| paint->setStrokeJoin(SkPaint::kRound_Join); |
| paint->setLooper(nullptr); |
| } |
| |
| class DrawTextFunctor { |
| public: |
| DrawTextFunctor(const minikin::Layout& layout, Canvas* canvas, uint16_t* glyphs, float* pos, |
| const SkPaint& paint, float x, float y, minikin::MinikinRect& bounds, |
| float totalAdvance) |
| : layout(layout) |
| , canvas(canvas) |
| , glyphs(glyphs) |
| , pos(pos) |
| , paint(paint) |
| , x(x) |
| , y(y) |
| , bounds(bounds) |
| , totalAdvance(totalAdvance) { |
| } |
| |
| void operator()(size_t start, size_t end) { |
| if (canvas->drawTextAbsolutePos()) { |
| for (size_t i = start; i < end; i++) { |
| glyphs[i] = layout.getGlyphId(i); |
| pos[2 * i] = x + layout.getX(i); |
| pos[2 * i + 1] = y + layout.getY(i); |
| } |
| } else { |
| for (size_t i = start; i < end; i++) { |
| glyphs[i] = layout.getGlyphId(i); |
| pos[2 * i] = layout.getX(i); |
| pos[2 * i + 1] = layout.getY(i); |
| } |
| } |
| |
| size_t glyphCount = end - start; |
| |
| if (CC_UNLIKELY(canvas->isHighContrastText() && paint.getAlpha() != 0)) { |
| // high contrast draw path |
| int color = paint.getColor(); |
| int channelSum = SkColorGetR(color) + SkColorGetG(color) + SkColorGetB(color); |
| bool darken = channelSum < (128 * 3); |
| |
| // outline |
| SkPaint outlinePaint(paint); |
| simplifyPaint(darken ? SK_ColorWHITE : SK_ColorBLACK, &outlinePaint); |
| outlinePaint.setStyle(SkPaint::kStrokeAndFill_Style); |
| canvas->drawGlyphs(glyphs + start, pos + (2 * start), glyphCount, outlinePaint, x, y, |
| bounds.mLeft, bounds.mTop, bounds.mRight, bounds.mBottom, totalAdvance); |
| |
| // inner |
| SkPaint innerPaint(paint); |
| simplifyPaint(darken ? SK_ColorBLACK : SK_ColorWHITE, &innerPaint); |
| innerPaint.setStyle(SkPaint::kFill_Style); |
| canvas->drawGlyphs(glyphs + start, pos + (2 * start), glyphCount, innerPaint, x, y, |
| bounds.mLeft, bounds.mTop, bounds.mRight, bounds.mBottom, totalAdvance); |
| } else { |
| // standard draw path |
| canvas->drawGlyphs(glyphs + start, pos + (2 * start), glyphCount, paint, x, y, |
| bounds.mLeft, bounds.mTop, bounds.mRight, bounds.mBottom, totalAdvance); |
| } |
| } |
| private: |
| const minikin::Layout& layout; |
| Canvas* canvas; |
| uint16_t* glyphs; |
| float* pos; |
| const SkPaint& paint; |
| float x; |
| float y; |
| minikin::MinikinRect& bounds; |
| float totalAdvance; |
| }; |
| |
| void Canvas::drawText(const uint16_t* text, int start, int count, int contextCount, |
| float x, float y, int bidiFlags, const Paint& origPaint, Typeface* typeface) { |
| // minikin may modify the original paint |
| Paint paint(origPaint); |
| |
| minikin::Layout layout = MinikinUtils::doLayout( |
| &paint, bidiFlags, typeface, text, start, count, contextCount); |
| |
| size_t nGlyphs = layout.nGlyphs(); |
| std::unique_ptr<uint16_t[]> glyphs(new uint16_t[nGlyphs]); |
| std::unique_ptr<float[]> pos(new float[nGlyphs * 2]); |
| |
| x += MinikinUtils::xOffsetForTextAlign(&paint, layout); |
| |
| minikin::MinikinRect bounds; |
| layout.getBounds(&bounds); |
| if (!drawTextAbsolutePos()) { |
| bounds.offset(x, y); |
| } |
| |
| // Set align to left for drawing, as we don't want individual |
| // glyphs centered or right-aligned; the offset above takes |
| // care of all alignment. |
| paint.setTextAlign(Paint::kLeft_Align); |
| |
| DrawTextFunctor f(layout, this, glyphs.get(), pos.get(), |
| paint, x, y, bounds, layout.getAdvance()); |
| MinikinUtils::forFontRun(layout, &paint, f); |
| } |
| |
| class DrawTextOnPathFunctor { |
| public: |
| DrawTextOnPathFunctor(const minikin::Layout& layout, Canvas* canvas, float hOffset, |
| float vOffset, const Paint& paint, const SkPath& path) |
| : layout(layout) |
| , canvas(canvas) |
| , hOffset(hOffset) |
| , vOffset(vOffset) |
| , paint(paint) |
| , path(path) { |
| } |
| |
| void operator()(size_t start, size_t end) { |
| canvas->drawLayoutOnPath(layout, hOffset, vOffset, paint, path, start, end); |
| } |
| private: |
| const minikin::Layout& layout; |
| Canvas* canvas; |
| float hOffset; |
| float vOffset; |
| const Paint& paint; |
| const SkPath& path; |
| }; |
| |
| void Canvas::drawTextOnPath(const uint16_t* text, int count, int bidiFlags, const SkPath& path, |
| float hOffset, float vOffset, const Paint& paint, Typeface* typeface) { |
| Paint paintCopy(paint); |
| minikin::Layout layout = MinikinUtils::doLayout( |
| &paintCopy, bidiFlags, typeface, text, 0, count, count); |
| hOffset += MinikinUtils::hOffsetForTextAlign(&paintCopy, layout, path); |
| |
| // Set align to left for drawing, as we don't want individual |
| // glyphs centered or right-aligned; the offset above takes |
| // care of all alignment. |
| paintCopy.setTextAlign(Paint::kLeft_Align); |
| |
| DrawTextOnPathFunctor f(layout, this, hOffset, vOffset, paintCopy, path); |
| MinikinUtils::forFontRun(layout, &paintCopy, f); |
| } |
| |
| } // namespace android |