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/*
* 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 "MinikinUtils.h"
#include "Paint.h"
#include "Properties.h"
#include "RecordingCanvas.h"
#include "RenderNode.h"
#include "Typeface.h"
#include "pipeline/skia/SkiaRecordingCanvas.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);
}
static inline void drawStroke(SkScalar left, SkScalar right, SkScalar top, SkScalar thickness,
const SkPaint& paint, Canvas* canvas) {
const SkScalar strokeWidth = fmax(thickness, 1.0f);
const SkScalar bottom = top + strokeWidth;
canvas->drawRect(left, top, right, bottom, paint);
}
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)) {
const SkScalar left = x;
const SkScalar right = x + length;
if (flags & SkPaint::kUnderlineText_ReserveFlag) {
Paint::FontMetrics metrics;
paint.getFontMetrics(&metrics);
SkScalar position;
if (!metrics.hasUnderlinePosition(&position)) {
position = paint.getTextSize() * Paint::kStdUnderline_Top;
}
SkScalar thickness;
if (!metrics.hasUnderlineThickness(&thickness)) {
thickness = paint.getTextSize() * Paint::kStdUnderline_Thickness;
}
const SkScalar top = y + position;
drawStroke(left, right, top, thickness, paint, this);
}
if (flags & SkPaint::kStrikeThruText_ReserveFlag) {
const float textSize = paint.getTextSize();
const float position = textSize * Paint::kStdStrikeThru_Top;
const SkScalar thickness = textSize * Paint::kStdStrikeThru_Thickness;
const SkScalar top = y + position;
drawStroke(left, right, top, thickness, paint, this);
}
}
}
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, const SkPaint& paint, float x,
float y, minikin::MinikinRect& bounds, float totalAdvance)
: layout(layout)
, canvas(canvas)
, paint(paint)
, x(x)
, y(y)
, bounds(bounds)
, totalAdvance(totalAdvance) {}
void operator()(size_t start, size_t end) {
auto glyphFunc = [&](uint16_t* text, float* positions) {
if (canvas->drawTextAbsolutePos()) {
for (size_t i = start, textIndex = 0, posIndex = 0; i < end; i++) {
text[textIndex++] = layout.getGlyphId(i);
positions[posIndex++] = x + layout.getX(i);
positions[posIndex++] = y + layout.getY(i);
}
} else {
for (size_t i = start, textIndex = 0, posIndex = 0; i < end; i++) {
text[textIndex++] = layout.getGlyphId(i);
positions[posIndex++] = layout.getX(i);
positions[posIndex++] = 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(glyphFunc, 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(glyphFunc, glyphCount, innerPaint, x, y, bounds.mLeft, bounds.mTop,
bounds.mRight, bounds.mBottom, totalAdvance);
} else {
// standard draw path
canvas->drawGlyphs(glyphFunc, glyphCount, paint, x, y, bounds.mLeft, bounds.mTop,
bounds.mRight, bounds.mBottom, totalAdvance);
}
}
private:
const minikin::Layout& layout;
Canvas* canvas;
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, minikin::Bidi bidiFlags, const Paint& origPaint,
const Typeface* typeface, minikin::MeasuredText* mt, int mtOffset) {
// minikin may modify the original paint
Paint paint(origPaint);
minikin::Layout layout =
MinikinUtils::doLayout(&paint, bidiFlags, typeface, text, start, count, contextCount,
mt, mtOffset);
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, 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, minikin::Bidi bidiFlags,
const SkPath& path, float hOffset, float vOffset, const Paint& paint,
const Typeface* typeface) {
Paint paintCopy(paint);
minikin::Layout layout =
MinikinUtils::doLayout(&paintCopy, bidiFlags, typeface, text, 0, count, count, nullptr,
0);
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