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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/mac/graphics_context_canvas.h"
#import <AppKit/AppKit.h>
#import <CoreGraphics/CoreGraphics.h>
#include "skia/ext/skia_utils_mac.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/retain_ptr.h"
namespace blink {
GraphicsContextCanvas::GraphicsContextCanvas(PaintCanvas* canvas,
const SkIRect& paint_rect,
SkScalar bitmap_scale_factor)
: canvas_(canvas),
cg_context_(0),
bitmap_scale_factor_(bitmap_scale_factor),
paint_rect_(paint_rect) {
// Callers should just avoid painting at all when this is the case.
DCHECK(!paint_rect_.isEmpty());
}
GraphicsContextCanvas::~GraphicsContextCanvas() {
ReleaseIfNeeded();
}
// This must be called to balance calls to cgContext
void GraphicsContextCanvas::ReleaseIfNeeded() {
if (!cg_context_)
return;
offscreen_.setImmutable(); // Prevents a defensive copy inside Skia.
canvas_->save();
canvas_->setMatrix(SkMatrix::I()); // Reset back to device space.
canvas_->translate(paint_rect_.x(), paint_rect_.y());
canvas_->scale(1.f / bitmap_scale_factor_, 1.f / bitmap_scale_factor_);
canvas_->drawBitmap(offscreen_, 0, 0);
canvas_->restore();
CGContextRelease(cg_context_);
cg_context_ = 0;
}
CGContextRef GraphicsContextCanvas::CgContext() {
ReleaseIfNeeded(); // This flushes any prior bitmap use
// Allocate an offscreen and draw into that, relying on the
// compositing step to apply skia's clip.
WTF::RetainPtr<CGColorSpace> color_space(
CGColorSpaceCreateWithName(kCGColorSpaceSRGB));
bool result = offscreen_.tryAllocN32Pixels(
SkScalarCeilToInt(bitmap_scale_factor_ * paint_rect_.width()),
SkScalarCeilToInt(bitmap_scale_factor_ * paint_rect_.height()));
DCHECK(result);
if (!result)
return 0;
offscreen_.eraseColor(0);
int display_height = offscreen_.height();
cg_context_ = CGBitmapContextCreate(
offscreen_.getPixels(), offscreen_.width(), offscreen_.height(), 8,
offscreen_.rowBytes(), color_space.Get(),
kCGBitmapByteOrder32Host | kCGImageAlphaPremultipliedFirst);
DCHECK(cg_context_);
SkMatrix matrix = canvas_->getTotalMatrix();
matrix.postTranslate(-SkIntToScalar(paint_rect_.x()),
-SkIntToScalar(paint_rect_.y()));
matrix.postScale(bitmap_scale_factor_, -bitmap_scale_factor_);
matrix.postTranslate(0, SkIntToScalar(display_height));
CGContextConcatCTM(cg_context_, skia::SkMatrixToCGAffineTransform(matrix));
return cg_context_;
}
} // namespace blink
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