| // 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 "base/mac/scoped_cftyperef.h" |
| #include "cc/paint/paint_canvas.h" |
| #include "skia/ext/skia_utils_mac.h" |
| #include "third_party/blink/renderer/platform/runtime_enabled_features.h" |
| |
| namespace blink { |
| |
| GraphicsContextCanvas::GraphicsContextCanvas(cc::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_->drawImage(cc::PaintImage::CreateFromBitmap(std::move(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. |
| base::ScopedCFTypeRef<CGColorSpaceRef> 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, |
| 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 |