1// Copyright (c) 2012 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include "ui/gfx/canvas_paint_mac.h" 6#include "ui/gfx/size.h" 7 8namespace gfx { 9 10CanvasSkiaPaint::CanvasSkiaPaint(NSRect dirtyRect) 11 : context_(NULL), 12 rectangle_(dirtyRect), 13 composite_alpha_(false) { 14 Init(true); 15} 16 17CanvasSkiaPaint::CanvasSkiaPaint(NSRect dirtyRect, bool opaque) 18 : context_(NULL), 19 rectangle_(dirtyRect), 20 composite_alpha_(false) { 21 Init(opaque); 22} 23 24CanvasSkiaPaint::~CanvasSkiaPaint() { 25 if (!is_empty()) { 26 platform_canvas()->restoreToCount(1); 27 28 // Blit the dirty rect to the current context. 29 CGImageRef image = CGBitmapContextCreateImage(context_); 30 CGRect dest_rect = NSRectToCGRect(rectangle_); 31 32 CGContextRef destination_context = 33 (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort]; 34 CGContextSaveGState(destination_context); 35 CGContextSetBlendMode( 36 destination_context, 37 composite_alpha_ ? kCGBlendModeNormal : kCGBlendModeCopy); 38 39 if ([[NSGraphicsContext currentContext] isFlipped]) { 40 // Mirror context on the target's rect middle scanline. 41 CGContextTranslateCTM(destination_context, 0.0, NSMidY(rectangle_)); 42 CGContextScaleCTM(destination_context, 1.0, -1.0); 43 CGContextTranslateCTM(destination_context, 0.0, -NSMidY(rectangle_)); 44 } 45 46 CGContextDrawImage(destination_context, dest_rect, image); 47 CGContextRestoreGState(destination_context); 48 49 CFRelease(image); 50 } 51} 52 53void CanvasSkiaPaint::Init(bool opaque) { 54 CGContextRef destination_context = 55 (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort]; 56 CGRect scaled_unit_rect = CGContextConvertRectToDeviceSpace( 57 destination_context, CGRectMake(0, 0, 1, 1)); 58 // Assume that the x scale and the y scale are the same. 59 CGFloat scale = scaled_unit_rect.size.width; 60 61 gfx::Size size(NSWidth(rectangle_), NSHeight(rectangle_)); 62 RecreateBackingCanvas(size, scale, opaque); 63 skia::PlatformCanvas* canvas = platform_canvas(); 64 canvas->clear(SkColorSetARGB(0, 0, 0, 0)); 65 66 // Need to translate so that the dirty region appears at the origin of the 67 // surface. 68 canvas->translate(-SkDoubleToScalar(NSMinX(rectangle_)), 69 -SkDoubleToScalar(NSMinY(rectangle_))); 70 71 context_ = skia::GetBitmapContext(skia::GetTopDevice(*canvas)); 72} 73 74} // namespace skia 75 76 77