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 "base/basictypes.h" 6 #include "base/compiler_specific.h" 7 #include "ui/gfx/canvas.h" 8 #include "ui/gfx/canvas_skia_paint.h" 9 #include "ui/gfx/rect.h" 10 11 namespace gfx { 12 13 CanvasSkiaPaint::CanvasSkiaPaint(GdkEventExpose* event) 14 : context_(NULL), 15 window_(event->window), 16 region_(gdk_region_copy(event->region)), 17 composite_alpha_(false) { 18 Init(true); 19 } 20 21 CanvasSkiaPaint::CanvasSkiaPaint(GdkEventExpose* event, bool opaque) 22 : context_(NULL), 23 window_(event->window), 24 region_(gdk_region_copy(event->region)), 25 composite_alpha_(false) { 26 Init(opaque); 27 } 28 29 CanvasSkiaPaint::~CanvasSkiaPaint() { 30 if (!is_empty()) { 31 platform_canvas()->restoreToCount(1); 32 33 // Blit the dirty rect to the window. 34 CHECK(window_); 35 cairo_t* cr = gdk_cairo_create(window_); 36 CHECK(cr); 37 if (composite_alpha_) 38 cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); 39 cairo_surface_t* source_surface = cairo_get_target(context_); 40 CHECK(source_surface); 41 // Flush cairo's cache of the surface. 42 cairo_surface_mark_dirty(source_surface); 43 GdkRectangle bounds = rectangle(); 44 cairo_set_source_surface(cr, source_surface, bounds.x, bounds.y); 45 gdk_cairo_region(cr, region_); 46 cairo_fill(cr); 47 cairo_destroy(cr); 48 } 49 50 gdk_region_destroy(region_); 51 } 52 53 void CanvasSkiaPaint::Init(bool opaque) { 54 GdkRectangle bounds = rectangle(); 55 RecreateBackingCanvas(gfx::Size(bounds.width, bounds.height), 56 ui::SCALE_FACTOR_100P, opaque); 57 58 skia::PlatformCanvas* canvas = platform_canvas(); 59 60 // Need to translate so that the dirty region appears at the origin of the 61 // surface. 62 canvas->translate(-SkIntToScalar(bounds.x), -SkIntToScalar(bounds.y)); 63 64 context_ = skia::BeginPlatformPaint(canvas); 65 } 66 67 } // namespace gfx 68 69 70
