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// Copyright (c) 2012 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 "base/basictypes.h"
#include "base/compiler_specific.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/canvas_skia_paint.h"
#include "ui/gfx/rect.h"
namespace gfx {
CanvasSkiaPaint::CanvasSkiaPaint(GdkEventExpose* event)
: context_(NULL),
window_(event->window),
region_(gdk_region_copy(event->region)),
composite_alpha_(false) {
Init(true);
}
CanvasSkiaPaint::CanvasSkiaPaint(GdkEventExpose* event, bool opaque)
: context_(NULL),
window_(event->window),
region_(gdk_region_copy(event->region)),
composite_alpha_(false) {
Init(opaque);
}
CanvasSkiaPaint::~CanvasSkiaPaint() {
if (!is_empty()) {
platform_canvas()->restoreToCount(1);
// Blit the dirty rect to the window.
CHECK(window_);
cairo_t* cr = gdk_cairo_create(window_);
CHECK(cr);
if (composite_alpha_)
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_surface_t* source_surface = cairo_get_target(context_);
CHECK(source_surface);
// Flush cairo's cache of the surface.
cairo_surface_mark_dirty(source_surface);
GdkRectangle bounds = rectangle();
cairo_set_source_surface(cr, source_surface, bounds.x, bounds.y);
gdk_cairo_region(cr, region_);
cairo_fill(cr);
cairo_destroy(cr);
}
gdk_region_destroy(region_);
}
void CanvasSkiaPaint::Init(bool opaque) {
GdkRectangle bounds = rectangle();
RecreateBackingCanvas(gfx::Size(bounds.width, bounds.height),
ui::SCALE_FACTOR_100P, opaque);
skia::PlatformCanvas* canvas = platform_canvas();
// Need to translate so that the dirty region appears at the origin of the
// surface.
canvas->translate(-SkIntToScalar(bounds.x), -SkIntToScalar(bounds.y));
context_ = skia::BeginPlatformPaint(canvas);
}
} // namespace gfx
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