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// Copyright (c) 2011 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 "skia/ext/platform_canvas.h"
#include "skia/ext/bitmap_platform_device.h"
#include "third_party/skia/include/core/SkTypes.h"
namespace skia {
PlatformCanvas::PlatformCanvas() {}
SkDevice* PlatformCanvas::setBitmapDevice(const SkBitmap&) {
SkASSERT(false); // Should not be called.
return NULL;
}
// static
size_t PlatformCanvas::StrideForWidth(unsigned width) {
return 4 * width;
}
bool PlatformCanvas::initializeWithDevice(SkDevice* device) {
if (!device)
return false;
setDevice(device);
device->unref(); // Was created with refcount 1, and setDevice also refs.
return true;
}
SkCanvas* CreateBitmapCanvas(int width, int height, bool is_opaque) {
return new PlatformCanvas(width, height, is_opaque);
}
SkCanvas* TryCreateBitmapCanvas(int width, int height, bool is_opaque) {
PlatformCanvas* canvas = new PlatformCanvas();
if (!canvas->initialize(width, height, is_opaque)) {
delete canvas;
canvas = NULL;
}
return canvas;
}
SkDevice* GetTopDevice(const SkCanvas& canvas) {
SkCanvas::LayerIter iter(const_cast<SkCanvas*>(&canvas), false);
return iter.device();
}
bool SupportsPlatformPaint(const SkCanvas* canvas) {
// TODO(alokp): Rename IsNativeFontRenderingAllowed after removing these
// calls from WebKit.
PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
return platform_device && platform_device->IsNativeFontRenderingAllowed();
}
PlatformSurface BeginPlatformPaint(SkCanvas* canvas) {
PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
if (platform_device)
return platform_device->BeginPlatformPaint();
return 0;
}
void EndPlatformPaint(SkCanvas* canvas) {
PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
if (platform_device)
platform_device->EndPlatformPaint();
}
void DrawToNativeContext(SkCanvas* canvas, PlatformSurface context, int x,
int y, const PlatformRect* src_rect) {
PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
if (platform_device)
platform_device->DrawToNativeContext(context, x, y, src_rect);
}
static SkPMColor MakeOpaqueXfermodeProc(SkPMColor src, SkPMColor dst) {
return dst | (0xFF << SK_A32_SHIFT);
}
void MakeOpaque(SkCanvas* canvas, int x, int y, int width, int height) {
if (width <= 0 || height <= 0)
return;
SkRect rect;
rect.setXYWH(SkIntToScalar(x), SkIntToScalar(y),
SkIntToScalar(width), SkIntToScalar(height));
SkPaint paint;
// so we don't draw anything on a device that ignores xfermodes
paint.setColor(0);
// install our custom mode
paint.setXfermode(new SkProcXfermode(MakeOpaqueXfermodeProc))->unref();
canvas->drawRect(rect, paint);
}
} // namespace skia
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