blob: de2daa6e7985040a5104261f2e67bcb1ff2c1875 [file] [log] [blame]
// 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 "base/logging.h"
#include "build/build_config.h"
#include "skia/ext/platform_device.h"
#include "third_party/skia/include/core/SkMetaData.h"
#include "third_party/skia/include/core/SkTypes.h"
namespace {
#if defined(OS_MACOSX)
const char kIsPreviewMetafileKey[] = "CrIsPreviewMetafile";
void SetBoolMetaData(const SkCanvas& canvas, const char* key, bool value) {
SkMetaData& meta = skia::GetMetaData(canvas);
meta.setBool(key, value);
}
bool GetBoolMetaData(const SkCanvas& canvas, const char* key) {
bool value;
SkMetaData& meta = skia::GetMetaData(canvas);
if (!meta.findBool(key, &value))
value = false;
return value;
}
#endif
} // namespace
namespace skia {
SkBitmap ReadPixels(SkCanvas* canvas) {
SkBitmap bitmap;
bitmap.setInfo(canvas->imageInfo());
canvas->readPixels(&bitmap, 0, 0);
return bitmap;
}
bool GetWritablePixels(SkCanvas* canvas, SkPixmap* result) {
if (!canvas || !result) {
return false;
}
SkImageInfo info;
size_t row_bytes;
void* pixels = canvas->accessTopLayerPixels(&info, &row_bytes);
if (!pixels) {
result->reset();
return false;
}
result->reset(info, pixels, row_bytes);
return true;
}
bool SupportsPlatformPaint(const SkCanvas* canvas) {
return GetPlatformDevice(canvas->getTopDevice(true)) != nullptr;
}
size_t PlatformCanvasStrideForWidth(unsigned width) {
return 4 * width;
}
SkCanvas* CreateCanvas(const sk_sp<SkBaseDevice>& device,
OnFailureType failureType) {
if (!device) {
if (CRASH_ON_FAILURE == failureType)
SK_CRASH();
return nullptr;
}
return new SkCanvas(device.get());
}
SkMetaData& GetMetaData(const SkCanvas& canvas) {
SkBaseDevice* device = canvas.getDevice();
DCHECK(device != nullptr);
return device->getMetaData();
}
#if defined(OS_MACOSX)
void SetIsPreviewMetafile(const SkCanvas& canvas, bool is_preview) {
SetBoolMetaData(canvas, kIsPreviewMetafileKey, is_preview);
}
bool IsPreviewMetafile(const SkCanvas& canvas) {
return GetBoolMetaData(canvas, kIsPreviewMetafileKey);
}
CGContextRef GetBitmapContext(const SkCanvas& canvas) {
PlatformDevice* platform_device =
GetPlatformDevice(canvas.getTopDevice(true));
SkIRect clip_bounds;
canvas.getClipDeviceBounds(&clip_bounds);
return platform_device ?
platform_device->GetBitmapContext(
canvas.getTotalMatrix(), clip_bounds) :
nullptr;
}
#endif
ScopedPlatformPaint::ScopedPlatformPaint(SkCanvas* canvas) :
canvas_(canvas),
platform_surface_(nullptr) {
// TODO(tomhudson) we're assuming non-null canvas?
PlatformDevice* platform_device = GetPlatformDevice(canvas->getTopDevice(true));
if (platform_device) {
// Compensate for drawing to a layer rather than the entire canvas
SkMatrix ctm;
SkIRect clip_bounds;
canvas->temporary_internal_describeTopLayer(&ctm, &clip_bounds);
platform_surface_ = platform_device->BeginPlatformPaint(ctm, clip_bounds);
}
}
} // namespace skia