blob: 0f8ddf8adcd8a9354fab27d222e421cd41327d7d [file] [log] [blame]
// 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 <stdint.h>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "skia/ext/platform_device.h"
namespace skia {
// A device is basically a wrapper around SkBitmap that provides a surface for
// SkCanvas to draw into. Our device provides a surface CoreGraphics can also
// write to. BitmapPlatformDevice creates a bitmap using
// CGCreateBitmapContext() in a format that Skia supports and can then use this
// to draw text into, etc. This pixel data is provided to the bitmap that the
// device contains so that it can be shared.
// The device owns the pixel data, when the device goes away, the pixel data
// also becomes invalid. THIS IS DIFFERENT THAN NORMAL SKIA which uses
// reference counting for the pixel data. In normal Skia, you could assign
// another bitmap to this device's bitmap and everything will work properly.
// For us, that other bitmap will become invalid as soon as the device becomes
// invalid, which may lead to subtle bugs. Therefore, DO NOT ASSIGN THE
// DEVICE'S PIXEL DATA TO ANOTHER BITMAP, make sure you copy instead.
class SK_API BitmapPlatformDevice : public SkBitmapDevice, public PlatformDevice {
// Creates a BitmapPlatformDevice instance. |is_opaque| should be set if the
// caller knows the bitmap will be completely opaque and allows some
// optimizations.
// |context| may be NULL. If |context| is NULL, then the bitmap backing store
// is not initialized.
static BitmapPlatformDevice* Create(CGContextRef context,
int width, int height,
bool is_opaque, bool do_clear = false);
// Creates a context for |data| and calls Create.
// If |data| is NULL, then the bitmap backing store is not initialized.
static BitmapPlatformDevice* CreateWithData(uint8_t* data,
int width, int height,
bool is_opaque);
~BitmapPlatformDevice() override;
// PlatformDevice overrides
CGContextRef GetBitmapContext(const SkMatrix& transform,
const SkIRect& clip_bounds) override;
BitmapPlatformDevice(CGContextRef context,
const SkBitmap& bitmap);
SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) override;
void ReleaseBitmapContext();
// Loads the current transform and clip into the context. Can be called even
// when |bitmap_context_| is NULL (will be a NOP).
void LoadConfig(const SkMatrix& transform, const SkIRect& clip_bounds);
// Lazily-created graphics context used to draw into the bitmap.
CGContextRef bitmap_context_;
} // namespace skia