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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.
#ifndef MEDIA_RENDERERS_SKCANVAS_VIDEO_RENDERER_H_
#define MEDIA_RENDERERS_SKCANVAS_VIDEO_RENDERER_H_
#include <stddef.h>
#include <stdint.h>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "media/base/media_export.h"
#include "media/base/timestamp_constants.h"
#include "media/base/video_frame.h"
#include "media/base/video_rotation.h"
#include "media/filters/context_3d.h"
#include "skia/ext/refptr.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkXfermode.h"
class SkCanvas;
class SkImage;
namespace gfx {
class RectF;
}
namespace media {
class VideoImageGenerator;
// Handles rendering of VideoFrames to SkCanvases.
class MEDIA_EXPORT SkCanvasVideoRenderer {
public:
SkCanvasVideoRenderer();
~SkCanvasVideoRenderer();
// Paints |video_frame| on |canvas|, scaling and rotating the result to fit
// dimensions specified by |dest_rect|.
// If the format of |video_frame| is PIXEL_FORMAT_NATIVE_TEXTURE, |context_3d|
// must be provided.
//
// Black will be painted on |canvas| if |video_frame| is null.
void Paint(const scoped_refptr<VideoFrame>& video_frame,
SkCanvas* canvas,
const gfx::RectF& dest_rect,
uint8_t alpha,
SkXfermode::Mode mode,
VideoRotation video_rotation,
const Context3D& context_3d);
// Copy |video_frame| on |canvas|.
// If the format of |video_frame| is PIXEL_FORMAT_NATIVE_TEXTURE, |context_3d|
// must be provided.
void Copy(const scoped_refptr<VideoFrame>& video_frame,
SkCanvas* canvas,
const Context3D& context_3d);
// Convert the contents of |video_frame| to raw RGB pixels. |rgb_pixels|
// should point into a buffer large enough to hold as many 32 bit RGBA pixels
// as are in the visible_rect() area of the frame.
static void ConvertVideoFrameToRGBPixels(const media::VideoFrame* video_frame,
void* rgb_pixels,
size_t row_bytes);
// Copy the contents of texture of |video_frame| to texture |texture|.
// |level|, |internal_format|, |type| specify target texture |texture|.
// The format of |video_frame| must be VideoFrame::NATIVE_TEXTURE.
static void CopyVideoFrameSingleTextureToGLTexture(
gpu::gles2::GLES2Interface* gl,
VideoFrame* video_frame,
unsigned int texture,
unsigned int internal_format,
unsigned int type,
bool premultiply_alpha,
bool flip_y);
// In general, We hold the most recently painted frame to increase the
// performance for the case that the same frame needs to be painted
// repeatedly. Call this function if you are sure the most recent frame will
// never be painted again, so we can release the resource.
void ResetCache();
private:
// Last image used to draw to the canvas.
skia::RefPtr<SkImage> last_image_;
// Timestamp of the videoframe used to generate |last_image_|.
base::TimeDelta last_timestamp_ = media::kNoTimestamp();
// If |last_image_| is not used for a while, it's deleted to save memory.
base::DelayTimer last_image_deleting_timer_;
// Used for DCHECKs to ensure method calls executed in the correct thread.
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
};
} // namespace media
#endif // MEDIA_RENDERERS_SKCANVAS_VIDEO_RENDERER_H_
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