gecko-dev/gfx/ycbcr/yuv_convert.h

// Copyright (c) 2010 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_BASE_YUV_CONVERT_H_
#define MEDIA_BASE_YUV_CONVERT_H_

#include "chromium_types.h"
#include "gfxCore.h"

namespace mozilla {

namespace gfx {
 
// Type of YUV surface.
// The value of these enums matter as they are used to shift vertical indices.
enum YUVType {
  YV12 = 0,           // YV12 is half width and half height chroma channels.
  YV16 = 1,           // YV16 is half width and full height chroma channels.
  YV24 = 2            // YV24 is full width and full height chroma channels.
};

// Mirror means flip the image horizontally, as in looking in a mirror.
// Rotate happens after mirroring.
enum Rotate {
  ROTATE_0,           // Rotation off.
  ROTATE_90,          // Rotate clockwise.
  ROTATE_180,         // Rotate upside down.
  ROTATE_270,         // Rotate counter clockwise.
  MIRROR_ROTATE_0,    // Mirror horizontally.
  MIRROR_ROTATE_90,   // Mirror then Rotate clockwise.
  MIRROR_ROTATE_180,  // Mirror vertically.
  MIRROR_ROTATE_270   // Transpose.
};

// Filter affects how scaling looks.
enum ScaleFilter {
  FILTER_NONE = 0,        // No filter (point sampled).
  FILTER_BILINEAR_H = 1,  // Bilinear horizontal filter.
  FILTER_BILINEAR_V = 2,  // Bilinear vertical filter.
  FILTER_BILINEAR = 3     // Bilinear filter.
};

NS_GFX_(YUVType) TypeFromSize(int ywidth, int yheight, int cbcrwidth, int cbcrheight);

// Convert a frame of YUV to 32 bit ARGB.
// Pass in YV16/YV12 depending on source format
NS_GFX_(void) ConvertYCbCrToRGB32(const uint8* yplane,
                                  const uint8* uplane,
                                  const uint8* vplane,
                                  uint8* rgbframe,
                                  int pic_x,
                                  int pic_y,
                                  int pic_width,
                                  int pic_height,
                                  int ystride,
                                  int uvstride,
                                  int rgbstride,
                                  YUVType yuv_type);

// Scale a frame of YUV to 32 bit ARGB.
// Supports rotation and mirroring.
NS_GFX_(void) ScaleYCbCrToRGB32(const uint8* yplane,
                                const uint8* uplane,
                                const uint8* vplane,
                                uint8* rgbframe,
                                int source_width,
                                int source_height,
                                int width,
                                int height,
                                int ystride,
                                int uvstride,
                                int rgbstride,
                                YUVType yuv_type,
                                Rotate view_rotate,
                                ScaleFilter filter);

}  // namespace gfx
}  // namespace mozilla
 
#endif  // MEDIA_BASE_YUV_CONVERT_H_