gfx/ycbcr/YCbCrUtils.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "gfx2DGlue.h"
   7
   8 #include "YCbCrUtils.h"
   9 #include "yuv_convert.h"
  10 #include "ycbcr_to_rgb565.h"
  11
  12 namespace mozilla {
  13 namespace gfx {
  14
  15 void
  16 GetYCbCrToRGBDestFormatAndSize(const layers::PlanarYCbCrData& aData,
  17                                SurfaceFormat& aSuggestedFormat,
  18                                IntSize& aSuggestedSize)
  19 {
  20   YUVType yuvtype =
  21     TypeFromSize(aData.mYSize.width,
  22                  aData.mYSize.height,
  23                  aData.mCbCrSize.width,
  24                  aData.mCbCrSize.height);
  25
  26   // 'prescale' is true if the scaling is to be done as part of the
  27   // YCbCr to RGB conversion rather than on the RGB data when rendered.
  28   bool prescale = aSuggestedSize.width > 0 && aSuggestedSize.height > 0 &&
  29                   aSuggestedSize != aData.mPicSize;
  30
  31   if (aSuggestedFormat == SurfaceFormat::R5G6B5) {
  32 #if defined(HAVE_YCBCR_TO_RGB565)
  33     if (prescale &&
  34         !IsScaleYCbCrToRGB565Fast(aData.mPicX,
  35                                   aData.mPicY,
  36                                   aData.mPicSize.width,
  37                                   aData.mPicSize.height,
  38                                   aSuggestedSize.width,
  39                                   aSuggestedSize.height,
  40                                   yuvtype,
  41                                   FILTER_BILINEAR) &&
  42         IsConvertYCbCrToRGB565Fast(aData.mPicX,
  43                                    aData.mPicY,
  44                                    aData.mPicSize.width,
  45                                    aData.mPicSize.height,
  46                                    yuvtype)) {
  47       prescale = false;
  48     }
  49 #else
  50     // yuv2rgb16 function not available
  51     aSuggestedFormat = SurfaceFormat::B8G8R8X8;
  52 #endif
  53   }
  54   else if (aSuggestedFormat != SurfaceFormat::B8G8R8X8) {
  55     // No other formats are currently supported.
  56     aSuggestedFormat = SurfaceFormat::B8G8R8X8;
  57   }
  58   if (aSuggestedFormat == SurfaceFormat::B8G8R8X8) {
  59     /* ScaleYCbCrToRGB32 does not support a picture offset, nor 4:4:4 data.
  60      See bugs 639415 and 640073. */
  61     if (aData.mPicX != 0 || aData.mPicY != 0 || yuvtype == YV24)
  62       prescale = false;
  63   }
  64   if (!prescale) {
  65     aSuggestedSize = aData.mPicSize;
  66   }
  67 }
  68
  69 void
  70 ConvertYCbCrToRGB(const layers::PlanarYCbCrData& aData,
  71                   const SurfaceFormat& aDestFormat,
  72                   const IntSize& aDestSize,
  73                   unsigned char* aDestBuffer,
  74                   int32_t aStride)
  75 {
  76   // ConvertYCbCrToRGB et al. assume the chroma planes are rounded up if the
  77   // luma plane is odd sized.
  78   MOZ_ASSERT((aData.mCbCrSize.width == aData.mYSize.width ||
  79               aData.mCbCrSize.width == (aData.mYSize.width + 1) >> 1) &&
  80              (aData.mCbCrSize.height == aData.mYSize.height ||
  81               aData.mCbCrSize.height == (aData.mYSize.height + 1) >> 1));
  82   YUVType yuvtype =
  83     TypeFromSize(aData.mYSize.width,
  84                  aData.mYSize.height,
  85                  aData.mCbCrSize.width,
  86                  aData.mCbCrSize.height);
  87
  88   // Convert from YCbCr to RGB now, scaling the image if needed.
  89   if (aDestSize != aData.mPicSize) {
  90 #if defined(HAVE_YCBCR_TO_RGB565)
  91     if (aDestFormat == SurfaceFormat::R5G6B5) {
  92       ScaleYCbCrToRGB565(aData.mYChannel,
  93                          aData.mCbChannel,
  94                          aData.mCrChannel,
  95                          aDestBuffer,
  96                          aData.mPicX,
  97                          aData.mPicY,
  98                          aData.mPicSize.width,
  99                          aData.mPicSize.height,
 100                          aDestSize.width,
 101                          aDestSize.height,
 102                          aData.mYStride,
 103                          aData.mCbCrStride,
 104                          aStride,
 105                          yuvtype,
 106                          FILTER_BILINEAR);
 107     } else
 108 #endif
 109       ScaleYCbCrToRGB32(aData.mYChannel, //
 110                         aData.mCbChannel,
 111                         aData.mCrChannel,
 112                         aDestBuffer,
 113                         aData.mPicSize.width,
 114                         aData.mPicSize.height,
 115                         aDestSize.width,
 116                         aDestSize.height,
 117                         aData.mYStride,
 118                         aData.mCbCrStride,
 119                         aStride,
 120                         yuvtype,
 121                         ROTATE_0,
 122                         FILTER_BILINEAR);
 123   } else { // no prescale
 124 #if defined(HAVE_YCBCR_TO_RGB565)
 125     if (aDestFormat == SurfaceFormat::R5G6B5) {
 126       ConvertYCbCrToRGB565(aData.mYChannel,
 127                            aData.mCbChannel,
 128                            aData.mCrChannel,
 129                            aDestBuffer,
 130                            aData.mPicX,
 131                            aData.mPicY,
 132                            aData.mPicSize.width,
 133                            aData.mPicSize.height,
 134                            aData.mYStride,
 135                            aData.mCbCrStride,
 136                            aStride,
 137                            yuvtype);
 138     } else // aDestFormat != gfxImageFormat::RGB16_565
 139 #endif
 140       ConvertYCbCrToRGB32(aData.mYChannel, //
 141                           aData.mCbChannel,
 142                           aData.mCrChannel,
 143                           aDestBuffer,
 144                           aData.mPicX,
 145                           aData.mPicY,
 146                           aData.mPicSize.width,
 147                           aData.mPicSize.height,
 148                           aData.mYStride,
 149                           aData.mCbCrStride,
 150                           aStride,
 151                           yuvtype);
 152   }
 153 }
 154
 155 }
 156 }