The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/gfx/2d/Scale.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,53 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +#include "Scale.h"
     1.9 +
    1.10 +#ifdef USE_SKIA
    1.11 +#include "HelpersSkia.h"
    1.12 +#include "skia/SkBitmap.h"
    1.13 +#include "image_operations.h"
    1.14 +#endif
    1.15 +
    1.16 +namespace mozilla {
    1.17 +namespace gfx {
    1.18 +
    1.19 +bool Scale(uint8_t* srcData, int32_t srcWidth, int32_t srcHeight, int32_t srcStride,
    1.20 +           uint8_t* dstData, int32_t dstWidth, int32_t dstHeight, int32_t dstStride,
    1.21 +           SurfaceFormat format)
    1.22 +{
    1.23 +#ifdef USE_SKIA
    1.24 +  SkAlphaType alphaType;
    1.25 +  if (format == SurfaceFormat::B8G8R8A8) {
    1.26 +    alphaType = kPremul_SkAlphaType;
    1.27 +  } else {
    1.28 +    alphaType = kOpaque_SkAlphaType;
    1.29 +  }
    1.30 +
    1.31 +  SkBitmap::Config config = GfxFormatToSkiaConfig(format);
    1.32 +
    1.33 +  SkBitmap imgSrc;
    1.34 +  imgSrc.setConfig(config, srcWidth, srcHeight, srcStride, alphaType);
    1.35 +  imgSrc.setPixels(srcData);
    1.36 +
    1.37 +  // Rescaler is compatible with 32 bpp only. Convert to RGB32 if needed.
    1.38 +  if (config != SkBitmap::kARGB_8888_Config) {
    1.39 +    imgSrc.copyTo(&imgSrc, kRGBA_8888_SkColorType);
    1.40 +  }
    1.41 +
    1.42 +  // This returns an SkBitmap backed by dstData; since it also wrote to dstData,
    1.43 +  // we don't need to look at that SkBitmap.
    1.44 +  SkBitmap result = skia::ImageOperations::Resize(imgSrc,
    1.45 +                                                  skia::ImageOperations::RESIZE_BEST,
    1.46 +                                                  dstWidth, dstHeight,
    1.47 +                                                  dstData);
    1.48 +
    1.49 +  return !result.isNull();
    1.50 +#else
    1.51 +  return false;
    1.52 +#endif
    1.53 +}
    1.54 +
    1.55 +}
    1.56 +}