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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "Scale.h"
#ifdef USE_SKIA
#include "HelpersSkia.h"
#include "skia/SkBitmap.h"
#include "image_operations.h"
#endif
namespace mozilla {
namespace gfx {
bool Scale(uint8_t* srcData, int32_t srcWidth, int32_t srcHeight, int32_t srcStride,
uint8_t* dstData, int32_t dstWidth, int32_t dstHeight, int32_t dstStride,
SurfaceFormat format)
{
#ifdef USE_SKIA
SkAlphaType alphaType;
if (format == SurfaceFormat::B8G8R8A8) {
alphaType = kPremul_SkAlphaType;
} else {
alphaType = kOpaque_SkAlphaType;
}
SkImageInfo info = SkImageInfo::Make(srcWidth,
srcHeight,
GfxFormatToSkiaColorType(format),
alphaType);
SkBitmap imgSrc;
imgSrc.installPixels(info, srcData, srcStride);
// Rescaler is compatible with 32 bpp only. Convert to RGB32 if needed.
if (format != SurfaceFormat::B8G8R8A8) {
imgSrc.copyTo(&imgSrc, kBGRA_8888_SkColorType);
}
// This returns an SkBitmap backed by dstData; since it also wrote to dstData,
// we don't need to look at that SkBitmap.
SkBitmap result = skia::ImageOperations::Resize(imgSrc,
skia::ImageOperations::RESIZE_BEST,
dstWidth, dstHeight,
dstData);
return !result.isNull();
#else
return false;
#endif
}
}
}
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