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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/src/core/SkBitmapScaler.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
SkPixmap srcPixmap(MakeSkiaImageInfo(IntSize(srcWidth, srcHeight), format),
srcData, srcStride);
// Rescaler is compatible with N32 only. Convert to N32 if needed.
SkBitmap tmpBitmap;
if (srcPixmap.colorType() != kN32_SkColorType) {
if (!tmpBitmap.tryAllocPixels(
SkImageInfo::MakeN32Premul(srcWidth, srcHeight)) ||
!tmpBitmap.writePixels(srcPixmap) ||
!tmpBitmap.peekPixels(&srcPixmap)) {
return false;
}
}
SkPixmap dstPixmap(SkImageInfo::MakeN32Premul(dstWidth, dstHeight), dstData,
dstStride);
return SkBitmapScaler::Resize(dstPixmap, srcPixmap,
SkBitmapScaler::RESIZE_LANCZOS3);
#else
return false;
#endif
}
} // namespace gfx
} // namespace mozilla
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