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54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "Scale.h"
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#ifdef USE_SKIA
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#include "HelpersSkia.h"
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#include "skia/SkBitmap.h"
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#include "image_operations.h"
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#endif
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namespace mozilla {
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namespace gfx {
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bool Scale(uint8_t* srcData, int32_t srcWidth, int32_t srcHeight, int32_t srcStride,
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uint8_t* dstData, int32_t dstWidth, int32_t dstHeight, int32_t dstStride,
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SurfaceFormat format)
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{
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#ifdef USE_SKIA
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SkAlphaType alphaType;
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if (format == SurfaceFormat::B8G8R8A8) {
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alphaType = kPremul_SkAlphaType;
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} else {
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alphaType = kOpaque_SkAlphaType;
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}
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SkBitmap::Config config = GfxFormatToSkiaConfig(format);
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SkBitmap imgSrc;
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imgSrc.setConfig(config, srcWidth, srcHeight, srcStride, alphaType);
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imgSrc.setPixels(srcData);
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// Rescaler is compatible with 32 bpp only. Convert to RGB32 if needed.
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if (config != SkBitmap::kARGB_8888_Config) {
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imgSrc.copyTo(&imgSrc, kRGBA_8888_SkColorType);
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}
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// This returns an SkBitmap backed by dstData; since it also wrote to dstData,
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// we don't need to look at that SkBitmap.
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SkBitmap result = skia::ImageOperations::Resize(imgSrc,
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skia::ImageOperations::RESIZE_BEST,
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dstWidth, dstHeight,
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dstData);
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return !result.isNull();
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#else
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return false;
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#endif
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}
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}
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}
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