michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "Scale.h"
michael@0: 
michael@0: #ifdef USE_SKIA
michael@0: #include "HelpersSkia.h"
michael@0: #include "skia/SkBitmap.h"
michael@0: #include "image_operations.h"
michael@0: #endif
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace gfx {
michael@0: 
michael@0: bool Scale(uint8_t* srcData, int32_t srcWidth, int32_t srcHeight, int32_t srcStride,
michael@0:            uint8_t* dstData, int32_t dstWidth, int32_t dstHeight, int32_t dstStride,
michael@0:            SurfaceFormat format)
michael@0: {
michael@0: #ifdef USE_SKIA
michael@0:   SkAlphaType alphaType;
michael@0:   if (format == SurfaceFormat::B8G8R8A8) {
michael@0:     alphaType = kPremul_SkAlphaType;
michael@0:   } else {
michael@0:     alphaType = kOpaque_SkAlphaType;
michael@0:   }
michael@0: 
michael@0:   SkBitmap::Config config = GfxFormatToSkiaConfig(format);
michael@0: 
michael@0:   SkBitmap imgSrc;
michael@0:   imgSrc.setConfig(config, srcWidth, srcHeight, srcStride, alphaType);
michael@0:   imgSrc.setPixels(srcData);
michael@0: 
michael@0:   // Rescaler is compatible with 32 bpp only. Convert to RGB32 if needed.
michael@0:   if (config != SkBitmap::kARGB_8888_Config) {
michael@0:     imgSrc.copyTo(&imgSrc, kRGBA_8888_SkColorType);
michael@0:   }
michael@0: 
michael@0:   // This returns an SkBitmap backed by dstData; since it also wrote to dstData,
michael@0:   // we don't need to look at that SkBitmap.
michael@0:   SkBitmap result = skia::ImageOperations::Resize(imgSrc,
michael@0:                                                   skia::ImageOperations::RESIZE_BEST,
michael@0:                                                   dstWidth, dstHeight,
michael@0:                                                   dstData);
michael@0: 
michael@0:   return !result.isNull();
michael@0: #else
michael@0:   return false;
michael@0: #endif
michael@0: }
michael@0: 
michael@0: }
michael@0: }