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-rw-r--r--gfx/2d/Scale.cpp44
1 files changed, 44 insertions, 0 deletions
diff --git a/gfx/2d/Scale.cpp b/gfx/2d/Scale.cpp
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+++ b/gfx/2d/Scale.cpp
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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/include/core/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
+ SkBitmap imgSrc;
+ imgSrc.installPixels(MakeSkiaImageInfo(IntSize(srcWidth, srcHeight), format),
+ srcData, srcStride);
+
+ // Rescaler is compatible with 32 bpp only. Convert to RGB32 if needed.
+ if (imgSrc.colorType() != kBGRA_8888_SkColorType) {
+ 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
+}
+
+} // namespace gfx
+} // namespace mozilla