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40 lines
1.4 KiB
C++
40 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* 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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#include "HelpersSkia.h"
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#include "skia/src/core/SkBitmapScaler.h"
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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,
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int32_t srcStride, uint8_t* dstData, int32_t dstWidth,
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int32_t dstHeight, int32_t dstStride, SurfaceFormat format) {
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SkPixmap srcPixmap(MakeSkiaImageInfo(IntSize(srcWidth, srcHeight), format),
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srcData, srcStride);
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// Rescaler is compatible with N32 only. Convert to N32 if needed.
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SkBitmap tmpBitmap;
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if (srcPixmap.colorType() != kN32_SkColorType) {
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if (!tmpBitmap.tryAllocPixels(
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SkImageInfo::MakeN32Premul(srcWidth, srcHeight)) ||
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!tmpBitmap.writePixels(srcPixmap) ||
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!tmpBitmap.peekPixels(&srcPixmap)) {
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return false;
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}
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}
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SkPixmap dstPixmap(SkImageInfo::MakeN32Premul(dstWidth, dstHeight), dstData,
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dstStride);
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return SkBitmapScaler::Resize(dstPixmap, srcPixmap,
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SkBitmapScaler::RESIZE_LANCZOS3);
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}
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} // namespace gfx
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} // namespace mozilla
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