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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 "ConvolutionFilter.h"
#include "HelpersSkia.h"
#include "SkConvolver.h"
#include "skia/include/core/SkBitmap.h"
namespace mozilla::gfx {
ConvolutionFilter::ConvolutionFilter()
: mFilter(MakeUnique<skia::SkConvolutionFilter1D>()) {}
ConvolutionFilter::~ConvolutionFilter() = default;
int32_t ConvolutionFilter::MaxFilter() const { return mFilter->maxFilter(); }
int32_t ConvolutionFilter::NumValues() const { return mFilter->numValues(); }
bool ConvolutionFilter::GetFilterOffsetAndLength(int32_t aRowIndex,
int32_t* aResultOffset,
int32_t* aResultLength) {
if (aRowIndex >= mFilter->numValues()) {
return false;
}
mFilter->FilterForValue(aRowIndex, aResultOffset, aResultLength);
return true;
}
void ConvolutionFilter::ConvolveHorizontally(const uint8_t* aSrc, uint8_t* aDst,
SurfaceFormat aFormat) {
skia::convolve_horizontally(aSrc, *mFilter, aDst, aFormat);
}
void ConvolutionFilter::ConvolveVertically(uint8_t* const* aSrc, uint8_t* aDst,
int32_t aRowIndex, int32_t aRowSize,
SurfaceFormat aFormat) {
MOZ_ASSERT(aRowIndex < mFilter->numValues());
int32_t filterOffset;
int32_t filterLength;
auto filterValues =
mFilter->FilterForValue(aRowIndex, &filterOffset, &filterLength);
skia::convolve_vertically(filterValues, filterLength, aSrc, aRowSize, aDst,
aFormat);
}
bool ConvolutionFilter::ComputeResizeFilter(ResizeMethod aResizeMethod,
int32_t aSrcSize,
int32_t aDstSize) {
if (aSrcSize < 0 || aDstSize < 0) {
return false;
}
switch (aResizeMethod) {
case ResizeMethod::BOX:
return mFilter->ComputeFilterValues(skia::SkBoxFilter(), aSrcSize,
aDstSize);
case ResizeMethod::LANCZOS3:
return mFilter->ComputeFilterValues(skia::SkLanczosFilter(), aSrcSize,
aDstSize);
default:
return false;
}
}
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,
SamplingFilter aFilter) {
if (!srcData || !dstData || srcWidth < 1 || srcHeight < 1 || dstWidth < 1 ||
dstHeight < 1) {
return false;
}
switch (format) {
case SurfaceFormat::B8G8R8A8:
case SurfaceFormat::B8G8R8X8:
case SurfaceFormat::R8G8B8A8:
case SurfaceFormat::R8G8B8X8:
// 4 byte formats with alpha at last byte are supported.
break;
case SurfaceFormat::A8:
// 1 byte formats are supported.
break;
default:
return false;
}
SkPixmap srcPixmap(MakeSkiaImageInfo(IntSize(srcWidth, srcHeight), format),
srcData, srcStride);
switch (aFilter) {
case SamplingFilter::LINEAR:
case SamplingFilter::POINT: {
SkPixmap dstPixmap(
MakeSkiaImageInfo(IntSize(dstWidth, dstHeight), format), dstData,
dstStride);
return srcPixmap.scalePixels(
dstPixmap, SkSamplingOptions(aFilter == SamplingFilter::POINT
? SkFilterMode::kNearest
: SkFilterMode::kLinear));
}
case SamplingFilter::GOOD:
default:
break;
}
ConvolutionFilter xFilter;
ConvolutionFilter yFilter;
ConvolutionFilter* xOrYFilter = &xFilter;
bool isSquare = srcWidth == srcHeight && dstWidth == dstHeight;
if (!xFilter.ComputeResizeFilter(ConvolutionFilter::ResizeMethod::LANCZOS3,
srcWidth, dstWidth)) {
return false;
}
if (!isSquare) {
if (!yFilter.ComputeResizeFilter(ConvolutionFilter::ResizeMethod::LANCZOS3,
srcHeight, dstHeight)) {
return false;
}
xOrYFilter = &yFilter;
}
return skia::BGRAConvolve2D(
static_cast<const uint8_t*>(srcPixmap.addr()), int(srcPixmap.rowBytes()),
format, xFilter.GetSkiaFilter(), xOrYFilter->GetSkiaFilter(),
int(dstStride), dstData);
}
} // namespace mozilla::gfx
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