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# HG changeset patch
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# Parent 36563351309ddbc6c29559ba50a41d005f925abb
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Skia does not support big endian. The places to fix are too numerous and upstream (skia, not Mozilla)
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has no interest in maintaining big endian.
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So here we try to swizzle the input for skia, so that skia always works on LE, and when it comes
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out again, we transform back to BE.
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diff -r 36563351309d gfx/2d/ConvolutionFilter.cpp
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--- a/gfx/2d/ConvolutionFilter.cpp Mon Sep 09 17:59:28 2019 +0200
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+++ b/gfx/2d/ConvolutionFilter.cpp Tue Sep 10 08:25:13 2019 +0200
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@@ -35,9 +35,38 @@
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return true;
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}
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+static void ByteSwapArray(uint8_t *u8Array, int32_t size) {
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+ uint32_t *array = reinterpret_cast<uint32_t*>(u8Array);
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+ for (int pxl = 0; pxl < size; ++pxl) {
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+ // Use an endian swap to move the bytes, i.e. BGRA -> ARGB.
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+ uint32_t rgba = array[pxl];
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+ array[pxl] = NativeEndian::swapToLittleEndian(rgba);
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+ }
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+}
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+
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void ConvolutionFilter::ConvolveHorizontally(const uint8_t* aSrc, uint8_t* aDst,
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bool aHasAlpha) {
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+#if MOZ_BIG_ENDIAN
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+ int outputSize = mFilter->numValues();
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+
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+ // Input size isn't handed in, so we have to calculate it quickly
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+ int inputSize = 0;
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+ for (int xx = 0; xx < outputSize; ++xx) {
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+ // Get the filter that determines the current output pixel.
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+ int filterOffset, filterLength;
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+ mFilter->FilterForValue(xx, &filterOffset, &filterLength);
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+ inputSize = std::max(inputSize, filterOffset + filterLength);
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+ }
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+
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+ ByteSwapArray((uint8_t*)aSrc, inputSize);
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+#endif
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+
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SkOpts::convolve_horizontally(aSrc, *mFilter, aDst, aHasAlpha);
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+
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+#if MOZ_BIG_ENDIAN
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+ ByteSwapArray((uint8_t*)aSrc, inputSize);
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+ ByteSwapArray(aDst, outputSize);
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+#endif
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}
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void ConvolutionFilter::ConvolveVertically(uint8_t* const* aSrc, uint8_t* aDst,
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@@ -49,8 +78,26 @@
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int32_t filterLength;
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auto filterValues =
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mFilter->FilterForValue(aRowIndex, &filterOffset, &filterLength);
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+
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+#if MOZ_BIG_ENDIAN
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+ for (int filterY = 0; filterY < filterLength; filterY++) {
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+ // Skia only knows LE, so we have to swizzle the input
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+ ByteSwapArray(aSrc[filterY], aRowSize);
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+ }
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+#endif
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+
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SkOpts::convolve_vertically(filterValues, filterLength, aSrc, aRowSize, aDst,
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aHasAlpha);
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+
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+#if MOZ_BIG_ENDIAN
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+ // After skia is finished, we swizzle back to BE, in case
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+ // the input is used again somewhere else
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+ for (int filterY = 0; filterY < filterLength; filterY++) {
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+ ByteSwapArray(aSrc[filterY], aRowSize);
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+ }
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+ // The destination array as well
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+ ByteSwapArray(aDst, aRowSize);
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+#endif
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}
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/* ConvolutionFilter::ComputeResizeFactor is derived from Skia's
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diff -r 36563351309d gfx/skia/skia/include/core/SkPreConfig.h
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--- a/gfx/skia/skia/include/core/SkPreConfig.h Mon Sep 09 17:59:28 2019 +0200
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+++ b/gfx/skia/skia/include/core/SkPreConfig.h Tue Sep 10 08:25:13 2019 +0200
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@@ -73,7 +73,7 @@
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defined(__ppc__) || defined(__hppa) || \
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defined(__PPC__) || defined(__PPC64__) || \
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defined(_MIPSEB) || defined(__ARMEB__) || \
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- defined(__s390__) || \
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+ defined(__s390__) || defined(__s390x__) || \
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(defined(__sh__) && defined(__BIG_ENDIAN__)) || \
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(defined(__ia64) && defined(__BIG_ENDIAN__))
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#define SK_CPU_BENDIAN
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