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void-packages/srcpkgs/webkit2gtk/patches/be-imagebufferbackend.patch

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From 1e7d7e7361189d40ace22d6ff2e2139a4e6759f0 Mon Sep 17 00:00:00 2001
From: q66 <daniel@octaforge.org>
Date: Sat, 31 Jul 2021 22:31:52 +0200
Subject: [PATCH 2/2] some big endian rendering fixes
Source: Jacek Piszczek <jacek.piszczek@runbox.com>
---
.../platform/graphics/ImageBufferBackend.cpp | 109 ++++++++++++++++++
.../platform/graphics/ImageBufferBackend.h | 3 +
2 files changed, 112 insertions(+)
diff --git a/Source/WebCore/platform/graphics/ImageBufferBackend.cpp b/Source/WebCore/platform/graphics/ImageBufferBackend.cpp
index 9394e7bf..e704be6b 100644
--- a/Source/WebCore/platform/graphics/ImageBufferBackend.cpp
+++ b/Source/WebCore/platform/graphics/ImageBufferBackend.cpp
@@ -110,7 +110,11 @@ Vector<uint8_t> ImageBufferBackend::toBGRAData(void* data) const
static inline void copyPremultipliedToPremultiplied(PixelFormat srcPixelFormat, const uint8_t* srcPixel, PixelFormat destPixelFormat, uint8_t* destPixel)
{
+#if CPU(BIG_ENDIAN)
+ uint8_t alpha = srcPixel[srcPixelFormat == PixelFormat::ARGB8 ? 0 : 3];
+#else
uint8_t alpha = srcPixel[3];
+#endif
if (!alpha) {
reinterpret_cast<uint32_t*>(destPixel)[0] = 0;
return;
@@ -121,21 +125,73 @@ static inline void copyPremultipliedToPremultiplied(PixelFormat srcPixelFormat,
return;
}
+#if CPU(BIG_ENDIAN)
+ // Swap pixel channels ARGB <-> RGBA.
+ if (destPixelFormat == PixelFormat::ARGB8)
+ {
+ destPixel[0] = srcPixel[3];
+ destPixel[1] = srcPixel[0];
+ destPixel[2] = srcPixel[1];
+ destPixel[3] = srcPixel[2];
+ }
+ else
+ {
+ destPixel[0] = srcPixel[1];
+ destPixel[1] = srcPixel[2];
+ destPixel[2] = srcPixel[3];
+ destPixel[3] = srcPixel[0];
+ }
+#else
// Swap pixel channels BGRA <-> RGBA.
destPixel[0] = srcPixel[2];
destPixel[1] = srcPixel[1];
destPixel[2] = srcPixel[0];
destPixel[3] = srcPixel[3];
+#endif
}
static inline void copyPremultipliedToUnpremultiplied(PixelFormat srcPixelFormat, const uint8_t* srcPixel, PixelFormat destPixelFormat, uint8_t* destPixel)
{
+#if CPU(BIG_ENDIAN)
+ uint8_t alpha = srcPixel[srcPixelFormat == PixelFormat::ARGB8 ? 0 : 3];
+#else
uint8_t alpha = srcPixel[3];
+#endif
+
if (!alpha || alpha == 255) {
copyPremultipliedToPremultiplied(srcPixelFormat, srcPixel, destPixelFormat, destPixel);
return;
}
+#if CPU(BIG_ENDIAN)
+ if (srcPixelFormat == destPixelFormat) {
+ if (srcPixelFormat == PixelFormat::ARGB8) {
+ destPixel[0] = alpha;
+ destPixel[1] = (srcPixel[1] * 255) / alpha;
+ destPixel[2] = (srcPixel[2] * 255) / alpha;
+ destPixel[3] = (srcPixel[3] * 255) / alpha;
+ return;
+ }
+ destPixel[0] = (srcPixel[0] * 255) / alpha;
+ destPixel[1] = (srcPixel[1] * 255) / alpha;
+ destPixel[2] = (srcPixel[2] * 255) / alpha;
+ destPixel[3] = alpha;
+ return;
+ }
+
+ if (srcPixelFormat == PixelFormat::ARGB8) {
+ destPixel[0] = (srcPixel[1] * 255) / alpha;
+ destPixel[1] = (srcPixel[2] * 255) / alpha;
+ destPixel[2] = (srcPixel[3] * 255) / alpha;
+ destPixel[3] = alpha;
+ }
+ else {
+ destPixel[0] = alpha;
+ destPixel[1] = (srcPixel[0] * 255) / alpha;
+ destPixel[2] = (srcPixel[1] * 255) / alpha;
+ destPixel[3] = (srcPixel[2] * 255) / alpha;
+ }
+#else
if (srcPixelFormat == destPixelFormat) {
destPixel[0] = (srcPixel[0] * 255) / alpha;
destPixel[1] = (srcPixel[1] * 255) / alpha;
@@ -149,16 +205,51 @@ static inline void copyPremultipliedToUnpremultiplied(PixelFormat srcPixelFormat
destPixel[1] = (srcPixel[1] * 255) / alpha;
destPixel[2] = (srcPixel[0] * 255) / alpha;
destPixel[3] = alpha;
+#endif
}
static inline void copyUnpremultipliedToPremultiplied(PixelFormat srcPixelFormat, const uint8_t* srcPixel, PixelFormat destPixelFormat, uint8_t* destPixel)
{
+#if CPU(BIG_ENDIAN)
+ uint8_t alpha = srcPixel[srcPixelFormat == PixelFormat::ARGB8 ? 0 : 3];
+#else
uint8_t alpha = srcPixel[3];
+#endif
+
if (!alpha || alpha == 255) {
copyPremultipliedToPremultiplied(srcPixelFormat, srcPixel, destPixelFormat, destPixel);
return;
}
+#if CPU(BIG_ENDIAN)
+ if (srcPixelFormat == destPixelFormat) {
+ if (srcPixelFormat == PixelFormat::ARGB8) {
+ destPixel[0] = alpha;
+ destPixel[1] = (srcPixel[1] * alpha + 254) / 255;
+ destPixel[2] = (srcPixel[2] * alpha + 254) / 255;
+ destPixel[3] = (srcPixel[3] * alpha + 254) / 255;
+ return;
+ }
+ destPixel[0] = (srcPixel[0] * alpha + 254) / 255;
+ destPixel[1] = (srcPixel[1] * alpha + 254) / 255;
+ destPixel[2] = (srcPixel[2] * alpha + 254) / 255;
+ destPixel[3] = alpha;
+ return;
+ }
+
+ if (srcPixelFormat == PixelFormat::ARGB8) {
+ destPixel[0] = (srcPixel[1] * alpha + 254) / 255;
+ destPixel[1] = (srcPixel[2] * alpha + 254) / 255;
+ destPixel[2] = (srcPixel[3] * alpha + 254) / 255;
+ destPixel[3] = alpha;
+ return;
+ }
+
+ destPixel[0] = alpha;
+ destPixel[1] = (srcPixel[0] * alpha + 254) / 255;
+ destPixel[2] = (srcPixel[1] * alpha + 254) / 255;
+ destPixel[3] = (srcPixel[2] * alpha + 254) / 255;
+#else
if (srcPixelFormat == destPixelFormat) {
destPixel[0] = (srcPixel[0] * alpha + 254) / 255;
destPixel[1] = (srcPixel[1] * alpha + 254) / 255;
@@ -172,6 +263,7 @@ static inline void copyUnpremultipliedToPremultiplied(PixelFormat srcPixelFormat
destPixel[1] = (srcPixel[1] * alpha + 254) / 255;
destPixel[2] = (srcPixel[0] * alpha + 254) / 255;
destPixel[3] = alpha;
+#endif
}
static inline void copyUnpremultipliedToUnpremultiplied(PixelFormat srcPixelFormat, const uint8_t* srcPixel, PixelFormat destPixelFormat, uint8_t* destPixel)
@@ -181,11 +273,27 @@ static inline void copyUnpremultipliedToUnpremultiplied(PixelFormat srcPixelForm
return;
}
+#if CPU(BIG_ENDIAN)
+ // Swap pixel channels ARGB <-> RGBA.
+ if (destPixelFormat == PixelFormat::ARGB8) {
+ destPixel[0] = srcPixel[3];
+ destPixel[1] = srcPixel[0];
+ destPixel[2] = srcPixel[1];
+ destPixel[3] = srcPixel[2];
+ }
+ else {
+ destPixel[0] = srcPixel[1];
+ destPixel[1] = srcPixel[2];
+ destPixel[2] = srcPixel[3];
+ destPixel[3] = srcPixel[0];
+ }
+#else
// Swap pixel channels BGRA <-> RGBA.
destPixel[0] = srcPixel[2];
destPixel[1] = srcPixel[1];
destPixel[2] = srcPixel[0];
destPixel[3] = srcPixel[3];
+#endif
}
template<void (*copyFunctor)(PixelFormat, const uint8_t*, PixelFormat, uint8_t*)>
@@ -207,6 +315,7 @@ void ImageBufferBackend::copyImagePixels(
AlphaPremultiplication destAlphaFormat, PixelFormat destPixelFormat, unsigned destBytesPerRow, uint8_t* destRows, const IntSize& size) const
{
// We don't currently support getting or putting pixel data with deep color buffers.
+ // BGRA8 is actually ARGB8 on BIG_ENDIAN.
ASSERT(srcPixelFormat == PixelFormat::RGBA8 || srcPixelFormat == PixelFormat::BGRA8);
ASSERT(destPixelFormat == PixelFormat::RGBA8 || destPixelFormat == PixelFormat::BGRA8);
diff --git a/Source/WebCore/platform/graphics/ImageBufferBackend.h b/Source/WebCore/platform/graphics/ImageBufferBackend.h
index 31ce9775..4c52fa52 100644
--- a/Source/WebCore/platform/graphics/ImageBufferBackend.h
+++ b/Source/WebCore/platform/graphics/ImageBufferBackend.h
@@ -58,6 +58,9 @@ enum class PreserveResolution : uint8_t {
enum class PixelFormat : uint8_t {
RGBA8,
BGRA8,
+#if CPU(BIG_ENDIAN)
+ ARGB8 = BGRA8, // BGRA will actually be ARGB on BIG_ENDIAN
+#endif
RGB10,
RGB10A8,
};
--
2.31.1
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