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LibWeb: Use Accelerate framework on macOS to premultiply bitmap data

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This leverages hardware acceleration to speed things up considerably,
shaving ~500ms of load time off of https://cloudflare.com/
This commit is contained in:
Andreas Kling 2025-08-20 22:01:30 +02:00 • committed by Jelle Raaijmakers
commit 4350bccf8e
Notes: github-actions[bot] 2025-08-23 12:10:18 +00:00
2 changed files with 40 additions and 2 deletions
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41
Libraries/LibGfx/Bitmap.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2024, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2018-2025, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2022, Timothy Slater <tslater2006@gmail.com>
* Copyright (c) 2024, Jelle Raaijmakers <jelle@ladybird.org>
*
@ -12,6 +12,10 @@
#include <LibGfx/ShareableBitmap.h>
#include <errno.h>
#ifdef AK_OS_MACOS
# include <Accelerate/Accelerate.h>
#endif
namespace Gfx {
struct BackingStore {
@ -280,6 +284,39 @@ void Bitmap::set_alpha_type_destructive(AlphaType alpha_type)
if (alpha_type == m_alpha_type)
return;
#ifdef AK_OS_MACOS
vImage_Buffer buf { .data = m_data, .height = vImagePixelCount(height()), .width = vImagePixelCount(width()), .rowBytes = pitch() };
vImage_Error err;
if (m_alpha_type == AlphaType::Unpremultiplied) {
switch (m_format) {
case BitmapFormat::BGRA8888:
case BitmapFormat::BGRx8888:
err = vImagePremultiplyData_BGRA8888(&buf, &buf, kvImageNoFlags);
break;
case BitmapFormat::RGBA8888:
case BitmapFormat::RGBx8888:
err = vImagePremultiplyData_RGBA8888(&buf, &buf, kvImageNoFlags);
break;
default:
VERIFY_NOT_REACHED();
}
} else {
switch (m_format) {
case BitmapFormat::BGRA8888:
case BitmapFormat::BGRx8888:
err = vImageUnpremultiplyData_BGRA8888(&buf, &buf, kvImageNoFlags);
break;
case BitmapFormat::RGBA8888:
case BitmapFormat::RGBx8888:
err = vImageUnpremultiplyData_RGBA8888(&buf, &buf, kvImageNoFlags);
break;
default:
VERIFY_NOT_REACHED();
}
}
VERIFY(err == kvImageNoError);
#else
// FIXME: Make this fast on other platforms too.
if (m_alpha_type == AlphaType::Unpremultiplied) {
for (auto y = 0; y < height(); ++y) {
for (auto x = 0; x < width(); ++x)
@ -293,7 +330,7 @@ void Bitmap::set_alpha_type_destructive(AlphaType alpha_type)
} else {
VERIFY_NOT_REACHED();
}
#endif
m_alpha_type = alpha_type;
}

1
Libraries/LibGfx/CMakeLists.txt
View file

@ -168,6 +168,7 @@ endif()
if (APPLE)
target_link_libraries(LibCore PUBLIC "-framework Metal")
target_link_libraries(LibCore PUBLIC "-framework Accelerate")
endif()
if (HAS_VULKAN)