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LibGfx: Fix 24bit BMPs being transparent and send them as RGBx to Skia

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This commit is contained in:
Pavel Shliak 2024-11-03 03:12:14 +04:00 committed by Jelle Raaijmakers
parent ad1ba30b27
commit 1389ae02be
Notes: github-actions[bot] 2024-11-07 11:28:02 +00:00 
Author: https://github.com/shlyakpavel
Commit: https://github.com/LadybirdBrowser/ladybird/commit/1389ae02be9
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2132
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/simonkrauter
7 changed files with 46 additions and 3 deletions
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5
Tests/LibGfx/TestImageDecoder.cpp
View file

@ -59,7 +59,10 @@ TEST_CASE(test_bmp_top_down)
EXPECT(Gfx::BMPImageDecoderPlugin::sniff(file->bytes()));
auto plugin_decoder = TRY_OR_FAIL(Gfx::BMPImageDecoderPlugin::create(file->bytes()));
TRY_OR_FAIL(expect_single_frame(*plugin_decoder));
auto frame = TRY_OR_FAIL(expect_single_frame(*plugin_decoder));
EXPECT_EQ(frame.image->format(), Gfx::BitmapFormat::RGBx8888);
// Compares only rgb data
EXPECT_EQ(frame.image->begin()[0] & 0x00ffffffU, 0x00dcc1b8U);
}
TEST_CASE(test_bmp_1bpp)

1
Userland/Libraries/LibGfx/Bitmap.cpp
View file

@ -37,6 +37,7 @@ size_t Bitmap::minimum_pitch(size_t width, BitmapFormat format)
switch (determine_storage_format(format)) {
case StorageFormat::BGRx8888:
case StorageFormat::BGRA8888:
case StorageFormat::RGBx8888:
case StorageFormat::RGBA8888:
element_size = 4;
break;

17
Userland/Libraries/LibGfx/Bitmap.h
View file

@ -23,6 +23,7 @@ enum class BitmapFormat {
Invalid,
BGRx8888,
BGRA8888,
RGBx8888,
RGBA8888,
};
@ -31,6 +32,7 @@ inline bool is_valid_bitmap_format(unsigned format)
switch (format) {
case (unsigned)BitmapFormat::Invalid:
case (unsigned)BitmapFormat::BGRx8888:
case (unsigned)BitmapFormat::RGBx8888:
case (unsigned)BitmapFormat::BGRA8888:
case (unsigned)BitmapFormat::RGBA8888:
return true;
@ -42,6 +44,7 @@ enum class StorageFormat {
BGRx8888,
BGRA8888,
RGBA8888,
RGBx8888,
};
inline StorageFormat determine_storage_format(BitmapFormat format)
@ -53,6 +56,8 @@ inline StorageFormat determine_storage_format(BitmapFormat format)
return StorageFormat::BGRA8888;
case BitmapFormat::RGBA8888:
return StorageFormat::RGBA8888;
case BitmapFormat::RGBx8888:
return StorageFormat::RGBx8888;
default:
VERIFY_NOT_REACHED();
}
@ -309,6 +314,15 @@ ALWAYS_INLINE void Bitmap::set_pixel<StorageFormat::RGBA8888>(int x, int y, Colo
scanline(y)[x] = rgba;
}
template<>
ALWAYS_INLINE void Bitmap::set_pixel<StorageFormat::RGBx8888>(int x, int y, Color color)
{
VERIFY(x >= 0);
VERIFY(x < width());
auto rgb = (color.blue() << 16) | (color.green() << 8) | color.red();
scanline(y)[x] = rgb;
}
ALWAYS_INLINE void Bitmap::set_pixel(int x, int y, Color color)
{
switch (determine_storage_format(m_format)) {
@ -321,6 +335,9 @@ ALWAYS_INLINE void Bitmap::set_pixel(int x, int y, Color color)
case StorageFormat::RGBA8888:
set_pixel<StorageFormat::RGBA8888>(x, y, color);
break;
case StorageFormat::RGBx8888:
set_pixel<StorageFormat::RGBx8888>(x, y, color);
break;
default:
VERIFY_NOT_REACHED();
}

12
Userland/Libraries/LibGfx/ImageFormats/BMPLoader.cpp
View file

@ -1,6 +1,7 @@
/*
* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
* Copyright (c) 2022, Bruno Conde <brunompconde@gmail.com>
* Copyright (c) 2024, Pavel Shliak <shlyakpavel@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -1256,7 +1257,7 @@ static ErrorOr<void> decode_bmp_pixel_data(BMPLoadingContext& context)
return BitmapFormat::BGRA8888;
return BitmapFormat::BGRx8888;
case 24:
return BitmapFormat::BGRx8888;
return BitmapFormat::RGBx8888;
case 32:
return BitmapFormat::BGRA8888;
default:
@ -1372,7 +1373,14 @@ static ErrorOr<void> decode_bmp_pixel_data(BMPLoadingContext& context)
case 24: {
if (!streamer.has_u24())
return Error::from_string_literal("Cannot read 24 bits");
context.bitmap->scanline(row)[column++] = streamer.read_u24();
u32 pixel = streamer.read_u24();
u8 b = (pixel & 0xFF0000) >> 16;
u8 g = (pixel & 0x00FF00) >> 8;
u8 r = (pixel & 0x0000FF);
u32 rgbx_pixel = (r << 16) | (g << 8) | b;
context.bitmap->scanline(row)[column++] = rgbx_pixel;
break;
}
case 32:

2
Userland/Libraries/LibGfx/PainterSkia.cpp
View file

@ -38,6 +38,8 @@ static SkColorType to_skia_color_type(Gfx::BitmapFormat format)
return kBGRA_8888_SkColorType;
case Gfx::BitmapFormat::RGBA8888:
return kRGBA_8888_SkColorType;
case Gfx::BitmapFormat::RGBx8888:
return kRGB_888x_SkColorType;
default:
return kUnknown_SkColorType;
}

2
Userland/Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp
View file

@ -395,6 +395,8 @@ static SkColorType to_skia_color_type(Gfx::BitmapFormat format)
return kBGRA_8888_SkColorType;
case Gfx::BitmapFormat::RGBA8888:
return kRGBA_8888_SkColorType;
case Gfx::BitmapFormat::RGBx8888:
return kRGB_888x_SkColorType;
default:
return kUnknown_SkColorType;
}

10
Userland/Utilities/image.cpp
View file

@ -88,6 +88,10 @@ static ErrorOr<void> move_alpha_to_rgb(LoadedImage& image)
u8 alpha = pixel >> 24;
pixel = 0xff000000 | (alpha << 16) | (alpha << 8) | alpha;
}
break;
case Gfx::BitmapFormat::RGBx8888:
// This should never be the case, as there's no alpha channel in the image
return Error::from_string_literal("Can't --move-alpha-to-rgb with RGBx8888 bitmaps");
}
return {};
}
@ -108,7 +112,13 @@ static ErrorOr<void> strip_alpha(LoadedImage& image)
return Error::from_string_literal("--strip-alpha not implemented for RGBA8888");
case Gfx::BitmapFormat::BGRA8888:
case Gfx::BitmapFormat::BGRx8888:
// BGRx8888 is sent as BGRA8888 to Skia,
// that's why we need to ensure there's no "alpha channel" left
frame->strip_alpha_channel();
break;
case Gfx::BitmapFormat::RGBx8888:
// This format means there's no alpha channel, so nothing to do here
break;
}
return {};
}