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/*
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibGfx/Vector4.h>
namespace SoftGPU {
enum class ImageFormat {
RGB565,
RGB888,
BGR888,
RGBA8888,
BGRA8888,
L8,
L8A8,
};
static constexpr size_t element_size(ImageFormat format)
{
switch (format) {
case ImageFormat::L8:
return 1;
case ImageFormat::RGB565:
case ImageFormat::L8A8:
return 2;
case ImageFormat::RGB888:
case ImageFormat::BGR888:
return 3;
case ImageFormat::RGBA8888:
case ImageFormat::BGRA8888:
return 4;
default:
VERIFY_NOT_REACHED();
}
}
inline static FloatVector4 unpack_color(void const* ptr, ImageFormat format)
{
constexpr auto one_over_255 = 1.0f / 255;
switch (format) {
case ImageFormat::RGB888: {
auto rgb = reinterpret_cast<u8 const*>(ptr);
return {
rgb[0] * one_over_255,
rgb[1] * one_over_255,
rgb[2] * one_over_255,
1.0f,
};
}
case ImageFormat::BGR888: {
auto bgr = reinterpret_cast<u8 const*>(ptr);
return {
bgr[2] * one_over_255,
bgr[1] * one_over_255,
bgr[0] * one_over_255,
1.0f,
};
}
case ImageFormat::RGBA8888: {
auto rgba = *reinterpret_cast<u32 const*>(ptr);
return {
(rgba & 0xff) * one_over_255,
((rgba >> 8) & 0xff) * one_over_255,
((rgba >> 16) & 0xff) * one_over_255,
((rgba >> 24) & 0xff) * one_over_255,
};
}
case ImageFormat::BGRA8888: {
auto bgra = *reinterpret_cast<u32 const*>(ptr);
return {
((bgra >> 16) & 0xff) * one_over_255,
((bgra >> 8) & 0xff) * one_over_255,
(bgra & 0xff) * one_over_255,
((bgra >> 24) & 0xff) * one_over_255,
};
}
case ImageFormat::RGB565: {
auto rgb = *reinterpret_cast<u16 const*>(ptr);
return {
((rgb >> 11) & 0x1f) / 31.f,
((rgb >> 5) & 0x3f) / 63.f,
(rgb & 0x1f) / 31.f,
1.0f
};
}
case ImageFormat::L8: {
auto luminance = *reinterpret_cast<u8 const*>(ptr);
auto clamped_luminance = luminance * one_over_255;
return {
clamped_luminance,
clamped_luminance,
clamped_luminance,
1.0f,
};
}
case ImageFormat::L8A8: {
auto luminance_and_alpha = reinterpret_cast<u8 const*>(ptr);
auto clamped_luminance = luminance_and_alpha[0] * one_over_255;
return {
clamped_luminance,
clamped_luminance,
clamped_luminance,
luminance_and_alpha[1] * one_over_255,
};
}
default:
VERIFY_NOT_REACHED();
}
}
inline static void pack_color(FloatVector4 const& color, void* ptr, ImageFormat format)
{
auto r = static_cast<u8>(clamp(color.x(), 0.0f, 1.0f) * 255);
auto g = static_cast<u8>(clamp(color.y(), 0.0f, 1.0f) * 255);
auto b = static_cast<u8>(clamp(color.z(), 0.0f, 1.0f) * 255);
auto a = static_cast<u8>(clamp(color.w(), 0.0f, 1.0f) * 255);
switch (format) {
case ImageFormat::RGB888:
reinterpret_cast<u8*>(ptr)[0] = r;
reinterpret_cast<u8*>(ptr)[1] = g;
reinterpret_cast<u8*>(ptr)[2] = b;
return;
case ImageFormat::BGR888:
reinterpret_cast<u8*>(ptr)[2] = b;
reinterpret_cast<u8*>(ptr)[1] = g;
reinterpret_cast<u8*>(ptr)[0] = r;
return;
case ImageFormat::RGBA8888:
*reinterpret_cast<u32*>(ptr) = r | (g << 8) | (b << 16) | (a << 24);
return;
case ImageFormat::BGRA8888:
*reinterpret_cast<u32*>(ptr) = b | (g << 8) | (r << 16) | (a << 24);
return;
case ImageFormat::RGB565:
*reinterpret_cast<u16*>(ptr) = (r & 0x1f) | ((g & 0x3f) << 5) | ((b & 0x1f) << 11);
return;
case ImageFormat::L8:
*reinterpret_cast<u8*>(ptr) = r;
return;
case ImageFormat::L8A8:
reinterpret_cast<u8*>(ptr)[0] = r;
reinterpret_cast<u8*>(ptr)[1] = a;
return;
default:
VERIFY_NOT_REACHED();
}
}
}
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