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/*
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Array.h>
namespace GPU {
// The pixel data's representation
enum class PixelFormat {
Alpha,
BGR,
BGRA,
Blue,
ColorIndex,
DepthComponent,
Green,
Intensity,
Luminance,
LuminanceAlpha,
Red,
RGB,
RGBA,
StencilIndex,
};
// Bit width assigned to individual components within a single pixel's value
enum class PixelComponentBits {
AllBits,
B1_5_5_5,
B2_3_3,
B2_10_10_10,
B3_3_2,
B4_4_4_4,
B5_5_5_1,
B5_6_5,
B8_8_8_8,
B10_10_10_2,
};
// The base data type used as pixel storage
enum class PixelDataType {
Bitmap,
Byte,
Float,
HalfFloat,
Int,
Short,
UnsignedByte,
UnsignedInt,
UnsignedShort,
};
// Order of components within a single pixel
enum class ComponentsOrder {
Normal,
Reversed,
};
struct PixelType final {
PixelFormat format;
PixelComponentBits bits;
PixelDataType data_type;
ComponentsOrder components_order { ComponentsOrder::Normal };
};
static constexpr int number_of_components(PixelFormat format)
{
switch (format) {
case PixelFormat::Alpha:
case PixelFormat::Blue:
case PixelFormat::ColorIndex:
case PixelFormat::DepthComponent:
case PixelFormat::Green:
case PixelFormat::Intensity:
case PixelFormat::Luminance:
case PixelFormat::Red:
case PixelFormat::StencilIndex:
return 1;
case PixelFormat::LuminanceAlpha:
return 2;
case PixelFormat::BGR:
case PixelFormat::RGB:
return 3;
case PixelFormat::BGRA:
case PixelFormat::RGBA:
return 4;
}
VERIFY_NOT_REACHED();
}
static constexpr int number_of_components(PixelComponentBits bits)
{
switch (bits) {
case PixelComponentBits::AllBits:
return 1;
case PixelComponentBits::B2_3_3:
case PixelComponentBits::B3_3_2:
case PixelComponentBits::B5_6_5:
return 3;
case PixelComponentBits::B1_5_5_5:
case PixelComponentBits::B2_10_10_10:
case PixelComponentBits::B4_4_4_4:
case PixelComponentBits::B5_5_5_1:
case PixelComponentBits::B8_8_8_8:
case PixelComponentBits::B10_10_10_2:
return 4;
}
VERIFY_NOT_REACHED();
}
static constexpr Array<u8, 4> pixel_component_bitfield_lengths(PixelComponentBits bits)
{
switch (bits) {
case PixelComponentBits::AllBits:
VERIFY_NOT_REACHED();
case PixelComponentBits::B1_5_5_5:
return { 1, 5, 5, 5 };
case PixelComponentBits::B2_3_3:
return { 2, 3, 3 };
case PixelComponentBits::B2_10_10_10:
return { 2, 10, 10, 10 };
case PixelComponentBits::B3_3_2:
return { 3, 3, 2 };
case PixelComponentBits::B4_4_4_4:
return { 4, 4, 4, 4 };
case PixelComponentBits::B5_5_5_1:
return { 5, 5, 5, 1 };
case PixelComponentBits::B5_6_5:
return { 5, 6, 5 };
case PixelComponentBits::B8_8_8_8:
return { 8, 8, 8, 8 };
case PixelComponentBits::B10_10_10_2:
return { 10, 10, 10, 2 };
}
VERIFY_NOT_REACHED();
}
static constexpr size_t pixel_data_type_size_in_bytes(PixelDataType data_type)
{
switch (data_type) {
case PixelDataType::Bitmap:
return sizeof(u8);
case PixelDataType::Byte:
return sizeof(u8);
case PixelDataType::Float:
return sizeof(float);
case PixelDataType::HalfFloat:
return sizeof(float) / 2;
case PixelDataType::Int:
return sizeof(i32);
case PixelDataType::Short:
return sizeof(i16);
case PixelDataType::UnsignedByte:
return sizeof(u8);
case PixelDataType::UnsignedInt:
return sizeof(u32);
case PixelDataType::UnsignedShort:
return sizeof(u16);
}
VERIFY_NOT_REACHED();
}
static constexpr u8 pixel_size_in_bytes(PixelType pixel_type)
{
auto component_size_in_bytes = pixel_data_type_size_in_bytes(pixel_type.data_type);
if (pixel_type.bits == PixelComponentBits::AllBits)
return component_size_in_bytes * number_of_components(pixel_type.format);
return component_size_in_bytes;
}
}
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