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serenity/Userland/Libraries/LibGfx/DDSLoader.cpp

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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <AK/Endian.h>
#include <AK/LexicalPath.h>
#include <AK/MappedFile.h>
#include <AK/MemoryStream.h>
#include <AK/StringBuilder.h>
#include <AK/Vector.h>
#include <LibGfx/DDSLoader.h>
#include <fcntl.h>
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef __serenity__
# include <serenity.h>
#endif
namespace Gfx {
struct DDSLoadingContext {
enum State {
NotDecoded = 0,
Error,
BitmapDecoded,
};
State state { State::NotDecoded };
const u8* data { nullptr };
size_t data_size { 0 };
DDSHeader header;
DDSHeaderDXT10 header10;
RefPtr<Gfx::Bitmap> bitmap;
void dump_debug();
};
static constexpr u32 create_four_cc(char c0, char c1, char c2, char c3)
{
return c0 | c1 << 8 | c2 << 16 | c3 << 24;
}
static bool is_planar(DXGIFormat format)
{
switch (format) {
case DXGI_FORMAT_NV12:
case DXGI_FORMAT_420_OPAQUE:
case DXGI_FORMAT_P208:
case DXGI_FORMAT_P010:
case DXGI_FORMAT_P016:
return true;
default:
return false;
}
}
static bool is_packed(DXGIFormat format)
{
switch (format) {
case DXGI_FORMAT_R8G8_B8G8_UNORM:
case DXGI_FORMAT_G8R8_G8B8_UNORM:
case DXGI_FORMAT_YUY2:
case DXGI_FORMAT_Y210:
case DXGI_FORMAT_Y216:
return true;
default:
return false;
}
}
static u64 get_width(DDSHeader header, size_t mipmap_level)
{
if (mipmap_level >= header.mip_map_count) {
return header.width;
}
return header.width >> mipmap_level;
}
static u64 get_height(DDSHeader header, size_t mipmap_level)
{
if (mipmap_level >= header.mip_map_count) {
return header.height;
}
return header.height >> mipmap_level;
}
static constexpr bool has_bitmask(DDSPixelFormat format, u32 r, u32 g, u32 b, u32 a)
{
return format.r_bit_mask == r && format.g_bit_mask == g && format.b_bit_mask == b && format.a_bit_mask == a;
}
static DXGIFormat get_format(DDSPixelFormat format)
{
if ((format.flags & PixelFormatFlags::DDPF_RGB) == PixelFormatFlags::DDPF_RGB) {
switch (format.rgb_bit_count) {
case 32: {
if (has_bitmask(format, 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000))
return DXGI_FORMAT_R8G8B8A8_UNORM;
if (has_bitmask(format, 0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000))
return DXGI_FORMAT_B8G8R8A8_UNORM;
if (has_bitmask(format, 0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000))
return DXGI_FORMAT_B8G8R8X8_UNORM;
if (has_bitmask(format, 0x3FF00000, 0x000FFC00, 0x000003FF, 0xC0000000))
return DXGI_FORMAT_R10G10B10A2_UNORM;
if (has_bitmask(format, 0x0000FFFF, 0xFFFF0000, 0x00000000, 0x00000000))
return DXGI_FORMAT_R16G16_UNORM;
if (has_bitmask(format, 0xFFFFFFFF, 0x00000000, 0x00000000, 0x00000000))
return DXGI_FORMAT_R32_FLOAT;
break;
}
case 24:
break;
case 16: {
if (has_bitmask(format, 0x7C00, 0x03E0, 0x001F, 0x8000))
return DXGI_FORMAT_B5G5R5A1_UNORM;
if (has_bitmask(format, 0xF800, 0x07E0, 0x001F, 0x0000))
return DXGI_FORMAT_B5G6R5_UNORM;
if (has_bitmask(format, 0xF800, 0x07E0, 0x001F, 0x0000))
return DXGI_FORMAT_B5G6R5_UNORM;
if (has_bitmask(format, 0x0F00, 0x00F0, 0x000F, 0xF000))
return DXGI_FORMAT_B4G4R4A4_UNORM;
if (has_bitmask(format, 0x00FF, 0x0000, 0x0000, 0xFF00))
return DXGI_FORMAT_R8G8_UNORM;
if (has_bitmask(format, 0xFFFF, 0x0000, 0x0000, 0x0000))
return DXGI_FORMAT_R16_UNORM;
break;
}
case 8: {
if (has_bitmask(format, 0xFF, 0x00, 0x00, 0x00))
return DXGI_FORMAT_R8_UNORM;
break;
}
}
} else if ((format.flags & PixelFormatFlags::DDPF_LUMINANCE) == PixelFormatFlags::DDPF_LUMINANCE) {
switch (format.rgb_bit_count) {
case 16: {
if (has_bitmask(format, 0xFFFF, 0x0000, 0x0000, 0x0000))
return DXGI_FORMAT_R16_UNORM;
if (has_bitmask(format, 0x00FF, 0x0000, 0x0000, 0xFF00))
return DXGI_FORMAT_R8G8_UNORM;
break;
}
case 8: {
if (has_bitmask(format, 0xFF, 0x00, 0x00, 0x00))
return DXGI_FORMAT_R8_UNORM;
// Some writers mistakenly write this as 8 bpp.
if (has_bitmask(format, 0x00FF, 0x0000, 0x0000, 0xFF00))
return DXGI_FORMAT_R8G8_UNORM;
break;
}
}
} else if ((format.flags & PixelFormatFlags::DDPF_ALPHA) == PixelFormatFlags::DDPF_ALPHA) {
if (format.rgb_bit_count == 8)
return DXGI_FORMAT_A8_UNORM;
} else if ((format.flags & PixelFormatFlags::DDPF_BUMPDUDV) == PixelFormatFlags::DDPF_BUMPDUDV) {
switch (format.rgb_bit_count) {
case 32: {
if (has_bitmask(format, 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000))
return DXGI_FORMAT_R8G8B8A8_SNORM;
if (has_bitmask(format, 0x0000FFFF, 0xFFFF0000, 0x00000000, 0x00000000))
return DXGI_FORMAT_R16G16_SNORM;
break;
}
case 16: {
if (has_bitmask(format, 0x00FF, 0xFF00, 0x0000, 0x0000))
return DXGI_FORMAT_R8G8_SNORM;
break;
}
}
} else if ((format.flags & PixelFormatFlags::DDPF_FOURCC) == PixelFormatFlags::DDPF_FOURCC) {
if (format.four_cc == create_four_cc('D', 'X', 'T', '1'))
return DXGI_FORMAT_BC1_UNORM;
if (format.four_cc == create_four_cc('D', 'X', 'T', '2'))
return DXGI_FORMAT_BC2_UNORM;
if (format.four_cc == create_four_cc('D', 'X', 'T', '3'))
return DXGI_FORMAT_BC2_UNORM;
if (format.four_cc == create_four_cc('D', 'X', 'T', '4'))
return DXGI_FORMAT_BC3_UNORM;
if (format.four_cc == create_four_cc('D', 'X', 'T', '5'))
return DXGI_FORMAT_BC3_UNORM;
if (format.four_cc == create_four_cc('A', 'T', 'I', '1'))
return DXGI_FORMAT_BC4_UNORM;
if (format.four_cc == create_four_cc('B', 'C', '4', 'U'))
return DXGI_FORMAT_BC4_UNORM;
if (format.four_cc == create_four_cc('B', 'C', '4', 'S'))
return DXGI_FORMAT_BC4_SNORM;
if (format.four_cc == create_four_cc('A', 'T', 'I', '2'))
return DXGI_FORMAT_BC5_UNORM;
if (format.four_cc == create_four_cc('B', 'C', '5', 'U'))
return DXGI_FORMAT_BC5_UNORM;
if (format.four_cc == create_four_cc('B', 'C', '5', 'S'))
return DXGI_FORMAT_BC5_SNORM;
if (format.four_cc == create_four_cc('R', 'G', 'B', 'G'))
return DXGI_FORMAT_R8G8_B8G8_UNORM;
if (format.four_cc == create_four_cc('G', 'R', 'G', 'B'))
return DXGI_FORMAT_G8R8_G8B8_UNORM;
if (format.four_cc == create_four_cc('Y', 'U', 'Y', '2'))
return DXGI_FORMAT_YUY2;
switch (format.four_cc) {
case 36:
return DXGI_FORMAT_R16G16B16A16_UNORM;
case 110:
return DXGI_FORMAT_R16G16B16A16_SNORM;
case 111:
return DXGI_FORMAT_R16_FLOAT;
case 112:
return DXGI_FORMAT_R16G16_FLOAT;
case 113:
return DXGI_FORMAT_R16G16B16A16_FLOAT;
case 114:
return DXGI_FORMAT_R32_FLOAT;
case 115:
return DXGI_FORMAT_R32G32_FLOAT;
case 116:
return DXGI_FORMAT_R32G32B32A32_FLOAT;
}
}
return DXGI_FORMAT_UNKNOWN;
}
static bool is_block_compressed(DXGIFormat format)
{
switch (format) {
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB:
return true;
default:
return false;
}
}
static size_t block_size(DXGIFormat format)
{
switch (format) {
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB:
return 16;
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
case DXGI_FORMAT_Y210:
case DXGI_FORMAT_Y216:
return 8;
case DXGI_FORMAT_R8G8_B8G8_UNORM:
case DXGI_FORMAT_G8R8_G8B8_UNORM:
case DXGI_FORMAT_YUY2:
case DXGI_FORMAT_P010:
case DXGI_FORMAT_P016:
return 4;
case DXGI_FORMAT_NV12:
case DXGI_FORMAT_420_OPAQUE:
case DXGI_FORMAT_P208:
return 2;
default:
return 0;
}
}
static size_t bits_per_pixel(DXGIFormat format)
{
switch (format) {
case DXGI_FORMAT_R32G32B32A32_TYPELESS:
case DXGI_FORMAT_R32G32B32A32_FLOAT:
case DXGI_FORMAT_R32G32B32A32_UINT:
case DXGI_FORMAT_R32G32B32A32_SINT:
return 128;
case DXGI_FORMAT_R32G32B32_TYPELESS:
case DXGI_FORMAT_R32G32B32_FLOAT:
case DXGI_FORMAT_R32G32B32_UINT:
case DXGI_FORMAT_R32G32B32_SINT:
return 96;
case DXGI_FORMAT_R16G16B16A16_TYPELESS:
case DXGI_FORMAT_R16G16B16A16_FLOAT:
case DXGI_FORMAT_R16G16B16A16_UNORM:
case DXGI_FORMAT_R16G16B16A16_UINT:
case DXGI_FORMAT_R16G16B16A16_SNORM:
case DXGI_FORMAT_R16G16B16A16_SINT:
case DXGI_FORMAT_R32G32_TYPELESS:
case DXGI_FORMAT_R32G32_FLOAT:
case DXGI_FORMAT_R32G32_UINT:
case DXGI_FORMAT_R32G32_SINT:
case DXGI_FORMAT_R32G8X24_TYPELESS:
case DXGI_FORMAT_D32_FLOAT_S8X24_UINT:
case DXGI_FORMAT_R32_FLOAT_X8X24_TYPELESS:
case DXGI_FORMAT_X32_TYPELESS_G8X24_UINT:
case DXGI_FORMAT_Y416:
case DXGI_FORMAT_Y210:
case DXGI_FORMAT_Y216:
return 64;
case DXGI_FORMAT_R10G10B10A2_TYPELESS:
case DXGI_FORMAT_R10G10B10A2_UNORM:
case DXGI_FORMAT_R10G10B10A2_UINT:
case DXGI_FORMAT_R11G11B10_FLOAT:
case DXGI_FORMAT_R8G8B8A8_TYPELESS:
case DXGI_FORMAT_R8G8B8A8_UNORM:
case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
case DXGI_FORMAT_R8G8B8A8_UINT:
case DXGI_FORMAT_R8G8B8A8_SNORM:
case DXGI_FORMAT_R8G8B8A8_SINT:
case DXGI_FORMAT_R16G16_TYPELESS:
case DXGI_FORMAT_R16G16_FLOAT:
case DXGI_FORMAT_R16G16_UNORM:
case DXGI_FORMAT_R16G16_UINT:
case DXGI_FORMAT_R16G16_SNORM:
case DXGI_FORMAT_R16G16_SINT:
case DXGI_FORMAT_R32_TYPELESS:
case DXGI_FORMAT_D32_FLOAT:
case DXGI_FORMAT_R32_FLOAT:
case DXGI_FORMAT_R32_UINT:
case DXGI_FORMAT_R32_SINT:
case DXGI_FORMAT_R24G8_TYPELESS:
case DXGI_FORMAT_D24_UNORM_S8_UINT:
case DXGI_FORMAT_R24_UNORM_X8_TYPELESS:
case DXGI_FORMAT_X24_TYPELESS_G8_UINT:
case DXGI_FORMAT_R9G9B9E5_SHAREDEXP:
case DXGI_FORMAT_R8G8_B8G8_UNORM:
case DXGI_FORMAT_G8R8_G8B8_UNORM:
case DXGI_FORMAT_B8G8R8A8_UNORM:
case DXGI_FORMAT_B8G8R8X8_UNORM:
case DXGI_FORMAT_R10G10B10_XR_BIAS_A2_UNORM:
case DXGI_FORMAT_B8G8R8A8_TYPELESS:
case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
case DXGI_FORMAT_B8G8R8X8_TYPELESS:
case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
case DXGI_FORMAT_AYUV:
case DXGI_FORMAT_Y410:
case DXGI_FORMAT_YUY2:
return 32;
case DXGI_FORMAT_P010:
case DXGI_FORMAT_P016:
case DXGI_FORMAT_V408:
return 24;
case DXGI_FORMAT_R8G8_TYPELESS:
case DXGI_FORMAT_R8G8_UNORM:
case DXGI_FORMAT_R8G8_UINT:
case DXGI_FORMAT_R8G8_SNORM:
case DXGI_FORMAT_R8G8_SINT:
case DXGI_FORMAT_R16_TYPELESS:
case DXGI_FORMAT_R16_FLOAT:
case DXGI_FORMAT_D16_UNORM:
case DXGI_FORMAT_R16_UNORM:
case DXGI_FORMAT_R16_UINT:
case DXGI_FORMAT_R16_SNORM:
case DXGI_FORMAT_R16_SINT:
case DXGI_FORMAT_B5G6R5_UNORM:
case DXGI_FORMAT_B5G5R5A1_UNORM:
case DXGI_FORMAT_A8P8:
case DXGI_FORMAT_B4G4R4A4_UNORM:
case DXGI_FORMAT_P208:
case DXGI_FORMAT_V208:
return 16;
case DXGI_FORMAT_NV12:
case DXGI_FORMAT_420_OPAQUE:
case DXGI_FORMAT_NV11:
return 12;
case DXGI_FORMAT_R8_TYPELESS:
case DXGI_FORMAT_R8_UNORM:
case DXGI_FORMAT_R8_UINT:
case DXGI_FORMAT_R8_SNORM:
case DXGI_FORMAT_R8_SINT:
case DXGI_FORMAT_A8_UNORM:
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB:
case DXGI_FORMAT_AI44:
case DXGI_FORMAT_IA44:
case DXGI_FORMAT_P8:
return 8;
case DXGI_FORMAT_R1_UNORM:
return 1;
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
return 4;
default:
return 0;
}
}
static void decode_dx5_alpha_block(InputMemoryStream& stream, DDSLoadingContext& context, u64 bitmap_x, u64 bitmap_y)
{
LittleEndian<u8> color0 {}, color1 {};
LittleEndian<u8> code0 {}, code1 {}, code2 {}, code3 {}, code4 {}, code5 {};
stream >> color0;
stream >> color1;
stream >> code0;
stream >> code1;
stream >> code2;
stream >> code3;
stream >> code4;
stream >> code5;
u32 codes[6] = { 0 };
codes[0] = code0 + 256 * (code1 + 256);
codes[1] = code1 + 256 * (code2 + 256);
codes[2] = code2 + 256 * (code3 + 256);
codes[3] = code3 + 256 * (code4 + 256);
codes[4] = code4 + 256 * code5;
codes[5] = code5;
u32 color[8] = { 0 };
if (color0 > 128) {
color[0] = color0;
}
if (color1 > 128) {
color[1] = color1;
}
if (color0 > color1) {
color[2] = (6 * color[0] + 1 * color[1]) / 7;
color[3] = (5 * color[0] + 2 * color[1]) / 7;
color[4] = (4 * color[0] + 3 * color[1]) / 7;
color[5] = (3 * color[0] + 4 * color[1]) / 7;
color[6] = (2 * color[0] + 5 * color[1]) / 7;
color[7] = (1 * color[0] + 6 * color[1]) / 7;
} else {
color[2] = (4 * color[0] + 1 * color[1]) / 5;
color[3] = (3 * color[0] + 2 * color[1]) / 5;
color[4] = (2 * color[0] + 3 * color[1]) / 5;
color[5] = (1 * color[0] + 4 * color[1]) / 5;
color[6] = 0;
color[7] = 255;
}
for (size_t y = 0; y < 4; y++) {
for (size_t x = 0; x < 4; x++) {
u8 index = 3 * (4 * y + x);
u8 bit_location = floor(index / 8.0);
u8 adjusted_index = index - (bit_location * 8);
u8 code = (codes[bit_location] >> adjusted_index) & 7;
u8 alpha = color[code];
Color color = Color(0, 0, 0, alpha);
context.bitmap->set_pixel(bitmap_x + x, bitmap_y + y, color);
}
}
}
static void decode_dx3_alpha_block(InputMemoryStream& stream, DDSLoadingContext& context, u64 bitmap_x, u64 bitmap_y)
{
LittleEndian<u8> a0 {}, a1 {}, a2 {}, a3 {}, a4 {}, a5 {}, a6 {}, a7 {};
stream >> a0;
stream >> a1;
stream >> a2;
stream >> a3;
stream >> a4;
stream >> a5;
stream >> a6;
stream >> a7;
u64 alpha_0 = a0 + 256u * (a1 + 256u * (a2 + 256u * (a3 + 256u)));
u64 alpha_1 = a4 + 256u * (a5 + 256u * (a6 + 256u * a7));
for (size_t y = 0; y < 4; y++) {
for (size_t x = 0; x < 4; x++) {
u8 code = 4 * (4 * y + x);
if (code >= 32) {
code = code - 32;
u8 alpha = ((alpha_1 >> code) & 0x0F) * 17;
Color color = Color(0, 0, 0, alpha);
context.bitmap->set_pixel(bitmap_x + x, bitmap_y + y, color);
} else {
u8 alpha = ((alpha_0 >> code) & 0x0F) * 17;
Color color = Color(0, 0, 0, alpha);
context.bitmap->set_pixel(bitmap_x + x, bitmap_y + y, color);
}
}
}
}
static void unpack_rbg_565(u32 rgb, u8* output)
{
u8 r = (rgb >> 11) & 0x1F;
u8 g = (rgb >> 5) & 0x3F;
u8 b = rgb & 0x1F;
output[0] = (r << 3) | (r >> 2);
output[1] = (g << 2) | (g >> 4);
output[2] = (b << 3) | (b >> 2);
output[3] = 255;
}
static void decode_color_block(InputMemoryStream& stream, DDSLoadingContext& context, bool dxt1, u64 bitmap_x, u64 bitmap_y)
{
LittleEndian<u8> c0_low {}, c0_high {}, c1_low {}, c1_high {};
LittleEndian<u8> codes_0 {}, codes_1 {}, codes_2 {}, codes_3 {};
stream >> c0_low;
stream >> c0_high;
stream >> c1_low;
stream >> c1_high;
stream >> codes_0;
stream >> codes_1;
stream >> codes_2;
stream >> codes_3;
u64 code = codes_0 + 256 * (codes_1 + 256 * (codes_2 + 256 * codes_3));
u32 color_0 = c0_low + (c0_high * 256);
u32 color_1 = c1_low + (c1_high * 256);
u8 rgba[4][4];
unpack_rbg_565(color_0, rgba[0]);
unpack_rbg_565(color_1, rgba[1]);
if (color_0 > color_1) {
for (size_t i = 0; i < 3; i++) {
rgba[2][i] = (2 * rgba[0][i] + rgba[1][i]) / 3;
rgba[3][i] = (rgba[0][i] + 2 * rgba[1][i]) / 3;
}
rgba[2][3] = 255;
rgba[3][3] = 255;
} else {
for (size_t i = 0; i < 3; i++) {
rgba[2][i] = (rgba[0][i] + rgba[1][i]) / 2;
rgba[3][i] = 0;
}
rgba[2][3] = 255;
rgba[3][3] = dxt1 ? 0 : 255;
}
size_t i = 0;
for (size_t y = 0; y < 4; y++) {
for (size_t x = 0; x < 4; x++) {
u8 code_byte = (code >> (i * 2)) & 3;
u8 r = rgba[code_byte][0];
u8 g = rgba[code_byte][1];
u8 b = rgba[code_byte][2];
u8 a = dxt1 ? rgba[code_byte][3] : context.bitmap->get_pixel(bitmap_x + x, bitmap_y + y).alpha();
Color color = Color(r, g, b, a);
context.bitmap->set_pixel(bitmap_x + x, bitmap_y + y, color);
i++;
}
}
}
static void decode_dxt(InputMemoryStream& stream, DDSLoadingContext& context, DXGIFormat format, u64 width, u64 y)
{
if (format == DXGI_FORMAT_BC1_UNORM) {
for (size_t x = 0; x < width; x += 4) {
decode_color_block(stream, context, true, x, y);
}
}
if (format == DXGI_FORMAT_BC2_UNORM) {
for (size_t x = 0; x < width; x += 4) {
decode_dx3_alpha_block(stream, context, x, y);
decode_color_block(stream, context, false, x, y);
}
}
if (format == DXGI_FORMAT_BC3_UNORM) {
for (size_t x = 0; x < width; x += 4) {
decode_dx5_alpha_block(stream, context, x, y);
decode_color_block(stream, context, false, x, y);
}
}
}
static void decode_bitmap(InputMemoryStream& stream, DDSLoadingContext& context, DXGIFormat format, u64 width, u64 height)
{
Vector<u32> dxt_formats = { DXGI_FORMAT_BC1_UNORM, DXGI_FORMAT_BC2_UNORM, DXGI_FORMAT_BC3_UNORM };
if (dxt_formats.contains_slow(format)) {
for (u64 y = 0; y < height; y += 4) {
decode_dxt(stream, context, format, width, y);
}
}
// FIXME: Support more encodings (ATI, YUV, RAW, etc...).
}
static size_t get_minimum_bytes_for_mipmap(DXGIFormat format, u64 width, u64 height)
{
u64 row_bytes {};
u64 row_count {};
if (is_block_compressed(format)) {
u64 width_in_blocks {};
u64 height_in_blocks {};
if (width > 0) {
width_in_blocks = max(static_cast<u64>(1), (width + 3u) / 4u);
}
if (height > 0) {
height_in_blocks = max(static_cast<u64>(1), (height + 3u) / 4u);
}
row_bytes = width_in_blocks * block_size(format);
row_count = height_in_blocks;
return row_bytes * row_count;
} else if (is_packed(format)) {
row_bytes = ((width + 1u) >> 1) * block_size(format);
row_count = height;
return row_bytes * row_count;
} else if (format == DXGI_FORMAT_NV11) {
row_bytes = ((width + 3u) >> 2) * 4u;
row_count = height * 2u;
return row_bytes * row_count;
} else if (is_planar(format)) {
row_bytes = ((width + 1u) >> 1) * block_size(format);
row_count = height + ((height + 1u) >> 1);
return (row_bytes * row_count) + (((row_bytes * row_count) + 1) >> 1);
} else {
u32 bpp = bits_per_pixel(format);
row_bytes = (width * bpp + 7u) / 8u;
row_count = height;
return row_bytes * row_count;
}
}
static bool decode_dds(DDSLoadingContext& context)
{
InputMemoryStream stream({ context.data, context.data_size });
// All valid DDS files are at least 128 bytes long.
if (stream.remaining() < 128) {
dbgln_if(DDS_DEBUG, "File is too short for DDS");
context.state = DDSLoadingContext::State::Error;
return false;
}
u32 magic;
stream >> magic;
if (magic != create_four_cc('D', 'D', 'S', ' ')) {
dbgln_if(DDS_DEBUG, "Missing magic number");
context.state = DDSLoadingContext::State::Error;
return false;
}
stream >> context.header.size;
stream >> context.header.flags;
stream >> context.header.height;
stream >> context.header.width;
stream >> context.header.pitch;
stream >> context.header.depth;
stream >> context.header.mip_map_count;
// The bytes in context.header.reserved are unused, so we just skip over them (11 * 4 bytes).
stream.discard_or_error(44);
stream >> context.header.pixel_format.size;
stream >> context.header.pixel_format.flags;
stream >> context.header.pixel_format.four_cc;
stream >> context.header.pixel_format.rgb_bit_count;
stream >> context.header.pixel_format.r_bit_mask;
stream >> context.header.pixel_format.g_bit_mask;
stream >> context.header.pixel_format.b_bit_mask;
stream >> context.header.pixel_format.a_bit_mask;
stream >> context.header.caps1;
stream >> context.header.caps2;
stream >> context.header.caps3;
stream >> context.header.caps4;
stream >> context.header.reserved2;
if (context.header.size != 124) {
dbgln_if(DDS_DEBUG, "Header size is malformed");
context.state = DDSLoadingContext::State::Error;
return false;
}
if (context.header.pixel_format.size != 32) {
dbgln_if(DDS_DEBUG, "Pixel format size is malformed");
context.state = DDSLoadingContext::State::Error;
return false;
}
if ((context.header.pixel_format.flags & PixelFormatFlags::DDPF_FOURCC) == PixelFormatFlags::DDPF_FOURCC) {
if (context.header.pixel_format.four_cc == create_four_cc('D', 'X', '1', '0')) {
if (stream.bytes().size() < 148) {
dbgln_if(DDS_DEBUG, "DX10 header is too short");
context.state = DDSLoadingContext::State::Error;
return false;
}
u32 format {};
stream >> format;
context.header10.format = static_cast<DXGIFormat>(format);
stream >> context.header10.resource_dimension;
stream >> context.header10.misc_flag;
stream >> context.header10.array_size;
stream >> context.header10.misc_flag2;
}
}
if constexpr (DDS_DEBUG) {
context.dump_debug();
}
DXGIFormat format = get_format(context.header.pixel_format);
Vector<u32> supported_formats = { DXGI_FORMAT_BC1_UNORM, DXGI_FORMAT_BC2_UNORM, DXGI_FORMAT_BC3_UNORM };
if (!supported_formats.contains_slow(format)) {
dbgln_if(DDS_DEBUG, "Format of type {} is not supported at the moment", static_cast<u32>(format));
context.state = DDSLoadingContext::State::Error;
return false;
}
// We support parsing mipmaps, but we only care about the largest one :^) (At least for now)
if (size_t mipmap_level = 0; mipmap_level < max(context.header.mip_map_count, 1u)) {
u64 width = get_width(context.header, mipmap_level);
u64 height = get_height(context.header, mipmap_level);
u64 needed_bytes = get_minimum_bytes_for_mipmap(format, width, height);
dbgln_if(DDS_DEBUG, "There are {} bytes remaining, we need {} for mipmap level {} of the image", stream.remaining(), needed_bytes, mipmap_level);
VERIFY(stream.remaining() >= needed_bytes);
context.bitmap = Bitmap::try_create(BitmapFormat::BGRA8888, { width, height });
decode_bitmap(stream, context, format, width, height);
}
context.state = DDSLoadingContext::State::BitmapDecoded;
return true;
}
void DDSLoadingContext::dump_debug()
{
StringBuilder builder;
builder.append("\nDDS:\n");
builder.appendff("\tHeader Size: {}\n", header.size);
builder.append("\tFlags:");
if ((header.flags & DDSFlags::DDSD_CAPS) == DDSFlags::DDSD_CAPS)
builder.append(" DDSD_CAPS");
if ((header.flags & DDSFlags::DDSD_HEIGHT) == DDSFlags::DDSD_HEIGHT)
builder.append(" DDSD_HEIGHT");
if ((header.flags & DDSFlags::DDSD_WIDTH) == DDSFlags::DDSD_WIDTH)
builder.append(" DDSD_WIDTH");
if ((header.flags & DDSFlags::DDSD_PITCH) == DDSFlags::DDSD_PITCH)
builder.append(" DDSD_PITCH");
if ((header.flags & DDSFlags::DDSD_PIXELFORMAT) == DDSFlags::DDSD_PIXELFORMAT)
builder.append(" DDSD_PIXELFORMAT");
if ((header.flags & DDSFlags::DDSD_MIPMAPCOUNT) == DDSFlags::DDSD_MIPMAPCOUNT)
builder.append(" DDSD_MIPMAPCOUNT");
if ((header.flags & DDSFlags::DDSD_LINEARSIZE) == DDSFlags::DDSD_LINEARSIZE)
builder.append(" DDSD_LINEARSIZE");
if ((header.flags & DDSFlags::DDSD_DEPTH) == DDSFlags::DDSD_DEPTH)
builder.append(" DDSD_DEPTH");
builder.append("\n");
builder.appendff("\tHeight: {}\n", header.height);
builder.appendff("\tWidth: {}\n", header.width);
builder.appendff("\tPitch: {}\n", header.pitch);
builder.appendff("\tDepth: {}\n", header.depth);
builder.appendff("\tMipmap Count: {}\n", header.mip_map_count);
builder.append("\tCaps:");
if ((header.caps1 & Caps1Flags::DDSCAPS_COMPLEX) == Caps1Flags::DDSCAPS_COMPLEX)
builder.append(" DDSCAPS_COMPLEX");
if ((header.caps1 & Caps1Flags::DDSCAPS_MIPMAP) == Caps1Flags::DDSCAPS_MIPMAP)
builder.append(" DDSCAPS_MIPMAP");
if ((header.caps1 & Caps1Flags::DDSCAPS_TEXTURE) == Caps1Flags::DDSCAPS_TEXTURE)
builder.append(" DDSCAPS_TEXTURE");
builder.append("\n");
builder.append("\tCaps2:");
if ((header.caps2 & Caps2Flags::DDSCAPS2_CUBEMAP) == Caps2Flags::DDSCAPS2_CUBEMAP)
builder.append(" DDSCAPS2_CUBEMAP");
if ((header.caps2 & Caps2Flags::DDSCAPS2_CUBEMAP_POSITIVEX) == Caps2Flags::DDSCAPS2_CUBEMAP_POSITIVEX)
builder.append(" DDSCAPS2_CUBEMAP_POSITIVEX");
if ((header.caps2 & Caps2Flags::DDSCAPS2_CUBEMAP_NEGATIVEX) == Caps2Flags::DDSCAPS2_CUBEMAP_NEGATIVEX)
builder.append(" DDSCAPS2_CUBEMAP_NEGATIVEX");
if ((header.caps2 & Caps2Flags::DDSCAPS2_CUBEMAP_POSITIVEY) == Caps2Flags::DDSCAPS2_CUBEMAP_POSITIVEY)
builder.append(" DDSCAPS2_CUBEMAP_POSITIVEY");
if ((header.caps2 & Caps2Flags::DDSCAPS2_CUBEMAP_NEGATIVEY) == Caps2Flags::DDSCAPS2_CUBEMAP_NEGATIVEY)
builder.append(" DDSCAPS2_CUBEMAP_NEGATIVEY");
if ((header.caps2 & Caps2Flags::DDSCAPS2_CUBEMAP_POSITIVEZ) == Caps2Flags::DDSCAPS2_CUBEMAP_POSITIVEZ)
builder.append(" DDSCAPS2_CUBEMAP_POSITIVEZ");
if ((header.caps2 & Caps2Flags::DDSCAPS2_CUBEMAP_NEGATIVEZ) == Caps2Flags::DDSCAPS2_CUBEMAP_NEGATIVEZ)
builder.append(" DDSCAPS2_CUBEMAP_NEGATIVEZ");
if ((header.caps2 & Caps2Flags::DDSCAPS2_VOLUME) == Caps2Flags::DDSCAPS2_VOLUME)
builder.append(" DDSCAPS2_VOLUME");
builder.append("\n");
builder.append("Pixel Format:\n");
builder.appendff("\tStruct Size: {}\n", header.pixel_format.size);
builder.append("\tFlags:");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_ALPHAPIXELS) == PixelFormatFlags::DDPF_ALPHAPIXELS)
builder.append(" DDPF_ALPHAPIXELS");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_ALPHA) == PixelFormatFlags::DDPF_ALPHA)
builder.append(" DDPF_ALPHA");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_FOURCC) == PixelFormatFlags::DDPF_FOURCC)
builder.append(" DDPF_FOURCC");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_PALETTEINDEXED8) == PixelFormatFlags::DDPF_PALETTEINDEXED8)
builder.append(" DDPF_PALETTEINDEXED8");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_RGB) == PixelFormatFlags::DDPF_RGB)
builder.append(" DDPF_RGB");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_YUV) == PixelFormatFlags::DDPF_YUV)
builder.append(" DDPF_YUV");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_LUMINANCE) == PixelFormatFlags::DDPF_LUMINANCE)
builder.append(" DDPF_LUMINANCE");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_BUMPDUDV) == PixelFormatFlags::DDPF_BUMPDUDV)
builder.append(" DDPF_BUMPDUDV");
if ((header.pixel_format.flags & PixelFormatFlags::DDPF_NORMAL) == PixelFormatFlags::DDPF_NORMAL)
builder.append(" DDPF_NORMAL");
builder.append("\n");
builder.append("\tFour CC: ");
builder.appendff("{:c}", (header.pixel_format.four_cc >> (8 * 0)) & 0xFF);
builder.appendff("{:c}", (header.pixel_format.four_cc >> (8 * 1)) & 0xFF);
builder.appendff("{:c}", (header.pixel_format.four_cc >> (8 * 2)) & 0xFF);
builder.appendff("{:c}", (header.pixel_format.four_cc >> (8 * 3)) & 0xFF);
builder.append("\n");
builder.appendff("\tRGB Bit Count: {}\n", header.pixel_format.rgb_bit_count);
builder.appendff("\tR Bit Mask: {}\n", header.pixel_format.r_bit_mask);
builder.appendff("\tG Bit Mask: {}\n", header.pixel_format.g_bit_mask);
builder.appendff("\tB Bit Mask: {}\n", header.pixel_format.b_bit_mask);
builder.appendff("\tA Bit Mask: {}\n", header.pixel_format.a_bit_mask);
builder.append("DDS10:\n");
builder.appendff("\tFormat: {}\n", static_cast<u32>(header10.format));
builder.append("\tResource Dimension:");
if ((header10.resource_dimension & ResourceDimensions::DDS_DIMENSION_UNKNOWN) == ResourceDimensions::DDS_DIMENSION_UNKNOWN)
builder.append(" DDS_DIMENSION_UNKNOWN");
if ((header10.resource_dimension & ResourceDimensions::DDS_DIMENSION_BUFFER) == ResourceDimensions::DDS_DIMENSION_BUFFER)
builder.append(" DDS_DIMENSION_BUFFER");
if ((header10.resource_dimension & ResourceDimensions::DDS_DIMENSION_TEXTURE1D) == ResourceDimensions::DDS_DIMENSION_TEXTURE1D)
builder.append(" DDS_DIMENSION_TEXTURE1D");
if ((header10.resource_dimension & ResourceDimensions::DDS_DIMENSION_TEXTURE2D) == ResourceDimensions::DDS_DIMENSION_TEXTURE2D)
builder.append(" DDS_DIMENSION_TEXTURE2D");
if ((header10.resource_dimension & ResourceDimensions::DDS_DIMENSION_TEXTURE3D) == ResourceDimensions::DDS_DIMENSION_TEXTURE3D)
builder.append(" DDS_DIMENSION_TEXTURE3D");
builder.append("\n");
builder.appendff("\tArray Size: {}\n", header10.array_size);
builder.append("\tMisc Flags:");
if ((header10.misc_flag & MiscFlags::DDS_RESOURCE_MISC_TEXTURECUBE) == MiscFlags::DDS_RESOURCE_MISC_TEXTURECUBE)
builder.append(" DDS_RESOURCE_MISC_TEXTURECUBE");
builder.append("\n");
builder.append("\tMisc Flags 2:");
if ((header10.misc_flag2 & Misc2Flags::DDS_ALPHA_MODE_UNKNOWN) == Misc2Flags::DDS_ALPHA_MODE_UNKNOWN)
builder.append(" DDS_ALPHA_MODE_UNKNOWN");
if ((header10.misc_flag2 & Misc2Flags::DDS_ALPHA_MODE_STRAIGHT) == Misc2Flags::DDS_ALPHA_MODE_STRAIGHT)
builder.append(" DDS_ALPHA_MODE_STRAIGHT");
if ((header10.misc_flag2 & Misc2Flags::DDS_ALPHA_MODE_PREMULTIPLIED) == Misc2Flags::DDS_ALPHA_MODE_PREMULTIPLIED)
builder.append(" DDS_ALPHA_MODE_PREMULTIPLIED");
if ((header10.misc_flag2 & Misc2Flags::DDS_ALPHA_MODE_OPAQUE) == Misc2Flags::DDS_ALPHA_MODE_OPAQUE)
builder.append(" DDS_ALPHA_MODE_OPAQUE");
if ((header10.misc_flag2 & Misc2Flags::DDS_ALPHA_MODE_CUSTOM) == Misc2Flags::DDS_ALPHA_MODE_CUSTOM)
builder.append(" DDS_ALPHA_MODE_CUSTOM");
builder.append("\n");
dbgln("{}", builder.to_string());
}
static RefPtr<Gfx::Bitmap> load_dds_impl(const u8* data, size_t length)
{
DDSLoadingContext context;
context.data = data;
context.data_size = length;
if (!decode_dds(context))
return nullptr;
return context.bitmap;
}
RefPtr<Gfx::Bitmap> load_dds(String const& path)
{
auto file_or_error = MappedFile::map(path);
if (file_or_error.is_error())
return nullptr;
return load_dds_from_memory((u8 const*)file_or_error.value()->data(), file_or_error.value()->size(), LexicalPath::canonicalized_path(path));
}
RefPtr<Gfx::Bitmap> load_dds_from_memory(u8 const* data, size_t length, String const& mmap_name)
{
auto bitmap = load_dds_impl(data, length);
if (bitmap)
bitmap->set_mmap_name(String::formatted("Gfx::Bitmap [{}] - Decoded DDS: {}", bitmap->size(), mmap_name));
return bitmap;
}
DDSImageDecoderPlugin::DDSImageDecoderPlugin(const u8* data, size_t size)
{
m_context = make<DDSLoadingContext>();
m_context->data = data;
m_context->data_size = size;
}
DDSImageDecoderPlugin::~DDSImageDecoderPlugin()
{
}
IntSize DDSImageDecoderPlugin::size()
{
if (m_context->state == DDSLoadingContext::State::Error)
return {};
if (m_context->state == DDSLoadingContext::State::BitmapDecoded)
return { m_context->header.width, m_context->header.height };
return {};
}
RefPtr<Gfx::Bitmap> DDSImageDecoderPlugin::bitmap()
{
if (m_context->state == DDSLoadingContext::State::Error)
return nullptr;
if (m_context->state < DDSLoadingContext::State::BitmapDecoded) {
bool success = decode_dds(*m_context);
if (!success)
return nullptr;
}
VERIFY(m_context->bitmap);
return m_context->bitmap;
}
void DDSImageDecoderPlugin::set_volatile()
{
if (m_context->bitmap)
m_context->bitmap->set_volatile();
}
bool DDSImageDecoderPlugin::set_nonvolatile(bool& was_purged)
{
if (!m_context->bitmap)
return false;
return m_context->bitmap->set_nonvolatile(was_purged);
}
bool DDSImageDecoderPlugin::sniff()
{
// The header is always at least 128 bytes, so if the file is smaller, it can't be a DDS.
return m_context->data_size > 128
&& m_context->data[0] == 0x44
&& m_context->data[1] == 0x44
&& m_context->data[2] == 0x53
&& m_context->data[3] == 0x20;
}
bool DDSImageDecoderPlugin::is_animated()
{
return false;
}
size_t DDSImageDecoderPlugin::loop_count()
{
return 0;
}
size_t DDSImageDecoderPlugin::frame_count()
{
return 1;
}
ImageFrameDescriptor DDSImageDecoderPlugin::frame(size_t i)
{
if (i > 0)
return {};
return { bitmap(), 0 };
}
}
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