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bcdec: Fix decompresssing mipmaps not divisible by 4

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This commit is contained in:
BlueCube3310 2024-11-07 11:42:39 +01:00
parent 87318a2fb7
commit ca7ad58236
1 changed files with 87 additions and 26 deletions
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63
modules/bcdec/image_decompress_bcdec.cpp
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@ -47,7 +47,6 @@ inline void bcdec_bc6h_half_u(const void *compressedBlock, void *decompressedBlo
static void decompress_image(BCdecFormat format, const void *src, void *dst, const uint64_t width, const uint64_t height) {
const uint8_t *src_blocks = reinterpret_cast<const uint8_t *>(src);
uint8_t *dec_blocks = reinterpret_cast<uint8_t *>(dst);
uint64_t src_pos = 0, dst_pos = 0;
#define DECOMPRESS_LOOP(func, block_size, color_bytesize, color_components) \
for (uint64_t y = 0; y < height; y += 4) { \
@ -59,6 +58,66 @@ static void decompress_image(BCdecFormat format, const void *src, void *dst, con
dst_pos += 3 * width * color_bytesize; \
}
#define DECOMPRESS_LOOP_SAFE(func, block_size, color_bytesize, color_components, output) \
for (uint64_t y = 0; y < height; y += 4) { \
for (uint64_t x = 0; x < width; x += 4) { \
const uint32_t yblock = MIN(height - y, 4ul); \
const uint32_t xblock = MIN(width - x, 4ul); \
\
const bool incomplete = yblock < 4 && xblock < 4; \
uint8_t *dec_out = incomplete ? output : &dec_blocks[y * 4 * width + x * color_bytesize]; \
\
func(&src_blocks[src_pos], dec_out, 4 * color_components); \
src_pos += block_size; \
\
if (incomplete) { \
for (uint32_t cy = 0; cy < yblock; cy++) { \
for (uint32_t cx = 0; cx < xblock; cx++) { \
memcpy(&dec_blocks[(y + cy) * 4 * width + (x + cx) * color_bytesize], &output[cy * 4 + cx * color_bytesize], color_bytesize); \
} \
} \
} \
} \
}
if (width % 4 != 0 || height % 4 != 0) {
uint64_t src_pos = 0;
uint8_t r8_output[4 * 4];
uint8_t rg8_output[4 * 4 * 2];
uint8_t rgba8_output[4 * 4 * 4];
uint8_t rgbh_output[4 * 4 * 6];
switch (format) {
case BCdec_BC1: {
DECOMPRESS_LOOP_SAFE(bcdec_bc1, BCDEC_BC1_BLOCK_SIZE, 4, 4, rgba8_output)
} break;
case BCdec_BC2: {
DECOMPRESS_LOOP_SAFE(bcdec_bc2, BCDEC_BC2_BLOCK_SIZE, 4, 4, rgba8_output)
} break;
case BCdec_BC3: {
DECOMPRESS_LOOP_SAFE(bcdec_bc3, BCDEC_BC3_BLOCK_SIZE, 4, 4, rgba8_output)
} break;
case BCdec_BC4: {
DECOMPRESS_LOOP_SAFE(bcdec_bc4, BCDEC_BC4_BLOCK_SIZE, 1, 1, r8_output)
} break;
case BCdec_BC5: {
DECOMPRESS_LOOP_SAFE(bcdec_bc5, BCDEC_BC5_BLOCK_SIZE, 2, 2, rg8_output)
} break;
case BCdec_BC6U: {
DECOMPRESS_LOOP_SAFE(bcdec_bc6h_half_u, BCDEC_BC6H_BLOCK_SIZE, 6, 3, rgbh_output)
} break;
case BCdec_BC6S: {
DECOMPRESS_LOOP_SAFE(bcdec_bc6h_half_s, BCDEC_BC6H_BLOCK_SIZE, 6, 3, rgbh_output)
} break;
case BCdec_BC7: {
DECOMPRESS_LOOP_SAFE(bcdec_bc7, BCDEC_BC7_BLOCK_SIZE, 4, 4, rgba8_output)
} break;
}
} else {
uint64_t src_pos = 0, dst_pos = 0;
switch (format) {
case BCdec_BC1: {
DECOMPRESS_LOOP(bcdec_bc1, BCDEC_BC1_BLOCK_SIZE, 4, 4)
@ -85,8 +144,10 @@ static void decompress_image(BCdecFormat format, const void *src, void *dst, con
DECOMPRESS_LOOP(bcdec_bc7, BCDEC_BC7_BLOCK_SIZE, 4, 4)
} break;
}
}
#undef DECOMPRESS_LOOP
#undef DECOMPRESS_LOOP_SAFE
}
void image_decompress_bcdec(Image *p_image) {