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support tRNS chunks in palettized images

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This commit is contained in:
Andre Leiradella 2016-05-29 01:03:44 -03:00
parent d39d925c1d
commit d9ea20727c
1 changed files with 38 additions and 1 deletions
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39
libretro-common/formats/png/rpng.c
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@ -61,6 +61,7 @@ enum png_chunk_type
PNG_CHUNK_IHDR, PNG_CHUNK_IHDR,
PNG_CHUNK_IDAT, PNG_CHUNK_IDAT,
PNG_CHUNK_PLTE, PNG_CHUNK_PLTE,
PNG_CHUNK_tRNS,
PNG_CHUNK_IEND PNG_CHUNK_IEND
}; };
@ -121,6 +122,7 @@ struct rpng
bool has_idat; bool has_idat;
bool has_iend; bool has_iend;
bool has_plte; bool has_plte;
bool has_trns;
struct idat_buffer idat_buf; struct idat_buffer idat_buf;
struct png_ihdr ihdr; struct png_ihdr ihdr;
uint8_t *buff_data; uint8_t *buff_data;
@ -144,6 +146,7 @@ static enum png_chunk_type png_chunk_type(const struct png_chunk *chunk)
{ "IDAT", PNG_CHUNK_IDAT }, { "IDAT", PNG_CHUNK_IDAT },
{ "IEND", PNG_CHUNK_IEND }, { "IEND", PNG_CHUNK_IEND },
{ "PLTE", PNG_CHUNK_PLTE }, { "PLTE", PNG_CHUNK_PLTE },
{ "tRNS", PNG_CHUNK_tRNS },
}; };
for (i = 0; i < ARRAY_SIZE(chunk_map); i++) for (i = 0; i < ARRAY_SIZE(chunk_map); i++)
@ -754,6 +757,18 @@ static bool png_read_plte(uint8_t *buf,
return true; return true;
} }
static bool png_read_trns(uint8_t *buf, uint32_t *palette, unsigned entries)
{
unsigned i;
for (i = 0; i < entries; i++, buf++, palette++)
{
*palette = (*palette & 0x00ffffff) | *buf << 24;
}
return true;
}
bool png_realloc_idat(const struct png_chunk *chunk, struct idat_buffer *buf) bool png_realloc_idat(const struct png_chunk *chunk, struct idat_buffer *buf)
{ {
uint8_t *new_buffer = (uint8_t*)realloc(buf->data, buf->size + chunk->size); uint8_t *new_buffer = (uint8_t*)realloc(buf->data, buf->size + chunk->size);
@ -900,7 +915,7 @@ bool rpng_iterate_image(rpng_t *rpng)
{ {
unsigned entries = chunk.size / 3; unsigned entries = chunk.size / 3;
if (!rpng->has_ihdr || rpng->has_plte || rpng->has_iend || rpng->has_idat) if (!rpng->has_ihdr || rpng->has_plte || rpng->has_iend || rpng->has_idat || rpng->has_trns)
goto error; goto error;
if (chunk.size % 3) if (chunk.size % 3)
@ -918,6 +933,28 @@ bool rpng_iterate_image(rpng_t *rpng)
} }
break; break;
case PNG_CHUNK_tRNS:
{
unsigned entries = chunk.size / 3;
if (rpng->has_idat)
goto error;
if (rpng->ihdr.color_type == PNG_IHDR_COLOR_PLT)
{
/* we should compare with the number of palette entries */
if (chunk.size > 256)
goto error;
if (!png_read_trns(buf, rpng->palette, chunk.size))
goto error;
}
/* TODO: support colorkey in grayscale and truecolor images */
rpng->has_trns = true;
}
break;
case PNG_CHUNK_IDAT: case PNG_CHUNK_IDAT:
if (!(rpng->has_ihdr) || rpng->has_iend || (rpng->ihdr.color_type == PNG_IHDR_COLOR_PLT && !(rpng->has_plte))) if (!(rpng->has_ihdr) || rpng->has_iend || (rpng->ihdr.color_type == PNG_IHDR_COLOR_PLT && !(rpng->has_plte)))
goto error; goto error;