| ␉return 1;␊ |
| }␊ |
| ␊ |
| uint32_t vector8_resizev(vector8_t *p, size_t size, uint8_t value)␊ |
| {␉// resize and give all new elements the value␊ |
| ␉size_t oldsize = p->size, i;␊ |
| ␉if (!vector8_resize(p, size))␊ |
| ␉␉return 0;␊ |
| ␉for (i = oldsize; i < size; i++)␊ |
| ␉␉p->data[i] = value;␊ |
| ␉return 1;␊ |
| }␊ |
| ␊ |
| void vector8_init(vector8_t *p)␊ |
| {␊ |
| ␉p->data = NULL;␊ |
| ␉p->size = p->allocsize = 0;␊ |
| }␊ |
| ␊ |
| vector8_t *vector8_new(size_t size, uint8_t value)␊ |
| {␊ |
| ␉vector8_t *p = png_alloc_malloc(sizeof (vector8_t));␊ |
| ␉if(!p)␊ |
| ␉{␊ |
| ␉␉return NULL;␊ |
| ␉}␊ |
| ␉vector8_init(p);␊ |
| ␉if (size && !vector8_resizev(p, size, value))␊ |
| ␉{␊ |
| ␉␉vector8_cleanup(p);␊ |
| ␉if (!p)␊ |
| return NULL;␊ |
| ␉p->data = NULL;␊ |
| ␉p->size = p->allocsize = 0;␊ |
| ␉if (size) {␊ |
| size_t i;␊ |
| size_t newsize = size * sizeof (uint32_t) * 2;␊ |
| void *data = png_alloc_malloc(newsize);␊ |
| if (!data) {␊ |
| ␉␉png_alloc_free(p);␊ |
| ␉␉return NULL;␊ |
| ␉}␊ |
| }␊ |
| p->data = (uint8_t *) data;␊ |
| p->allocsize = newsize;␊ |
| p->size = size;␊ |
| for (i = 0; i < size; ++i)␊ |
| p->data[i] = value;␊ |
| }␊ |
| ␉return p;␊ |
| }␊ |
| ␊ |
|
| int PNG_convert(const PNG_info_t *info, vector8_t *out, const uint8_t *in)␊ |
| {␉// converts from any color type to 32-bit. return value = LodePNG error code␊ |
| ␉size_t i, c;␊ |
| ␉uint32_t bitDepth, colorType;␊ |
| ␉bitDepth = info->bitDepth;␊ |
| ␉colorType = info->colorType;␊ |
| ␉size_t numpixels = info->width * info->height, bp = 0;␊ |
| ␉vector8_resize(out, numpixels * 4);␊ |
| ␉uint8_t *out_data = out->size ? out->data : 0;␊ |
| ␉size_t numpixels = info->width * info->height;␊ |
| if (!numpixels)␊ |
| return 0; // nothing to do␊ |
| ␉if (!vector8_resize(out, numpixels * 4))␊ |
| return 83; // out of memory␊ |
| size_t bp = 0;␊ |
| ␉uint32_t bitDepth = info->bitDepth;␊ |
| ␉uint32_t colorType = info->colorType;␊ |
| ␉uint8_t *out_data = out->data;␊ |
| ␉if (bitDepth == 8 && colorType == 0) // greyscale␊ |
| ␉␉for (i = 0; i < numpixels; i++) {␊ |
| ␉␉␉out_data[4 * i + 0] = out_data[4 * i + 1] = out_data[4 * i + 2] = in[i];␊ |
|
| ␉␉return NULL;␊ |
| ␉size_t pos = 33; // first byte of the first chunk after the header␊ |
| ␉vector8_t *idat = NULL; // the data from idat chunks␊ |
| ␉bool IEND = false, known_type = true;␊ |
| ␉bool IEND = false;␊ |
| ␉info->key_defined = false;␊ |
| ␉// loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. IDAT data is␊ |
| ␉// put at the start of the in buffer␊ |
| ␉while (!IEND) {␊ |
| ␉␉size_t i, j;␊ |
| ␉␉size_t i;␊ |
| ␉␉if (pos + 8 >= size) {␊ |
| ␉␉␉PNG_error = 30; // error: size of the in buffer too small to contain next chunk␊ |
| ␉␉␉return NULL;␊ |
|
| ␉␉␉␉return NULL;␊ |
| ␉␉␉}␊ |
| ␉␉␉for (i = 0; i < info->palette->size; i += 4) {␊ |
| size_t j;␊ |
| ␉␉␉␉for (j = 0; j < 3; j++)␊ |
| ␉␉␉␉␉info->palette->data[i + j] = in[pos++]; // RGB␊ |
| ␉␉␉␉info->palette->data[i + 3] = 255; // alpha␊ |
|
| ␉␉␉␉return NULL;␊ |
| ␉␉␉}␊ |
| ␉␉␉pos += (chunkLength + 4); // skip 4 letters and uninterpreted data of unimplemented chunk␊ |
| ␉␉␉known_type = false;␊ |
| ␉␉}␊ |
| ␉␉pos += 4; // step over CRC (which is ignored)␊ |
| ␉}␊ |
| if (!idat) {␊ |
| PNG_error = 1; // no data seen␊ |
| return NULL;␊ |
| }␊ |
| ␉uint32_t bpp = PNG_getBpp(info);␊ |
| ␉vector8_t *scanlines; // now the out buffer will be filled␊ |
| ␉scanlines = vector8_new(((info->width * (info->height * bpp + 7)) / 8) + info->height, 0);␊ |
