Commit 8c161ba2 authored by FRIGN's avatar FRIGN

ff2png: Export 16-Bit RGBA PNG's so we don't lose data

parent 5bb4be01
......@@ -15,8 +15,8 @@ main(int argc, char *argv[])
{
png_structp png_struct_p;
png_infop png_info_p;
uint8_t hdr[16], *png_row;
uint16_t tmp16;
uint8_t hdr[16];
uint16_t tmp16, *png_row;
png_uint_32 width, height, i;
png_size_t png_row_len, j;
......@@ -46,12 +46,12 @@ main(int argc, char *argv[])
return 1;
}
png_init_io(png_struct_p, stdout);
png_set_IHDR(png_struct_p, png_info_p, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,
png_set_IHDR(png_struct_p, png_info_p, width, height, 16, PNG_COLOR_TYPE_RGB_ALPHA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(png_struct_p, png_info_p);
/* write rows */
png_row_len = strlen("RGBA") * width * sizeof(uint8_t);
png_row_len = strlen("RGBA") * width * sizeof(uint16_t);
png_row = malloc(png_row_len);
if (!png_row) {
fprintf(stderr, "failed to allocate row-buffer\n");
......@@ -59,15 +59,14 @@ main(int argc, char *argv[])
}
for (i = 0; i < height; ++i) {
for (j = 0; j < png_row_len; ++j) {
for (j = 0; j < png_row_len / sizeof(uint16_t); ++j) {
if (fread(&tmp16, 1, sizeof(uint16_t), stdin) != sizeof(uint16_t)) {
fprintf(stderr, "unexpected EOF or row-skew\n");
return 1;
}
/* ((2^16-1) / 255) == 257 */
png_row[j] = (uint8_t)(ntohs(tmp16) / 257);
png_row[j] = tmp16;
}
png_write_row(png_struct_p, png_row);
png_write_row(png_struct_p, (uint8_t *)png_row);
}
png_write_end(png_struct_p, NULL);
......
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