diff options
Diffstat (limited to 'src/image.c')
| -rw-r--r-- | src/image.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/image.c b/src/image.c new file mode 100644 index 0000000..618a854 --- /dev/null +++ b/src/image.c @@ -0,0 +1,141 @@ +#include <stdlib.h> +#include <png.h> + +#include "image.h" + +size_t bin_to_rgba(uint8_t** bufp, size_t size) +{ + size_t out_size = (size / 3) * 4; + uint8_t* buf = malloc(out_size); + + for (size_t i = 0, j = 0; i < size; i+=3, j+=4) + { + (buf+j)[0] = (*bufp+i)[2]; + (buf+j)[1] = (*bufp+i)[1]; + (buf+j)[2] = (*bufp+i)[0]; + (buf+j)[3] = 0xFF; + } + free(*bufp); + *bufp = buf; + return out_size; +} + + +size_t rgba_to_bin(uint8_t** bufp, size_t size) +{ + size_t out_size = (size / 4) * 3; + uint8_t* buf = malloc(out_size); + + for (size_t i = 0, j = 0; i < size; i+=4, j+=3) + { + (buf+j)[0] = (*bufp+i)[2]; + (buf+j)[1] = (*bufp+i)[1]; + (buf+j)[2] = (*bufp+i)[0]; + } + free(*bufp); + *bufp = buf; + return out_size; +} + +size_t png_to_rgba(uint8_t** bufp, size_t size) +{ + size_t out_size = 0; + + uint32_t* buf = (uint32_t*)*bufp; + FILE* fp = fmemopen(buf, size, "rb");; + png_bytep* row_pointers = NULL; + + png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + png_infop info = png_create_info_struct(png); + + png_init_io(png, fp); + png_read_info(png, info); + + if(png_get_bit_depth(png, info) == 16) png_set_strip_16(png); + + uint32_t w = png_get_image_width(png, info); + uint32_t h = png_get_image_height(png, info); + + printf("%i, %i\n", w, h); + + png_byte color_type = png_get_color_type(png, info); + + if(color_type == PNG_COLOR_TYPE_PALETTE) + png_set_palette_to_rgb(png); + + if(png_get_valid(png, info, PNG_INFO_tRNS)) + png_set_tRNS_to_alpha(png); + + row_pointers = malloc(sizeof(png_bytep) * h); + out_size = sizeof(uint32_t) * (w * h); + uint32_t* out = malloc(out_size); + for(uint32_t y = 0; y < h; y++) + { + row_pointers[y] = (png_byte*)(out+(w*y)); + } + + png_read_image(png, row_pointers); + + png_destroy_read_struct(&png, &info, NULL); + + if (fp) fclose(fp); + if (row_pointers) free(row_pointers); + + free(*bufp); + *bufp = (uint8_t*)out; + + return out_size; +} + +#define DEFAULT_WIDTH 240 + +size_t rgba_to_png(uint8_t** bufp, size_t size) +{ + uint32_t* buf = (uint32_t*)*bufp; + + size_t out_size = size; + uint32_t* out = malloc(out_size); + memset(out, 0, out_size); + //FILE *fp = fopen("out.png", "wb"); + FILE* fp = fmemopen(out, size, "wb"); + png_bytep* row_pointers = NULL; + + uint32_t w = 240; + uint32_t h = (uint32_t)((size/4)/w); + + printf("%i, %i\n", w, h); + + printf("%li\n", size); + + /* initialize stuff */ + png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + png_infop info_ptr = png_create_info_struct(png); + + png_init_io(png, fp); + + png_set_IHDR(png, info_ptr, w, h, + 8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); + + png_write_info(png, info_ptr); + + row_pointers = malloc(sizeof(png_bytep) * h); + for(uint32_t y = 0; y < h; y++) + { + row_pointers[y] = (png_byte*)(buf+(w*y)); + } + + png_write_image(png, row_pointers); + + png_write_end(png, NULL); + + free(row_pointers); + fclose(fp); + + while (!out[out_size/4]) --out_size; + + free(buf); + *bufp = out; + + return out_size; +}
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