2D_Engine_C/asset_builder/image.c

141 lines
3.7 KiB
C

#include "image.h"
#include <png.h>
#include <stdlib.h>
#include "utils.h"
#include "errors.h"
int build_image(const char *input_file_name, FILE *output_file, uint32_t *asset_size)
{
FILE *input_file = fopen(input_file_name, "rb");
if(!input_file)
{
error_printf("Failed to open input file.");
return EXIT_FAILURE;
}
png_struct *img = NULL;
png_info *img_info = NULL;
// Check png autenticity.
uint8_t sig[8];
if(file_read(sig, sizeof(*sig), sizeof(sig), input_file)) goto_failure;
if(!png_check_sig(sig, 8))
{
error_printf("Png file is not valid.");
goto failure;
}
// PNG structs.
img = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!img)
{
error_printf("Failed to allocate png ptr.");
goto failure;
}
img_info = png_create_info_struct(img);
if(!img_info)
{
error_printf("Failed to allocate png info.");
goto failure;
}
// Fill structs and load data.
png_init_io(img, input_file);
png_set_sig_bytes(img, 8);
png_read_info(img, img_info);
{
uint16_t width = png_get_image_width(img, img_info);
uint16_t height = png_get_image_height(img, img_info);
size_t row_length = png_get_rowbytes(img, img_info);
// Write image size.
if(file_write(&width, sizeof(width), 1, output_file)) goto_failure;
*asset_size += sizeof(width);
if(file_write(&height, sizeof(height), 1, output_file)) goto_failure;
*asset_size += sizeof(height);
// Prepare storage.
uint8_t *src_pixels = calloc(height * row_length, sizeof(*src_pixels));
if(!src_pixels)
{
error_printf("Failed to alloc memory : %d", errno);
goto failure;
}
uint8_t **src_row_ptrs = calloc(height, sizeof(*src_row_ptrs));
if(!src_row_ptrs)
{
error_printf("Failed to alloc memory : %d", errno);
free(src_pixels);
goto failure;
}
for(uint16_t i = 0; i < height; i++)
src_row_ptrs[i] = &src_pixels[i * row_length];
// Read pixels.
png_read_image(img, src_row_ptrs);
free(src_row_ptrs);
png_destroy_read_struct(&img, &img_info, NULL);
uint16_t *dst_pixels = calloc(width * height, sizeof(*dst_pixels));
if(!dst_pixels)
{
error_printf("Failed to alloc memory : %d", errno);
free(src_pixels);
goto failure;
}
for(uint16_t i = 0; i < height; i++)
{
for(uint16_t j = 0; j < width; j += 1)
{
if(src_pixels[i * row_length + j * 4 + 3])
{
uint8_t r = src_pixels[i * row_length + j * 4] >> 3;
uint8_t g = src_pixels[i * row_length + j * 4 + 1] >> 2;
uint8_t b = src_pixels[i * row_length + j * 4 + 2] >> 3;
dst_pixels[i * width + j] = ((r) << 11) | ((g) << 5) | b;
}
else
{
dst_pixels[i * width + j] = 0x0001;
}
}
}
free(src_pixels);
if(file_write(dst_pixels, sizeof(*dst_pixels), width * height, output_file))
{
free(dst_pixels);
goto_failure;
}
*asset_size += width * height * sizeof(*dst_pixels);
free(dst_pixels);
}
if(fclose(input_file))
{
error_printf("Failed to close input file : %d", errno);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
failure:
if(fclose(input_file))
error_printf("Failed to close input file : %d", errno);
return EXIT_FAILURE;
}