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#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <png.h>
#include "client.h"
#include "log.h"
#include "background.h"
#define HEADER_BYTES 8
void load_background(struct client_state *state, const char *filename)
{
FILE *fp = fopen(filename, "rb");
uint8_t header[HEADER_BYTES];
if (!fp) {
log_error("Couldn't open %s\n", filename);
return;
}
if (fread(header, 1, HEADER_BYTES, fp) != HEADER_BYTES) {
log_error("Failed to read camera data: %s\n", filename);
fclose(fp);
return;
}
if (png_sig_cmp(header, 0, HEADER_BYTES)) {
log_error("Not a PNG file: %s\n", filename);
fclose(fp);
return;
}
png_structp png_ptr = png_create_read_struct(
PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (!png_ptr) {
log_error("Couldn't create PNG read struct.\n");
fclose(fp);
return;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
fclose(fp);
log_error("Couldn't create PNG info struct.\n");
return;
}
if (setjmp(png_jmpbuf(png_ptr)) != 0) {
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
fclose(fp);
log_error("Couldn't setjmp for libpng.\n");
return;
}
png_init_io(png_ptr, fp);
png_set_sig_bytes(png_ptr, HEADER_BYTES);
png_read_info(png_ptr, info_ptr);
uint32_t width = png_get_image_width(png_ptr, info_ptr);
uint32_t height = png_get_image_height(png_ptr, info_ptr);
//uint8_t color_type = png_get_color_type(png_ptr, info_ptr);
//uint8_t bit_depth = png_get_bit_depth(png_ptr, info_ptr);
png_set_expand(png_ptr);
png_set_gray_to_rgb(png_ptr);
png_set_filler(png_ptr, 0xFFu, PNG_FILLER_AFTER);
png_read_update_info(png_ptr, info_ptr);
uint32_t row_bytes = png_get_rowbytes(png_ptr, info_ptr);
/* Guard against integer overflow */
if (height > PNG_SIZE_MAX / row_bytes) {
png_error(png_ptr, "image_data buffer would be too large");
}
png_bytep buffer = malloc(height * row_bytes);
png_bytepp row_pointers = calloc(height, sizeof(png_bytep));
for (uint32_t y = 0; y < height; y++) {
row_pointers[y] = &buffer[y * row_bytes];
}
png_read_image(png_ptr, row_pointers);
png_read_end(png_ptr, NULL);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
free(row_pointers);
fclose(fp);
state->window.background_image.width = width;
state->window.background_image.height = height;
state->window.background_image.buffer = buffer;
}
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