blob: 8ed3faa2c8a28e47ebed50fc4dc387b8483eed30 [file] [log] [blame]
// Copyright 2002-2010 Guillaume Cottenceau.
// This software may be freely redistributed under the terms of
// the X11 license.
// Function write_png_file taken slightly modified from
#include "glbench/png_helper.h"
#include <png.h>
#include <stdio.h>
#include <base/files/file_util.h>
#include <base/memory/scoped_ptr.h>
#include <gflags/gflags.h>
void abort_(const char * s, ...) {
va_list args;
va_start(args, s);
vfprintf(stderr, s, args);
fprintf(stderr, "\n");
void write_png_file(const char* file_name, char* pixels, int width, int height)
int x, y;
png_bytep *row_pointers;
png_structp png_ptr;
png_infop info_ptr;
png_byte bit_depth = 8; // 8 bits per channel RGBA
png_byte color_type = 6; // RGBA
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
char *p = pixels;
for (y=height-1; y>=0; y--) {
row_pointers[y] = (png_byte*) malloc(4*width);
for (x=0; x<width; x++) {
png_byte* pixel = &(row_pointers[y][x*4]);
pixel[0] = *p; p++; // R
pixel[1] = *p; p++; // G
pixel[2] = *p; p++; // B
pixel[3] = *p; p++; // A
/* create file */
FILE *fp = fopen(file_name, "wb");
if (!fp)
abort_("[write_png_file] File %s could not be opened for writing",
/* initialize stuff */
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr)
abort_("[write_png_file] png_create_write_struct failed");
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
abort_("[write_png_file] png_create_info_struct failed");
if (setjmp(png_jmpbuf(png_ptr)))
abort_("[write_png_file] Error during init_io");
png_init_io(png_ptr, fp);
/* write header */
if (setjmp(png_jmpbuf(png_ptr)))
abort_("[write_png_file] Error during writing header");
png_set_IHDR(png_ptr, info_ptr, width, height,
bit_depth, color_type, PNG_INTERLACE_NONE,
png_write_info(png_ptr, info_ptr);
/* write bytes */
if (setjmp(png_jmpbuf(png_ptr)))
abort_("[write_png_file] Error during writing bytes");
png_write_image(png_ptr, row_pointers);
/* end write */
if (setjmp(png_jmpbuf(png_ptr)))
abort_("[write_png_file] Error during end of write");
png_write_end(png_ptr, NULL);
/* cleanup heap allocation */
for (y=0; y<height; y++)
// Try to flush saved image to disk such that more data survives a hard crash.