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/*
* Copyright © 2007 Nicolai Haehnle
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef PIGLIT_HAS_PNG
#include <png.h>
#endif
#include <piglit/gl_wrap.h>
#define aborts(s) _abortf("piglit_write_png: %s", s)
#define abortf(s, ...) _abortf("piglit_write_png" s, __VA_ARGS__)
static void
_abortf(const char *s, ...)
{
va_list args;
va_start(args, s);
vfprintf(stderr, s, args);
fprintf(stderr, "\n");
va_end(args);
abort();
}
/* Write a PNG file.
*
* \param filename The filename to write (i.e. "foo.png")
* \param base_format GL_RGBA or GL_RGB
* \param width The width of the image
* \param height The height of the image
* \param data The image data stored as unsigned bytes
* \param flip_y Whether to flip the image upside down (for FBO data)
*/
void
piglit_write_png(const char *filename,
GLenum base_format,
int width,
int height,
GLubyte *data,
bool flip_y)
{
#ifndef PIGLIT_HAS_PNG
aborts("Piglit not built with libpng support.");
#else
FILE *fp;
png_structp png;
png_infop info;
GLubyte *row;
int bytes;
int color_type;
int y;
switch (base_format) {
case GL_RGBA:
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
bytes = 4;
break;
case GL_RGB:
color_type = PNG_COLOR_TYPE_RGB;
bytes = 3;
break;
default:
abortf("unknown format %04x", base_format);
break;
}
fp = fopen(filename, "w");
if (!fp)
abortf("failed to open `%s'", filename);
png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png)
aborts("png_create_write_struct() failed");
info = png_create_info_struct(png);
if (!info)
aborts("png_create_info_struct failed");
if (setjmp(png_jmpbuf(png)))
aborts("png_init_io failed");
png_init_io(png, fp);
/* write header */
if (setjmp(png_jmpbuf(png)))
aborts("Write error");
png_set_IHDR(png, info, width, height,
8, color_type, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
png_write_info(png, info);
if (flip_y) {
row = data + (height * width * bytes);
for (y = 0; y < height; ++y) {
row -= width * bytes;
png_write_row(png, row);
}
} else {
row = data;
for (y = 0; y < height; ++y) {
png_write_row(png, row);
row += width * bytes;
}
}
png_write_end(png, 0);
fclose(fp);
#endif
}
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