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/* Copyright 2006 Rene Dudfield
* Copyright 2014 Tom Rothamel
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include <stdio.h>
#include <SDL.h>
#include <jpeglib.h>
static int write_jpeg (
const char *file_name,
JSAMPROW *rows,
int width,
int height,
int quality) {
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE * outfile;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
if ((outfile = fopen(file_name, "wb")) == NULL) {
SDL_SetError ("SaveJPEG: could not open %s", file_name);
return -1;
}
jpeg_stdio_dest (&cinfo, outfile);
cinfo.image_width = width;
cinfo.image_height = height;
cinfo.input_components = 3;
cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults (&cinfo);
jpeg_set_quality (&cinfo, quality, TRUE);
jpeg_start_compress (&cinfo, TRUE);
jpeg_write_scanlines(&cinfo, rows, height);
jpeg_finish_compress (&cinfo);
fclose (outfile);
jpeg_destroy_compress (&cinfo);
return 0;
}
int Pygame_SDL2_SaveJPEG(SDL_Surface *surface, const char *file, int quality) {
SDL_Surface *rgb_surf;
JSAMPROW *samples;
int i, rv;
if (quality < 0) {
quality = 90;
}
rgb_surf = SDL_ConvertSurfaceFormat(surface, SDL_PIXELFORMAT_RGB24, 0);
if (! rgb_surf) {
return -1;
}
samples = (JSAMPROW *) malloc (sizeof(JSAMPROW) * rgb_surf->h);
if (!samples) {
SDL_FreeSurface(rgb_surf);
return -1;
}
/* copy pointers to the scanlines... since they might not be packed.
*/
for (i = 0; i < rgb_surf->h; i++) {
samples[i] = ((unsigned char*)rgb_surf->pixels) + i * rgb_surf->pitch;
}
rv = write_jpeg(file, samples, surface->w, surface->h, quality);
free(samples);
SDL_FreeSurface(rgb_surf);
return rv;
}
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