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/**
*
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
* $Id$
*/
#include "png.h"
#ifdef WIN32
#include "BLI_winstuff.h"
#endif
#include "BLI_blenlib.h"
#include "imbuf.h"
#include "imbuf_patch.h"
#include "IMB_imbuf_types.h"
#include "IMB_imbuf.h"
#include "IMB_allocimbuf.h"
#include "IMB_cmap.h"
static void
WriteData(
png_structp png_ptr,
png_bytep data,
png_size_t length);
static void
Flush(
png_structp png_ptr);
static void
WriteData(
png_structp png_ptr,
png_bytep data,
png_size_t length)
{
ImBuf *ibuf = (ImBuf *) png_get_io_ptr(png_ptr);
// if buffer is to small increase it.
while (ibuf->encodedsize + length > ibuf->encodedbuffersize) {
imb_enlargeencodedbufferImBuf(ibuf);
}
memcpy(ibuf->encodedbuffer + ibuf->encodedsize, data, length);
ibuf->encodedsize += length;
}
static void
Flush(
png_structp png_ptr)
{
}
short IMB_png_encode(struct ImBuf *ibuf, int file, int flags)
{
png_structp png_ptr;
png_infop info_ptr;
unsigned char *pixels = 0;
unsigned char *from, *to;
png_bytepp row_pointers = 0;
int i, bytesperpixel, color_type;
FILE *fp = 0;
bytesperpixel = (ibuf->depth + 7) >> 3;
if ((bytesperpixel > 4) || (bytesperpixel == 2)) {
printf("imb_png_encode: unsupported bytes per pixel: %d\n", bytesperpixel);
return (0);
}
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if (png_ptr == NULL) {
printf("Cannot png_create_write_struct\n");
return 0;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
printf("Cannot png_create_info_struct\n");
return 0;
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
if (pixels) MEM_freeN(pixels);
if (row_pointers) MEM_freeN(row_pointers);
// printf("Aborting\n");
if (fp) {
fflush(fp);
fclose(fp);
}
return 0;
}
// copy image data
pixels = MEM_mallocN(ibuf->x * ibuf->y * bytesperpixel * sizeof(unsigned char), "pixels");
if (pixels == NULL) {
printf("Cannot allocate pixels array\n");
return 0;
}
from = (unsigned char *) ibuf->rect;
to = pixels;
switch (bytesperpixel) {
case 4:
color_type = PNG_COLOR_TYPE_RGBA;
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to[3] = from[3];
to += 4; from += 4;
}
break;
case 3:
color_type = PNG_COLOR_TYPE_RGB;
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to[1] = from[1];
to[2] = from[2];
to += 3; from += 4;
}
break;
case 1:
color_type = PNG_COLOR_TYPE_GRAY;
for (i = ibuf->x * ibuf->y; i > 0; i--) {
to[0] = from[0];
to++; from += 4;
}
break;
}
if (flags & IB_mem) {
// create image in memory
imb_addencodedbufferImBuf(ibuf);
ibuf->encodedsize = 0;
png_set_write_fn(png_ptr,
(png_voidp) ibuf,
WriteData,
Flush);
} else {
fp = fdopen(file, "wb");
png_init_io(png_ptr, fp);
}
/*
png_set_filter(png_ptr, 0,
PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE |
PNG_FILTER_SUB | PNG_FILTER_VALUE_SUB |
PNG_FILTER_UP | PNG_FILTER_VALUE_UP |
PNG_FILTER_AVG | PNG_FILTER_VALUE_AVG |
PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
PNG_ALL_FILTERS);
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
*/
// png image settings
png_set_IHDR(png_ptr,
info_ptr,
ibuf->x,
ibuf->y,
8,
color_type,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
// write the file header information
png_write_info(png_ptr, info_ptr);
// allocate memory for an array of row-pointers
row_pointers = (png_bytepp) MEM_mallocN(ibuf->y * sizeof(png_bytep), "row_pointers");
if (row_pointers == NULL) {
printf("Cannot allocate row-pointers array\n");
return 0;
}
// set the individual row-pointers to point at the correct offsets
for (i = 0; i < ibuf->y; i++) {
row_pointers[ibuf->y-1-i] = (png_bytep)
((unsigned char *)pixels + (i * ibuf->x) * bytesperpixel * sizeof(unsigned char));
}
// write out the entire image data in one call
png_write_image(png_ptr, row_pointers);
// write the additional chunks to the PNG file (not really needed)
png_write_end(png_ptr, info_ptr);
// clean up
MEM_freeN(pixels);
MEM_freeN(row_pointers);
png_destroy_write_struct(&png_ptr, &info_ptr);
if (fp) {
fflush(fp);
fclose(fp);
}
return(1);
}
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