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#include <config.h>
#ifndef _plan9_
#include <aconfig.h>
#ifdef USE_PNG
#include <png.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#ifndef NO_MALLOC_H
#include <malloc.h>
#endif
#include <errno.h>
#else
#include <u.h>
#include <libc.h>
#include <stdio.h>
#endif
#include <filter.h>
#include <version.h>
#include <misc-f.h>
#include <xio.h>
#ifndef USE_PNG
CONST char *writepng(xio_constpath filename, CONST struct image *img)
{
return
"XaoS can not save images because it was incorrectly compiled. Please compile it with zlib and libpng";
}
#else
CONST char *writepng(xio_constpath filename, CONST struct image *image)
{
png_structp png_ptr;
png_infop info_ptr;
png_color palette[256];
volatile unsigned short a = 255;
volatile unsigned char *b = (volatile unsigned char *) &a;
#ifdef _undefined_
static char text[] =
"XaoS" XaoS_VERSION " - a realtime interactive fractal zoomer";
static png_text comments[] = {
{
-1,
"Software",
text,
sizeof(text)}
};
#endif
FILE *file = fopen(filename, "wb");
errno = -1;
if (file == NULL) {
return strerror(errno);
}
png_ptr =
png_create_write_struct(PNG_LIBPNG_VER_STRING, (void *) NULL,
(png_error_ptr) NULL,
(png_error_ptr) NULL);
if (!png_ptr)
return "Unable to initialize pnglib";
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) {
png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
return "No memory to create png info structure";
}
if (setjmp(png_ptr->jmpbuf)) {
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(file);
return strerror(errno);
}
png_init_io(png_ptr, file);
png_set_filter(png_ptr, 0,
PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_PAETH |
PNG_FILTER_UP | PNG_FILTER_AVG);
/* set the zlib compression level */
/*png_set_compression_level(png_ptr, Z_BEST_COMPRESSION); */
png_set_compression_level(png_ptr, Z_DEFAULT_COMPRESSION);
/* set other zlib parameters */
png_set_compression_mem_level(png_ptr, 8);
png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
png_set_compression_window_bits(png_ptr, 15);
png_set_compression_method(png_ptr, 8);
info_ptr->width = image->width;
info_ptr->height = image->height;
/*info_ptr->gamma=1.0; */
info_ptr->gamma = 0.5;
info_ptr->valid |= PNG_INFO_gAMA | PNG_INFO_pHYs;
info_ptr->x_pixels_per_unit = (png_uint_32) (100 / image->pixelwidth);
info_ptr->y_pixels_per_unit = (png_uint_32) (100 / image->pixelheight);
switch (image->palette->type) {
case C256:
{
int i;
info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
info_ptr->bit_depth = image->bytesperpixel * 8;
info_ptr->palette = palette;
info_ptr->valid |= PNG_INFO_PLTE;
for (i = 0; i < image->palette->end; i++)
info_ptr->palette[i].red = image->palette->rgb[i][0],
info_ptr->palette[i].green = image->palette->rgb[i][1],
info_ptr->palette[i].blue = image->palette->rgb[i][2],
info_ptr->num_palette = image->palette->end;
}
break;
case SMALLITER:
case LARGEITER:
case GRAYSCALE:
info_ptr->color_type = PNG_COLOR_TYPE_GRAY;
info_ptr->bit_depth = image->bytesperpixel * 8;
break;
case TRUECOLOR:
case TRUECOLOR24:
case TRUECOLOR16:
info_ptr->color_type = PNG_COLOR_TYPE_RGB;
info_ptr->bit_depth = 8;
info_ptr->sig_bit.red = 8 - image->palette->info.truec.rprec;
info_ptr->sig_bit.green = 8 - image->palette->info.truec.gprec;
info_ptr->sig_bit.blue = 8 - image->palette->info.truec.bprec;
break;
}
info_ptr->interlace_type = 0;
#ifdef _undefined_
png_set_text(png_ptr, info_ptr, comments,
sizeof(comments) / sizeof(png_text));
#endif
png_write_info(png_ptr, info_ptr);
/*png_set_filler(png_ptr,0,PNG_FILLER_AFTER); */
png_set_packing(png_ptr);
if (image->palette->type & (TRUECOLOR | TRUECOLOR24 | TRUECOLOR16))
png_set_shift(png_ptr, &(info_ptr->sig_bit));
if (*b == 255)
png_set_swap(png_ptr);
png_set_bgr(png_ptr);
switch (image->palette->type) {
case C256:
case GRAYSCALE:
case SMALLITER:
case LARGEITER:
#ifdef STRUECOLOR24
case TRUECOLOR24:
png_write_image(png_ptr, (png_bytepp) image->currlines);
break;
#endif
case TRUECOLOR:
{
int i, y;
unsigned char *r = (unsigned char *) malloc(image->width * 3);
for (i = 0; i < image->height; i++) {
for (y = 0; y < image->width; y++)
r[y * 3 + 2] =
(((pixel32_t **) (image->
currlines))[i][y] &
image->palette->info.truec.rmask) >> image->
palette->info.truec.rshift, r[y * 3 + 1] =
(((pixel32_t **) (image->
currlines))[i][y] &
image->palette->info.truec.gmask) >> image->
palette->info.truec.gshift, r[y * 3] =
(((pixel32_t **) (image->
currlines))[i][y] &
image->palette->info.truec.bmask) >> image->
palette->info.truec.bshift;
png_write_rows(png_ptr, (png_bytepp) & r, 1);
}
}
break;
#ifdef SUPPORT16
case TRUECOLOR16:
{
int i, y;
unsigned char *r = (unsigned char *) malloc(image->width * 3);
for (i = 0; i < image->height; i++) {
for (y = 0; y < image->width; y++)
r[y * 3 + 2] =
(((pixel16_t **) (image->
currlines))[i][y] &
image->palette->info.truec.rmask) >> image->
palette->info.truec.rshift, r[y * 3 + 1] =
(((pixel16_t **) (image->
currlines))[i][y] &
image->palette->info.truec.gmask) >> image->
palette->info.truec.gshift, r[y * 3] =
(((pixel16_t **) (image->
currlines))[i][y] &
image->palette->info.truec.bmask) >> image->
palette->info.truec.bshift;
png_write_rows(png_ptr, (png_bytepp) & r, 1);
}
}
break;
#endif
}
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
fclose(file);
return NULL;
}
#endif
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