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|
/* +-------------------------------------------------------------------+ */
/* | Copyright 1996, Greg Roelofs (newt@pobox.com) | */
/* | Last revised: 21 August 1996 | */
/* +-------------------------------------------------------------------+ */
/* $Id: writePNG.c,v 1.7 1996/08/29 05:24:57 torsten Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include "png.h"
#include "image.h"
#include "rwTable.h"
#ifndef Trace
# ifdef PNG_DEBUG
# define Trace(x) fprintf x ; fflush(stderr)
# else
# define Trace(x)
# endif
#endif
extern void compressColormap(Image *image);
static int
WritePNG(char *file, Image *image, int interlace_type)
{
FILE *fp = fopen(file, "wb");
char software_text[40];
int i;
png_structp png_ptr;
png_infop info_ptr;
png_textp software;
Trace((stderr, "\nGRR WritePNG: %d x %d, scale = %d\n",
image->width, image->height, image->scale));
if (!fp)
return 1;
png_ptr = (png_structp)malloc(sizeof (png_struct));
if (!png_ptr)
return 1;
info_ptr = (png_infop)malloc(sizeof (png_info));
if (!info_ptr) {
free(png_ptr);
return 1;
}
if (setjmp(png_ptr->jmpbuf)) {
png_write_destroy(png_ptr);
free(info_ptr);
free(png_ptr);
fclose(fp);
return 1;
}
png_info_init(info_ptr);
png_write_init(png_ptr);
png_init_io(png_ptr, fp);
info_ptr->width = image->width;
info_ptr->height = image->height;
if (image->isBW) {
if (image->maskData) {
info_ptr->color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
info_ptr->bit_depth = 8; /* promote to full grayscale */
} else {
info_ptr->color_type = PNG_COLOR_TYPE_GRAY;
info_ptr->bit_depth = 1;
}
Trace((stderr, "GRR WritePNG: B/W, bit_depth = %d\n",
info_ptr->bit_depth));
} else if (image->isGrey) {
info_ptr->color_type = image->maskData? PNG_COLOR_TYPE_GRAY_ALPHA :
PNG_COLOR_TYPE_GRAY;
if (image->cmapPacked)
info_ptr->bit_depth = 8;
else {
Trace((stderr,
"GRR WritePNG: isGrey: cmapSize = %d (before compressing), ",
image->cmapSize));
compressColormap(image);
Trace((stderr, "%d (after)\n", image->cmapSize));
if (image->cmapSize > 16)
info_ptr->bit_depth = 8;
else if (image->cmapSize > 4)
info_ptr->bit_depth = 4;
else if (image->cmapSize > 2)
info_ptr->bit_depth = 2;
else
info_ptr->bit_depth = 1;
Trace((stderr, "GRR WritePNG: isGrey: picked bit_depth = %d\n",
info_ptr->bit_depth));
}
} else if (image->scale == 3) {
Image *cmapImage;
/* try compressing image to palette mode, but don't force if too big */
if (!image->maskData) /* can't store alpha mask with palette image */
cmapImage = ImageCompress(image, 256, 1);
if (cmapImage) {
image = cmapImage; /* original was deleted in ImageCompress() */
} else {
info_ptr->color_type = image->maskData? PNG_COLOR_TYPE_RGB_ALPHA :
PNG_COLOR_TYPE_RGB;
info_ptr->bit_depth = 8;
Trace((stderr, "GRR WritePNG: RGB, bit_depth = 8\n"));
}
}
/*
GRR ReadPNG: reading file /home1/xpaint-images/cdrom.png
GRR ReadPNG: width = 34, height = 33
GRR ReadPNG: PNG_COLOR_TYPE_PALETTE
GRR ReadPNG: 34 x 33, scale = 1
GRR ReadPNG end: 34 x 33, scale = 1
GRR WritePNG: 34 x 33, scale = 3
GRR WritePNG: palette, bit_depth = 4, num_palette = 12
*/
/* either we're on an 8-bit or smaller display, or image->scale was 3 and
* ImageCompress() worked
*/
if (image->scale == 1) {
info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
if (image->maskData) {
fprintf(stderr,
"WritePNG: can't use alpha mask with colormapped image\n");
fflush(stderr);
}
Trace((stderr, "GRR WritePNG: palette, bit_depth = "));
if (!image->cmapPacked)
compressColormap(image);
if (image->cmapSize > 16)
info_ptr->bit_depth = 8;
else if (image->cmapSize > 4)
info_ptr->bit_depth = 4;
else if (image->cmapSize > 2)
info_ptr->bit_depth = 2;
else
info_ptr->bit_depth = 1;
info_ptr->valid |= PNG_INFO_PLTE;
info_ptr->num_palette = image->cmapSize;
info_ptr->palette = (png_colorp)image->cmapData; /* seems to work... */
Trace((stderr, "%d, num_palette = %d\n", info_ptr->bit_depth,
info_ptr->num_palette));
#if 0
for (i = 0; i < image->cmapSize; ++i) {
info_ptr->palette[i].red =
info_ptr->palette[i].green =
info_ptr->palette[i].blue =
}
#endif
}
info_ptr->interlace_type = interlace_type;
/* set the file gamma */
info_ptr->valid |= PNG_INFO_gAMA;
#ifdef DISPLAY_GAMMA
info_ptr->gamma = 1.0 / DISPLAY_GAMMA;
#else
info_ptr->gamma = 0.45; /* default: assume PC-like system */
#endif
/* info_ptr->valid |= PNG_INFO_tEXt; DOES NOT EXIST */
/* only one text comment: Software */
software = (png_textp)malloc(sizeof(png_text));
if (software) {
/* room for up to 40 characters: */
sprintf(software_text, "XPaint %s", XPAINT_VERSION);
software->compression = -1;
software->key = "Software";
software->text = software_text;
software->text_length = strlen(software->text);
info_ptr->num_text = 1;
info_ptr->text = software;
} else {
/* couldn't malloc: oh well */
info_ptr->num_text = 0;
info_ptr->text = NULL;
}
info_ptr->valid |= PNG_INFO_tIME;
png_convert_from_time_t(&info_ptr->mod_time, time(NULL));
png_write_flush(png_ptr);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
if (image->maskData) {
/* alpha channel version */
fprintf(stderr, "WritePNG: sorry, can't write alpha images yet\n");
fflush(stderr);
png_write_destroy(png_ptr);
free(info_ptr);
free(png_ptr);
fclose(fp);
return 1;
} else {
int rowbytes = image->scale * image->width;
png_bytep *row_pointers;
if ((row_pointers = (png_bytep *)
malloc(image->height * sizeof(png_bytep))) == 0) {
RWSetMsg("Out of memory in WritePNG()");
return 1;
}
for (i = 0; i < image->height; ++i)
row_pointers[i] = (png_bytep)image->data + i*rowbytes;
png_write_image(png_ptr, row_pointers);
}
png_write_end(png_ptr, NULL);
png_write_destroy(png_ptr);
if (software)
free(software); /* we LOVE free software!! */
free(info_ptr);
free(png_ptr); /* necessary?? */
fclose(fp);
return 0;
}
int
WritePNGn(char *file, Image *image)
{
return WritePNG(file, image, 0);
}
int
WritePNGi(char *file, Image *image)
{
return WritePNG(file, image, 1);
}
|
