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add opengl replacement texture support (requires libpng and zlib) (d1x r1.42, r1.1, r1.10, r1.4, r1.1)

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Bradley Bell 2004-05-22 23:41:29 +00:00
parent 012659cb9e
commit 9e217b256b
3 changed files with 117 additions and 0 deletions
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21
include/pngfile.h Normal file
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@ -0,0 +1,21 @@
/* $Id: pngfile.h,v 1.1 2004-05-22 23:41:29 btb Exp $ */
#ifndef PNGFILE_H
#define PNGFILE_H
typedef struct _png_data {
unsigned int width;
unsigned int height;
unsigned int depth;
unsigned int channels;
unsigned paletted:1;
unsigned color:1;
unsigned alpha:1;
unsigned char *data;
unsigned char *palette;
unsigned int num_palette;
} png_data;
extern int read_png(char *filename, png_data *pdata);
#endif

2
misc/Makefile.am
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@ -9,6 +9,8 @@ libmisc_a_SOURCES = ${PNG_SRCS} \
args.c error.c strio.c \
d_io.c hash.c strutil.c
EXTRA_libmisc_a_SOURCES = pngfile.c
# checker.c
#checker.o: checker.c

94
misc/pngfile.c Normal file
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/* $Id: pngfile.c,v 1.1 2004-05-22 23:41:29 btb Exp $ */
#include <stdio.h>
#include <png.h>
#include "pngfile.h"
#include "u_mem.h"
#include "pstypes.h"
int read_png(char *filename, png_data *pdata)
{
ubyte header[8];
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_bytepp row_pointers = NULL;
png_uint_32 width, height;
int depth, color_type;
int i;
FILE *fp = NULL;
if (!filename || !pdata)
return 0;
if ((fp = fopen(filename, "rb")) == NULL)
return 0;
fread(header, 1, 8, fp);
if (!png_check_sig(header, 8))
return 0;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info_ptr = png_create_info_struct(png_ptr);
pdata->data = pdata->palette = NULL;
pdata->num_palette = 0;
if (setjmp(png_ptr->jmpbuf))
{
png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
if (pdata->data)
free(pdata->data);
if (pdata->palette)
free(pdata->palette);
if (row_pointers)
free(row_pointers);
fclose(fp);
return 0;
}
png_init_io(png_ptr, fp);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &depth, &color_type, NULL, NULL, NULL);
pdata->width = width;
pdata->height = height;
pdata->depth = depth;
pdata->data = (ubyte*)malloc(png_get_rowbytes(png_ptr, info_ptr) * height);
row_pointers = (png_bytep *)malloc(sizeof(png_bytep) * height);
for (i = 0; i < height; i++)
row_pointers[i] = &pdata->data[png_get_rowbytes(png_ptr, info_ptr) * i];
png_read_image(png_ptr, row_pointers);
free(row_pointers);
row_pointers=NULL;
png_read_end(png_ptr, info_ptr);
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
png_colorp palette;
if (png_get_PLTE(png_ptr, info_ptr, &palette, &pdata->num_palette))
{
pdata->palette = (ubyte*)malloc(pdata->num_palette * 3);
memcpy(pdata->palette, palette, pdata->num_palette * 3);
}
}
pdata->paletted = (color_type & PNG_COLOR_MASK_PALETTE) > 0;
pdata->color = (color_type & PNG_COLOR_MASK_COLOR) > 0;
pdata->alpha = (color_type & PNG_COLOR_MASK_ALPHA) > 0;
if (pdata->color && pdata->alpha)
pdata->channels = 4;
else if (pdata->color && !pdata->alpha)
pdata->channels = 3;
else if (!pdata->color && pdata->alpha)
pdata->channels = 2;
else //if (!pdata->color && !pdata->alpha)
pdata->channels = 1;
png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
fclose(fp);
return 1;
}