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PNG write support from DrSpliff

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This commit is contained in:
Bill Currie 2003-09-09 16:18:13 +00:00
parent 9607b8f5f2
commit 4ce44cf9eb
2 changed files with 98 additions and 0 deletions
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1
include/QF/png.h
View file

@ -35,5 +35,6 @@
#include "QF/quakefs.h"
struct tex_s *LoadPNG (QFile *infile);
void WritePNG (const char *fileName, byte *data, int width, int height);
#endif//__QF_png_h

97
libs/image/png.c
View file

@ -60,6 +60,13 @@ user_read_data (png_structp png_ptr, png_bytep data, png_size_t length)
Qread ((QFile *) png_get_io_ptr (png_ptr), data, length);
}
/* Qwrite wrapper for libpng */
static void
user_write_data (png_structp png_ptr, png_bytep data, png_size_t length)
{
Qwrite ((QFile *) png_get_io_ptr (png_ptr), data, length);
}
/* Basicly taken from the libpng example rpng-x */
static int
readpng_init (QFile *infile, png_structp *png_ptr, png_infop *info_ptr)
@ -180,6 +187,90 @@ LoadPNG (QFile *infile)
return (tex);
}
#define WRITEPNG_BIT_DEPTH 8
void
WritePNG (const char *fileName, byte *data, int width, int height)
{
QFile *outfile;
png_uint_32 i;
png_structp png_ptr;
png_infop info_ptr;
png_bytepp row_pointers = NULL;
/* initialize write struct */
png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
Sys_Printf ("png_Create_write_struct failed\n");
return;
}
info_ptr = png_create_info_struct (png_ptr);
if (png_ptr == NULL) {
png_destroy_write_struct (&png_ptr, NULL);
Sys_Printf ("png_create_info_struct failed\n");
return;
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_write_struct (&png_ptr, &info_ptr);
return;
}
outfile = Qopen (fileName, "wb");
if (!outfile) {
Sys_Printf ("Couldn't open %s\n", fileName);
return; /* Can't open file */
}
/* FIXME: NULL should be a QF equiv to fflush? */
png_set_write_fn (png_ptr, outfile, user_write_data, NULL);
/* Write the header */
if (setjmp(png_jmpbuf(png_ptr))) {
Sys_Printf ("Error writing png header\n");
return;
}
png_set_IHDR (png_ptr, info_ptr, width, height, WRITEPNG_BIT_DEPTH,
PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
/* NOTE: Write gamma support? */
/* png_set_gAMA (png_ptr, info_ptr, gamma); */
png_set_bgr(png_ptr);
png_write_info (png_ptr, info_ptr);
/* Setup row pointers */
if ((row_pointers = (png_bytepp)malloc(height * sizeof(png_bytep))) == NULL) {
png_destroy_write_struct (&png_ptr, &info_ptr);
return; /* Out of memory */
}
for (i = 0; i < height; i++) {
row_pointers[height - i - 1] = data + (i * width * 3);
}
if (setjmp(png_jmpbuf(png_ptr))) {
Sys_Printf ("Error writing PNG image data\n");
return;
}
png_write_image (png_ptr, row_pointers);
/* end write */
if (setjmp(png_jmpbuf(png_ptr))) {
Sys_Printf ("Error writing end of PNG image\n");
return;
}
png_write_end (png_ptr, NULL);
Qclose (outfile);
}
#else
#include "QF/image.h"
@ -191,4 +282,10 @@ LoadPNG (QFile *infile)
return 0;
}
void
WritePNG (const char *fileName, byte *data, int width, int height)
{
return;
}
#endif