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/* input-png.c: PNG loader for autotrace
Copyright (C) 2000 MenTaLguY <mental@rydia.net>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* Def: HAVE_CONFIG_H */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "types.h"
#include "bitmap.h"
#include "message.h"
#include "xstd.h"
#include <png.h>
#include "input-png.h"
static volatile char rcsid[]="$Id: input-png.c,v 1.16 2002/10/05 19:38:25 masata-y Exp $";
static png_bytep * read_png(png_structp png_ptr, png_infop info_ptr, at_input_opts_type * opts);
/* for pre-1.0.6 versions of libpng */
#ifndef png_jmpbuf
# define png_jmpbuf(png_ptr) (png_ptr)->jmpbuf
#endif
static void handle_warning(png_structp png, const at_string message) {
LOG1("PNG warning: %s", message);
at_exception_warning((at_exception_type *)png->error_ptr,
message);
/* at_exception_fatal((at_exception_type *)at_png->error_ptr,
"PNG warning"); */
}
static void handle_error(png_structp png, const at_string message) {
LOG1("PNG error: %s", message);
at_exception_fatal((at_exception_type *)png->error_ptr,
message);
/* at_exception_fatal((at_exception_type *)at_png->error_ptr,
"PNG error"); */
}
static void finalize_structs(png_structp png, png_infop info,
png_infop end_info)
{
png_destroy_read_struct(png ? &png : NULL,
info ? &info : NULL,
end_info ? &end_info : NULL);
}
static int init_structs(png_structp *png, png_infop *info,
png_infop *end_info, at_exception_type * exp)
{
*png = NULL;
*info = *end_info = NULL;
*png = png_create_read_struct(PNG_LIBPNG_VER_STRING, exp,
(png_error_ptr)handle_error, (png_error_ptr)handle_warning);
if (*png) {
*info = png_create_info_struct(*png);
if (*info) {
*end_info = png_create_info_struct(*png);
if (*end_info) return 1;
}
finalize_structs(*png, *info, *end_info);
}
return 0;
}
#define CHECK_ERROR() do { if (at_exception_got_fatal(exp)) \
{ \
result = 0; \
goto cleanup; \
} } while (0)
static int load_image(at_bitmap_type *image, FILE *stream, at_input_opts_type * opts, at_exception_type * exp)
{
png_structp png;
png_infop info, end_info;
png_bytep *rows;
unsigned short width, height, row;
int pixel_size;
int result = 1;
if (!init_structs(&png, &info, &end_info, exp))
return 0;
png_init_io(png, stream);
CHECK_ERROR();
rows = read_png(png, info, opts);
width = (unsigned short)png_get_image_width(png, info);
height = (unsigned short)png_get_image_height(png, info);
if ( png_get_color_type(png, info) == PNG_COLOR_TYPE_GRAY ) {
pixel_size = 1;
} else {
pixel_size = 3;
}
*image = at_bitmap_init(NULL, width, height, pixel_size);
for ( row = 0 ; row < height ; row++, rows++ ) {
memcpy(AT_BITMAP_PIXEL(*image, row, 0), *rows,
width * pixel_size * sizeof(unsigned char));
}
cleanup:
finalize_structs(png, info, end_info);
return result;
}
at_bitmap_type input_png_reader(at_string filename, at_input_opts_type * opts,
at_msg_func msg_func, at_address msg_data) {
FILE *stream;
at_bitmap_type image = at_bitmap_init(0, 0, 0, 1);
at_exception_type exp = at_exception_new(msg_func, msg_data);
stream = fopen(filename, "rb");
if (!stream)
{
LOG1("Can't open \"%s\"\n", filename);
at_exception_fatal(&exp, "Cannot open input png file");
return image;
}
load_image(&image, stream, opts, &exp);
fclose(stream);
return image;
}
static png_bytep *
read_png(png_structp png_ptr, png_infop info_ptr, at_input_opts_type * opts)
{
int row;
png_color_16p original_bg;
png_color_16 my_bg;
png_read_info(png_ptr, info_ptr);
png_set_strip_16(png_ptr);
png_set_packing(png_ptr);
if ((png_ptr->bit_depth < 8) ||
(png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
(png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
png_set_expand(png_ptr);
if (png_get_bKGD(png_ptr, info_ptr, &original_bg)) {
/* Fill transparent region with ... */
my_bg.index = 0;
if (opts && opts->background_color) {
my_bg.red = 256 * opts->background_color->r;
my_bg.green = 256 * opts->background_color->g;
my_bg.blue = 256 * opts->background_color->b;
my_bg.gray = 256* ((opts->background_color->r
+ opts->background_color->g
+ opts->background_color->b) / 3);
} else
/* else, use white */
my_bg.red = my_bg.green = my_bg.blue = my_bg.gray = 0xFFFF;
png_set_background(png_ptr, &my_bg,
PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
} else
png_set_strip_alpha(png_ptr);
png_read_update_info(png_ptr, info_ptr);
info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
info_ptr->height * sizeof(png_bytep));
#ifdef PNG_FREE_ME_SUPPORTED
info_ptr->free_me |= PNG_FREE_ROWS;
#endif
for (row = 0; row < (int)info_ptr->height; row++)
info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
png_get_rowbytes(png_ptr, info_ptr));
png_read_image(png_ptr, info_ptr->row_pointers);
info_ptr->valid |= PNG_INFO_IDAT;
png_read_end(png_ptr, info_ptr);
return png_get_rows(png_ptr, info_ptr);
}
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