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/*
* Start up graphics processing. Anything that needs to be assigned, set up,
* started-up, or otherwise initialized happens here. This is called only at
* the startup of the graphics driver.
*
* The external variables define the pixle limits of the graphics surface. The
* coordinate system used by the applications programs has the (0,0) origin
* in the upper left-hand corner. Hence,
* screen_left < screen_right
* screen_top < screen_bottom
*/
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef __MINGW32__
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#endif
#include <grass/gis.h>
#include "pngdriver.h"
char *file_name;
int currentColor;
int true_color;
int auto_write;
int has_alpha;
int mapped;
int clip_top, clip_bot, clip_left, clip_rite;
int width, height;
void *image;
unsigned int *grid;
unsigned char png_palette[256][4];
unsigned int background;
int modified;
static void map_file(void)
{
#ifndef __MINGW32__
size_t size = HEADER_SIZE + width * height * sizeof(unsigned int);
void *ptr;
int fd;
fd = open(file_name, O_RDWR);
if (fd < 0)
return;
ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, (off_t) 0);
if (ptr == MAP_FAILED)
return;
if (grid)
G_free(grid);
grid = (int *)((char *)ptr + HEADER_SIZE);
close(fd);
mapped = 1;
#endif
}
int PNG_Graph_set(int argc, char **argv)
{
unsigned int red, grn, blu;
int do_read = 0;
int do_map = 0;
char *p;
G_gisinit("PNG driver");
p = getenv("GRASS_PNGFILE");
if (!p || strlen(p) == 0)
p = FILE_NAME;
file_name = p;
p = getenv("GRASS_TRUECOLOR");
true_color = p && strcmp(p, "TRUE") == 0;
G_message("PNG: GRASS_TRUECOLOR status: %s",
true_color ? "TRUE" : "FALSE");
p = getenv("GRASS_PNG_AUTO_WRITE");
auto_write = p && strcmp(p, "TRUE") == 0;
p = getenv("GRASS_PNG_MAPPED");
do_map = p && strcmp(p, "TRUE") == 0;
if (do_map) {
char *ext = file_name + strlen(file_name) - 4;
if (G_strcasecmp(ext, ".bmp") != 0)
do_map = 0;
}
p = getenv("GRASS_PNG_READ");
do_read = p && strcmp(p, "TRUE") == 0;
if (do_read && access(file_name, 0) != 0)
do_read = 0;
width = screen_right - screen_left;
height = screen_bottom - screen_top;
clip_top = screen_top;
clip_bot = screen_bottom;
clip_left = screen_left;
clip_rite = screen_right;
p = getenv("GRASS_TRANSPARENT");
has_alpha = p && strcmp(p, "TRUE") == 0;
init_color_table();
p = getenv("GRASS_BACKGROUNDCOLOR");
if (p && *p && sscanf(p, "%02x%02x%02x", &red, &grn, &blu) == 3)
background = get_color(red, grn, blu, has_alpha ? 255 : 0);
else {
/* 0xffffff = white, 0x000000 = black */
if (strcmp(DEFAULT_FG_COLOR, "white") == 0)
/* foreground: white, background: black */
background = get_color(0, 0, 0, has_alpha ? 255 : 0);
else
/* foreground: black, background: white */
background = get_color(255, 255, 255, has_alpha ? 255 : 0);
}
G_message
("PNG: collecting to file: %s,\n GRASS_WIDTH=%d, GRASS_HEIGHT=%d",
file_name, width, height);
if (do_read && do_map)
map_file();
if (!mapped)
grid = G_malloc(width * height * sizeof(unsigned int));
if (!do_read) {
PNG_Erase();
modified = 1;
}
if (do_read && !mapped)
read_image();
if (do_map && !mapped) {
write_image();
map_file();
}
return 0;
}
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