226 lines
4.7 KiB
C
226 lines
4.7 KiB
C
/*
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* Add ability to load xpm files to gd, requires the xpm
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* library.
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* Caolan.McNamara@ul.ie
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* http://www.csn.ul.ie/~caolan
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*/
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/**
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* File: XPM Input
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*
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* Read XPM images.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "gd.h"
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#include "gdhelpers.h"
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#include "gd_color_map.h"
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#include "gd_errors.h"
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#ifndef HAVE_LIBXPM
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BGD_DECLARE(gdImagePtr) gdImageCreateFromXpm(char *filename)
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{
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(void)filename;
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gd_error_ex(GD_ERROR, "libgd was not built with xpm support\n");
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return NULL;
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}
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#else
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#include <X11/xpm.h>
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/*
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Function: gdImageCreateFromXpm
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<gdImageCreateFromXbm> is called to load images from XPM X Window
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System color bitmap format files. This function is available only
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if HAVE_XPM is selected in the Makefile and the Xpm library is
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linked with the application. Unlike most gd file functions, the
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Xpm functions *require filenames*, not file
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pointers. <gdImageCreateFromXpm> returns a <gdImagePtr> to the new
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image, or NULL if unable to load the image (most often because the
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file is corrupt or does not contain an XPM bitmap format
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image). You can inspect the sx and sy members of the image to
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determine its size. The image must eventually be destroyed using
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<gdImageDestroy>.
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Parameters:
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filename - The input filename (*not* FILE pointer)
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Returns:
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A pointer to the new image or NULL if an error occurred.
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Example:
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(start code)
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gdImagePtr im;
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FILE *in;
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in = fopen("myxpm.xpm", "rb");
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im = gdImageCreateFromXpm(in);
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fclose(in);
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// ... Use the image ...
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gdImageDestroy(im);
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(end code)
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*/
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BGD_DECLARE(gdImagePtr) gdImageCreateFromXpm(char *filename)
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{
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XpmInfo info;
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XpmImage image;
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unsigned int i, j, k, number, len;
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char buf[5];
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gdImagePtr im = 0;
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int *pointer;
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int red = 0, green = 0, blue = 0;
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int *colors;
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int ret;
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ret = XpmReadFileToXpmImage(filename, &image, &info);
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if(ret != XpmSuccess) {
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return 0;
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}
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number = image.ncolors;
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if(overflow2(sizeof(int), number)) {
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goto done;
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}
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for(i = 0; i < number; i++) {
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/*
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avoid NULL pointer dereference
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TODO better fix need to manage monochrome/monovisual
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see m_color or g4_color or g_color
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*/
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if (!image.colorTable[i].c_color) {
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goto done;
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}
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}
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colors = (int *)gdMalloc(sizeof(int) * number);
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if(colors == NULL) {
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goto done;
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}
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if(!(im = gdImageCreate(image.width, image.height))) {
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gdFree(colors);
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goto done;
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}
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for(i = 0; i < number; i++) {
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char *c_color = image.colorTable[i].c_color;
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if(strcmp(c_color, "None") == 0) {
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colors[i] = gdImageGetTransparent(im);
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if(colors[i] == -1) colors[i] = gdImageColorAllocate(im, 0, 0, 0);
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if(colors[i] != -1) gdImageColorTransparent(im, colors[i]);
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continue;
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}
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len = strlen(c_color);
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if(len < 1) continue;
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if(c_color[0] == '#') {
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switch(len) {
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case 4:
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buf[2] = '\0';
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buf[0] = buf[1] = c_color[1];
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red = strtol(buf, NULL, 16);
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buf[0] = buf[1] = c_color[2];
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green = strtol(buf, NULL, 16);
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buf[0] = buf[1] = c_color[3];
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blue = strtol(buf, NULL, 16);
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break;
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case 7:
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buf[2] = '\0';
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buf[0] = c_color[1];
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buf[1] = c_color[2];
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red = strtol(buf, NULL, 16);
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buf[0] = c_color[3];
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buf[1] = c_color[4];
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green = strtol(buf, NULL, 16);
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buf[0] = c_color[5];
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buf[1] = c_color[6];
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blue = strtol(buf, NULL, 16);
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break;
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case 10:
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buf[3] = '\0';
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buf[0] = c_color[1];
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buf[1] = c_color[2];
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buf[2] = c_color[3];
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red = strtol(buf, NULL, 16);
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red /= 64;
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buf[0] = c_color[4];
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buf[1] = c_color[5];
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buf[2] = c_color[6];
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green = strtol(buf, NULL, 16);
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green /= 64;
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buf[0] = c_color[7];
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buf[1] = c_color[8];
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buf[2] = c_color[9];
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blue = strtol(buf, NULL, 16);
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blue /= 64;
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break;
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case 13:
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buf[4] = '\0';
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buf[0] = c_color[1];
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buf[1] = c_color[2];
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buf[2] = c_color[3];
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buf[3] = c_color[4];
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red = strtol(buf, NULL, 16);
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red /= 256;
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buf[0] = c_color[5];
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buf[1] = c_color[6];
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buf[2] = c_color[7];
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buf[3] = c_color[8];
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green = strtol(buf, NULL, 16);
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green /= 256;
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buf[0] = c_color[9];
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buf[1] = c_color[10];
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buf[2] = c_color[11];
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buf[3] = c_color[12];
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blue = strtol(buf, NULL, 16);
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blue /= 256;
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break;
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}
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} else if(!gdColorMapLookup(GD_COLOR_MAP_X11, c_color, &red, &green, &blue)) {
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continue;
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}
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colors[i] = gdImageColorResolve(im, red, green, blue);
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}
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pointer = (int *)image.data;
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for(i = 0; i < image.height; i++) {
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for(j = 0; j < image.width; j++) {
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k = *pointer++;
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gdImageSetPixel(im, j, i, colors[k]);
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}
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}
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gdFree(colors);
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done:
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XpmFreeXpmImage(&image);
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XpmFreeXpmInfo(&info);
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return im;
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}
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#endif /* HAVE_LIBXPM */
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