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#include <X11/Xlib.h>
#include "wraster.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
Display *dpy;
Window win;
RContext *ctx;
RImage *imgh, *imgv, *imgd;
Pixmap pix;
char *ProgName;
void print_help()
{
printf("usage: %s [-options] color1 [color2 ...]\n", ProgName);
puts("options:");
puts(" -m match colors");
puts(" -d dither colors (default)");
puts(" -c <cpc> colors per channel to use");
puts(" -v <vis-id> visual id to use");
}
int main(int argc, char **argv)
{
RContextAttributes attr;
RColor **colors = NULL;
int i, rmode = RDitheredRendering, ncolors = 0, cpc = 4;
char **color_name;
XColor color;
XSetWindowAttributes val;
int visualID = -1;
ProgName = strrchr(argv[0], '/');
if (!ProgName)
ProgName = argv[0];
else
ProgName++;
color_name = (char **)malloc(sizeof(char *) * argc);
if (color_name == NULL) {
fprintf(stderr, "Cannot allocate memory!\n");
exit(1);
}
if (argc > 1) {
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-m") == 0) {
rmode = RBestMatchRendering;
} else if (strcmp(argv[i], "-d") == 0) {
rmode = RDitheredRendering;
} else if (strcmp(argv[i], "-c") == 0) {
i++;
if (i >= argc) {
fprintf(stderr, "too few arguments for %s\n", argv[i - 1]);
exit(0);
}
if (sscanf(argv[i], "%i", &cpc) != 1) {
fprintf(stderr, "bad value for colors per channel: \"%s\"\n", argv[i]);
exit(0);
}
} else if (strcmp(argv[i], "-v") == 0) {
i++;
if (i >= argc) {
fprintf(stderr, "too few arguments for %s\n", argv[i - 1]);
exit(0);
}
if (sscanf(argv[i], "%i", &visualID) != 1) {
fprintf(stderr, "bad value for visual ID: \"%s\"\n", argv[i]);
exit(0);
}
} else if (argv[i][0] != '-') {
color_name[ncolors++] = argv[i];
} else {
print_help();
exit(1);
}
}
}
if (ncolors == 0) {
print_help();
exit(1);
}
dpy = XOpenDisplay("");
if (!dpy) {
puts("cant open display");
exit(1);
}
attr.flags = RC_RenderMode | RC_ColorsPerChannel;
attr.render_mode = rmode;
attr.colors_per_channel = cpc;
if (visualID >= 0) {
attr.flags |= RC_VisualID;
attr.visualid = visualID;
}
ctx = RCreateContext(dpy, DefaultScreen(dpy), &attr);
if (!ctx) {
printf("could not initialize graphics library context: %s\n", RMessageForError(RErrorCode));
exit(1);
}
colors = malloc(sizeof(RColor *) * (ncolors + 1));
for (i = 0; i < ncolors; i++) {
if (!XParseColor(dpy, ctx->cmap, color_name[i], &color)) {
printf("could not parse color \"%s\"\n", color_name[i]);
exit(1);
} else {
colors[i] = malloc(sizeof(RColor));
colors[i]->red = color.red >> 8;
colors[i]->green = color.green >> 8;
colors[i]->blue = color.blue >> 8;
printf("0x%02x%02x%02x\n", colors[i]->red, colors[i]->green, colors[i]->blue);
}
}
colors[i] = NULL;
val.background_pixel = ctx->black;
val.colormap = ctx->cmap;
val.backing_store = Always;
win = XCreateWindow(dpy, DefaultRootWindow(dpy), 10, 10, 750, 250,
0, ctx->depth, InputOutput, ctx->visual,
CWColormap | CWBackPixel | CWBackingStore, &val);
XMapRaised(dpy, win);
XFlush(dpy);
imgh = RRenderMultiGradient(250, 250, colors, RGRD_HORIZONTAL);
imgv = RRenderMultiGradient(250, 250, colors, RGRD_VERTICAL);
imgd = RRenderMultiGradient(250, 250, colors, RGRD_DIAGONAL);
RConvertImage(ctx, imgh, &pix);
XCopyArea(dpy, pix, win, ctx->copy_gc, 0, 0, 250, 250, 0, 0);
RReleaseImage(imgh);
RConvertImage(ctx, imgv, &pix);
XCopyArea(dpy, pix, win, ctx->copy_gc, 0, 0, 250, 250, 250, 0);
RReleaseImage(imgv);
RConvertImage(ctx, imgd, &pix);
XCopyArea(dpy, pix, win, ctx->copy_gc, 0, 0, 250, 250, 500, 0);
RReleaseImage(imgd);
XFlush(dpy);
getchar();
free(color_name);
for (i = 0; i < ncolors + 1; i++)
free(colors[i]);
free(colors);
RDestroyContext(ctx);
RShutdown();
XCloseDisplay(dpy);
return 0;
}
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