#include "config.h"
/* include X11 stuff */
#include <X11/Xlib.h>
/* include Imlib2 stuff */
#include <Imlib2.h>
/* needed for sprintf and fprintf */
#include <stdio.h>
/* needed for getenv */
#include <stdlib.h>
/* some globals for our window & X display */
Display *disp;
Window win;
Visual *vis;
Colormap cm;
int depth;
/* the program... */
int
main(int argc, char **argv)
{
/* events we get from X */
XEvent ev;
/* areas to update */
Imlib_Updates updates, current_update;
/* our virtual framebuffer image we draw into */
Imlib_Image buffer;
/* a font */
Imlib_Font font;
/* our color range */
Imlib_Color_Range range;
/* our mouse x, y coordinates */
int mouse_x = 0, mouse_y = 0;
const char *display_name = getenv("DISPLAY");
/* connect to X */
if (!display_name)
display_name = ":0";
disp = XOpenDisplay(display_name);
if (!disp)
{
fprintf(stderr, "Can't open display %s\n", display_name);
return 1;
}
/* get default visual , colormap etc. you could ask imlib2 for what it */
/* thinks is the best, but this example is intended to be simple */
vis = DefaultVisual(disp, DefaultScreen(disp));
depth = DefaultDepth(disp, DefaultScreen(disp));
cm = DefaultColormap(disp, DefaultScreen(disp));
/* create a window 640x480 */
win = XCreateSimpleWindow(disp, DefaultRootWindow(disp),
0, 0, 640, 480, 0, 0, 0);
/* tell X what events we are interested in */
XSelectInput(disp, win, ButtonPressMask | ButtonReleaseMask |
PointerMotionMask | ExposureMask);
/* show the window */
XMapWindow(disp, win);
/* set our cache to 2 Mb so it doesn't have to go hit the disk as long as */
/* the images we use use less than 2Mb of RAM (that is uncompressed) */
imlib_set_cache_size(2048 * 1024);
/* set the font cache to 512Kb - again to avoid re-loading */
imlib_set_font_cache_size(512 * 1024);
/* add the ./ttfonts dir to our font path - you'll want a notepad.ttf */
/* in that dir for the text to display */
imlib_add_path_to_font_path(PACKAGE_DATA_DIR "/data/fonts");
/* set the maximum number of colors to allocate for 8bpp and less to 128 */
imlib_set_color_usage(128);
/* dither for depths < 24bpp */
imlib_context_set_dither(1);
/* set the display , visual, colormap and drawable we are using */
imlib_context_set_display(disp);
imlib_context_set_visual(vis);
imlib_context_set_colormap(cm);
imlib_context_set_drawable(win);
/* infinite event loop */
for (;;)
{
/* image variable */
Imlib_Image image;
/* width and height values */
int w, h, text_w, text_h;
/* init our updates to empty */
updates = imlib_updates_init();
/* while there are events form X - handle them */
do
{
XNextEvent(disp, &ev);
switch (ev.type)
{
case Expose:
/* window rectangle was exposed - add it to the list of */
/* rectangles we need to re-render */
updates = imlib_update_append_rect(updates,
ev.xexpose.x,
ev.xexpose.y,
ev.xexpose.width,
ev.xexpose.height);
break;
case ButtonPress:
/* if we click anywhere in the window, exit */
exit(0);
break;
case MotionNotify:
/* if the mouse moves - note it */
/* add a rectangle update for the new mouse position */
image =
imlib_load_image(PACKAGE_DATA_DIR "/data/images/mush.png");
imlib_context_set_image(image);
w = imlib_image_get_width();
h = imlib_image_get_height();
imlib_context_set_image(image);
imlib_free_image();
/* the old position - so we wipe over where it used to be */
updates = imlib_update_append_rect(updates,
mouse_x - (w / 2),
mouse_y - (h / 2), w, h);
font = imlib_load_font("notepad/30");
if (font)
{
char text[4096];
imlib_context_set_font(font);
sprintf(text, "Mouse is at %i, %i", mouse_x, mouse_y);
imlib_get_text_size(text, &text_w, &text_h);
imlib_free_font();
updates = imlib_update_append_rect(updates,
320 - (text_w / 2),
240 - (text_h / 2),
text_w, text_h);
}
mouse_x = ev.xmotion.x;
mouse_y = ev.xmotion.y;
/* the new one */
updates = imlib_update_append_rect(updates,
mouse_x - (w / 2),
mouse_y - (h / 2), w, h);
font = imlib_load_font("notepad/30");
if (font)
{
char text[4096];
imlib_context_set_font(font);
sprintf(text, "Mouse is at %i, %i", mouse_x, mouse_y);
imlib_get_text_size(text, &text_w, &text_h);
imlib_free_font();
updates = imlib_update_append_rect(updates,
320 - (text_w / 2),
240 - (text_h / 2),
text_w, text_h);
}
default:
/* any other events - do nothing */
break;
}
}
while (XPending(disp));
/* no more events for now ? ok - idle time so lets draw stuff */
/* take all the little rectangles to redraw and merge them into */
/* something sane for rendering */
updates = imlib_updates_merge_for_rendering(updates, 640, 480);
for (current_update = updates;
current_update;
current_update = imlib_updates_get_next(current_update))
{
int up_x, up_y, up_w, up_h;
/* find out where the first update is */
imlib_updates_get_coordinates(current_update,
&up_x, &up_y, &up_w, &up_h);
/* create our buffer image for renderign this update */
buffer = imlib_create_image(up_w, up_h);
/* we can blend stuff now */
imlib_context_set_blend(1);
/* fill the window background */
/* load the background image - you'll need to have some images */
/* in ./test_images lying around for this to actually work */
image = imlib_load_image(PACKAGE_DATA_DIR "/data/images/bg.png");
/* we're working with this image now */
imlib_context_set_image(image);
/* get its size */
w = imlib_image_get_width();
h = imlib_image_get_height();
/* now we want to work with the buffer */
imlib_context_set_image(buffer);
/* if the iimage loaded */
if (image)
{
/* blend image onto the buffer and scale it to 640x480 */
imlib_blend_image_onto_image(image, 0,
0, 0, w, h,
-up_x, -up_y, 640, 480);
/* working with the loaded image */
imlib_context_set_image(image);
/* free it */
imlib_free_image();
}
/* draw an icon centered around the mouse position */
image = imlib_load_image(PACKAGE_DATA_DIR "/data/images/mush.png");
imlib_context_set_image(image);
w = imlib_image_get_width();
h = imlib_image_get_height();
imlib_context_set_image(buffer);
if (image)
{
imlib_blend_image_onto_image(image, 0,
0, 0, w, h,
mouse_x - (w / 2) - up_x,
mouse_y - (h / 2) - up_y, w, h);
imlib_context_set_image(image);
imlib_free_image();
}
/* draw a gradient on top of things at the top left of the window */
/* create a range */
range = imlib_create_color_range();
imlib_context_set_color_range(range);
/* add white opaque as the first color */
imlib_context_set_color(255, 255, 255, 255);
imlib_add_color_to_color_range(0);
/* add an orange color, semi-transparent 10 units from the first */
imlib_context_set_color(255, 200, 10, 100);
imlib_add_color_to_color_range(10);
/* add black, fully transparent at the end 20 units away */
imlib_context_set_color(0, 0, 0, 0);
imlib_add_color_to_color_range(20);
/* draw the range */
imlib_context_set_image(buffer);
imlib_image_fill_color_range_rectangle(-up_x, -up_y, 128, 128,
-45.0);
/* free it */
imlib_free_color_range();
/* draw text - centered with the current mouse x, y */
font = imlib_load_font("notepad/30");
if (font)
{
char text[4096];
/* set the current font */
imlib_context_set_font(font);
/* set the image */
imlib_context_set_image(buffer);
/* set the color (black) */
imlib_context_set_color(0, 0, 0, 255);
/* print text to display in the buffer */
sprintf(text, "Mouse is at %i, %i", mouse_x, mouse_y);
/* query the size it will be */
imlib_get_text_size(text, &text_w, &text_h);
/* draw it */
imlib_text_draw(320 - (text_w / 2) - up_x,
240 - (text_h / 2) - up_y, text);
/* free the font */
imlib_free_font();
}
/* dont blend the image onto the drawable - slower */
imlib_context_set_blend(0);
/* set the buffer image as our current image */
imlib_context_set_image(buffer);
/* render the image at 0, 0 */
imlib_render_image_on_drawable(up_x, up_y);
/* don't need that temproary buffer image anymore */
imlib_free_image();
}
/* if we had updates - free them */
if (updates)
imlib_updates_free(updates);
/* loop again waiting for events */
}
return 0;
}