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| -rw-r--r-- | src/xlib.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/xlib.c b/src/xlib.c new file mode 100644 index 0000000..e781835 --- /dev/null +++ b/src/xlib.c @@ -0,0 +1,179 @@ + +#include <assert.h> +#include <stdio.h> +#include <stdlib.h> + +#include <X11/Xlib.h> +#include <X11/Xutil.h> +#include <X11/keysym.h> + +#include "meh.h" + +/* Globals */ +Display *display; +int screen; +Window window; +GC gc; + +static unsigned int getshift(unsigned int mask){ +#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) + return __builtin_ctz(mask); +#else + int i = 0; + while((mask & 1) == 0){ + i++; + mask >>= 1; + } + return i; +#endif +} + +XImage *ximage(struct image *img, int width, int height) { + int depth; + XImage *ximg = NULL; + Visual *vis; + unsigned int rshift, gshift, bshift; + int i; + int x,y; + + depth = DefaultDepth(display, screen); + vis = DefaultVisual(display, screen); + + rshift = getshift(vis->red_mask); + gshift = getshift(vis->green_mask); + bshift = getshift(vis->blue_mask); + + if (depth >= 24) { + unsigned int dx; + size_t numNewBufBytes = (4 * width * height); + u_int32_t *newBuf = malloc(numNewBufBytes); + + dx = 1024 * img->width / width; + for(y = 0; y < height; y++){ + i = (y * img->height / height * img->width) * 1024; + for(x = 0; x < width; x++){ + unsigned int r, g, b; + r = (img->buf[(i >> 10)*3] << rshift) & vis->red_mask; + g = (img->buf[(i >> 10)*3+1] << gshift) & vis->green_mask; + b = (img->buf[(i >> 10)*3+2] << bshift) & vis->blue_mask; + + newBuf[y * width + x] = r | g | b; + i += dx; + } + } + + ximg = XCreateImage (display, + CopyFromParent, depth, + ZPixmap, 0, + (char *) newBuf, + width, height, + 32, 0 + ); + }else if(depth >= 15){ + unsigned int dx; + size_t numNewBufBytes = (2 * width * height); + u_int16_t *newBuf = malloc (numNewBufBytes); + + dx = 1024 * img->width / width; + for(y = 0; y < height; y++){ + i = (y * img->height / height * img->width) * 1024; + for(x = 0; x < width; x++){ + unsigned int r, g, b; + r = (img->buf[i++] << rshift) & vis->red_mask; + g = (img->buf[i++] << gshift) & vis->green_mask; + b = (img->buf[i++] << bshift) & vis->blue_mask; + + newBuf[y * width + x] = r | g | b; + i += dx; + } + } + + ximg = XCreateImage(display, + CopyFromParent, depth, + ZPixmap, 0, + (char *) newBuf, + width, height, + 16, 0 + ); + }else{ + fprintf(stderr, "This program does not support displays with a depth less than 15.\n"); + exit(1); + return NULL; + } + + XInitImage(ximg); + + return ximg; +} + + +void drawimage(struct image *img, int width, int height){ + static struct image *lastimg = NULL; + static int lastwidth = 0, lastheight = 0; + static XImage *ximg = NULL; + if(img == lastimg && width == lastwidth && height == lastheight){ + }else{ + if(ximg) + XDestroyImage(ximg); + lastwidth = width; + lastheight = height; + lastimg = img; + if(width * img->height > height * img->width){ + ximg = ximage(img, img->width * height / img->height, height); + }else{ + ximg = ximage(img, width, img->height * width / img->width); + } + } + assert(ximg); + { + XRectangle rects[2]; + int yoffset, xoffset; + xoffset = (width - ximg->width) / 2; + yoffset = (height - ximg->height) / 2; + if(xoffset || yoffset){ + rects[0].x = rects[0].y = 0; + if(xoffset){ + rects[0].width = rects[1].width = xoffset; + rects[0].height = rects[1].height = height; + rects[1].x = width-xoffset; + rects[1].y = 0; + }else if(yoffset){ + rects[0].width = rects[1].width = width; + rects[0].height = rects[1].height = yoffset; + rects[1].x = 0; + rects[1].y = height - yoffset; + } + XFillRectangles(display, window, gc, rects, 2); + } + XPutImage(display, window, gc, ximg, 0, 0, xoffset, yoffset, ximg->width, ximg->height); + XFlush(display); + } +} + + +void setaspect(int w, int h){ + XSizeHints *hints = XAllocSizeHints(); + hints->flags = PAspect; + hints->min_aspect.x = hints->max_aspect.x = w; + hints->min_aspect.y = hints->max_aspect.y = h; + XSetWMNormalHints(display, window, hints); + XFlush(display); + XFree(hints); +} + +void xinit(){ + display = XOpenDisplay (NULL); + assert(display); + screen = DefaultScreen(display); + + window = XCreateWindow(display, DefaultRootWindow(display), 0, 0, 640, 480, 0, DefaultDepth(display, screen), InputOutput, CopyFromParent, 0, NULL); + setaspect(1, 1); + gc = XCreateGC(display, window, 0, NULL); + + XMapRaised(display, window); + XSelectInput(display, window, StructureNotifyMask | ExposureMask | KeyPressMask); + XFlush(display); +} + + + |