+/* minirgb -- simple rgb buffer drawing library for 16, 24 and 32 bit displays
+ * Copyright (C) 2000 timecop@japan.co.jp
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include "minirgb.h"
+
+#undef MAX
+#define MAX(a, b) (((a) > (b)) ? (a) : (b))
+
+/* local variables */
+Display *minirgb_display; /* display */
+Visual *minirgb_visual; /* visual */
+int minirgb_depth; /* display depth */
+int minirgb_ok = 0; /* init ok? */
+
+/* local prototypes */
+static __inline void rgb_conv_16(unsigned char *ptr, unsigned char r, unsigned char g, unsigned char b, XImage *image);
+static __inline void rgb_conv_24(unsigned char *ptr, unsigned char r, unsigned char g, unsigned char b, XImage *image);
+static __inline void rgb_conv_32(unsigned char *ptr, unsigned char r, unsigned char g, unsigned char b, XImage *image);
+
+static __inline void rgb_conv_16(unsigned char *ptr, unsigned char r, unsigned char g, unsigned char b, XImage *image)
+{
+ if (image->green_mask & 0x7e0) /* 565 */
+ *(unsigned short int *)ptr = ((r >> 3) << 11) |
+ ((g >> 2) << 5) |
+ (b >> 3);
+ else /* 555 untested */
+ *(unsigned short int *)ptr = ((r >> 3) << 11) |
+ ((g >> 3) << 6) |
+ (b >> 3);
+}
+
+static __inline void rgb_conv_24(unsigned char *ptr, unsigned char r, unsigned char g, unsigned char b, XImage *image)
+{
+ /* untested */
+ *ptr++ = r;
+ *ptr++ = g;
+ *ptr = b;
+}
+
+static __inline void rgb_conv_32(unsigned char *ptr, unsigned char r, unsigned char g, unsigned char b, XImage *image)
+{
+ if (image->red_mask & 0xff0000) /* 0888 */
+ *(unsigned int *)ptr = (r << 16) |
+ (g << 8) |
+ (b);
+ else /* 8880 untested */
+ *(unsigned int *)ptr = (r << 24) |
+ (g << 16) |
+ (b << 8);
+}
+
+int minirgb_init(Display *d)
+{
+ int screen;
+
+ minirgb_display = d;
+ screen = DefaultScreen(minirgb_display);
+ minirgb_visual = XDefaultVisual(minirgb_display, screen);
+ minirgb_depth = XDefaultDepth(minirgb_display, screen);
+ if (minirgb_depth <= 8) {
+ fprintf(stderr, "minirgb: No support for 8 bit displays\n");
+ minirgb_ok = 0;
+ return 1;
+ } else {
+ minirgb_ok = 1;
+ return 0;
+ }
+}
+
+void minirgb_setpixel(MiniRGB *rgb_image, unsigned char *color, unsigned int x, unsigned int y)
+{
+ unsigned char *ptr;
+
+ ptr = rgb_image->mem + (y * rgb_image->rowstride * 3) + (x * 3);
+ *ptr++ = *color++;
+ *ptr++ = *color++;
+ *ptr = *color;
+}
+
+void minirgb_copy(MiniRGB *from, MiniRGB *to,
+ unsigned int sx, unsigned int sy, unsigned int w, unsigned int h,
+ unsigned int dx, unsigned int dy)
+{
+ unsigned int i;
+ unsigned char *src, *dest;
+
+#ifdef VERBOSE
+ fprintf(stderr, "minirgb: copy %d, %d (%dx%d) -> %d, %d)\n", sx, sy, w, h, dx, dy);
+#endif
+
+#if 0
+ if (w == 1) { /* special case - dot operations */
+ src = from->mem + (sy * from->rowstride * 3) + sx * 3;
+ dest = to->mem + (dy * to->rowstride * 3) + dx * 3;
+ dest[0] = dest[0] & src[0];
+ dest[1] = dest[1] & src[1];
+ dest[2] = dest[2] & src[2];
+ return;
+ }
+#endif
+
+ for (i = 0; i < h; i++) {
+ src = from->mem + ((sy + i) * from->rowstride * 3) + sx * 3;
+ dest = to->mem + ((dy + i) * to->rowstride * 3) + dx * 3;
+ memcpy(dest, src, w * 3);
+ }
+}
+
+void minirgb_new(MiniRGB *image, unsigned int width, unsigned int height)
+{
+ image->width = width;
+ image->height = height;
+ image->rowstride = width;
+ image->mem = calloc(1, width * height * 3);
+}
+
+void minirgb_draw(Window drawable, GC gc, int x, int y, int width,
+ int height, MiniRGB *rgb_image)
+{
+ XImage *image = NULL;
+ unsigned int bpp;
+ unsigned int x0, y0;
+ unsigned char *ptr, *col;
+ void (*conv) (unsigned char *, unsigned char, unsigned char, unsigned char, XImage *) = NULL;
+
+ if (!minirgb_ok)
+ return;
+
+ image = XCreateImage(minirgb_display, minirgb_visual, minirgb_depth, ZPixmap, 0, 0, width, height, 32, 0);
+ bpp = (image->bits_per_pixel + 7) / 8;
+ switch (bpp) {
+ case 2:
+ conv = rgb_conv_16;
+ break;
+ case 3:
+ conv = rgb_conv_24;
+ break;
+ case 4:
+ conv = rgb_conv_32;
+ break;
+ }
+#ifdef VERBOSE
+ printf("minirgb: image %p %dx%d (bpp: %d, bpl: %d)\n", image, width, height, bpp, image->bytes_per_line);
+#endif
+ image->data = malloc(image->bytes_per_line * height);
+ if (!image->data) {
+ fprintf(stderr, "minirgb: allocation error\n");
+ XDestroyImage(image);
+ return;
+ }
+
+ for (y0 = 0; y0 < height; y0++) {
+ for (x0 = 0; x0 < width; x0++) {
+ col = rgb_image->mem + (y0 * rgb_image->rowstride * 3 + x0 * 3);
+ ptr = image->data + (y0 * image->bytes_per_line + x0 * bpp);
+ conv(ptr, col[0], col[1], col[2], image);
+ }
+ }
+ /* draw image onto drawable */
+ XPutImage(minirgb_display, drawable, gc, image, 0, 0, x, y, width, height);
+ XDestroyImage(image);
+}