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144 lines
3.7 KiB
144 lines
3.7 KiB
--- vnc_unixsrc.orig/vncviewer/cursor.c 2003-01-15 04:46:52.000000000 -0500
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+++ vnc_unixsrc/vncviewer/cursor.c 2005-02-05 12:28:10.000000000 -0500
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@@ -472,6 +472,140 @@
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int offset, bytesPerPixel;
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char *pos;
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+#define alphahack
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+#ifdef alphahack
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+ /* hack to have cursor transparency at 32bpp <runge@karlrunge.com> */
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+ static int alphablend = -1;
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+
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+ if (alphablend < 0) {
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+ /* you have to set NO_ALPHABLEND=1 in your environment to disable */
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+ if (getenv("NO_ALPHABLEND")) {
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+ alphablend = 0;
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+ } else {
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+ alphablend = 1;
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+ }
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+ }
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+
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+ bytesPerPixel = myFormat.bitsPerPixel / 8;
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+
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+ if (alphablend && bytesPerPixel == 4) {
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+ unsigned long pixel, put, *upos, *upix;
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+ int got_alpha = 0, rsX, rsY, rsW, rsH;
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+ static XImage *image = NULL;
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+ static int iwidth = 128;
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+
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+ if (! image) {
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+ /* watch out for tiny fb (rare) */
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+ if (iwidth > si.framebufferWidth) {
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+ iwidth = si.framebufferWidth;
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+ }
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+ if (iwidth > si.framebufferHeight) {
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+ iwidth = si.framebufferHeight;
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+ }
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+
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+ /* initialize an XImage with a chunk of desktopWin */
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+ image = XGetImage(dpy, desktopWin, 0, 0, iwidth, iwidth,
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+ AllPlanes, ZPixmap);
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+ }
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+
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+ /* first check if there is any non-zero alpha channel data at all: */
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+ for (y = 0; y < rcHeight; y++) {
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+ for (x = 0; x < rcWidth; x++) {
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+ int alpha;
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+
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+ offset = y * rcWidth + x;
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+ pos = (char *)&rcSource[offset * bytesPerPixel];
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+
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+ upos = (unsigned long *) pos;
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+ alpha = (*upos & 0xff000000) >> 24;
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+ if (alpha) {
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+ got_alpha = 1;
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+ break;
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+ }
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+ }
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+ if (got_alpha) {
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+ break;
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+ }
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+ }
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+
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+ if (!got_alpha) {
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+ /* no alpha channel data, fallback to the old way */
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+ goto oldway;
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+ }
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+
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+ /* load the saved fb patch in to image (faster way?) */
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+ XGetSubImage(dpy, rcSavedArea, 0, 0, rcWidth, rcHeight,
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+ AllPlanes, ZPixmap, image, 0, 0);
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+ upix = (unsigned long *)image->data;
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+
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+ /* if the richcursor is clipped, the fb patch will be smaller */
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+ rsW = rcWidth;
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+ rsX = 0; /* used to denote a shift from the left side */
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+ x = rcCursorX - rcHotX;
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+ if (x < 0) {
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+ rsW += x;
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+ rsX = -x;
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+ } else if (x + rsW > si.framebufferWidth) {
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+ rsW = si.framebufferWidth - x;
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+ }
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+ rsH = rcHeight;
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+ rsY = 0; /* used to denote a shift from the top side */
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+ y = rcCursorY - rcHotY;
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+ if (y < 0) {
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+ rsH += y;
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+ rsY = -y;
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+ } else if (y + rsH > si.framebufferHeight) {
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+ rsH = si.framebufferHeight - y;
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+ }
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+
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+ /*
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+ * now loop over the cursor data, blend in the fb values,
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+ * and then overwrite the fb (CopyDataToScreen())
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+ */
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+ for (y = 0; y < rcHeight; y++) {
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+ y0 = rcCursorY - rcHotY + y;
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+ if (y0 < 0 || y0 >= si.framebufferHeight) {
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+ continue; /* clipped */
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+ }
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+ for (x = 0; x < rcWidth; x++) {
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+ int alpha, color_curs, color_fb, i;
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+
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+ x0 = rcCursorX - rcHotX + x;
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+ if (x0 < 0 || x0 >= si.framebufferWidth) {
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+ continue; /* clipped */
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+ }
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+
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+ offset = y * rcWidth + x;
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+ pos = (char *)&rcSource[offset * bytesPerPixel];
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+
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+ /* extract secret alpha byte from rich cursor: */
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+ upos = (unsigned long *) pos;
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+ alpha = (*upos & 0xff000000) >> 24; /* XXX MSB? */
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+
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+ /* extract the pixel from the fb: */
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+ pixel = *(upix + (y-rsY)*iwidth + (x-rsX));
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+
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+ put = 0;
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+ /* for simplicity, blend all 4 bytes */
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+ for (i = 0; i < 4; i++) {
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+ int sh = i*8;
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+ color_curs = ((0xff << sh) & *upos) >> sh;
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+ color_fb = ((0xff << sh) & pixel) >> sh;
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+
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+ /* XXX assumes pre-multipled color_curs */
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+ color_fb = color_curs
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+ + ((0xff - alpha) * color_fb)/0xff;
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+ put |= color_fb << sh;
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+ }
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+ /* place in the fb: */
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+ CopyDataToScreen((char *)&put, x0, y0, 1, 1);
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+ }
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+ }
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+ return;
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+ }
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+oldway:
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+#endif
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+
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bytesPerPixel = myFormat.bitsPerPixel / 8;
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/* FIXME: Speed optimization is possible. */
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