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Diffstat (limited to 'xorg-server/miext/shadow/shiplan2p4.c')
-rw-r--r--xorg-server/miext/shadow/shiplan2p4.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/xorg-server/miext/shadow/shiplan2p4.c b/xorg-server/miext/shadow/shiplan2p4.c
new file mode 100644
index 000000000..0e46bae7a
--- /dev/null
+++ b/xorg-server/miext/shadow/shiplan2p4.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright © 2013 Geert Uytterhoeven
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Based on shpacked.c, which is Copyright © 2000 Keith Packard
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <stdlib.h>
+
+#include <X11/X.h>
+#include "scrnintstr.h"
+#include "windowstr.h"
+#include <X11/fonts/font.h>
+#include "dixfontstr.h"
+#include <X11/fonts/fontstruct.h>
+#include "mi.h"
+#include "regionstr.h"
+#include "globals.h"
+#include "gcstruct.h"
+#include "shadow.h"
+#include "fb.h"
+#include "c2p_core.h"
+
+
+ /*
+ * Perform a full C2P step on 16 4-bit pixels, stored in 2 32-bit words
+ * containing
+ * - 16 4-bit chunky pixels on input
+ * - permutated planar data (2 planes per 32-bit word) on output
+ */
+
+static void c2p_16x4(CARD32 d[2])
+{
+ transp2(d, 8);
+ transp2(d, 2);
+ transp2x(d, 1);
+ transp2(d, 16);
+ transp2(d, 4);
+ transp2(d, 1);
+}
+
+
+ /*
+ * Store a full block of iplan2p4 data after c2p conversion
+ */
+
+static inline void store_iplan2p4(void *dst, const CARD32 d[2])
+{
+ CARD32 *p = dst;
+
+ *p++ = d[0];
+ *p++ = d[1];
+}
+
+
+void
+shadowUpdateIplan2p4(ScreenPtr pScreen, shadowBufPtr pBuf)
+{
+ RegionPtr damage = shadowDamage(pBuf);
+ PixmapPtr pShadow = pBuf->pPixmap;
+ int nbox = RegionNumRects(damage);
+ BoxPtr pbox = RegionRects(damage);
+ FbBits *shaBase;
+ CARD16 *shaLine, *sha;
+ FbStride shaStride;
+ int scrLine;
+ _X_UNUSED int shaBpp, shaXoff, shaYoff;
+ int x, y, w, h;
+ int i, n;
+ CARD16 *win;
+ _X_UNUSED CARD32 winSize;
+ union {
+ CARD8 bytes[8];
+ CARD32 words[2];
+ } d;
+
+ fbGetDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
+ shaYoff);
+ shaStride *= sizeof(FbBits) / sizeof(CARD16);
+
+ while (nbox--) {
+ x = pbox->x1;
+ y = pbox->y1;
+ w = pbox->x2 - pbox->x1;
+ h = pbox->y2 - pbox->y1;
+
+ scrLine = (x & -16) / 2;
+ shaLine = (CARD16 *)shaBase + y * shaStride + scrLine / sizeof(CARD16);
+
+ n = ((x & 15) + w + 15) / 16; /* number of c2p units in scanline */
+
+ while (h--) {
+ sha = shaLine;
+ win = (CARD16 *) (*pBuf->window) (pScreen,
+ y,
+ scrLine,
+ SHADOW_WINDOW_WRITE,
+ &winSize,
+ pBuf->closure);
+ if (!win)
+ return;
+ for (i = 0; i < n; i++) {
+ memcpy(d.bytes, sha, sizeof(d.bytes));
+ c2p_16x4(d.words);
+ store_iplan2p4(win, d.words);
+ sha += sizeof(d.bytes) / sizeof(*sha);
+ win += sizeof(d.bytes) / sizeof(*win);
+ }
+ shaLine += shaStride;
+ y++;
+ }
+ pbox++;
+ }
+}