Shadow: Add support for Amiga afb4
Add support for Amiga-style bitplanes, with 4 bits per pixel. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Keith Packard <keithp@keithp.com>
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Geert Uytterhoeven
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a1b8e7f1e6
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@ -9,6 +9,7 @@ endif
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libshadow_la_SOURCES = \
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shadow.c \
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shadow.h \
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shafb4.c \
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shalloc.c \
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shiplan2p4.c \
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shiplan2p8.c \
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@ -95,6 +95,9 @@ shadowInit(ScreenPtr pScreen, ShadowUpdateProc update, ShadowWindowProc window);
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extern _X_EXPORT void *shadowAlloc(int width, int height, int bpp);
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extern _X_EXPORT void
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shadowUpdateAfb4(ScreenPtr pScreen, shadowBufPtr pBuf);
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extern _X_EXPORT void
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shadowUpdateIplan2p4(ScreenPtr pScreen, shadowBufPtr pBuf);
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@ -0,0 +1,139 @@
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/*
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*
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* Copyright © 2013 Geert Uytterhoeven
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of Geert Uytterhoeven not be used in
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* advertising or publicity pertaining to distribution of the software without
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* specific, written prior permission. Geert Uytterhoeven makes no
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* representations about the suitability of this software for any purpose. It
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* is provided "as is" without express or implied warranty.
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*
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* GEERT UYTTERHOEVEN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL GEERT UYTTERHOEVEN BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* Based on shpacked.c, which is Copyright © 2000 Keith Packard
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <stdlib.h>
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#include <X11/X.h>
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#include "scrnintstr.h"
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#include "windowstr.h"
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#include <X11/fonts/font.h>
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#include "dixfontstr.h"
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#include <X11/fonts/fontstruct.h>
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#include "mi.h"
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#include "regionstr.h"
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#include "globals.h"
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#include "gcstruct.h"
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#include "shadow.h"
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#include "fb.h"
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#include "c2p_core.h"
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/*
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* Perform a full C2P step on 32 4-bit pixels, stored in 4 32-bit words
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* containing
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* - 32 4-bit chunky pixels on input
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* - permutated planar data (1 plane per 32-bit word) on output
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*/
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static void c2p_32x4(CARD32 d[4])
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{
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transp4(d, 16, 2);
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transp4(d, 8, 1);
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transp4(d, 4, 2);
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transp4(d, 2, 1);
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transp4(d, 1, 2);
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}
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/*
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* Store a full block of permutated planar data after c2p conversion
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*/
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static inline void store_afb4(void *dst, unsigned int stride,
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const CARD32 d[4])
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{
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CARD8 *p = dst;
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*(CARD32 *)p = d[3]; p += stride;
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*(CARD32 *)p = d[1]; p += stride;
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*(CARD32 *)p = d[2]; p += stride;
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*(CARD32 *)p = d[0]; p += stride;
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}
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void
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shadowUpdateAfb4(ScreenPtr pScreen, shadowBufPtr pBuf)
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{
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RegionPtr damage = shadowDamage(pBuf);
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PixmapPtr pShadow = pBuf->pPixmap;
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int nbox = RegionNumRects(damage);
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BoxPtr pbox = RegionRects(damage);
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FbBits *shaBase;
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CARD32 *shaLine, *sha;
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FbStride shaStride;
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int scrLine;
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_X_UNUSED int shaBpp, shaXoff, shaYoff;
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int x, y, w, h;
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int i, n;
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CARD32 *win;
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CARD32 off, winStride;
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union {
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CARD8 bytes[16];
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CARD32 words[4];
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} d;
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fbGetDrawable(&pShadow->drawable, shaBase, shaStride, shaBpp, shaXoff,
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shaYoff);
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if (sizeof(FbBits) != sizeof(CARD32))
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shaStride = shaStride * sizeof(FbBits) / sizeof(CARD32);
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while (nbox--) {
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x = pbox->x1;
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y = pbox->y1;
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w = pbox->x2 - pbox->x1;
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h = pbox->y2 - pbox->y1;
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scrLine = (x & -32) / 2;
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shaLine = (CARD32 *)shaBase + y * shaStride + scrLine / sizeof(CARD32);
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off = scrLine / 4; /* byte offset in bitplane scanline */
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n = ((x & 31) + w + 31) / 32; /* number of c2p units in scanline */
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while (h--) {
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sha = shaLine;
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win = (CARD32 *) (*pBuf->window) (pScreen,
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y,
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off,
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SHADOW_WINDOW_WRITE,
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&winStride,
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pBuf->closure);
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if (!win)
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return;
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for (i = 0; i < n; i++) {
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memcpy(d.bytes, sha, sizeof(d.bytes));
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c2p_32x4(d.words);
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store_afb4(win++, winStride, d.words);
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sha += sizeof(d.bytes) / sizeof(*sha);
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}
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shaLine += shaStride;
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y++;
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}
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pbox++;
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}
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}
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