+++ /dev/null
-/*
- * Mesa 3-D graphics library
- * Version: 6.3
- *
- * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
- *
- * 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 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
- * BRIAN PAUL 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.
- */
-
-#include "glxheader.h"
-#include "main/context.h"
-#include "main/macros.h"
-#include "main/imports.h"
-#include "main/mtypes.h"
-#include "xmesaP.h"
-
-#include "swrast/swrast.h"
-
-
-/*
- * The following functions are used to trap XGetImage() calls which
- * generate BadMatch errors if the drawable isn't mapped.
- */
-
-static int caught_xgetimage_error = 0;
-static int (*old_xerror_handler)( XMesaDisplay *dpy, XErrorEvent *ev );
-static unsigned long xgetimage_serial;
-
-/*
- * This is the error handler which will be called if XGetImage fails.
- */
-static int xgetimage_error_handler( XMesaDisplay *dpy, XErrorEvent *ev )
-{
- if (ev->serial==xgetimage_serial && ev->error_code==BadMatch) {
- /* caught the expected error */
- caught_xgetimage_error = 0;
- }
- else {
- /* call the original X error handler, if any. otherwise ignore */
- if (old_xerror_handler) {
- (*old_xerror_handler)( dpy, ev );
- }
- }
- return 0;
-}
-
-
-/*
- * Call this right before XGetImage to setup error trap.
- */
-static void catch_xgetimage_errors( XMesaDisplay *dpy )
-{
- xgetimage_serial = NextRequest( dpy );
- old_xerror_handler = XSetErrorHandler( xgetimage_error_handler );
- caught_xgetimage_error = 0;
-}
-
-
-/*
- * Call this right after XGetImage to check if an error occured.
- */
-static int check_xgetimage_errors( void )
-{
- /* restore old handler */
- (void) XSetErrorHandler( old_xerror_handler );
- /* return 0=no error, 1=error caught */
- return caught_xgetimage_error;
-}
-
-
-/*
- * Read a pixel from an X drawable.
- */
-static unsigned long read_pixel( XMesaDisplay *dpy,
- XMesaDrawable d, int x, int y )
-{
- unsigned long p;
- XMesaImage *pixel = NULL;
- int error;
-
- catch_xgetimage_errors( dpy );
- pixel = XGetImage( dpy, d, x, y, 1, 1, AllPlanes, ZPixmap );
- error = check_xgetimage_errors();
- if (pixel && !error) {
- p = XMesaGetPixel( pixel, 0, 0 );
- }
- else {
- p = 0;
- }
- if (pixel) {
- XMesaDestroyImage( pixel );
- }
- return p;
-}
-
-
-
-/*
- * The Mesa library needs to be able to draw pixels in a number of ways:
- * 1. RGB vs Color Index
- * 2. as horizontal spans (polygons, images) vs random locations (points,
- * lines)
- * 3. different color per-pixel or same color for all pixels
- *
- * Furthermore, the X driver needs to support rendering to 3 possible
- * "buffers", usually one, but sometimes two at a time:
- * 1. The front buffer as an X window
- * 2. The back buffer as a Pixmap
- * 3. The back buffer as an XImage
- *
- * Finally, if the back buffer is an XImage, we can avoid using XPutPixel and
- * optimize common cases such as 24-bit and 8-bit modes.
- *
- * By multiplication, there's at least 48 possible combinations of the above.
- *
- * Below are implementations of the most commonly used combinations. They are
- * accessed through function pointers which get initialized here and are used
- * directly from the Mesa library. The 8 function pointers directly correspond
- * to the first 3 cases listed above.
- *
- *
- * The function naming convention is:
- *
- * [put|get]_[row|values]_[format]_[pixmap|ximage]
- *
- * New functions optimized for specific cases can be added without too much
- * trouble. An example might be the 24-bit TrueColor mode 8A8R8G8B which is
- * found on IBM RS/6000 X servers.
- */
-
-
-
-
-
-
-
-/**********************************************************************/
-/***** Pixel reading *****/
-/**********************************************************************/
-
-/**
- * Do clip testing prior to calling XGetImage. If any of the region lies
- * outside the screen's bounds, XGetImage will return NULL.
- * We use XTranslateCoordinates() to check if that's the case and
- * adjust the x, y and length parameters accordingly.
- * \return -1 if span is totally clipped away,
- * else return number of pixels to skip in the destination array.
- */
-static int
-clip_for_xgetimage(struct gl_context *ctx, XMesaPixmap pixmap, GLuint *n, GLint *x, GLint *y)
-{
- XMesaContext xmesa = XMESA_CONTEXT(ctx);
- XMesaBuffer source = XMESA_BUFFER(ctx->DrawBuffer);
- Window rootWin = RootWindow(xmesa->display, 0);
- Window child;
- GLint screenWidth = WidthOfScreen(DefaultScreenOfDisplay(xmesa->display));
- GLint dx, dy;
- if (source->type == PBUFFER || source->type == PIXMAP)
- return 0;
- XTranslateCoordinates(xmesa->display, pixmap, rootWin,
- *x, *y, &dx, &dy, &child);
- if (dx >= screenWidth) {
- /* totally clipped on right */
- return -1;
- }
- if (dx < 0) {
- /* clipped on left */
- GLint clip = -dx;
- if (clip >= (GLint) *n)
- return -1; /* totally clipped on left */
- *x += clip;
- *n -= clip;
- dx = 0;
- return clip;
- }
- if ((GLint) (dx + *n) > screenWidth) {
- /* clipped on right */
- GLint clip = dx + *n - screenWidth;
- *n -= clip;
- }
- return 0;
-}
-
-
-#define GET_XRB(XRB) \
- struct xmesa_renderbuffer *XRB = xmesa_renderbuffer(rb)
-
-
-
-
-
-/**
- * Initialize the renderbuffer's PutRow, GetRow, etc. functions.
- * This would generally only need to be called once when the renderbuffer
- * is created. However, we can change pixel formats on the fly if dithering
- * is enabled/disabled. Therefore, we may call this more often than that.
- */
-void
-xmesa_set_renderbuffer_funcs(struct xmesa_renderbuffer *xrb,
- enum pixel_format pixelformat, GLint depth)
-{
- /* XXX remove this */
-}
-
projects / mesa.git / commitdiff