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xserver-multidpi/hw/dmx/glxProxy/glxsingle.c
Alan Coopersmith 2704bdb24a DMX glxproxy: Don't allocate & copy data just to free it unused 
Two functions in the DMX glxproxy code loop over all the backend
screens, starting at the highest numbered and counting down to
the lowest.

Previously, for each screen, the code would allocate a buffer
large enough to read the reply from the backend, copy that reply
into the buffer, and then if it wasn't the final screen, free it.
Only the buffer from the final screen is used, to pass on to the
client in the reply.

This modifies it to just immediately discard the responses from
the screens as we loop through it, only doing the allocate & copy
work for the one buffer we pass back to the client.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Alex Deucher <aleander.deucher@amd.com>
2013-10-14 17:56:44 -07:00

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/* DO NOT EDIT - THIS FILE IS AUTOMATICALLY GENERATED */
/*
* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
* Copyright (C) 1991-2000 Silicon Graphics, Inc. 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 including the dates of first publication and
* either this permission notice or a reference to
* http://oss.sgi.com/projects/FreeB/
* 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
* SILICON GRAPHICS, INC. 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.
*
* Except as contained in this notice, the name of Silicon Graphics, Inc.
* shall not be used in advertising or otherwise to promote the sale, use or
* other dealings in this Software without prior written authorization from
* Silicon Graphics, Inc.
*/
#ifdef HAVE_DMX_CONFIG_H
#include <dmx-config.h>
#endif
#include "dmx.h"
#include "dmxwindow.h"
#include "dmxpixmap.h"
#include "dmxfont.h"
#include "dmxcb.h"
#include "glxserver.h"
#include "glxext.h"
#include "g_disptab.h"
/* #include "g_disptab_EXT.h" */
#include "unpack.h"
#include "glxutil.h"
#include "GL/glxproto.h"
#ifdef PANORAMIX
#include "panoramiXsrv.h"
#endif
/*
* GetReqSingle - this is the equivalent of GetReq macro
* from Xlibint.h but it does not set the reqType field (the opcode).
* this is because the GL single opcodes has different naming convension
* the other X opcodes (ie. X_GLsop_GetFloatv).
*/
#if (defined(__STDC__) && !defined(UNIXCPP)) || defined(ANSICPP)
#define GetReqSingle(name, req) \
WORD64ALIGN\
if ((dpy->bufptr + SIZEOF(x##name##Req)) > dpy->bufmax)\
_XFlush(dpy);\
req = (x##name##Req *)(dpy->last_req = dpy->bufptr);\
req->length = (SIZEOF(x##name##Req))>>2;\
dpy->bufptr += SIZEOF(x##name##Req);\
dpy->request++
#else /* non-ANSI C uses empty comment instead of "##" for token concatenation */
#define GetReqSingle(name, req) \
WORD64ALIGN\
if ((dpy->bufptr + SIZEOF(x/**/name/**/Req)) > dpy->bufmax)\
_XFlush(dpy);\
req = (x/**/name/**/Req *)(dpy->last_req = dpy->bufptr);\
req->length = (SIZEOF(x/**/name/**/Req))>>2;\
dpy->bufptr += SIZEOF(x/**/name/**/Req);\
dpy->request++
#endif
#define X_GLXSingle 0 /* needed by GetReqExtra */
extern Display *GetBackEndDisplay(__GLXclientState * cl, int s);
extern int GetCurrentBackEndTag(__GLXclientState * cl, GLXContextTag tag,
int s);
static int swap_vec_element_size = 0;
static void
SendSwappedReply(ClientPtr client,
xGLXSingleReply * reply, char *buf, int buf_size)
{
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_SWAP_SHORT(&reply->sequenceNumber);
__GLX_SWAP_INT(&reply->length);
__GLX_SWAP_INT(&reply->retval);
__GLX_SWAP_INT(&reply->size);
if ((buf_size == 0) && (swap_vec_element_size > 0)) {
/*
* the reply has single component - need to swap pad3
*/
if (swap_vec_element_size == 2) {
__GLX_SWAP_SHORT(&reply->pad3);
}
else if (swap_vec_element_size == 4) {
__GLX_SWAP_INT(&reply->pad3);
__GLX_SWAP_INT(&reply->pad4); /* some requests use also pad4
* i.e GetConvolutionFilter
*/
}
else if (swap_vec_element_size == 8) {
__GLX_SWAP_DOUBLE(&reply->pad3);
}
}
else if ((buf_size > 0) && (swap_vec_element_size > 0)) {
/*
* the reply has vector of elements which needs to be swapped
*/
int vsize = buf_size / swap_vec_element_size;
char *p = buf;
int i;
for (i = 0; i < vsize; i++) {
if (swap_vec_element_size == 2) {
__GLX_SWAP_SHORT(p);
}
else if (swap_vec_element_size == 4) {
__GLX_SWAP_INT(p);
}
else if (swap_vec_element_size == 8) {
__GLX_SWAP_DOUBLE(p);
}
p += swap_vec_element_size;
}
/*
* swap pad words as well - for case that some single reply uses
* them as well
*/
__GLX_SWAP_INT(&reply->pad3);
__GLX_SWAP_INT(&reply->pad4);
__GLX_SWAP_INT(&reply->pad5);
__GLX_SWAP_INT(&reply->pad6);
}
WriteToClient(client, sizeof(xGLXSingleReply), reply);
if (buf_size > 0)
WriteToClient(client, buf_size, buf);
}
int
__glXForwardSingleReq(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
xGLXSingleReq *be_req;
__GLXcontext *glxc;
int from_screen = 0;
int to_screen = 0;
int buf_size;
int s;
glxc = __glXLookupContextByTag(cl, req->contextTag);
if (!glxc) {
return 0;
}
from_screen = to_screen = glxc->pScreen->myNum;
#ifdef PANORAMIX
if (!noPanoramiXExtension) {
from_screen = 0;
to_screen = screenInfo.numScreens - 1;
}
#endif
pc += sz_xGLXSingleReq;
buf_size = (req->length << 2) - sz_xGLXSingleReq;
/*
* just forward the request to back-end server(s)
*/
for (s = from_screen; s <= to_screen; s++) {
DMXScreenInfo *dmxScreen = &dmxScreens[s];
Display *dpy = GetBackEndDisplay(cl, s);
LockDisplay(dpy);
GetReqSingle(GLXSingle, be_req);
be_req->reqType = dmxScreen->glxMajorOpcode;
be_req->glxCode = req->glxCode;
be_req->length = req->length;
be_req->contextTag = GetCurrentBackEndTag(cl, req->contextTag, s);
if (buf_size > 0)
_XSend(dpy, (const char *) pc, buf_size);
UnlockDisplay(dpy);
SyncHandle();
if (req->glxCode == X_GLsop_Flush) {
XFlush(dpy);
}
}
return Success;
}
int
__glXForwardPipe0WithReply(__GLXclientState * cl, GLbyte * pc)
{
ClientPtr client = cl->client;
xGLXSingleReq *req = (xGLXSingleReq *) pc;
xGLXSingleReq *be_req;
xGLXSingleReply reply;
xGLXSingleReply be_reply;
__GLXcontext *glxc;
int buf_size;
char *be_buf = NULL;
int be_buf_size;
DMXScreenInfo *dmxScreen;
Display *dpy;
glxc = __glXLookupContextByTag(cl, req->contextTag);
if (!glxc) {
return __glXBadContext;
}
pc += sz_xGLXSingleReq;
buf_size = (req->length << 2) - sz_xGLXSingleReq;
dmxScreen = &dmxScreens[glxc->pScreen->myNum];
dpy = GetBackEndDisplay(cl, glxc->pScreen->myNum);
/*
* send the request to the first back-end server
*/
LockDisplay(dpy);
GetReqSingle(GLXSingle, be_req);
be_req->reqType = dmxScreen->glxMajorOpcode;
be_req->glxCode = req->glxCode;
be_req->length = req->length;
be_req->contextTag =
GetCurrentBackEndTag(cl, req->contextTag, glxc->pScreen->myNum);
if (buf_size > 0)
_XSend(dpy, (const char *) pc, buf_size);
/*
* get the reply from the back-end server
*/
_XReply(dpy, (xReply *) &be_reply, 0, False);
be_buf_size = be_reply.length << 2;
if (be_buf_size > 0) {
be_buf = (char *) malloc(be_buf_size);
if (be_buf) {
_XRead(dpy, be_buf, be_buf_size);
}
else {
/* Throw data on the floor */
_XEatDataWords(dpy, be_reply.length);
return BadAlloc;
}
}
UnlockDisplay(dpy);
SyncHandle();
/*
* send the reply to the client
*/
reply = (xGLXSingleReply) {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = be_reply.length,
.retval = be_reply.retval,
.size = be_reply.size,
.pad3 = be_reply.pad3,
.pad4 = be_reply.pad4
};
if (client->swapped) {
SendSwappedReply(client, &reply, be_buf, be_buf_size);
}
else {
WriteToClient(client, sizeof(xGLXSingleReply), &reply);
if (be_buf_size > 0)
WriteToClient(client, be_buf_size, be_buf);
}
if (be_buf_size > 0)
free(be_buf);
return Success;
}
int
__glXForwardAllWithReply(__GLXclientState * cl, GLbyte * pc)
{
ClientPtr client = cl->client;
xGLXSingleReq *req = (xGLXSingleReq *) pc;
xGLXSingleReq *be_req;
xGLXSingleReply reply;
xGLXSingleReply be_reply;
__GLXcontext *glxc;
int buf_size;
char *be_buf = NULL;
int be_buf_size = 0;
int from_screen = 0;
int to_screen = 0;
int s;
DMXScreenInfo *dmxScreen;
Display *dpy;
glxc = __glXLookupContextByTag(cl, req->contextTag);
if (!glxc) {
return 0;
}
from_screen = to_screen = glxc->pScreen->myNum;
#ifdef PANORAMIX
if (!noPanoramiXExtension) {
from_screen = 0;
to_screen = screenInfo.numScreens - 1;
}
#endif
pc += sz_xGLXSingleReq;
buf_size = (req->length << 2) - sz_xGLXSingleReq;
/*
* send the request to the first back-end server(s)
*/
for (s = to_screen; s >= from_screen; s--) {
dmxScreen = &dmxScreens[s];
dpy = GetBackEndDisplay(cl, s);
LockDisplay(dpy);
GetReqSingle(GLXSingle, be_req);
be_req->reqType = dmxScreen->glxMajorOpcode;
be_req->glxCode = req->glxCode;
be_req->length = req->length;
be_req->contextTag = GetCurrentBackEndTag(cl, req->contextTag, s);
if (buf_size > 0)
_XSend(dpy, (const char *) pc, buf_size);
/*
* get the reply from the back-end server
*/
_XReply(dpy, (xReply *) &be_reply, 0, False);
if (s == from_screen) {
/* Save data from last reply to send on to client */
be_buf_size = be_reply.length << 2;
if (be_buf_size > 0) {
be_buf = malloc(be_buf_size);
if (be_buf) {
_XRead(dpy, be_buf, be_buf_size);
}
else {
/* Throw data on the floor */
_XEatDataWords(dpy, be_reply.length);
return BadAlloc;
}
}
}
else {
/* Just discard data from all replies before the last one */
if (be_reply.length > 0)
_XEatDataWords(dpy, be_reply.length);
}
UnlockDisplay(dpy);
SyncHandle();
}
/*
* send the reply to the client
*/
reply = (xGLXSingleReply) {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = be_reply.length,
.retval = be_reply.retval,
.size = be_reply.size,
.pad3 = be_reply.pad3,
.pad4 = be_reply.pad4
};
if (client->swapped) {
SendSwappedReply(client, &reply, be_buf, be_buf_size);
}
else {
WriteToClient(client, sizeof(xGLXSingleReply), &reply);
if (be_buf_size > 0)
WriteToClient(client, be_buf_size, be_buf);
}
if (be_buf_size > 0)
free(be_buf);
return Success;
}
int
__glXForwardSingleReqSwap(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 0;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardSingleReq(cl, pc));
}
int
__glXForwardPipe0WithReplySwap(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 0;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardPipe0WithReply(cl, pc));
}
int
__glXForwardPipe0WithReplySwapsv(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 2;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardPipe0WithReply(cl, pc));
}
int
__glXForwardPipe0WithReplySwapiv(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 4;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardPipe0WithReply(cl, pc));
}
int
__glXForwardPipe0WithReplySwapdv(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 8;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardPipe0WithReply(cl, pc));
}
int
__glXForwardAllWithReplySwap(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 0;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardAllWithReply(cl, pc));
}
int
__glXForwardAllWithReplySwapsv(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 2;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardAllWithReply(cl, pc));
}
int
__glXForwardAllWithReplySwapiv(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 4;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardAllWithReply(cl, pc));
}
int
__glXForwardAllWithReplySwapdv(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
__GLX_DECLARE_SWAP_VARIABLES;
__GLX_DECLARE_SWAP_ARRAY_VARIABLES;
__GLX_SWAP_SHORT(&req->length);
__GLX_SWAP_INT(&req->contextTag);
swap_vec_element_size = 8;
/*
* swap extra data in request - assuming all data
* (if available) are arrays of 4 bytes components !
*/
if (req->length > sz_xGLXSingleReq / 4) {
int *data = (int *) (req + 1);
int count = req->length - sz_xGLXSingleReq / 4;
__GLX_SWAP_INT_ARRAY(data, count);
}
return (__glXForwardAllWithReply(cl, pc));
}
static GLint
__glReadPixels_size(GLenum format, GLenum type, GLint w, GLint h,
int *elementbits_return, int *rowbytes_return)
{
GLint elements, esize;
GLint rowsize, padding;
if (w < 0 || h < 0) {
return -1;
}
switch (format) {
case GL_COLOR_INDEX:
case GL_STENCIL_INDEX:
case GL_DEPTH_COMPONENT:
elements = 1;
break;
case GL_RED:
case GL_GREEN:
case GL_BLUE:
case GL_ALPHA:
case GL_LUMINANCE:
elements = 1;
break;
case GL_LUMINANCE_ALPHA:
elements = 2;
break;
case GL_RGB:
case GL_BGR:
elements = 3;
break;
case GL_RGBA:
case GL_BGRA:
case GL_ABGR_EXT:
elements = 4;
break;
default:
return -1;
}
/*
** According to the GLX protocol, each row must be padded to a multiple of
** 4 bytes. 4 bytes also happens to be the default alignment in the pixel
** store modes of the GL.
*/
switch (type) {
case GL_BITMAP:
if (format == GL_COLOR_INDEX || format == GL_STENCIL_INDEX) {
rowsize = ((w * elements) + 7) / 8;
padding = rowsize % 4;
if (padding) {
rowsize += 4 - padding;
}
if (elementbits_return)
*elementbits_return = elements;
if (rowbytes_return)
*rowbytes_return = rowsize;
return rowsize * h;
}
else {
return -1;
}
case GL_BYTE:
case GL_UNSIGNED_BYTE:
esize = 1;
break;
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
esize = 1;
elements = 1;
break;
case GL_SHORT:
case GL_UNSIGNED_SHORT:
esize = 2;
break;
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_4_4_4_4_REV:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
esize = 2;
elements = 1;
break;
case GL_INT:
case GL_UNSIGNED_INT:
case GL_FLOAT:
esize = 4;
break;
case GL_UNSIGNED_INT_8_8_8_8:
case GL_UNSIGNED_INT_8_8_8_8_REV:
case GL_UNSIGNED_INT_10_10_10_2:
case GL_UNSIGNED_INT_2_10_10_10_REV:
esize = 4;
elements = 1;
break;
default:
return -1;
}
rowsize = w * elements * esize;
padding = rowsize % 4;
if (padding) {
rowsize += 4 - padding;
}
if (elementbits_return)
*elementbits_return = esize * elements * 8;
if (rowbytes_return)
*rowbytes_return = rowsize;
return rowsize * h;
}
static int
intersectRect(int x1, int x2, int y1, int y2,
int X1, int X2, int Y1, int Y2,
int *ix1, int *ix2, int *iy1, int *iy2)
{
int right = (x2 < X2 ? x2 : X2);
int bottom = (y2 < Y2 ? y2 : Y2);
int left = (x1 > X1 ? x1 : X1);
int top = (y1 > Y1 ? y1 : Y1);
int width = right - left + 1;
int height = bottom - top + 1;
if ((width <= 0) || (height <= 0)) {
*ix1 = *ix2 = *iy1 = *iy2 = 0;
return 0;
}
else {
*ix1 = left;
*ix2 = right;
*iy1 = top;
*iy2 = bottom;
return width * height;
}
}
int
__glXDisp_ReadPixels(__GLXclientState * cl, GLbyte * pc)
{
xGLXSingleReq *req = (xGLXSingleReq *) pc;
xGLXSingleReq *be_req;
xGLXReadPixelsReply reply;
xGLXReadPixelsReply be_reply;
GLbyte *be_pc;
GLint x, y;
GLsizei width, height;
GLenum format, type;
GLboolean swapBytes, lsbFirst;
ClientPtr client = cl->client;
DrawablePtr pDraw;
__GLXcontext *glxc;
int from_screen = 0;
int to_screen = 0;
char *buf;
int buf_size;
int s;
int win_x1, win_x2;
int win_y1, win_y2;
int ebits, rowsize;
__GLX_DECLARE_SWAP_VARIABLES;
if (client->swapped) {
__GLX_SWAP_INT(&req->contextTag);
}
glxc = __glXLookupContextByTag(cl, req->contextTag);
if (!glxc) {
return 0;
}
from_screen = to_screen = glxc->pScreen->myNum;
#ifdef PANORAMIX
if (!noPanoramiXExtension) {
from_screen = 0;
to_screen = screenInfo.numScreens - 1;
}
#endif
pc += sz_xGLXSingleReq;
x = *(GLint *) (pc + 0);
y = *(GLint *) (pc + 4);
width = *(GLsizei *) (pc + 8);
height = *(GLsizei *) (pc + 12);
format = *(GLenum *) (pc + 16);
type = *(GLenum *) (pc + 20);
swapBytes = *(GLboolean *) (pc + 24);
lsbFirst = *(GLboolean *) (pc + 25);
if (client->swapped) {
__GLX_SWAP_INT(&x);
__GLX_SWAP_INT(&y);
__GLX_SWAP_INT(&width);
__GLX_SWAP_INT(&height);
__GLX_SWAP_INT(&format);
__GLX_SWAP_INT(&type);
swapBytes = !swapBytes;
}
buf_size =
__glReadPixels_size(format, type, width, height, &ebits, &rowsize);
if (buf_size > 0) {
buf = (char *) malloc(buf_size);
if (!buf) {
return BadAlloc;
}
}
else {
buf_size = 0;
buf = NULL;
}
if (buf_size > 0) {
/*
* Get the current drawable this context is bound to
*/
pDraw = __glXLookupDrawableByTag(cl, req->contextTag);
win_x1 = pDraw->x + x;
win_x2 = win_x1 + width - 1;
win_y1 = (dmxGlobalHeight - pDraw->y - pDraw->height) + y;
win_y2 = win_y1 + height - 1;
if (pDraw->type != DRAWABLE_WINDOW) {
from_screen = to_screen = 0;
}
for (s = from_screen; s <= to_screen; s++) {
DMXScreenInfo *dmxScreen = &dmxScreens[s];
Display *dpy = GetBackEndDisplay(cl, s);
int scr_x1 = dmxScreen->rootXOrigin;
int scr_x2 = dmxScreen->rootXOrigin + dmxScreen->scrnWidth - 1;
int scr_y1 = dmxScreen->rootYOrigin;
int scr_y2 = dmxScreen->rootYOrigin + dmxScreen->scrnHeight - 1;
int wx1, wx2, wy1, wy2;
int sx, sy, sw, sh;
int npixels;
/*
* find the window portion that is on the current screen
*/
if (pDraw->type == DRAWABLE_WINDOW) {
npixels = intersectRect(scr_x1, scr_x2, scr_y1, scr_y2,
win_x1, win_x2, win_y1, win_y2,
&wx1, &wx2, &wy1, &wy2);
}
else {
wx1 = win_x1;
wx2 = win_x2;
wy1 = win_y1;
wy2 = win_y2;
npixels = (wx2 - wx1 + 1) * (wy2 - wy1 + 1);
}
if (npixels > 0) {
/* send the request to the back-end server */
LockDisplay(dpy);
GetReqExtra(GLXSingle, __GLX_PAD(26), be_req);
be_req->reqType = dmxScreen->glxMajorOpcode;
be_req->glxCode = X_GLsop_ReadPixels;
be_req->contextTag =
GetCurrentBackEndTag(cl, req->contextTag, s);
be_pc = ((GLbyte *) (be_req) + sz_xGLXSingleReq);
sx = wx1 - pDraw->x;
sy = wy1 - (dmxGlobalHeight - pDraw->y - pDraw->height);
sw = (wx2 - wx1 + 1);
sh = (wy2 - wy1 + 1);
*(GLint *) (be_pc + 0) = sx; /* x */
*(GLint *) (be_pc + 4) = sy; /* y */
*(GLsizei *) (be_pc + 8) = sw; /* width */
*(GLsizei *) (be_pc + 12) = sh; /* height */
*(GLenum *) (be_pc + 16) = format;
*(GLenum *) (be_pc + 20) = type;
*(GLboolean *) (be_pc + 24) = swapBytes;
*(GLboolean *) (be_pc + 25) = lsbFirst;
_XReply(dpy, (xReply *) &be_reply, 0, False);
if (be_reply.length > 0) {
char *be_buf;
int be_buf_size = be_reply.length << 2;
be_buf = (char *) malloc(be_buf_size);
if (be_buf) {
_XRead(dpy, be_buf, be_buf_size);
/* copy pixels data to the right location of the */
/* reply buffer */
if (type != GL_BITMAP) {
int pbytes = ebits / 8;
char *dst =
buf + (sy - y) * rowsize + (sx - x) * pbytes;
char *src = be_buf;
int pad = (pbytes * sw) % 4;
int r;
for (r = 0; r < sh; r++) {
memcpy(dst, src, pbytes * sw);
dst += rowsize;
src += (pbytes * sw + (pad ? 4 - pad : 0));
}
}
else {
/* this is a GL_BITMAP pixel type, should copy bits */
int r;
int src_rowsize = bits_to_bytes(sw * ebits);
int src_pad = src_rowsize % 4;
if (src_pad) {
src_rowsize += (4 - src_pad);
}
for (r = 0; r < sh; r++) {
unsigned char dst_mask = 0x80 >> (sx % 8);
unsigned char src_mask = 0x80;
char *dst =
buf + (sy - y + r) * rowsize + (sx - x) / 8;
char *src = be_buf + r * src_rowsize;
int b;
for (b = 0; b < sw * ebits; b++) {
if (*src & src_mask) {
*dst |= dst_mask;
}
else {
*dst &= ~dst_mask;
}
if (dst_mask > 1)
dst_mask >>= 1;
else {
dst_mask = 0x80;
dst++;
}
if (src_mask > 1)
src_mask >>= 1;
else {
src_mask = 0x80;
src++;
}
}
}
}
free(be_buf);
}
else {
/* Throw data on the floor */
_XEatDataWords(dpy, be_reply.length);
free(buf);
return BadAlloc;
}
}
UnlockDisplay(dpy);
SyncHandle();
} /* of npixels > 0 */
} /* of for loop */
} /* of if buf_size > 0 */
reply = (xGLXReadPixelsReply) {
.type = X_Reply,
.sequenceNumber = client->sequence,
.length = buf_size >> 2
};
if (client->swapped) {
__GLX_SWAP_SHORT(&reply.sequenceNumber);
__GLX_SWAP_INT(&reply.length);
}
WriteToClient(client, sizeof(xGLXReadPixelsReply), &reply);
if (buf_size > 0) {
WriteToClient(client, buf_size, buf);
free(buf);
}
return Success;
}
int
__glXDispSwap_GetTexImage(__GLXclientState * cl, GLbyte * pc)
{
__GLX_DECLARE_SWAP_VARIABLES;
GLbyte *lpc = pc;
lpc += sz_xGLXSingleReq;
__GLX_SWAP_INT(lpc + 0);
__GLX_SWAP_INT(lpc + 4);
__GLX_SWAP_INT(lpc + 8);
__GLX_SWAP_INT(lpc + 12);
/* reverse swapBytes */
*(GLboolean *) (lpc + 16) = !*(GLboolean *) (lpc + 16);
return (__glXForwardPipe0WithReplySwap(cl, pc));
}
int
__glXDispSwap_GetColorTable(__GLXclientState * cl, GLbyte * pc)
{
__GLX_DECLARE_SWAP_VARIABLES;
GLbyte *lpc = pc;
lpc += sz_xGLXSingleReq;
__GLX_SWAP_INT(lpc + 0);
__GLX_SWAP_INT(lpc + 4);
__GLX_SWAP_INT(lpc + 8);
/* reverse swapBytes */
*(GLboolean *) (lpc + 12) = !*(GLboolean *) (lpc + 12);
return (__glXForwardPipe0WithReplySwap(cl, pc));
}
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