From 63191bd244f18fd78bebb9586d2b85ab9d5b38e2 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Thu, 5 Nov 2009 16:48:50 -0700 Subject: [PATCH] xmesa: pass pixmap to clip_for_xgetimage() The code was assuming ctx->DrawBuffer == ctx->ReadBuffer. Passing the pixmap is simpler and better. Fixes a potential segfault. --- src/mesa/drivers/x11/xm_span.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/mesa/drivers/x11/xm_span.c b/src/mesa/drivers/x11/xm_span.c index 309cefcb8e8..c39d87c4516 100644 --- a/src/mesa/drivers/x11/xm_span.c +++ b/src/mesa/drivers/x11/xm_span.c @@ -3773,7 +3773,7 @@ static void put_values_ci_ximage( PUT_VALUES_ARGS ) * else return number of pixels to skip in the destination array. */ static int -clip_for_xgetimage(GLcontext *ctx, GLuint *n, GLint *x, GLint *y) +clip_for_xgetimage(GLcontext *ctx, XMesaPixmap pixmap, GLuint *n, GLint *x, GLint *y) { XMesaContext xmesa = XMESA_CONTEXT(ctx); XMesaBuffer source = XMESA_BUFFER(ctx->DrawBuffer); @@ -3783,7 +3783,7 @@ clip_for_xgetimage(GLcontext *ctx, GLuint *n, GLint *x, GLint *y) GLint dx, dy; if (source->type == PBUFFER || source->type == PIXMAP) return 0; - XTranslateCoordinates(xmesa->display, source->frontxrb->pixmap, rootWin, + XTranslateCoordinates(xmesa->display, pixmap, rootWin, *x, *y, &dx, &dy, &child); if (dx >= screenWidth) { /* totally clipped on right */ @@ -3827,7 +3827,7 @@ get_row_ci(GLcontext *ctx, struct gl_renderbuffer *rb, #ifndef XFree86Server XMesaImage *span = NULL; int error; - int k = clip_for_xgetimage(ctx, &n, &x, &y); + int k = clip_for_xgetimage(ctx, xrb->pixmap, &n, &x, &y); if (k < 0) return; index += k; @@ -3892,7 +3892,7 @@ get_row_rgba(GLcontext *ctx, struct gl_renderbuffer *rb, #else int k; y = YFLIP(xrb, y); - k = clip_for_xgetimage(ctx, &n, &x, &y); + k = clip_for_xgetimage(ctx, xrb->pixmap, &n, &x, &y); if (k < 0) return; rgba += k; -- 2.30.2