From 4fdc23ce6db68b76b0d978dcf6b8d6b84b5f72fe Mon Sep 17 00:00:00 2001
From: Will Thompson <will@willthompson.co.uk>
Date: Wed, 9 May 2012 19:08:43 +0100
Subject: exa: stash memory allocated in PrepareAccess

FinishAccess doesn't get to peek at devPrivate.ptr, so we need to stash
the blob of memory we allocated in PrepareAccess so we can get at it
from FinishAccess. (Not that we use it yet.)
---
 src/videocore-exa.c | 41 +++++++++++++++++++++++++++--------------
 1 file changed, 27 insertions(+), 14 deletions(-)

diff --git a/src/videocore-exa.c b/src/videocore-exa.c
index f58b4ac..c401706 100644
--- a/src/videocore-exa.c
+++ b/src/videocore-exa.c
@@ -242,6 +242,12 @@ typedef struct _VideoCorePixmapPriv {
 	EGLint global_image[5];
 	EGLImageKHR egl_image;
 	GLuint texture_id;
+
+	/* Blob of memory backing the pixmap. If is_screen_pixmap || texture_id
+	 * != 0, only set between PrepareAccess and FinishAccess. Otherwise,
+	 * allocated in ModifyPixmapHeader and freed in DestroyPixmap.
+	 */
+	void *data;
 } VideoCorePixmapPrivRec, *VideoCorePixmapPrivPtr;
 
 static void *
@@ -397,7 +403,13 @@ VideoCoreModifyPixmapHeader(PixmapPtr pPixmap, int width, int height,
 
 	if (bitsPerPixel != 32) {
 		DEBUG_MSG("Can't accelerate pixmap %p with bpp %u", pPixmap, bitsPerPixel);
-		pPixmap->devPrivate.ptr = malloc(pPixmap->devKind * height);
+		/* FIXME: we'll presumably need to free previously-allocated
+		 * blobs at some point if we're modifying a pixmap */
+		priv->data = malloc(pPixmap->devKind * height);
+		if (priv->data == NULL) {
+			WARNING_MSG("can't allocate %u * %u bytes", pPixmap->devKind, height);
+		}
+		pPixmap->devPrivate.ptr = priv->data;
 		return TRUE; /* ??? */
 	}
 
@@ -432,6 +444,7 @@ VideoCoreDestroyPixmap(ScreenPtr pScreen, void *driverPriv)
 	VideoCorePixmapPrivPtr priv = driverPriv;
 
 	DestroyGlobalImage(vcExa, pScrn, priv);
+	free(priv->data);
 
 	free(priv);
 }
@@ -470,7 +483,6 @@ VideoCorePrepareAccess(PixmapPtr pPixmap, int index)
 	VideoCorePixmapPrivPtr priv = exaGetPixmapDriverPrivate(pPixmap);
 	ScrnInfoPtr pScrn = pix2scrn(pPixmap);
 	unsigned short width, height;
-	pointer data;
 
 	DEBUG_MSG("called for pixmap %p, is_screen_pixmap %s, texture %u, index %u",
 		  pPixmap,
@@ -484,23 +496,27 @@ VideoCorePrepareAccess(PixmapPtr pPixmap, int index)
 
 	width = pPixmap->drawable.width;
 	height = pPixmap->drawable.height;
-	assert (pPixmap->drawable.bitsPerPixel / 8 == 4);
 
-	data = malloc(width * height * 4);
-	if (!data) {
+	/* If we're here, this had better be an XRGB pixmap */
+	assert (pPixmap->drawable.bitsPerPixel / 8 == 4);
+	/* And we shouldn't get here more than once at a time */
+	assert (priv->data == NULL);
+	priv->data = malloc(width * height * 4);
+	if (!priv->data) {
 		ERROR_MSG("couldn't allocate %hu * %hu * 4 bytes!",
 			  width, height);
 		return FALSE;
 	}
 
-	ReadPixels(pScrn, priv->texture_id, 0, 0, width, height, data, 0 /* FIXME: pitch */);
+	ReadPixels(pScrn, priv->texture_id, 0, 0, width, height, priv->data, 0 /* FIXME: pitch */);
 	if (!CheckGLError(pScrn, "PrepareAccess:ReadPixels")) {
-		free(data);
+		free(priv->data);
+		priv->data = NULL;
 		return FALSE;
 	}
 
-	pPixmap->devPrivate.ptr = data;
-	DEBUG_MSG("allocated %p for pixmap %p", data, pPixmap);
+	pPixmap->devPrivate.ptr = priv->data;
+	DEBUG_MSG("allocated %p for pixmap %p", priv->data, pPixmap);
 	return TRUE;
 }
 
@@ -510,7 +526,6 @@ VideoCoreFinishAccess(PixmapPtr pPixmap, int index)
 	VideoCorePixmapPrivPtr priv = exaGetPixmapDriverPrivate(pPixmap);
 	ScrnInfoPtr pScrn = pix2scrn(pPixmap);
 	unsigned short width, height;
-	pointer data;
 
 	if (!priv->is_screen_pixmap) {
 		WARNING_MSG("called for a pixmap other than the screen!");
@@ -522,13 +537,11 @@ VideoCoreFinishAccess(PixmapPtr pPixmap, int index)
 	width = pPixmap->drawable.width;
 	height = pPixmap->drawable.height;
 
-	data = pPixmap->devPrivate.ptr;
-	assert(data != NULL);
-	pPixmap->devPrivate.ptr = NULL;
+	assert(priv->data != NULL);
 
 	/* FIXME: shade me up */
 	(void) (width + height);
-	free(data);
+	free(priv->data);
 
 	CheckGLError(pScrn, "FinishAccess:glDrawPixels");
 }
-- 
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