From 4f139db92fb283792adae8d39a49a083e4382fb5 Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Thu, 20 Aug 2009 14:43:43 -0700
Subject: [PATCH] glamor: Add getspans implementation.

---
 glamor/Makefile.am       |  1 +
 glamor/glamor.c          |  4 +++
 glamor/glamor_getspans.c | 74 ++++++++++++++++++++++++++++++++++++++++
 glamor/glamor_priv.h     | 10 ++++++
 4 files changed, 89 insertions(+)
 create mode 100644 glamor/glamor_getspans.c

diff --git a/glamor/Makefile.am b/glamor/Makefile.am
index b6a64fbe2..2d9fdf57c 100644
--- a/glamor/Makefile.am
+++ b/glamor/Makefile.am
@@ -18,4 +18,5 @@ libglamor_la_SOURCES = \
 	glamor_core.c \
 	glamor_fill.c \
 	glamor_fillspans.c \
+	glamor_getspans.c \
 	glamor.h
diff --git a/glamor/glamor.c b/glamor/glamor.c
index 050dd3d66..0aa9db83b 100644
--- a/glamor/glamor.c
+++ b/glamor/glamor.c
@@ -123,6 +123,9 @@ glamor_init(ScreenPtr screen)
     glamor_priv->saved_destroy_pixmap = screen->DestroyPixmap;
     screen->DestroyPixmap = glamor_destroy_pixmap;
 
+    glamor_priv->saved_get_spans = screen->GetSpans;
+    screen->GetSpans = glamor_get_spans;
+
     glamor_init_solid_shader(screen);
 
     return TRUE;
@@ -141,4 +144,5 @@ glamor_fini(ScreenPtr screen)
     screen->CreateGC = glamor_priv->saved_create_gc;
     screen->CreatePixmap = glamor_priv->saved_create_pixmap;
     screen->DestroyPixmap = glamor_priv->saved_destroy_pixmap;
+    screen->GetSpans = glamor_priv->saved_get_spans;
 }
diff --git a/glamor/glamor_getspans.c b/glamor/glamor_getspans.c
new file mode 100644
index 000000000..b10a29dcd
--- /dev/null
+++ b/glamor/glamor_getspans.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright © 2009 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include "glamor_priv.h"
+
+void
+glamor_get_spans(DrawablePtr drawable,
+		 int wmax,
+		 DDXPointPtr points,
+		 int *widths,
+		 int count,
+		 char *dst)
+{
+    ScreenPtr screen = drawable->pScreen;
+    PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
+    PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+
+    if (screen_pixmap != pixmap) {
+	fbGetSpans(drawable, wmax, points, widths, count, dst);
+	return;
+    } else {
+	GLenum format, type;
+	int i;
+	switch (drawable->depth) {
+	case 24:
+	case 32:
+	    format = GL_BGRA;
+	    type = GL_UNSIGNED_INT_8_8_8_8_REV;
+	    break;
+	default:
+	    ErrorF("Unknown getspans depth %d\n", drawable->depth);
+	    return;
+	}
+	if (!glamor_set_destination_pixmap(pixmap))
+	    return;
+	for (i = 0; i < count; i++) {
+	    glReadPixels(points[i].x - pixmap->screen_x,
+			 points[i].y - pixmap->screen_y,
+			 widths[i],
+			 1,
+			 format, type,
+			 dst);
+	    dst += PixmapBytePad(widths[i], drawable->depth);
+	}
+    }
+}
diff --git a/glamor/glamor_priv.h b/glamor/glamor_priv.h
index 3216a7a4a..016a404bc 100644
--- a/glamor/glamor_priv.h
+++ b/glamor/glamor_priv.h
@@ -42,6 +42,7 @@ typedef struct glamor_screen_private {
     CreateGCProcPtr saved_create_gc;
     CreatePixmapProcPtr saved_create_pixmap;
     DestroyPixmapProcPtr saved_destroy_pixmap;
+    GetSpansProcPtr saved_get_spans;
 
     /* glamor_solid */
     GLint solid_prog;
@@ -102,4 +103,13 @@ void glamor_fill_spans(DrawablePtr drawable,
 
 void glamor_init_solid_shader(ScreenPtr screen);
 
+/* glamor_getspans.c */
+void
+glamor_get_spans(DrawablePtr drawable,
+		 int wmax,
+		 DDXPointPtr points,
+		 int *widths,
+		 int nspans,
+		 char *dst_start);
+
 #endif /* GLAMOR_PRIV_H */