From 544dd4b11f7be76bb00fe29a60eaf2772dcc69ca Mon Sep 17 00:00:00 2001
From: Zack Rusin <zackr@vmware.com>
Date: Fri, 1 May 2009 12:41:38 -0400
Subject: OpenVG 1.0 State Tracker

Import of the OpenVG 1.0 state tracker for Gallium.
---
 progs/openvg/trivial/readpixels.c | 75 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 progs/openvg/trivial/readpixels.c

(limited to 'progs/openvg/trivial/readpixels.c')

diff --git a/progs/openvg/trivial/readpixels.c b/progs/openvg/trivial/readpixels.c
new file mode 100644
index 0000000000..c8e286db9a
--- /dev/null
+++ b/progs/openvg/trivial/readpixels.c
@@ -0,0 +1,75 @@
+#include "eglcommon.h"
+
+#include <VG/openvg.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+float red_color[4] = {1.0, 0.0, 0.0, 1.0};
+float blue_color[4] = {0.0, 0.0, 1.0, 1.0};
+VGint *data;
+
+static void
+init(void)
+{
+   data = malloc(sizeof(VGint)*2048*2048);
+}
+
+/* new window size or exposure */
+static void
+reshape(int w, int h)
+{
+   vgLoadIdentity();
+}
+
+static void
+draw(void)
+{
+   static const VGint red_pixel  = 255 << 24 | 255 << 16 | 0 << 8 |   0;
+   static const VGint blue_pixel = 255 << 24 |   0 << 16 | 0 << 8 | 255;
+   VGint i;
+
+   vgSetfv(VG_CLEAR_COLOR, 4, red_color);
+   vgClear(0, 0, window_width(), window_height());
+   vgFlush();
+
+   memset(data, 0, window_width() * window_height() * sizeof(VGint));
+
+   vgReadPixels(data, window_width() * sizeof(VGint),
+                VG_lARGB_8888,
+                0, 0, window_width(), window_height());
+
+   fprintf(stderr, "Red 0 = 0x%x and at 600 = 0x%x\n",
+           data[0], data[600]);
+   for (i = 0; i < window_width() * window_height(); ++i) {
+      assert(data[i] == red_pixel);
+   }
+
+   vgSetfv(VG_CLEAR_COLOR, 4, blue_color);
+   vgClear(50, 50, 50, 50);
+   vgFlush();
+
+   memset(data, 0, window_width() * window_height() * sizeof(VGint));
+
+   vgReadPixels(data, 50 * sizeof(VGint),
+                VG_lARGB_8888,
+                50, 50, 50, 50);
+
+   fprintf(stderr, "Blue 0 = 0x%x and at 100 = 0x%x\n",
+           data[0], data[100]);
+   for (i = 0; i < 50 * 50; ++i) {
+      assert(data[i] == blue_pixel);
+   }
+}
+
+
+int main(int argc, char **argv)
+{
+   int ret = run(argc, argv, init, reshape,
+                 draw, 0);
+
+   free(data);
+   return ret;
+}
-- 
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