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Diffstat (limited to 'progs/openvg/trivial/readpixels.c')
-rw-r--r--progs/openvg/trivial/readpixels.c75
1 files changed, 75 insertions, 0 deletions
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;
+}