Demos (master): egl/openvg: Add a demo for color transform.

[Chia-I Wu]

Module: Demos
Branch: master
Commit: f5874a5dc018dbe922b44219f0e06db47fd11a2e
URL:    http://cgit.freedesktop.org/mesa/demos/commit/?id=f5874a5dc018dbe922b44219f0e06db47fd11a2e

Author: Chia-I Wu <olvaffe at gmail.com>
Date:   Mon Nov 29 13:55:19 2010 +0800

egl/openvg: Add a demo for color transform.

---

 src/egl/openvg/trivial/Makefile.am       |    2 +
 src/egl/openvg/trivial/color_transform.c |  136 ++++++++++++++++++++++++++++++
 2 files changed, 138 insertions(+), 0 deletions(-)

diff --git a/src/egl/openvg/trivial/Makefile.am b/src/egl/openvg/trivial/Makefile.am
index 9e2b57e..34122ae 100644
--- a/src/egl/openvg/trivial/Makefile.am
+++ b/src/egl/openvg/trivial/Makefile.am
@@ -47,6 +47,7 @@ noinst_PROGRAMS = \
 	arc \
 	cap \
 	clear \
+	color_transform \
 	coord \
 	dash \
 	ellipse \
@@ -75,6 +76,7 @@ noinst_PROGRAMS = \
 arc_LDADD = libcommon.la
 cap_LDADD = libcommon.la
 clear_LDADD = libcommon.la
+color_transform_LDADD = libcommon.la
 coord_LDADD = libcommon.la
 dash_LDADD = libcommon.la
 ellipse_LDADD = libcommon.la
diff --git a/src/egl/openvg/trivial/color_transform.c b/src/egl/openvg/trivial/color_transform.c
new file mode 100644
index 0000000..086af15
--- /dev/null
+++ b/src/egl/openvg/trivial/color_transform.c
@@ -0,0 +1,136 @@
+#include "eglcommon.h"
+
+#include <VG/openvg.h>
+
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef OPENVG_VERSION_1_1
+
+static VGPath rect;
+
+static void
+init(void)
+{
+   VGPaint paint;
+
+   VGubyte cmd[] = {
+      VG_MOVE_TO_ABS,
+      VG_LINE_TO_ABS,
+      VG_LINE_TO_ABS,
+      VG_LINE_TO_ABS,
+      VG_CLOSE_PATH
+   };
+   VGfloat val[] = {
+      0.0f, 0.0f,
+      1.0f, 0.0f,
+      1.0f, 1.0f,
+      0.0f, 1.0f
+   };
+   const VGfloat white[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
+
+
+   rect = vgCreatePath(VG_PATH_FORMAT_STANDARD,
+                       VG_PATH_DATATYPE_F, 1.0f, 0.0f, 0, 0,
+                       VG_PATH_CAPABILITY_ALL);
+   vgAppendPathData(rect, sizeof(cmd), cmd, val);
+
+   paint = vgCreatePaint();
+   vgSetColor(paint, 0xffffffff);
+   vgSetPaint(paint, VG_FILL_PATH);
+
+   vgSetfv(VG_CLEAR_COLOR, 4, white);
+
+   vgSeti(VG_COLOR_TRANSFORM, VG_TRUE);
+   vgSeti(VG_MASKING, VG_TRUE);
+}
+
+/* new window size or exposure */
+static void
+reshape(int w, int h)
+{
+   /* test color transform and masking interaction */
+   vgMask(VG_INVALID_HANDLE, VG_FILL_MASK, 0, 0, w, h);
+   vgMask(VG_INVALID_HANDLE, VG_CLEAR_MASK, 0, 10, w, 2);
+   vgMask(VG_INVALID_HANDLE, VG_CLEAR_MASK, 10, 0, 2, h);
+}
+
+static void
+rectangle(VGint x, VGint y, VGint width, VGint height)
+{
+   vgLoadIdentity();
+   vgTranslate(x, y);
+   vgScale(width, height);
+   vgDrawPath(rect, VG_FILL_PATH);
+}
+
+static void
+draw(void)
+{
+   VGfloat xform[8], identity[8] = {
+      1.0f, 1.0f, 1.0f, 1.0f,
+      0.0f, 0.0f, 0.0f, 0.0f
+   };
+   VGint w = window_width();
+   VGint h = window_height();
+
+   vgClear(0, 0, w, h);
+
+   w /= 2;
+   h /= 2;
+
+   /* bottom left: red */
+   memcpy(xform, identity, sizeof(identity));
+   xform[0] = 0.5f;
+   xform[1] = 0.0f;
+   xform[2] = 0.0f;
+   xform[4] = 0.5f;
+   vgSetfv(VG_COLOR_TRANSFORM_VALUES, 8, xform);
+   rectangle(0, 0, w, h);
+
+   /* bottom right: green */
+   memcpy(xform, identity, sizeof(identity));
+   xform[0] = 0.0f;
+   xform[1] = 2.0f;
+   xform[2] = 0.0f;
+   xform[5] = -1.0f;
+   vgSetfv(VG_COLOR_TRANSFORM_VALUES, 8, xform);
+   rectangle(w, 0, w, h);
+
+   /* top left: blue */
+   memcpy(xform, identity, sizeof(identity));
+   xform[0] = 0.0f;
+   xform[1] = 0.0f;
+   xform[2] = 200.0f;
+   xform[6] = -200.0f;
+   vgSetfv(VG_COLOR_TRANSFORM_VALUES, 8, xform);
+   rectangle(0, h, w, h);
+
+   /* top right: black */
+   memcpy(xform, identity, sizeof(identity));
+   xform[0] = -1.0f;
+   xform[1] = -200.0f;
+   xform[2] = 0.0f;
+   xform[4] = 1.0f;
+   vgSetfv(VG_COLOR_TRANSFORM_VALUES, 8, xform);
+   rectangle(w, h, w, h);
+}
+
+int main(int argc, char **argv)
+{
+   set_window_size(300, 300);
+   return run(argc, argv, init, reshape,
+              draw, 0);
+}
+
+#else /* OPENVG_VERSION_1_1 */
+
+int main(int argc, char **argv)
+{
+   printf("This demo requires OpenVG 1.1\n");
+   return 0;
+}
+
+#endif /* OPENVG_VERSION_1_1 */