1 files changed, 139 insertions, 0 deletions
diff --git a/progs/openvg/trivial/arc.c b/progs/openvg/trivial/arc.c
new file mode 100644
index 0000000000..db686bea6b
--- /dev/null
+++ b/progs/openvg/trivial/arc.c
@@ -0,0 +1,139 @@
+#include "eglcommon.h"
+
+#include <VG/openvg.h>
+#include <math.h>
+
+const VGfloat clear_color[4] = {1.0, 1.0, 1.0, 1.0};
+const VGfloat color[4] = {1.0, 1.0, 1.0, 0.5};
+
+VGPath vgPath;
+
+static void ellipse(VGPath vgPath, VGfloat rx, VGfloat ry, VGfloat angle)
+{
+    static const VGubyte cmd[] =
+    { VG_MOVE_TO_ABS, VG_SCCWARC_TO_REL, VG_SCCWARC_TO_REL, VG_CLOSE_PATH };
+
+    VGfloat val[12];
+    VGfloat c = cos(angle) * rx;
+    VGfloat s = sin(angle) * rx;
+
+    val[0] = c;
+    val[1] = s;
+    val[2] = rx;
+    val[3] = ry;
+    val[4] = angle;
+    val[5] = -2.0f * c;
+    val[6] = -2.0f * s;
+    val[7] = rx;
+    val[8] = ry;
+    val[9] = angle;
+    val[10] = 2.0f * c;
+    val[11] = 2.0f * s;
+
+    vgClearPath(vgPath, VG_PATH_CAPABILITY_ALL);
+    vgAppendPathData(vgPath, sizeof(cmd), cmd, val);
+    vgDrawPath(vgPath, VG_FILL_PATH | VG_STROKE_PATH);
+}
+
+static void
+init(void)
+{
+    VGPaint vgPaint;
+
+    vgSetfv(VG_CLEAR_COLOR, 4, clear_color);
+    vgPath = vgCreatePath(VG_PATH_FORMAT_STANDARD,
+                          VG_PATH_DATATYPE_F, 1.0f, 0.0f, 0, 0,
+                          VG_PATH_CAPABILITY_ALL);
+
+    vgPaint = vgCreatePaint();
+    vgSetParameteri(vgPaint, VG_PAINT_TYPE, VG_PAINT_TYPE_COLOR);
+    vgSetColor(vgPaint, 0x00ff00ff);
+    vgSetPaint(vgPaint, VG_FILL_PATH);
+
+    vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_NONANTIALIASED);
+    vgSeti(VG_BLEND_MODE, VG_BLEND_SRC_OVER);
+    vgSetf(VG_STROKE_LINE_WIDTH, 2.0f);
+    vgSeti(VG_STROKE_CAP_STYLE, VG_CAP_SQUARE);
+    vgSeti(VG_STROKE_JOIN_STYLE, VG_JOIN_MITER);
+    vgSetf(VG_STROKE_MITER_LIMIT, 4.0f);
+    vgSeti(VG_MATRIX_MODE, VG_MATRIX_PATH_USER_TO_SURFACE);
+}
+
+/* new window size or exposure */
+static void
+reshape(int w, int h)
+{
+}
+
+static void
+draw(void)
+{
+    vgClear(0, 0, window_width(), window_height());
+
+#if 0
+    vgLoadIdentity();
+    vgTranslate(40.0f, 24.0f);
+    vgScale(0.61804f, 0.61804f);
+    vgShear(-1.0f, 0.0f);
+    vgDrawPath(vgPath, VG_FILL_PATH | VG_STROKE_PATH);
+#else
+
+    /* row 1, col 1: Identity transform. */
+
+    vgLoadIdentity();
+    vgTranslate(8.0f, 8.0f);
+    ellipse(vgPath, 4.0f, 4.0f, 0.0f);
+
+    /* row 1, col 2: 10^3 horizontal squeeze. */
+
+    vgLoadIdentity();
+    vgTranslate(24.0f, 8.0f);
+    vgScale(1.0e-3f, 1.0f);
+    ellipse(vgPath, 4.0e3f, 4.0f, 0.0f);
+
+    /* row 1, col 3: 10^6 horizontal squeeze. */
+
+    vgLoadIdentity();
+    vgTranslate(40.0f, 8.0f);
+    vgScale(1.0e-6f, 1.0f);
+    ellipse(vgPath, 4.0e6f, 4.0f, 0.0f);
+
+    /* row 1, col 4: 10^9 horizontal squeeze. */
+
+    vgLoadIdentity();
+    vgTranslate(56.0f, 8.0f);
+    vgScale(1.0e-9f, 1.0f);
+    ellipse(vgPath, 4.0e9f, 4.0f, 0.0f);
+
+    /* row 2, col 1: 10^3 vertical squeeze. */
+
+    vgLoadIdentity();
+    vgTranslate(8.0f, 24.0f);
+    vgScale(1.0f, 1.0e-3f);
+    ellipse(vgPath, 4.0f, 4.0e3f, 0.0f);
+
+    /* row 2, col 2: Shear 0. */
+
+    vgLoadIdentity();
+    vgTranslate(24.0f, 24.0f);
+    vgShear(0.0f, 0.0f);
+    ellipse(vgPath, 4.0f, 4.0f, 0.0f);
+
+    /* row 2, col 3: Horizontal shear -1. */
+
+    vgLoadIdentity();
+    vgTranslate(40.0f, 24.0f);
+    vgScale(0.61804f, 0.61804f);
+    vgShear(-1.0f, 0.0f);
+    ellipse(vgPath, 10.47213f, 4.0f, 31.717f);
+#endif
+    vgFlush();
+}
+
+
+int main(int argc, char **argv)
+{
+    set_window_size(64, 64);
+   return run(argc, argv, init, reshape,
+              draw, 0);
+}