progs/openvg/trivial/mask.c

   1 #include "eglcommon.h"
   2
   3 #include <VG/openvg.h>
   4
   5 const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
   6 const VGfloat color[4] = {0.4, 0.1, 1.0, 1.0};
   7
   8 VGPath path;
   9 VGPaint fill;
  10
  11
  12 static void
  13 init(void)
  14 {
  15    static const VGubyte sqrCmds[5] = {VG_MOVE_TO_ABS, VG_HLINE_TO_ABS, VG_VLINE_TO_ABS, VG_HLINE_TO_ABS, VG_CLOSE_PATH};
  16    static const VGfloat sqrCoords[5]   = {50.0f, 50.0f, 250.0f, 250.0f, 50.0f};
  17    path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1, 0, 0, 0,
  18                        VG_PATH_CAPABILITY_APPEND_TO);
  19    vgAppendPathData(path, 5, sqrCmds, sqrCoords);
  20
  21    fill = vgCreatePaint();
  22    vgSetParameterfv(fill, VG_PAINT_COLOR, 4, color);
  23    vgSetPaint(fill, VG_FILL_PATH);
  24
  25    vgSetfv(VG_CLEAR_COLOR, 4, white_color);
  26    vgSetf(VG_STROKE_LINE_WIDTH, 10);
  27    vgSeti(VG_STROKE_CAP_STYLE, VG_CAP_BUTT);
  28    vgSeti(VG_STROKE_JOIN_STYLE, VG_JOIN_ROUND);
  29    vgSetf(VG_STROKE_MITER_LIMIT, 4.0f);
  30
  31    vgSeti(VG_MASKING, VG_TRUE);
  32
  33    vgMask(VG_INVALID_HANDLE, VG_CLEAR_MASK,
  34           25, 25, 100, 100);
  35 }
  36
  37 /* new window size or exposure */
  38 static void
  39 reshape(int w, int h)
  40 {
  41    vgLoadIdentity();
  42 }
  43
  44 static void
  45 draw(void)
  46 {
  47    vgClear(0, 0, window_width(), window_height());
  48    vgDrawPath(path, VG_FILL_PATH);
  49
  50    vgFlush();
  51 }
  52
  53
  54 int main(int argc, char **argv)
  55 {
  56    return run(argc, argv, init, reshape,
  57               draw, 0);
  58 }