progs/openvg/trivial/gradorigin.c

   1 #include "eglcommon.h"
   2
   3 #include <VG/openvg.h>
   4
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 static const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
   9
  10 static VGPath path;
  11 static VGPaint fill;
  12
  13 VGColorRampSpreadMode spread = VG_COLOR_RAMP_SPREAD_PAD;
  14
  15 static void
  16 init(void)
  17 {
  18    VGubyte commands[5] =  {VG_MOVE_TO_ABS, VG_LINE_TO_ABS, VG_LINE_TO_ABS, VG_LINE_TO_ABS, VG_CLOSE_PATH};
  19    VGfloat coords[8] =    {0.0f,0.0f, 32.0f,0.0f, 32.0f,32.0f, 0.0f,32.0f };
  20
  21    VGfloat rampStop[20] = {-0.5f,  1.0f, 1.0f, 1.0f, 1.0f,
  22                            0.25f, 1.0f, 0.0f, 0.0f, 1.0f,
  23                            0.75f, 0.0f, 0.0f, 1.0f, 1.0f,
  24                            1.5f,  0.0f, 0.0f, 0.0f, 0.0f};
  25
  26    VGfloat defaultColor[] = {1.0f, 1.0f, 1.0f, 1.0f};
  27    VGfloat linearGradient[4] = {0.0f, 0.0f, 0.0f, 32.0f};
  28
  29    path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F,
  30                        1.0f, 0.0f, 0, 0, VG_PATH_CAPABILITY_ALL);
  31    if (path == VG_INVALID_HANDLE)
  32       return;
  33
  34    fill = vgCreatePaint();
  35    if (fill == VG_INVALID_HANDLE) {
  36       vgDestroyPath(path);
  37       return;
  38    }
  39
  40    vgSetfv(VG_CLEAR_COLOR, 4, defaultColor);
  41    vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_NONANTIALIASED);
  42
  43    vgAppendPathData(path, 5, commands, coords);
  44
  45    vgSetPaint(fill, VG_FILL_PATH);
  46    vgSetParameteri(fill, VG_PAINT_TYPE, VG_PAINT_TYPE_LINEAR_GRADIENT);
  47    vgSetParameteri(fill, VG_PAINT_COLOR_RAMP_SPREAD_MODE,
  48                    VG_COLOR_RAMP_SPREAD_REPEAT);
  49    vgSetParameterfv(fill, VG_PAINT_LINEAR_GRADIENT, 4, linearGradient);
  50    vgSetParameterfv(fill, VG_PAINT_COLOR_RAMP_STOPS, 20, rampStop);
  51 }
  52
  53 /* new window size or exposure */
  54 static void
  55 reshape(int w, int h)
  56 {
  57    vgLoadIdentity();
  58 }
  59
  60 static void
  61 draw(void)
  62 {
  63    vgClear(0, 0, window_width(), window_height());
  64
  65    vgDrawPath(path, VG_FILL_PATH);
  66
  67    vgFlush();
  68 }
  69
  70
  71 int main(int argc, char **argv)
  72 {
  73    if (argc > 1) {
  74       const char *arg = argv[1];
  75       if (!strcmp("-pad", arg))
  76          spread = VG_COLOR_RAMP_SPREAD_PAD;
  77       else if (!strcmp("-repeat", arg))
  78          spread = VG_COLOR_RAMP_SPREAD_REPEAT;
  79       else if (!strcmp("-reflect", arg))
  80          spread = VG_COLOR_RAMP_SPREAD_REFLECT;
  81    }
  82
  83    switch(spread) {
  84    case VG_COLOR_RAMP_SPREAD_PAD:
  85       printf("Using spread mode: pad\n");
  86       break;
  87    case VG_COLOR_RAMP_SPREAD_REPEAT:
  88       printf("Using spread mode: repeat\n");
  89       break;
  90    case VG_COLOR_RAMP_SPREAD_REFLECT:
  91       printf("Using spread mode: reflect\n");
  92    }
  93
  94    set_window_size(200, 200);
  95
  96    return run(argc, argv, init, reshape,
  97               draw, 0);
  98 }