Hi there.

I've tried to use the linear gradients with the reference implementation, but somehow I don't get them working.

The strange thing is: As soon as I comment out the vgSetParameterfv (paint, VG_PAINT_COLOR_RAMP_STOPS call I have valid results using the default ramp, but if I try to define my own I either get completely wrong output or nothing at all (depends on the spread mode).


Could someone please have a look? (code assumes no mask/scissoring or other things modified from the context creation defaults)


Code :
void gradient_test (void)
{
  VGfloat color[4] = 
  { 
    1,1,1,1 // opaque white
  };
 
  VGfloat stops[10] = 
  {
    0, 1, 0, 0, 0, // opaque red at start
    1, 1, 1, 1, 1, // opaque white at end
  };
 
 
  VGfloat gradient[4] =  
  { 
    100, 100, 200, 200, 
  };
 
  VGImage img = vgCreateImage (VG_sL_8, 256, 256, VG_IMAGE_QUALITY_NONANTIALIASED);
  vgSetfv (VG_CLEAR_COLOR, 4, color);
  vgClearImage (img, 0,0,256,256);
 
  VGPaint paint = vgCreatePaint();
  vgSetPaint        (paint, VG_FILL_PATH);
  vgSetParameteri   (paint, VG_PAINT_TYPE, VG_PAINT_TYPE_LINEAR_GRADIENT);
  vgSetParameteri   (paint, VG_PAINT_COLOR_RAMP_SPREAD_MODE, VG_COLOR_RAMP_SPREAD_REPEAT);
  vgSetParameterfv  (paint, VG_PAINT_COLOR_RAMP_STOPS, 10, stops);
  vgSetParameterfv  (paint, VG_PAINT_LINEAR_GRADIENT,  4, gradient);
 
  vgSeti (VG_BLEND_MODE,  VG_BLEND_SRC_OVER);
  vgSeti (VG_IMAGE_MODE,  VG_DRAW_IMAGE_MULTIPLY);
 
  vgSeti (VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
  vgLoadIdentity();
  vgTranslate    (10,10);
 
  vgDrawImage    (img);
  vgDestroyImage (img);
  vgDestroyPaint (paint);
}