vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_BETTER);
vgSeti(VG_IMAGE_QUALITY, VG_IMAGE_QUALITY_BETTER);
vgSeti(VG_SCISSORING, VG_FALSE);
col[0] = 0.0f; col[1] = 0.0f; col[2] = 0.0f; col[3] = 0.0f;
vgSetfv(VG_CLEAR_COLOR, 4, col);
vgClear(0, 0, 256, 256);

// create alphamask image and load external data
imgSrc = vgCreateImage(VG_lRGBA_8888, imgBarbaraAlphaWidth, imgBarbaraAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgSrc, (const void *)&imgBarbaraAlphaData[imgBarbaraAlphaWidth * (imgBarbaraAlphaHeight - 1)], -imgBarbaraAlphaDataStride, imgBarbaraAlphaFormat, 0, 0, imgBarbaraAlphaWidth, imgBarbaraAlphaHeight);

// create draw images and load external data
imgL = vgCreateImage(VG_lRGBA_8888, imgStencilAlphaWidth, imgStencilAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgL, (const void *)&imgStencilAlphaData[imgStencilAlphaWidth * (imgStencilAlphaHeight - 1)], -imgStencilAlphaDataStride, imgStencilAlphaFormat, 0, 0, imgStencilAlphaWidth, imgStencilAlphaHeight);
imgS = vgCreateImage(VG_sRGBA_8888, imgStencilAlphaWidth, imgStencilAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgS, (const void *)&imgStencilAlphaData[imgStencilAlphaWidth * (imgStencilAlphaHeight - 1)], -imgStencilAlphaDataStride, imgStencilAlphaFormat, 0, 0, imgStencilAlphaWidth, imgStencilAlphaHeight);
imgLpre = vgCreateImage(VG_lRGBA_8888_PRE, imgStencilAlphaWidth, imgStencilAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgLpre, (const void *)&imgStencilAlphaData[imgStencilAlphaWidth * (imgStencilAlphaHeight - 1)], -imgStencilAlphaDataStride, imgStencilAlphaFormat, 0, 0, imgStencilAlphaWidth, imgStencilAlphaHeight);
imgSpre = vgCreateImage(VG_sRGBA_8888_PRE, imgStencilAlphaWidth, imgStencilAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgSpre, (const void *)&imgStencilAlphaData[imgStencilAlphaWidth * (imgStencilAlphaHeight - 1)], -imgStencilAlphaDataStride, imgStencilAlphaFormat, 0, 0, imgStencilAlphaWidth, imgStencilAlphaHeight);

// set alpha mask
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgSeti(VG_MASKING, VG_FALSE);
vgSeti(VG_IMAGE_MODE, VG_DRAW_IMAGE_STENCIL);

// create and set a paint for fill
fillPaint = vgCreatePaint();

colStops[0]  = 0.00f; colStops[1]  = 0.4f; colStops[2]  = 0.0f; colStops[3]  = 0.6f; colStops[4]  = 0.80f;
colStops[5]  = 0.25f; colStops[6]  = 0.9f; colStops[7]  = 0.5f; colStops[8]  = 0.1f; colStops[9]  = 0.45f;
colStops[10] = 0.50f; colStops[11] = 0.8f; colStops[12] = 0.8f; colStops[13] = 0.0f; colStops[14] = 1.00f;
colStops[15] = 0.75f; colStops[16] = 0.0f; colStops[17] = 0.3f; colStops[18] = 0.5f; colStops[19] = 0.90f;
colStops[20] = 1.00f; colStops[21] = 0.4f; colStops[22] = 0.0f; colStops[23] = 0.6f; colStops[24] = 0.80f;

radGrad[0] = 0.0f; radGrad[1] = 0.0f;
radGrad[2] = -150.0f; radGrad[3] = 150.0f;
radGrad[4] = 256.0f;

vgSetParameteri(fillPaint, VG_PAINT_TYPE, VG_PAINT_TYPE_RADIAL_GRADIENT);
vgSetParameterfv(fillPaint, VG_PAINT_COLOR_RAMP_STOPS, 25, colStops);
vgSetParameterfv(fillPaint, VG_PAINT_RADIAL_GRADIENT, 5, radGrad);
vgSetPaint(fillPaint, VG_FILL_PATH);
vgSeti(VG_MATRIX_MODE, VG_MATRIX_FILL_PAINT_TO_USER);
vgLoadIdentity();
vgTranslate(128.0f, 128.0f);
vgScale(0.5f, 0.5f);
vgRotate(90.0f);
vgSetParameteri(fillPaint, VG_PAINT_COLOR_RAMP_SPREAD_MODE, VG_COLOR_RAMP_SPREAD_REPEAT);

vgSeti(VG_MASKING, VG_FALSE);
for (i = VG_BLEND_SRC; i <= VG_BLEND_ADDITIVE; ++i) {

	vgSeti(VG_SCISSORING, VG_FALSE);
	vgWritePixels(imgBackgroundData, imgBackgroundDataStride, imgBackgroundFormat, 0, 0, imgBackgroundWidth, imgBackgroundHeight);
	vgSeti(VG_SCISSORING, VG_TRUE);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadIdentity();

	scissorRects[0] = 10.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgL);
	scissorRects[0] = 10.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgS);
	scissorRects[0] = 128.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgLpre);
	scissorRects[0] = 128.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgSpre);

	strcpy(imgFileName, "draw_image_stencil_radgrad_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_identity.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
	strcat(testDesc, " blend mode and radial gradient paint (without alpha mask)");

	saveDrawingSurface(f, imgFileName, testDesc, 0, 0, 256, 256);
	eglSwapBuffers(display, surface);
}

vgSeti(VG_MASKING, VG_TRUE);
for (i = VG_BLEND_SRC; i <= VG_BLEND_ADDITIVE; ++i) {

	vgSeti(VG_SCISSORING, VG_FALSE);
	vgWritePixels(imgBackgroundData, imgBackgroundDataStride, imgBackgroundFormat, 0, 0, imgBackgroundWidth, imgBackgroundHeight);
	vgSeti(VG_SCISSORING, VG_TRUE);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadIdentity();

	scissorRects[0] = 10.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgL);
	scissorRects[0] = 10.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgS);
	scissorRects[0] = 128.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgLpre);
	scissorRects[0] = 128.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgSpre);

	strcpy(imgFileName, "draw_image_stencil_radgrad_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_mask_identity.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
	strcat(testDesc, " blend mode and radial gradient paint (with alpha mask)");

	saveDrawingSurface(f, imgFileName, testDesc, 0, 0, 256, 256);
	eglSwapBuffers(display, surface);
}

#if defined(OPENVG_VERSION_1_1)
// set a color transformation
{
	VGfloat ctValues[8] = { -1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f };
	vgSetfv(VG_COLOR_TRANSFORM_VALUES, 8, ctValues);
}
vgSeti(VG_COLOR_TRANSFORM, VG_TRUE);
#endif

vgSeti(VG_MASKING, VG_FALSE);
for (i = VG_BLEND_SRC; i <= VG_BLEND_ADDITIVE; ++i) {

	vgSeti(VG_SCISSORING, VG_FALSE);
	vgWritePixels(imgBackgroundData, imgBackgroundDataStride, imgBackgroundFormat, 0, 0, imgBackgroundWidth, imgBackgroundHeight);
	vgSeti(VG_SCISSORING, VG_TRUE);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadIdentity();
	vgTranslate(128.0f, 128.0f);
	vgRotate(90.0f);
	vgTranslate(-128.0f, -128.0f);

	scissorRects[0] = 10.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgL);
	scissorRects[0] = 10.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgS);
	scissorRects[0] = 128.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgLpre);
	scissorRects[0] = 128.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgSpre);

	strcpy(imgFileName, "draw_image_stencil_radgrad_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_affine.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
#if defined(OPENVG_VERSION_1_1)
	strcat(testDesc, " blend mode and radial gradient paint (without alpha mask, affine transformation and color transform)");
#else
	strcat(testDesc, " blend mode and radial gradient paint (without alpha mask, affine transformation)");
#endif

	saveDrawingSurface(f, imgFileName, testDesc, 0, 0, 256, 256);
	eglSwapBuffers(display, surface);
}

vgSeti(VG_MASKING, VG_TRUE);
for (i = VG_BLEND_SRC; i <= VG_BLEND_ADDITIVE; ++i) {

	vgSeti(VG_SCISSORING, VG_FALSE);
	vgWritePixels(imgBackgroundData, imgBackgroundDataStride, imgBackgroundFormat, 0, 0, imgBackgroundWidth, imgBackgroundHeight);
	vgSeti(VG_SCISSORING, VG_TRUE);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadIdentity();
	vgTranslate(128.0f, 128.0f);
	vgRotate(90.0f);
	vgTranslate(-128.0f, -128.0f);

	scissorRects[0] = 10.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgL);
	scissorRects[0] = 10.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgS);
	scissorRects[0] = 128.0f;  scissorRects[1] = 128.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgLpre);
	scissorRects[0] = 128.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 118.0f;  scissorRects[3] = 118.0f;
	vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
	vgDrawImage(imgSpre);

	strcpy(imgFileName, "draw_image_stencil_radgrad_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_mask_affine.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
#if defined(OPENVG_VERSION_1_1)
	strcat(testDesc, " blend mode and radial gradient paint (with alpha mask, affine transformation and color transform)");
#else
	strcat(testDesc, " blend mode and radial gradient paint (with alpha mask, affine transformation)");
#endif

	saveDrawingSurface(f, imgFileName, testDesc, 0, 0, 256, 256);
	eglSwapBuffers(display, surface);
}
#if defined(OPENVG_VERSION_1_1)
vgSeti(VG_COLOR_TRANSFORM, VG_FALSE);
#endif

vgDestroyImage(imgSrc);
vgDestroyImage(imgL);
vgDestroyImage(imgS);
vgDestroyImage(imgLpre);
vgDestroyImage(imgSpre);
vgDestroyPaint(fillPaint);