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 image and load external data
img = vgCreateImage(imgStencilAlphaFormat, imgStencilAlphaWidth, imgStencilAlphaHeight, VG_IMAGE_QUALITY_FASTER);
vgImageSubData(img, (const void *)&imgStencilAlphaData[imgStencilAlphaWidth * (imgStencilAlphaHeight - 1)], -imgStencilAlphaDataStride, imgStencilAlphaFormat, 0, 0, imgStencilAlphaWidth, imgStencilAlphaHeight);

// create image used for pattern, and load external data
imgPattern = vgCreateImage(VG_sRGBA_8888, imgPatternWidth, imgPatternHeight, VG_IMAGE_QUALITY_BETTER);
vgImageSubData(imgPattern, (const void *)&imgPatternData[imgPatternWidth * (imgPatternHeight - 1)], -imgPatternDataStride, imgPatternFormat, 0, 0, imgPatternWidth, imgPatternHeight);

// set a scissor rectangle
scissorRects[0] = 10.0f;  scissorRects[1] = 10.0f;  scissorRects[2] = 236.0f;  scissorRects[3] = 236.0f;
vgSetfv(VG_SCISSOR_RECTS, 4, scissorRects);
vgSeti(VG_SCISSORING, VG_TRUE);

// set alpha mask
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgSeti(VG_MASKING, VG_FALSE);
col[0] = 0.0f; col[1] = 0.0f; col[2] = 0.0f; col[3] = 0.9f;
vgSetfv(VG_CLEAR_COLOR, 4, col);
vgSeti(VG_IMAGE_MODE, VG_DRAW_IMAGE_STENCIL);

// create and set a paint for fill
fillPaint = vgCreatePaint();
vgSetParameteri(fillPaint, VG_PAINT_TYPE, VG_PAINT_TYPE_PATTERN);
vgPaintPattern(fillPaint, imgPattern);
vgSetParameteri(fillPaint, VG_PAINT_PATTERN_TILING_MODE, VG_TILE_REPEAT);
vgSetPaint(fillPaint, VG_FILL_PATH);

vgSeti(VG_MATRIX_MODE, VG_MATRIX_FILL_PAINT_TO_USER);
vgLoadIdentity();
vgScale(0.5f, 0.5f);

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

	vgClear(0, 0, 256, 256);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadIdentity();
	vgTranslate(32.0f, 32.0f);
	vgScale(0.75f, 0.75f);
	vgDrawImage(img);

	strcpy(imgFileName, "draw_image_stencil_pattern_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_affine.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode and pattern paint (without alpha mask, affine transformation)");
	
	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) {

	vgClear(0, 0, 256, 256);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadIdentity();
	vgTranslate(32.0f, 32.0f);
	vgScale(0.75f, 0.75f);
	vgDrawImage(img);

	strcpy(imgFileName, "draw_image_stencil_pattern_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_mask_affine.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode and pattern paint (with alpha mask, affine transformation)");
	
	saveDrawingSurface(f, imgFileName, testDesc, 0, 0, 256, 256);
	eglSwapBuffers(display, surface);
}

/*
// generate a perpsective matrix
matrix[0] = 1.2f;     matrix[3] = 0.2f;     matrix[6] = 10.0f;
matrix[1] = -0.2f;    matrix[4] = 1.2f;     matrix[7] = 70.0f;
matrix[2] = 0.002f;   matrix[5] = 0.003f;   matrix[8] = 0.8f;

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

	vgClear(0, 0, 256, 256);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadMatrix(matrix);
	vgDrawImage(img);

	strcpy(imgFileName, "draw_image_stencil_pattern_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_perpsective.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode and pattern paint (without alpha mask, perspective transformation)");
	
	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) {

	vgClear(0, 0, 256, 256);
	vgSeti(VG_BLEND_MODE, i);
	vgSeti(VG_MATRIX_MODE, VG_MATRIX_IMAGE_USER_TO_SURFACE);
	vgLoadMatrix(matrix);
	vgDrawImage(img);

	strcpy(imgFileName, "draw_image_stencil_pattern_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_mask_perspective.png");
	strcpy(testDesc, "Test vgDrawImage STENCIL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode and pattern paint (with alpha mask, perspective transformation)");
	
	saveDrawingSurface(f, imgFileName, testDesc, 0, 0, 256, 256);
	eglSwapBuffers(display, surface);
}
*/
vgDestroyImage(imgSrc);
vgDestroyImage(img);
vgDestroyImage(imgPattern);
vgDestroyPaint(fillPaint);