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(VG_lRGBA_8888, imgGirlAlphaWidth, imgGirlAlphaHeight, VG_IMAGE_QUALITY_FASTER);
vgImageSubData(img, (const void *)&imgGirlAlphaData[imgGirlAlphaWidth * (imgGirlAlphaHeight - 1)], -imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);

// 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);
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_NORMAL);

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_normal_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_affine.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode (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_normal_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_mask_affine.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode (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_normal_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_perpsective.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode (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_normal_");
	strcat(imgFileName, blendModeToString(i));
	strcat(imgFileName, "_mask_perspective.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString(i));
	strcat(testDesc, " blend mode (with alpha mask, perspective transformation)");
	
	saveDrawingSurface(f, imgFileName, testDesc, 0, 0, 256, 256);
	eglSwapBuffers(display, surface);
}

vgDestroyImage(imgSrc);
vgDestroyImage(img);