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, imgGirlAlphaWidth, imgGirlAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgL, (const void *)&imgGirlAlphaData[imgGirlAlphaWidth * (imgGirlAlphaHeight - 1)], -imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
imgS = vgCreateImage(VG_sRGBA_8888, imgGirlAlphaWidth, imgGirlAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgS, (const void *)&imgGirlAlphaData[imgGirlAlphaWidth * (imgGirlAlphaHeight - 1)], -imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
imgLpre = vgCreateImage(VG_lRGBA_8888_PRE, imgGirlAlphaWidth, imgGirlAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgLpre, (const void *)&imgGirlAlphaData[imgGirlAlphaWidth * (imgGirlAlphaHeight - 1)], -imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);
imgSpre = vgCreateImage(VG_sRGBA_8888_PRE, imgGirlAlphaWidth, imgGirlAlphaHeight, VG_IMAGE_QUALITY_NONANTIALIASED);
vgImageSubData(imgSpre, (const void *)&imgGirlAlphaData[imgGirlAlphaWidth * (imgGirlAlphaHeight - 1)], -imgGirlAlphaDataStride, imgGirlAlphaFormat, 0, 0, imgGirlAlphaWidth, imgGirlAlphaHeight);

// set alpha mask
vgMask(imgSrc, VG_SET_MASK, 0, 0, 256, 256);
vgSeti(VG_IMAGE_MODE, VG_DRAW_IMAGE_NORMAL);

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_normal_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_identity.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
	strcat(testDesc, " blend mode (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_normal_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_mask_identity.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
	strcat(testDesc, " blend mode (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

// 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) {

	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);
	vgLoadMatrix(matrix);

	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_normal_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_perpsective.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
#if defined(OPENVG_VERSION_1_1)
	strcat(testDesc, " blend mode (without alpha mask, perspective transformation and color transform)");
#else
	strcat(testDesc, " blend mode (without alpha mask, perspective 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);
	vgLoadMatrix(matrix);

	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_normal_");
	strcat(imgFileName, blendModeToString((VGBlendMode)i));
	strcat(imgFileName, "_mask_perspective.png");
	strcpy(testDesc, "Test vgDrawImage NORMAL with ");
	strcat(testDesc, blendModeToString((VGBlendMode)i));
#if defined(OPENVG_VERSION_1_1)
	strcat(testDesc, " blend mode (with alpha mask, perspective transformation and color transform)");
#else
	strcat(testDesc, " blend mode (with alpha mask, perspective 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);