X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=test%2Fimage_test.cc;h=ee4819d6b13998135faf7fd2322874077bd147c6;hb=3b48d5494c3cae7743d283203f5c8021860ab81f;hp=f876c8f65fc08c1e9d12b5758c982a7abe93f18e;hpb=e6f28e7cda23c1ba3c49cc1bf2dc1491c2f87160;p=dcpomatic.git

diff --git a/test/image_test.cc b/test/image_test.cc
index f876c8f65..ee4819d6b 100644
--- a/test/image_test.cc
+++ b/test/image_test.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
 
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -17,12 +17,19 @@
 
 */
 
+/** @file  test/image_test.cc
+ *  @brief Tests of the Image class.
+ *
+ *  @see test/make_black_test.cc, test/pixel_formats_test.cc
+ */
+
 #include <boost/test/unit_test.hpp>
 #include <Magick++.h>
 #include "lib/image.h"
 #include "lib/scaler.h"
 
 using std::string;
+using std::list;
 using std::cout;
 using boost::shared_ptr;
 
@@ -271,3 +278,125 @@ BOOST_AUTO_TEST_CASE (crop_scale_window_test)
 	crop_scale_window_single (AV_PIX_FMT_RGB24, dcp::Size (1000, 800), Crop (0, 0, 0, 0), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
 	crop_scale_window_single (AV_PIX_FMT_RGB24, dcp::Size (1000, 800), Crop (55, 0, 1, 9), dcp::Size (1920, 1080), dcp::Size (1998, 1080));
 }
+
+/** Test Image::alpha_blend */
+BOOST_AUTO_TEST_CASE (alpha_blend_test)
+{
+	int const stride = 48 * 4;
+	
+	shared_ptr<Image> A (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 48), false));
+	A->make_black ();
+	uint8_t* a = A->data()[0];
+
+	for (int y = 0; y < 48; ++y) {
+		uint8_t* p = a + y * stride;
+		for (int x = 0; x < 16; ++x) {
+			p[x * 4] = 255;
+			p[(x + 16) * 4 + 1] = 255;
+			p[(x + 32) * 4 + 2] = 255;
+		}
+	}
+
+	shared_ptr<Image> B (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 48), true));
+	B->make_transparent ();
+	uint8_t* b = B->data()[0];
+
+	for (int y = 32; y < 48; ++y) {
+		uint8_t* p = b + y * stride;
+		for (int x = 0; x < 48; ++x) {
+			p[x * 4] = 255;
+			p[x * 4 + 1] = 255;
+			p[x * 4 + 2] = 255;
+			p[x * 4 + 3] = 255;
+		}
+	}
+
+	A->alpha_blend (B, Position<int> (0, 0));
+
+	for (int y = 0; y < 32; ++y) {
+		uint8_t* p = a + y * stride;
+		for (int x = 0; x < 16; ++x) {
+			BOOST_CHECK_EQUAL (p[x * 4], 255);
+			BOOST_CHECK_EQUAL (p[(x + 16) * 4 + 1], 255);
+			BOOST_CHECK_EQUAL (p[(x + 32) * 4 + 2], 255);
+		}
+	}
+
+	for (int y = 32; y < 48; ++y) {
+		uint8_t* p = a + y * stride;
+		for (int x = 0; x < 48; ++x) {
+			BOOST_CHECK_EQUAL (p[x * 4], 255);
+			BOOST_CHECK_EQUAL (p[x * 4 + 1], 255);
+			BOOST_CHECK_EQUAL (p[x * 4 + 2], 255);
+			BOOST_CHECK_EQUAL (p[x * 4 + 3], 255);
+		}
+	}
+}
+
+/** Test merge (list<PositionImage>) with a single image */
+BOOST_AUTO_TEST_CASE (merge_test1)
+{
+	int const stride = 48 * 4;
+	
+	shared_ptr<Image> A (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 48), false));
+	A->make_transparent ();
+	uint8_t* a = A->data()[0];
+
+	for (int y = 0; y < 48; ++y) {
+		uint8_t* p = a + y * stride;
+		for (int x = 0; x < 16; ++x) {
+			/* red */
+			p[x * 4] = 255;
+			/* opaque */
+			p[x * 4 + 3] = 255;
+		}
+	}
+
+	list<PositionImage> all;
+	all.push_back (PositionImage (A, Position<int> (0, 0)));
+	PositionImage merged = merge (all);
+
+	BOOST_CHECK (merged.position == Position<int> (0, 0));
+	BOOST_CHECK_EQUAL (memcmp (merged.image->data()[0], A->data()[0], stride * 48), 0);
+}
+
+/** Test merge (list<PositionImage>) with two images */
+BOOST_AUTO_TEST_CASE (merge_test2)
+{
+	shared_ptr<Image> A (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 1), false));
+	A->make_transparent ();
+	uint8_t* a = A->data()[0];
+	for (int x = 0; x < 16; ++x) {
+		/* red */
+		a[x * 4] = 255;
+		/* opaque */
+		a[x * 4 + 3] = 255;
+	}
+
+	shared_ptr<Image> B (new Image (AV_PIX_FMT_RGBA, dcp::Size (48, 1), false));
+	B->make_transparent ();
+	uint8_t* b = B->data()[0];
+	for (int x = 0; x < 16; ++x) {
+		/* blue */
+		b[(x + 32) * 4 + 2] = 255;
+		/* opaque */
+		b[(x + 32) * 4 + 3] = 255;
+	}
+
+	list<PositionImage> all;
+	all.push_back (PositionImage (A, Position<int> (0, 0)));
+	all.push_back (PositionImage (B, Position<int> (0, 0)));
+	PositionImage merged = merge (all);
+
+	BOOST_CHECK (merged.position == Position<int> (0, 0));
+
+	uint8_t* m = merged.image->data()[0];
+
+	for (int x = 0; x < 16; ++x) {
+		BOOST_CHECK_EQUAL (m[x * 4], 255);
+		BOOST_CHECK_EQUAL (m[x * 4 + 3], 255);
+		BOOST_CHECK_EQUAL (m[(x + 16) * 4 + 3], 0);
+		BOOST_CHECK_EQUAL (m[(x + 32) * 4 + 2], 255);
+		BOOST_CHECK_EQUAL (m[(x + 32) * 4 + 3], 255);
+	}
+}