[Performous-commit] Tapio Vierros : Make OpenCV (and thus webcam support) optional ( in style of MIDI drum support).

[Tapio V. <aa...@us...>]

Module: performous
Branch: master
Commit: 3d4d8058f480f6813bcafbdb28ec115fa52425ba

Author: Tapio Vierros <tap...@gm...>
Date:   Sun May  9 21:48:42 2010 +0300

Make OpenCV (and thus webcam support) optional (in style of MIDI drum support).

---

 game/CMakeLists.txt |   16 ++++++++++++----
 game/screen_sing.cc |    2 ++
 game/webcam.cc      |   17 ++++++++++++++---
 game/webcam.hh      |    7 ++++++-
 4 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/game/CMakeLists.txt b/game/CMakeLists.txt
index ee87468..06c2b2a 100644
--- a/game/CMakeLists.txt
+++ b/game/CMakeLists.txt
@@ -79,16 +79,13 @@ else()
 endif()
 
 # Find all the libs that don't require extra parameters
-foreach(lib ${OUR_LIBS} SDL PangoCairo LibRSVG LibXML++ GLEW AVFormat SWScale OpenGL Z Jpeg Png OpenCV)
+foreach(lib ${OUR_LIBS} SDL PangoCairo LibRSVG LibXML++ GLEW AVFormat SWScale OpenGL Z Jpeg Png)
 	find_package(${lib} REQUIRED)
 	include_directories(${${lib}_INCLUDE_DIRS})
 	list(APPEND LIBS ${${lib}_LIBRARIES})
 	add_definitions(${${lib}_DEFINITIONS})
 endforeach(lib)
 
-	include_directories(${OpenCV_INCLUDE_DIR})
-	list(APPEND LIBS ${OpenCV_cv_LIBRARY} ${OpenCV_cvcore_LIBRARY} ${OpenCV_highgui_LIBRARY})
-
 find_package(Gettext)
 if(Gettext_FOUND)
 	include_directories(${Gettext_INCLUDE_DIRS})
@@ -109,6 +106,17 @@ else()
 	message(STATUS "MIDI I/O: Disabled (libportmidi not found)")
 endif()
 
+find_package(OpenCV)
+if(OpenCV_FOUND)
+	include_directories(${OpenCV_INCLUDE_DIRS})
+	list(APPEND LIBS ${OpenCV_LIBRARIES})
+	add_definitions("-DUSE_OPENCV")
+	message(STATUS "Webcam support: Enabled")
+else()
+	message(STATUS "Webcam support: Disabled (libcv not found)")
+endif()
+
+
 # Set default compile flags for GCC
 if(CMAKE_COMPILER_IS_GNUCXX)
 	message(STATUS "GCC detected, adding compile flags")
diff --git a/game/screen_sing.cc b/game/screen_sing.cc
index d7e18e2..fec2a0c 100644
--- a/game/screen_sing.cc
+++ b/game/screen_sing.cc
@@ -247,7 +247,9 @@ void ScreenSing::manageEvent(SDL_Event event) {
 		if (key == SDLK_v) m_audio.streamFade("vocals", event.key.keysym.mod & KMOD_SHIFT ? 1.0 : 0.0);
 		if (key == SDLK_k) dispInFlash(++config["game/karaoke_mode"]); // Toggle karaoke mode
 		if (key == SDLK_w) dispInFlash(++config["game/pitch"]); // Toggle pitch wave
+		#ifdef USE_OPENCV
 		if (key == SDLK_a) dispInFlash(++config["graphic/webcam"]); // Toggle webcam
+		#endif
 		// Latency settings
 		if (key == SDLK_F1) dispInFlash(--config["audio/video_delay"]);
 		if (key == SDLK_F2) dispInFlash(++config["audio/video_delay"]);
diff --git a/game/webcam.cc b/game/webcam.cc
index 5595309..aa35dd0 100644
--- a/game/webcam.cc
+++ b/game/webcam.cc
@@ -3,15 +3,23 @@
 #include "webcam.hh"
 
 Webcam::Webcam(int cam_id): m_capture(NULL), m_timestamp(0) {
+	#ifdef USE_OPENCV
 	m_capture = cvCaptureFromCAM(cam_id);
-	if (!m_capture) {
+	if (!m_capture)
 		std::cout << "Could not initialize webcam capturing!" << std::endl;
-		return;
-	}
+	#else
+	++cam_id; // dummy
+	#endif
 }
 
+Webcam::~Webcam() {
+	#ifdef USE_OPENCV
+	cvReleaseCapture(&m_capture);
+	#endif
+}
 
 void Webcam::render(double time) {
+	#ifdef USE_OPENCV
 	if (!m_capture) return;
 	IplImage* frame = 0;
 	if (time > m_timestamp + 0.5) {
@@ -21,4 +29,7 @@ void Webcam::render(double time) {
 		m_timestamp = time;
 	}
 	m_surface.draw();
+	#else
+	++time; // dummy
+	#endif
 }
diff --git a/game/webcam.hh b/game/webcam.hh
index e1b7ce4..b64bece 100644
--- a/game/webcam.hh
+++ b/game/webcam.hh
@@ -1,6 +1,11 @@
+#pragma once
 
+#ifdef USE_OPENCV
 #include <cv.h>
 #include <highgui.h>
+#else
+typedef void CvCapture;
+#endif
 
 #include "surface.hh"
 
@@ -9,7 +14,7 @@ class Webcam {
 	/// cam_id -1 means pick any device
 	Webcam(int cam_id = -1);
 
-	~Webcam() { cvReleaseCapture(&m_capture); }
+	~Webcam();
 
 	/// Is good?
 	bool operator()() { return m_capture != 0; }