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Rather than copying to a QImage, just send the pointer. Also, put the render

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code in Webcam itself.
This commit is contained in:
Andrzej Kapolka 2013-06-18 12:13:40 -07:00
parent 341cde61f5
commit 9e92ea03da
3 changed files with 93 additions and 79 deletions
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23
interface/src/Application.cpp
View file

@ -2151,28 +2151,7 @@ void Application::displayOverlay() {
}
// render the webcam input frame
if (_webcam.getFrameTextureID() != 0) {
glBindTexture(GL_TEXTURE_2D, _webcam.getFrameTextureID());
glEnable(GL_TEXTURE_2D);
glColor3f(1.0f, 1.0f, 1.0f);
glBegin(GL_QUADS);
const int FRAME_PREVIEW_HEIGHT = 200;
int framePreviewWidth = _webcam.getFrameAspectRatio() * FRAME_PREVIEW_HEIGHT;
int bottom = _glWidget->height() - 400;
int left = _glWidget->width() - framePreviewWidth - 400;
glTexCoord2f(0, 0);
glVertex2f(left, bottom);
glTexCoord2f(1, 0);
glVertex2f(left + framePreviewWidth, bottom);
glTexCoord2f(1, 1);
glVertex2f(left + framePreviewWidth, bottom + FRAME_PREVIEW_HEIGHT);
glTexCoord2f(0, 1);
glVertex2f(left, bottom + FRAME_PREVIEW_HEIGHT);
glEnd();
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
}
_webcam.renderPreview(_glWidget->width(), _glWidget->height());
glPopMatrix();
}

124
interface/src/Webcam.cpp
View file

@ -14,20 +14,81 @@
#include "Application.h"
#include "Webcam.h"
class FrameGrabber : public QObject {
public:
FrameGrabber() : _capture(0) { }
virtual ~FrameGrabber();
Webcam::Webcam() : _frameTextureID(0) {
// the grabber simply runs as fast as possible
_grabber = new FrameGrabber();
_grabber->moveToThread(&_grabberThread);
}
protected:
void Webcam::init() {
// start the grabber thread
_grabberThread.start();
virtual void timerEvent(QTimerEvent* event);
// let the grabber know we're ready for the first frame
QMetaObject::invokeMethod(_grabber, "grabFrame");
}
void Webcam::renderPreview(int screenWidth, int screenHeight) {
if (_frameTextureID != 0) {
glBindTexture(GL_TEXTURE_2D, _frameTextureID);
glEnable(GL_TEXTURE_2D);
glColor3f(1.0f, 1.0f, 1.0f);
glBegin(GL_QUADS);
const int PREVIEW_HEIGHT = 200;
int previewWidth = _frameWidth * PREVIEW_HEIGHT / _frameHeight;
int bottom = screenHeight - 400;
int left = screenWidth - previewWidth - 400;
glTexCoord2f(0, 0);
glVertex2f(left, bottom);
glTexCoord2f(1, 0);
glVertex2f(left + previewWidth, bottom);
glTexCoord2f(1, 1);
glVertex2f(left + previewWidth, bottom + PREVIEW_HEIGHT);
glTexCoord2f(0, 1);
glVertex2f(left, bottom + PREVIEW_HEIGHT);
glEnd();
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
}
}
Webcam::~Webcam() {
// stop the grabber thread
_grabberThread.quit();
_grabberThread.wait();
private:
delete _grabber;
}
void Webcam::setFrame(void* image) {
IplImage* img = static_cast<IplImage*>(image);
GLint internalFormat;
GLenum format;
if (img->nChannels == 3) {
internalFormat = GL_RGB;
format = GL_BGR;
} else {
internalFormat = GL_RGBA;
format = GL_BGRA;
}
if (_frameTextureID == 0) {
glGenTextures(1, &_frameTextureID);
glBindTexture(GL_TEXTURE_2D, _frameTextureID);
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, _frameWidth = img->width, _frameHeight = img->height, 0, format,
GL_UNSIGNED_BYTE, img->imageData);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
CvCapture* _capture;
};
} else {
glBindTexture(GL_TEXTURE_2D, _frameTextureID);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, _frameWidth, _frameHeight, format, GL_UNSIGNED_BYTE, img->imageData);
}
glBindTexture(GL_TEXTURE_2D, 0);
// let the grabber know we're ready for the next frame
QMetaObject::invokeMethod(_grabber, "grabFrame");
}
FrameGrabber::~FrameGrabber() {
if (_capture != 0) {
@ -35,7 +96,7 @@ FrameGrabber::~FrameGrabber() {
}
}
void FrameGrabber::timerEvent(QTimerEvent* event) {
void FrameGrabber::grabFrame() {
if (_capture == 0) {
if ((_capture = cvCaptureFromCAM(-1)) == 0) {
printLog("Failed to open webcam.\n");
@ -52,44 +113,5 @@ void FrameGrabber::timerEvent(QTimerEvent* event) {
printLog("Invalid webcam image format.\n");
return;
}
QMetaObject::invokeMethod(Application::getInstance()->getWebcam(), "setFrame",
Q_ARG(QImage, QImage((uchar*)image->imageData, image->width, image->height, image->widthStep,
image->nChannels == 3 ? QImage::Format_RGB888 : QImage::Format_ARGB32).copy(0, 0, image->width, image->height)));
QMetaObject::invokeMethod(Application::getInstance()->getWebcam(), "setFrame", Q_ARG(void*, image));
}
Webcam::Webcam() : _frameTextureID(0) {
// the grabber simply runs as fast as possible
_grabber = new FrameGrabber();
_grabber->startTimer(0);
_grabber->moveToThread(&_grabberThread);
}
void Webcam::init() {
// start the grabber thread
_grabberThread.start();
}
Webcam::~Webcam() {
// stop the grabber thread
_grabberThread.quit();
_grabberThread.wait();
delete _grabber;
}
void Webcam::setFrame(const QImage& image) {
GLenum format = (image.format() == QImage::Format_RGB888) ? GL_BGR : GL_BGRA;
if (_frameTextureID == 0) {
glGenTextures(1, &_frameTextureID);
glBindTexture(GL_TEXTURE_2D, _frameTextureID);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, _frameWidth = image.width(), _frameHeight = image.height(), 0, format,
GL_UNSIGNED_BYTE, image.constBits());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
} else {
glBindTexture(GL_TEXTURE_2D, _frameTextureID);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, _frameWidth, _frameHeight, format, GL_UNSIGNED_BYTE, image.constBits());
}
glBindTexture(GL_TEXTURE_2D, 0);
}

25
interface/src/Webcam.h
View file

@ -29,15 +29,11 @@ public:
~Webcam();
void init();
int getFrameWidth() const { return _frameWidth; }
int getFrameHeight() const { return _frameHeight; }
float getFrameAspectRatio() const { return _frameWidth / (float)_frameHeight; }
GLuint getFrameTextureID() const { return _frameTextureID; }
void renderPreview(int screenWidth, int screenHeight);
public slots:
void setFrame(const QImage& image);
void setFrame(void* image);
private:
@ -49,4 +45,21 @@ private:
GLuint _frameTextureID;
};
class FrameGrabber : public QObject {
Q_OBJECT
public:
FrameGrabber() : _capture(0) { }
virtual ~FrameGrabber();
public slots:
void grabFrame();
private:
CvCapture* _capture;
};
#endif /* defined(__interface__Webcam__) */