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workaround to create images with transparent background

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This commit is contained in:
wmayer
2018-01-12 14:36:25 +01:00
parent 79dff6b8cc
commit 497b41d6d8
3 changed files with 69 additions and 12 deletions
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31
src/Gui/View3DInventorViewer.cpp
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@@ -1420,8 +1420,11 @@ void View3DInventorViewer::imageFromFramebuffer(int width, int height, int sampl
QtGLFramebufferObjectFormat fboFormat;
fboFormat.setSamples(samples);
fboFormat.setAttachment(QtGLFramebufferObject::Depth);
//With enabled alpha a transparent background is supported but
//at the same time breaks semi-transparent models
// With enabled alpha a transparent background is supported but
// at the same time breaks semi-transparent models. A workaround
// is to use a certain background color using GL_RGB as texture
// format and in the output image search for the above color and
// replaces it with the color requested by the user.
#if defined(HAVE_QT5_OPENGL)
//fboFormat.setInternalTextureFormat(GL_RGBA32F_ARB);
fboFormat.setInternalTextureFormat(GL_RGB32F_ARB);
@@ -1434,8 +1437,14 @@ void View3DInventorViewer::imageFromFramebuffer(int width, int height, int sampl
const QColor col = backgroundColor();
bool on = hasGradientBackground();
if (bgcolor.isValid()) {
setBackgroundColor(bgcolor);
int alpha = 255;
QColor bgopaque = bgcolor;
if (bgopaque.isValid()) {
// force an opaque background color
alpha = bgopaque.alpha();
if (alpha < 255)
bgopaque.setRgb(255,255,255);
setBackgroundColor(bgopaque);
setGradientBackground(false);
}
@@ -1443,6 +1452,20 @@ void View3DInventorViewer::imageFromFramebuffer(int width, int height, int sampl
setBackgroundColor(col);
setGradientBackground(on);
img = fbo.toImage();
// if background color isn't opaque manipulate the image
if (alpha < 255) {
QRgb rgba = bgcolor.rgba();
QRgb rgb = bgopaque.rgb();
QRgb * bits = (QRgb*) img.bits();
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (*bits == rgb)
*bits = rgba;
bits++;
}
}
}
}
void View3DInventorViewer::renderToFramebuffer(QtGLFramebufferObject* fbo)