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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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49
src/Gui/SoFCOffscreenRenderer.cpp
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@@ -478,6 +478,9 @@ void
SoQtOffscreenRenderer::setBackgroundColor(const SbColor4f & color)
{
PRIVATE(this)->backgroundcolor = color;
PRIVATE(this)->backgroundopaque = color;
if (color[3] < 1.0)
PRIVATE(this)->backgroundopaque.setValue(1,1,1,1);
}
/*!
@@ -556,8 +559,11 @@ SoQtOffscreenRenderer::makePixelBuffer(int width, int height, int samples)
viewport.setWindowSize(width, height);
QGLFormat fmt;
//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.
//fmt.setAlpha(true);
if (samples > 0) {
fmt.setSampleBuffers(true);
@@ -586,8 +592,11 @@ SoQtOffscreenRenderer::makeFrameBuffer(int width, int height, int samples)
QtGLFramebufferObjectFormat fmt;
fmt.setSamples(samples);
fmt.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)
//fmt.setInternalTextureFormat(GL_RGBA32F_ARB);
fmt.setInternalTextureFormat(GL_RGB32F_ARB);
@@ -654,10 +663,10 @@ SoQtOffscreenRenderer::renderFromBase(SoBase * base)
this->renderaction->setCacheContext(cache_context);
glEnable(GL_DEPTH_TEST);
glClearColor(this->backgroundcolor[0],
this->backgroundcolor[1],
this->backgroundcolor[2],
this->backgroundcolor[3]);
glClearColor(this->backgroundopaque[0],
this->backgroundopaque[1],
this->backgroundopaque[2],
this->backgroundopaque[3]);
// needed to clear viewport after glViewport() is called from
// SoGLRenderAction
@@ -764,6 +773,30 @@ SoQtOffscreenRenderer::writeToImage (QImage& img) const
#else
img = this->glImage;
#endif
if (PRIVATE(this)->backgroundcolor[3] < 1.0) {
QColor c1, c2;
c1.setRedF(PRIVATE(this)->backgroundcolor[0]);
c1.setGreenF(PRIVATE(this)->backgroundcolor[1]);
c1.setBlueF(PRIVATE(this)->backgroundcolor[2]);
c1.setAlphaF(PRIVATE(this)->backgroundcolor[3]);
c2.setRedF(PRIVATE(this)->backgroundopaque[0]);
c2.setGreenF(PRIVATE(this)->backgroundopaque[1]);
c2.setBlueF(PRIVATE(this)->backgroundopaque[2]);
c2.setAlphaF(PRIVATE(this)->backgroundopaque[3]);
QRgb rgba = c1.rgba();
QRgb rgb = c2.rgb();
QRgb * bits = (QRgb*) img.bits();
int height = img.height();
int width = img.width();
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (*bits == rgb)
*bits = rgba;
bits++;
}
}
}
}
/*!