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author | Rhys Weatherley <rhys.weatherley@nokia.com> | 2009-10-16 02:22:10 (GMT) |
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committer | Rhys Weatherley <rhys.weatherley@nokia.com> | 2009-10-16 02:22:10 (GMT) |
commit | 46616a79db9ab11ce726243f12615a478a4c368a (patch) | |
tree | da34c4779052039ccc478d670170ff83196817c2 /src/openvg/qpixmapfilter_vg.cpp | |
parent | d9ed45eaaf0e8bacfa0f4569f226655057b614eb (diff) | |
download | Qt-46616a79db9ab11ce726243f12615a478a4c368a.zip Qt-46616a79db9ab11ce726243f12615a478a4c368a.tar.gz Qt-46616a79db9ab11ce726243f12615a478a4c368a.tar.bz2 |
Implement the strength parameter for OpenVG colorize filters
Task-number: QT-2016
Reviewed-by: trustme
Diffstat (limited to 'src/openvg/qpixmapfilter_vg.cpp')
-rw-r--r-- | src/openvg/qpixmapfilter_vg.cpp | 86 |
1 files changed, 40 insertions, 46 deletions
diff --git a/src/openvg/qpixmapfilter_vg.cpp b/src/openvg/qpixmapfilter_vg.cpp index 613f4ea..3305bbb 100644 --- a/src/openvg/qpixmapfilter_vg.cpp +++ b/src/openvg/qpixmapfilter_vg.cpp @@ -123,8 +123,7 @@ void QVGPixmapConvolutionFilter::draw } QVGPixmapColorizeFilter::QVGPixmapColorizeFilter() - : QPixmapColorizeFilter(), - firstTime(true) + : QPixmapColorizeFilter() { } @@ -136,7 +135,7 @@ void QVGPixmapColorizeFilter::draw(QPainter *painter, const QPointF &dest, const { if (src.pixmapData()->classId() != QPixmapData::OpenVGClass) { // The pixmap data is not an instance of QVGPixmapData, so fall - // back to the default convolution filter implementation. + // back to the default colorize filter implementation. QPixmapColorizeFilter::draw(painter, dest, src, srcRect); return; } @@ -154,50 +153,45 @@ void QVGPixmapColorizeFilter::draw(QPainter *painter, const QPointF &dest, const if (dstImage == VG_INVALID_HANDLE) return; - // Recompute the color matrix if the color has changed. + // Determine the weights for the matrix from the color and strength. QColor c = color(); - if (c != prevColor || firstTime) { - prevColor = c; - - // Determine the weights for the matrix from the color. - VGfloat weights[3]; - VGfloat invweights[3]; - VGfloat alpha = c.alphaF(); - weights[0] = c.redF() * alpha; - weights[1] = c.greenF() * alpha; - weights[2] = c.blueF() * alpha; - invweights[0] = 1.0f - weights[0]; - invweights[1] = 1.0f - weights[1]; - invweights[2] = 1.0f - weights[2]; - - // Grayscale weights. - static const VGfloat redGray = 11.0f / 32.0f; - static const VGfloat greenGray = 16.0f / 32.0f; - static const VGfloat blueGray = 1.0f - (redGray + greenGray); - - matrix[0][0] = redGray * invweights[0]; - matrix[0][1] = redGray * invweights[1]; - matrix[0][2] = redGray * invweights[2]; - matrix[0][3] = 0.0f; - matrix[1][0] = greenGray * invweights[0]; - matrix[1][1] = greenGray * invweights[1]; - matrix[1][2] = greenGray * invweights[2]; - matrix[1][3] = 0.0f; - matrix[2][0] = blueGray * invweights[0]; - matrix[2][1] = blueGray * invweights[1]; - matrix[2][2] = blueGray * invweights[2]; - matrix[2][3] = 0.0f; - matrix[3][0] = 0.0f; - matrix[3][1] = 0.0f; - matrix[3][2] = 0.0f; - matrix[3][3] = 1.0f; - matrix[4][0] = weights[0]; - matrix[4][1] = weights[1]; - matrix[4][2] = weights[2]; - matrix[4][3] = 0.0f; - } - - firstTime = false; + VGfloat strength = this->strength(); + VGfloat weights[3]; + VGfloat invweights[3]; + VGfloat alpha = c.alphaF(); + weights[0] = c.redF() * alpha; + weights[1] = c.greenF() * alpha; + weights[2] = c.blueF() * alpha; + invweights[0] = (1.0f - weights[0]) * strength; + invweights[1] = (1.0f - weights[1]) * strength; + invweights[2] = (1.0f - weights[2]) * strength; + + // Grayscale weights. + static const VGfloat redGray = 11.0f / 32.0f; + static const VGfloat greenGray = 16.0f / 32.0f; + static const VGfloat blueGray = 1.0f - (redGray + greenGray); + + VGfloat matrix[5][4]; + matrix[0][0] = redGray * invweights[0] + (1.0f - strength); + matrix[0][1] = redGray * invweights[1]; + matrix[0][2] = redGray * invweights[2]; + matrix[0][3] = 0.0f; + matrix[1][0] = greenGray * invweights[0]; + matrix[1][1] = greenGray * invweights[1] + (1.0f - strength); + matrix[1][2] = greenGray * invweights[2]; + matrix[1][3] = 0.0f; + matrix[2][0] = blueGray * invweights[0]; + matrix[2][1] = blueGray * invweights[1]; + matrix[2][2] = blueGray * invweights[2] + (1.0f - strength); + matrix[2][3] = 0.0f; + matrix[3][0] = 0.0f; + matrix[3][1] = 0.0f; + matrix[3][2] = 0.0f; + matrix[3][3] = 1.0f; + matrix[4][0] = weights[0] * strength; + matrix[4][1] = weights[1] * strength; + matrix[4][2] = weights[2] * strength; + matrix[4][3] = 0.0f; vgColorMatrix(dstImage, srcImage, matrix[0]); |