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Update only dirty areas in kms backingstore

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Do not upload the entire (typically fullscreen) image
all the time.

Taken from eglfs' backingstore implementation.

Change-Id: I53db5cf54577ebea715d6cbd7215b9d2154e8960
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>
This commit is contained in:
Laszlo Agocs 2012-07-25 11:52:07 +03:00 committed by Qt by Nokia
parent 189a5d8af1
commit 770175045a
2 changed files with 36 additions and 3 deletions
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38
src/plugins/platforms/kms/qkmsbackingstore.cpp
View File

@ -73,8 +73,9 @@ QPaintDevice *QKmsBackingStore::paintDevice()
return &m_image;
}
void QKmsBackingStore::beginPaint(const QRegion &)
void QKmsBackingStore::beginPaint(const QRegion &rgn)
{
m_dirty |= rgn;
}
void QKmsBackingStore::endPaint()
@ -146,8 +147,39 @@ void QKmsBackingStore::flush(QWindow *window, const QRegion &region, const QPoin
glBindTexture(GL_TEXTURE_2D, m_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_image.width(), m_image.height(),
0, GL_RGBA, GL_UNSIGNED_BYTE, m_image.constScanLine(0));
if (!m_dirty.isNull()) {
QRect imageRect = m_image.rect();
QRegion fixed;
Q_FOREACH (const QRect &rect, m_dirty.rects()) {
// intersect with image rect to be sure
QRect r = imageRect & rect;
// if the rect is wide enough it's cheaper to just
// extend it instead of doing an image copy
if (r.width() >= imageRect.width() / 2) {
r.setX(0);
r.setWidth(imageRect.width());
}
fixed |= r;
}
Q_FOREACH (const QRect &rect, fixed.rects()) {
// if the sub-rect is full-width we can pass the image data directly to
// OpenGL instead of copying, since there's no gap between scanlines
if (rect.width() == imageRect.width()) {
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(),
rect.width(), rect.height(),
GL_RGBA, GL_UNSIGNED_BYTE,
m_image.constScanLine(rect.y()));
} else {
glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(),
rect.width(), rect.height(),
GL_RGBA, GL_UNSIGNED_BYTE,
m_image.copy(rect).constBits());
}
}
m_dirty = QRegion();
}
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

1
src/plugins/platforms/kms/qkmsbackingstore.h
View File

@ -69,6 +69,7 @@ private:
QImage m_image;
uint m_texture;
QOpenGLShaderProgram *m_program;
QRegion m_dirty;
};
QT_END_NAMESPACE