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Optimized EGLFS backing store a bit. 

Avoid expensive image copying when possible.

Change-Id: Ia79919ea7652d7bfdd744198c494c20cb78a0f48
Reviewed-by: Donald Carr <donald.carr@nokia.com>
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>
bb10
Samuel Rødal 2012-04-17 08:46:13 +02:00 committed by Qt by Nokia
parent c12057df29
commit 197b423e96
1 changed files with 30 additions and 9 deletions
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39
src/plugins/platforms/eglfs/qeglfsbackingstore.cpp
View File

@ -145,16 +145,37 @@ void QEglFSBackingStore::flush(QWindow *window, const QRegion &region, const QPo
glBindTexture(GL_TEXTURE_2D, m_texture);
foreach (const QRect &rect, m_dirty.rects()) {
if (rect == m_image.rect()) {
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, m_image.constBits());
} else {
glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE,
m_image.copy(rect).constBits());
}
}
if (!m_dirty.isNull()) {
QRect imageRect = m_image.rect();
m_dirty = QRegion();
QRegion fixed;
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;
}
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);