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Utils: making StyleHelper::drawCornerImage() dpi aware

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An image passed to drawCornerImage() can have any devicePixelRatio or
rather "its own imagePixel to userPixel ratio".

drawCornerImage() calls QPainter::drawImage and now passes it a source
rect in "image pixels" and a target rect in "user pixels".

Change-Id: Ia0d6459c1570ec5d4f87568e653526f738594f6e
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
This commit is contained in:
Alessandro Portale
2014-07-10 13:45:35 +02:00
parent f88b477062
commit 5a6a69b06f
1 changed files with 43 additions and 25 deletions
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68
src/libs/utils/stylehelper.cpp
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@@ -464,44 +464,62 @@ void StyleHelper::drawIconWithShadow(const QIcon &icon, const QRect &rect,
p->drawPixmap(targetRect, cache);
}
// Qt version migration wrapper for QImage::devicePixelRatioF
static qreal imageDevicePixelRatio(const QImage &image)
{
#if QT_VERSION < QT_VERSION_CHECK(5, 4, 0)
return image.devicePixelRatio();
#else // QT_VERSION < Qt 5.4.0
return image.devicePixelRatioF();
#endif // QT_VERSION < Qt 5.4.0
}
// Draws a CSS-like border image where the defined borders are not stretched
// Unit for rect, left, top, right and bottom is user pixels
void StyleHelper::drawCornerImage(const QImage &img, QPainter *painter, const QRect &rect,
int left, int top, int right, int bottom)
{
QSize size = img.size();
// source rect for drawImage() calls needs to be specified in DIP unit of the image
const qreal imagePixelRatio = imageDevicePixelRatio(img);
const qreal leftDIP = left * imagePixelRatio;
const qreal topDIP = top * imagePixelRatio;
const qreal rightDIP = right * imagePixelRatio;
const qreal bottomDIP = bottom * imagePixelRatio;
const QSize size = img.size();
if (top > 0) { //top
painter->drawImage(QRect(rect.left() + left, rect.top(), rect.width() -right - left, top), img,
QRect(left, 0, size.width() -right - left, top));
painter->drawImage(QRectF(rect.left() + left, rect.top(), rect.width() -right - left, top), img,
QRectF(leftDIP, 0, size.width() - rightDIP - leftDIP, topDIP));
if (left > 0) //top-left
painter->drawImage(QRect(rect.left(), rect.top(), left, top), img,
QRect(0, 0, left, top));
painter->drawImage(QRectF(rect.left(), rect.top(), left, top), img,
QRectF(0, 0, leftDIP, topDIP));
if (right > 0) //top-right
painter->drawImage(QRect(rect.left() + rect.width() - right, rect.top(), right, top), img,
QRect(size.width() - right, 0, right, top));
painter->drawImage(QRectF(rect.left() + rect.width() - right, rect.top(), right, top), img,
QRectF(size.width() - rightDIP, 0, rightDIP, topDIP));
}
//left
if (left > 0)
painter->drawImage(QRect(rect.left(), rect.top()+top, left, rect.height() - top - bottom), img,
QRect(0, top, left, size.height() - bottom - top));
painter->drawImage(QRectF(rect.left(), rect.top()+top, left, rect.height() - top - bottom), img,
QRectF(0, topDIP, leftDIP, size.height() - bottomDIP - topDIP));
//center
painter->drawImage(QRect(rect.left() + left, rect.top()+top, rect.width() -right - left,
rect.height() - bottom - top), img,
QRect(left, top, size.width() -right -left,
size.height() - bottom - top));
painter->drawImage(QRectF(rect.left() + left, rect.top()+top, rect.width() -right - left,
rect.height() - bottom - top), img,
QRectF(leftDIP, topDIP, size.width() - rightDIP - leftDIP,
size.height() - bottomDIP - topDIP));
if (right > 0) //right
painter->drawImage(QRect(rect.left() +rect.width() - right, rect.top()+top, right, rect.height() - top - bottom), img,
QRect(size.width() - right, top, right, size.height() - bottom - top));
painter->drawImage(QRectF(rect.left() +rect.width() - right, rect.top()+top, right, rect.height() - top - bottom), img,
QRectF(size.width() - rightDIP, topDIP, rightDIP, size.height() - bottomDIP - topDIP));
if (bottom > 0) { //bottom
painter->drawImage(QRect(rect.left() +left, rect.top() + rect.height() - bottom,
rect.width() - right - left, bottom), img,
QRect(left, size.height() - bottom,
size.width() - right - left, bottom));
if (left > 0) //bottom-left
painter->drawImage(QRect(rect.left(), rect.top() + rect.height() - bottom, left, bottom), img,
QRect(0, size.height() - bottom, left, bottom));
if (right > 0) //bottom-right
painter->drawImage(QRect(rect.left() + rect.width() - right, rect.top() + rect.height() - bottom, right, bottom), img,
QRect(size.width() - right, size.height() - bottom, right, bottom));
painter->drawImage(QRectF(rect.left() +left, rect.top() + rect.height() - bottom,
rect.width() - right - left, bottom), img,
QRectF(leftDIP, size.height() - bottomDIP,
size.width() - rightDIP - leftDIP, bottomDIP));
if (left > 0) //bottom-left
painter->drawImage(QRectF(rect.left(), rect.top() + rect.height() - bottom, left, bottom), img,
QRectF(0, size.height() - bottomDIP, leftDIP, bottomDIP));
if (right > 0) //bottom-right
painter->drawImage(QRectF(rect.left() + rect.width() - right, rect.top() + rect.height() - bottom, right, bottom), img,
QRectF(size.width() - rightDIP, size.height() - bottomDIP, rightDIP, bottomDIP));
}
}