void CGContextDrawLayerInRect(CGContextRef context, CGRect rect, CGLayerRef layer)
{
QPainter* painter = CGContextGetPainter(context);
QTransform tf = painter->worldTransform();
qreal sx, sy;
CGSize origSize = CGLayerGetSize(layer);
sx = CGRectGetWidth(rect) / origSize.width;
sy = CGRectGetHeight(rect) / origSize.height;
painter->scale(sx, sy);
painter->drawPicture(QPointF(rect.origin.x / sx, rect.origin.y / sy), *layer->picture);
painter->setWorldTransform(tf);
}
void doSimpleCGLayer(CGContextRef context)
{
int i,j;
CGSize s;
// Create the layer.
CGLayerRef layer = createCGLayerForDrawing(context);
if(layer == NULL){
fprintf(stderr, "Couldn't create layer!\n");
return;
}
// Get the size of the layer created.
s = CGLayerGetSize(layer);
// Clip to a rect that corresponds to
// a grid of 8x8 layer objects.
CGContextClipToRect(context, CGRectMake(0, 0, 8*s.width, 8*s.height));
// Paint 8 rows of layer objects.
for(j = 0 ; j < 8 ; j++){
CGContextSaveGState(context);
// Paint 4 columns of layer objects, moving
// across the drawing canvas by skipping a
// square on the grid each time across.
for(i = 0 ; i < 4 ; i++){
// Draw the layer at the current origin.
CGContextDrawLayerAtPoint(context,
CGPointZero,
layer);
// Translate across two layer widths.
CGContextTranslateCTM(context, 2*s.width, 0);
}
CGContextRestoreGState(context);
// Translate to the left one layer width on
// even loop counts and to the right one
// layer width on odd loop counts. Each
// time through the outer loop, translate up
// one layer height.
CGContextTranslateCTM(context,
(j % 2) ? s.width: -s.width,
s.height);
}
// Release the layer when done drawing with it.
CGLayerRelease(layer);
}
void TilePDFWithCGLayer(CGContextRef context, CFURLRef url)
{
// Again this should really be computed based on
// the area intended to be tiled.
float fillwidth = 612., fillheight = 792.;
CGSize s;
float tileX, tileY, tileOffsetX, tileOffsetY;
float w, h;
CGLayerRef layer = createLayerWithImageForContext(context, url);
if(layer == NULL){
fprintf(stderr, "Couldn't create the layer!\n");
return;
}
// Compute the tile size and offset.
s = CGLayerGetSize(layer);
tileX = s.width;
tileY = s.height;
#if DOSCALING
// Space the tiles by the tile width and height
// plus an extra 2 units in each dimension.
tileOffsetX = 2. + tileX;
tileOffsetY = 2. + tileY;
#else
// Add 6 units to the offset in each direction
// if there is no scaling of the source PDF document.
tileOffsetX = 6. + tileX;
tileOffsetY = 6. + tileY;
#endif
// Now draw the contents of the layer to the context.
// The layer is drawn at its true size (the size of
// the tile) with its origin located at the corner
// of each tile.
for(h = 0; h < fillheight ; h += tileOffsetY)
for(w = 0; w < fillwidth ; w += tileOffsetX){
CGContextDrawLayerAtPoint(context, CGPointMake(w, h), layer);
}
// Release the layer when done drawing with it.
CGLayerRelease(layer);
}
float CGLayerHeight_wrap(CGLayer* la) {
return CGLayerGetSize(la).height;
}
float CGLayerWidth_wrap(CGLayer* la) {
return CGLayerGetSize(la).width;
}