jens@0: /*  This code is based on Apple's "GeekGameBoard" sample code, version 1.0.
jens@0:     http://developer.apple.com/samplecode/GeekGameBoard/
jens@0:     Copyright © 2007 Apple Inc. Copyright © 2008 Jens Alfke. All Rights Reserved.
jens@0: 
jens@0:     Redistribution and use in source and binary forms, with or without modification, are permitted
jens@0:     provided that the following conditions are met:
jens@0: 
jens@0:     * Redistributions of source code must retain the above copyright notice, this list of conditions
jens@0:       and the following disclaimer.
jens@0:     * Redistributions in binary form must reproduce the above copyright notice, this list of
jens@0:       conditions and the following disclaimer in the documentation and/or other materials provided
jens@0:       with the distribution.
jens@0: 
jens@0:     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
jens@0:     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
jens@0:     FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRI-
jens@0:     BUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
jens@0:     (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
jens@0:     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
jens@0:     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
jens@0:     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
jens@0: */
jens@0: #import "QuartzUtils.h"
jens@0: 
jens@0: 
jens@0: CGColorRef kBlackColor, kWhiteColor, 
jens@0:            kTranslucentGrayColor, kTranslucentLightGrayColor,
jens@0:            kAlmostInvisibleWhiteColor,
jens@0:            kHighlightColor;
jens@0: 
jens@0: 
jens@0: __attribute__((constructor))        // Makes this function run when the app loads
jens@0: static void InitQuartzUtils()
jens@0: {
jens@0:     kBlackColor = CGColorCreateGenericGray(0.0, 1.0);
jens@0:     kWhiteColor = CGColorCreateGenericGray(1.0, 1.0);
jens@0:     kTranslucentGrayColor = CGColorCreateGenericGray(0.0, 0.5);
jens@0:     kTranslucentLightGrayColor = CGColorCreateGenericGray(0.0, 0.25);
jens@0:     kAlmostInvisibleWhiteColor = CGColorCreateGenericGray(1, 0.05);
jens@0:     kHighlightColor = CGColorCreateGenericRGB(1, 1, 0, 0.5);
jens@0: }
jens@0: 
jens@0: 
jens@0: void ChangeSuperlayer( CALayer *layer, CALayer *newSuperlayer, int index )
jens@0: {
jens@0:     // Disable actions, else the layer will move to the wrong place and then back!
jens@0:     [CATransaction flush];
jens@0:     [CATransaction begin];
jens@0:     [CATransaction setValue:(id)kCFBooleanTrue
jens@0:                      forKey:kCATransactionDisableActions];
jens@0: 
jens@0:     CGPoint pos = [newSuperlayer convertPoint: layer.position 
jens@0:                       fromLayer: layer.superlayer];
jens@0:     [layer retain];
jens@0:     [layer removeFromSuperlayer];
jens@0:     if( index >= 0 )
jens@0:         [newSuperlayer insertSublayer: layer atIndex: index];
jens@0:     else
jens@0:         [newSuperlayer addSublayer: layer];
jens@0:     layer.position = pos;
jens@0:     [layer release];
jens@0: 
jens@0:     [CATransaction commit];
jens@0: }
jens@0: 
jens@0: 
jens@0: void RemoveImmediately( CALayer *layer )
jens@0: {
jens@0:     [CATransaction flush];
jens@0:     [CATransaction begin];
jens@0:     [CATransaction setValue:(id)kCFBooleanTrue
jens@0:                      forKey:kCATransactionDisableActions];
jens@0:     [layer removeFromSuperlayer];
jens@0:     [CATransaction commit];
jens@0: }    
jens@0: 
jens@0: 
jens@0: CATextLayer* AddTextLayer( CALayer *superlayer,
jens@0:                            NSString *text, NSFont* font,
jens@0:                            enum CAAutoresizingMask align )
jens@0: {
jens@0:     CATextLayer *label = [[CATextLayer alloc] init];
jens@0:     label.string = text;
jens@0:     label.font = font;
jens@0:     label.fontSize = font.pointSize;
jens@0:     label.foregroundColor = kBlackColor;
jens@0:     
jens@0:     NSString *mode;
jens@0:     if( align & kCALayerWidthSizable )
jens@0:         mode = @"center";
jens@0:     else if( align & kCALayerMinXMargin )
jens@0:         mode = @"right";
jens@0:     else
jens@0:         mode = @"left";
jens@0:     align |= kCALayerWidthSizable;
jens@0:     label.alignmentMode = mode;
jens@0:     
jens@0:     CGFloat inset = superlayer.borderWidth + 3;
jens@0:     CGRect bounds = CGRectInset(superlayer.bounds, inset, inset);
jens@0:     CGFloat height = font.ascender;
jens@0:     CGFloat y = bounds.origin.y;
jens@0:     if( align & kCALayerHeightSizable )
jens@0:         y += (bounds.size.height-height)/2.0;
jens@0:     else if( align & kCALayerMinYMargin )
jens@0:         y += bounds.size.height - height;
jens@0:     align &= ~kCALayerHeightSizable;
jens@0:     label.bounds = CGRectMake(0, font.descender,
jens@0:                               bounds.size.width, height - font.descender);
jens@0:     label.position = CGPointMake(bounds.origin.x,y+font.descender);
jens@0:     label.anchorPoint = CGPointMake(0,0);
jens@0:     
jens@0:     label.autoresizingMask = align;
jens@0:     [superlayer addSublayer: label];
jens@0:     [label release];
jens@0:     return label;
jens@0: }
jens@0: 
jens@0: 
jens@0: CGImageRef CreateCGImageFromFile( NSString *path )
jens@0: {
jens@0:     CGImageRef image = NULL;
jens@0:     CFURLRef url = (CFURLRef) [NSURL fileURLWithPath: path];
jens@0:     CGImageSourceRef src = CGImageSourceCreateWithURL(url, NULL);
jens@0:     if( src ) {
jens@0:         image = CGImageSourceCreateImageAtIndex(src, 0, NULL);
jens@0:         CFRelease(src);
jens@0:         if(!image) NSLog(@"Warning: CGImageSourceCreateImageAtIndex failed on file %@ (ptr size=%u)",path,sizeof(void*));
jens@0:     }
jens@0:     return image;
jens@0: }
jens@0: 
jens@0: 
jens@0: CGImageRef GetCGImageNamed( NSString *name )
jens@0: {
jens@0:     // For efficiency, loaded images are cached in a dictionary by name.
jens@0:     static NSMutableDictionary *sMap;
jens@0:     if( ! sMap )
jens@0:         sMap = [[NSMutableDictionary alloc] init];
jens@0:     
jens@0:     CGImageRef image = (CGImageRef) [sMap objectForKey: name];
jens@0:     if( ! image ) {
jens@0:         // Hasn't been cached yet, so load it:
jens@0:         NSString *path;
jens@0:         if( [name hasPrefix: @"/"] )
jens@0:             path = name;
jens@0:         else {
jens@0:             path = [[NSBundle mainBundle] pathForResource: name ofType: nil];
jens@0:             NSCAssert1(path,@"Couldn't find bundle image resource '%@'",name);
jens@0:         }
jens@0:         image = CreateCGImageFromFile(path);
jens@0:         NSCAssert1(image,@"Failed to load image from %@",path);
jens@0:         [sMap setObject: (id)image forKey: name];
jens@0:         CGImageRelease(image);
jens@0:     }
jens@0:     return image;
jens@0: }
jens@0: 
jens@0: 
jens@0: CGColorRef GetCGPatternNamed( NSString *name )         // can be resource name or abs. path
jens@0: {
jens@0:     // For efficiency, loaded patterns are cached in a dictionary by name.
jens@0:     static NSMutableDictionary *sMap;
jens@0:     if( ! sMap )
jens@0:         sMap = [[NSMutableDictionary alloc] init];
jens@0:     
jens@0:     CGColorRef pattern = (CGColorRef) [sMap objectForKey: name];
jens@0:     if( ! pattern ) {
jens@0:         pattern = CreatePatternColor( GetCGImageNamed(name) );
jens@0:         [sMap setObject: (id)pattern forKey: name];
jens@0:         CGColorRelease(pattern);
jens@0:     }
jens@0:     return pattern;
jens@0: }
jens@0: 
jens@0: 
jens@0: CGImageRef GetCGImageFromPasteboard( NSPasteboard *pb )
jens@0: {
jens@0:     CGImageSourceRef src = NULL;
jens@0:     NSArray *paths = [pb propertyListForType: NSFilenamesPboardType];
jens@0:     if( paths.count==1 ) {
jens@0:         // If a file is being dragged, read it:
jens@0:         CFURLRef url = (CFURLRef) [NSURL fileURLWithPath: [paths objectAtIndex: 0]];
jens@0:         src = CGImageSourceCreateWithURL(url, NULL);
jens@0:     } else {
jens@0:         // Else look for an image type:
jens@0:         NSString *type = [pb availableTypeFromArray: [NSImage imageUnfilteredPasteboardTypes]];
jens@0:         if( type ) {
jens@0:             NSData *data = [pb dataForType: type];
jens@0:             src = CGImageSourceCreateWithData((CFDataRef)data, NULL);
jens@0:         }
jens@0:     }
jens@0:     if(src) {
jens@0:         CGImageRef image = CGImageSourceCreateImageAtIndex(src, 0, NULL);
jens@0:         CFRelease(src);
jens@0:         return image;
jens@0:     } else
jens@0:         return NULL;
jens@0: }    
jens@0: 
jens@0: 
jens@0: float GetPixelAlpha( CGImageRef image, CGSize imageSize, CGPoint pt )
jens@0: {
jens@0:     // Trivial reject:
jens@0:     if( pt.x<0 || pt.x>=imageSize.width || pt.y<0 || pt.y>=imageSize.height )
jens@0:         return 0.0;
jens@0:     
jens@0:     // sTinyContext is a 1x1 CGBitmapContext whose pixmap stores only alpha.
jens@0:     static UInt8 sPixel[1];
jens@0:     static CGContextRef sTinyContext;
jens@0:     if( ! sTinyContext ) {
jens@0:         sTinyContext = CGBitmapContextCreate(sPixel, 1, 1, 
jens@0:                                              8, 1,     // bpp, rowBytes
jens@0:                                              NULL,
jens@0:                                              kCGImageAlphaOnly);
jens@0:         CGContextSetBlendMode(sTinyContext, kCGBlendModeCopy);
jens@0:     }
jens@0:     
jens@0:     // Draw the image into sTinyContext, positioned so the desired point is at
jens@0:     // (0,0), then examine the alpha value in the pixmap:
jens@0:     CGContextDrawImage(sTinyContext, 
jens@0:                        CGRectMake(-pt.x,-pt.y, imageSize.width,imageSize.height),
jens@0:                        image);
jens@0:     return sPixel[0] / 255.0;
jens@0: }
jens@0: 
jens@0: 
jens@0: #pragma mark -
jens@0: #pragma mark PATTERNS:
jens@0: 
jens@0: 
jens@0: // callback for CreateImagePattern.
jens@0: static void drawPatternImage (void *info, CGContextRef ctx)
jens@0: {
jens@0:     CGImageRef image = (CGImageRef) info;
jens@0:     CGContextDrawImage(ctx, 
jens@0:                        CGRectMake(0,0, CGImageGetWidth(image),CGImageGetHeight(image)),
jens@0:                        image);
jens@0: }
jens@0: 
jens@0: // callback for CreateImagePattern.
jens@0: static void releasePatternImage( void *info )
jens@0: {
jens@0:     CGImageRelease( (CGImageRef)info );
jens@0: }
jens@0: 
jens@0: 
jens@0: CGPatternRef CreateImagePattern( CGImageRef image )
jens@0: {
jens@0:     NSCParameterAssert(image);
jens@0:     int width = CGImageGetWidth(image);
jens@0:     int height = CGImageGetHeight(image);
jens@0:     static const CGPatternCallbacks callbacks = {0, &drawPatternImage, &releasePatternImage};
jens@0:     return CGPatternCreate (image,
jens@0:                             CGRectMake (0, 0, width, height),
jens@0:                             CGAffineTransformMake (1, 0, 0, 1, 0, 0),
jens@0:                             width,
jens@0:                             height,
jens@0:                             kCGPatternTilingConstantSpacing,
jens@0:                             true,
jens@0:                             &callbacks);
jens@0: }
jens@0: 
jens@0: 
jens@0: CGColorRef CreatePatternColor( CGImageRef image )
jens@0: {
jens@0:     CGPatternRef pattern = CreateImagePattern(image);
jens@0:     CGColorSpaceRef space = CGColorSpaceCreatePattern(NULL);
jens@0:     CGFloat components[1] = {1.0};
jens@0:     CGColorRef color = CGColorCreateWithPattern(space, pattern, components);
jens@0:     CGColorSpaceRelease(space);
jens@0:     CGPatternRelease(pattern);
jens@0:     return color;
jens@0: }