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SampleCIScrollableView.m

/*

     File: SampleCIScrollableView.m

 Abstract: The SampleCIScrollableView builds on the SimpleCIView from other Core Image sample codes. It is modified to support scrolling by setting up the OpenGL coordinate system accordingly.

  Version: 1.3

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*/

#import "SampleCIScrollableView.h"

#import <OpenGL/OpenGL.h>

#import <OpenGL/gl.h>

@interface SampleCIScrollableView (internalCalls)

- (BOOL)displaysWhenScreenProfileChanges;

- (void)viewWillMoveToWindow:(NSWindow*)newWindow;

- (void)displayProfileChanged:(NSNotification*)notification;

@end

@implementation SampleCIScrollableView

+ (NSOpenGLPixelFormat *)defaultPixelFormat

    static NSOpenGLPixelFormat *pf;

    if (pf == nil)

        /* Making sure the context's pixel format doesn't have a recovery

         * renderer is important - otherwise CoreImage may not be able to

         * create deeper context's that share textures with this one. */

        static const NSOpenGLPixelFormatAttribute attr[] = {

            NSOpenGLPFAAccelerated,

            NSOpenGLPFANoRecovery,

            NSOpenGLPFAColorSize, 32,

#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5

            NSOpenGLPFAAllowOfflineRenderers,  /* allow use of offline renderers               */

#endif

};

        pf = [[NSOpenGLPixelFormat alloc] initWithAttributes:(void *)&attr];

    return pf;

- (void)dealloc

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [_image release];

    [_contextOptions release];

    [_context release];

    [super dealloc];

- (void)setContextOptions:(NSDictionary *)dict

    [_contextOptions release];

    _contextOptions = [dict retain];

    [_context release];

    _context = nil;

- (CIImage *)image

    return [[_image retain] autorelease];

- (void)setImage:(CIImage *)image dirtyRect:(CGRect)r

    if (_image != image)

        [_image release];

        _image = [image retain];

        if (CGRectIsInfinite (r))

            [self setNeedsDisplay:YES];

        else

            [self setNeedsDisplayInRect:*(NSRect *)&r];

- (void)setImage:(CIImage *)image

    [self setImage:image dirtyRect:CGRectInfinite];

- (void)prepareOpenGL

    GLint parm = 1;

    /* Enable beam-synced updates. */

    [[self openGLContext] setValues:&parm forParameter:NSOpenGLCPSwapInterval];

    /* Make sure that everything we don't need is disabled. Some of these

     * are enabled by default and can slow down rendering. */

    glDisable (GL_ALPHA_TEST);

    glDisable (GL_DEPTH_TEST);

    glDisable (GL_SCISSOR_TEST);

    glDisable (GL_BLEND);

    glDisable (GL_DITHER);

    glDisable (GL_CULL_FACE);

    glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);

    glDepthMask (GL_FALSE);

    glStencilMask (0);

    glClearColor (0.0f, 0.0f, 0.0f, 0.0f);

    glHint (GL_TRANSFORM_HINT_APPLE, GL_FASTEST);

    _needsReshape = YES;

- (void)reshape     // scrolled, moved or resized

    _needsReshape = YES;    // reset the viewport etc. on the next draw

- (void)updateMatrices

    NSRect  visibleRect = [self visibleRect];

    NSRect  mappedVisibleRect = NSIntegralRect([self convertRect: visibleRect toView: [self enclosingScrollView]]);

    [[self openGLContext] update];

    /* Install an orthographic projection matrix (no perspective)

     * with the origin in the bottom left and one unit equal to one

     * device pixel. */

    glViewport (0, 0,mappedVisibleRect.size.width, mappedVisibleRect.size.height);

    glMatrixMode (GL_PROJECTION);

    glLoadIdentity ();

    glOrtho(visibleRect.origin.x,

        visibleRect.origin.x + visibleRect.size.width,

        visibleRect.origin.y,

        visibleRect.origin.y + visibleRect.size.height,

        -1, 1);

    glMatrixMode (GL_MODELVIEW);

    glLoadIdentity ();

    _needsReshape = NO;

- (BOOL)displaysWhenScreenProfileChanges

    return YES;

- (void)viewWillMoveToWindow:(NSWindow*)newWindow

    NSNotificationCenter* center = [NSNotificationCenter defaultCenter];

    [center removeObserver:self name:NSWindowDidChangeScreenProfileNotification object:nil];

    [center addObserver:self selector:@selector(displayProfileChanged:) name:NSWindowDidChangeScreenProfileNotification object:newWindow];

    [center addObserver:self selector:@selector(displayProfileChanged:) name:NSWindowDidMoveNotification object:newWindow];

    // When using OpenGL, we should disable the window's "one-shot" feature

    [newWindow setOneShot:NO];

- (void)displayProfileChanged:(NSNotification*)notification

    CGDirectDisplayID oldDid = _did;

    _did = (CGDirectDisplayID)[[[[[self window] screen] deviceDescription] objectForKey:@"NSScreenNumber"] pointerValue];

    if(_did == oldDid)

        return;

    _cglContext = [[self openGLContext] CGLContextObj];

    if(_pf == nil)

        _pf = [self pixelFormat];

        if (_pf == nil)

            _pf = [[self class] defaultPixelFormat];

    CGLLockContext(_cglContext);

        // Create a new CIContext using the new output color space

        [_context release];

#if MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_5

        // For 10.6 onwards we use the new API but do not pass in a colorspace as.

        // Since the cgl context will be rendered to the display, it is valid to rely on CI to get the colorspace from the context.

        _context = [[CIContext contextWithCGLContext:_cglContext pixelFormat:[_pf CGLPixelFormatObj] colorSpace:nil options:_contextOptions] retain];

#else

        CMProfileRef displayProfile = NULL;

        CGColorSpaceRef displayColorSpace = NULL;

        // Ask ColorSync for our current display's profile

        CMGetProfileByAVID((CMDisplayIDType)_did, &displayProfile);

        displayColorSpace = CGColorSpaceCreateWithPlatformColorSpace(displayProfile);

        CMCloseProfile(displayProfile);

        if(_contextOptions)

            [(NSMutableDictionary*)_contextOptions setObject:(id)displayColorSpace forKey:kCIContextOutputColorSpace];

        } else {

            //_contextOptions = [[NSDictionary dictionaryWithObject:(id)displayColorSpace forKey:kCIContextOutputColorSpace] retain];

        _context = [[CIContext contextWithCGLContext:_cglContext pixelFormat:[_pf CGLPixelFormatObj] options:_contextOptions] retain];

        CGColorSpaceRelease(displayColorSpace);

#endif

    CGLUnlockContext(_cglContext);

- (void)drawRect:(NSRect)r

    CGRect ir;

    CGImageRef cgImage;

    [[self openGLContext] makeCurrentContext];

    if ([NSGraphicsContext currentContextDrawingToScreen])

        if (_needsReshape)

            [self updateMatrices];

            r = [self visibleRect];

            glClear (GL_COLOR_BUFFER_BIT);

        ir = CGRectIntegral (*(CGRect *)&r);

        if ([self respondsToSelector:@selector (drawRect:inCIContext:)])

            [self drawRect:*(NSRect *)&ir inCIContext:[self ciContext]];

        else if (_image != nil)

            [_context drawImage:_image atPoint:ir.origin fromRect:ir];

        /* Flush the OpenGL command stream. If the view is double

         * buffered this should be replaced by [[self openGLContext]

         * flushBuffer]. */

        glFlush ();

    else

        /* Printing the view contents. Render using CG, not OpenGL. */

        ir = CGRectIntegral (*(CGRect *)&r);

        if ([self respondsToSelector:@selector (drawRect:inCIContext:)])

            [self drawRect:*(NSRect *)&ir inCIContext:[self ciContext]];

        else if (_image != nil)

            cgImage = [[self ciContext] createCGImage:_image fromRect:ir format:kCIFormatRGBA16 colorSpace:nil];

            if (cgImage != NULL)

                CGContextDrawImage ([[NSGraphicsContext currentContext]

                     graphicsPort], ir, cgImage);

                CGImageRelease (cgImage);

- (CIContext*)ciContext

    /* Allocate a CoreImage rendering context using the view's OpenGL

     * context as its destination if none already exists.

     * Make sure this is done before somebody queries the ciContext. */

    if (_context == nil)

        [self displayProfileChanged:nil];

    return _context;

@end

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