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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<pre class="sourcecodebox">/*
File: main.m
Abstract: A command-line tool that uses the QCRenderer API to render a
Quartz Composer composition offscreen on the video card using an OpenGL
pBuffer, download the pixels data, then save the frames to disk as
separate compressed TIFF files.
Version: 1.0
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
Computer, Inc. ("Apple") in consideration of your agreement to the
following terms, and your use, installation, modification or
redistribution of this Apple software constitutes acceptance of these
terms. If you do not agree with these terms, please do not use,
install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Computer,
Inc. may be used to endorse or promote products derived from the Apple
Software without specific prior written permission from Apple. Except
as expressly stated in this notice, no other rights or licenses, express
or implied, are granted by Apple herein, including but not limited to
any patent rights that may be infringed by your derivative works or by
other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright © 2005 Apple Computer, Inc., All Rights Reserved
*/
#import <AppKit/AppKit.h>
#import <Quartz/Quartz.h>
#import <OpenGL/CGLMacro.h>
@interface OfflineRenderer : NSObject
{
NSOpenGLPixelBuffer* _pixelBuffer;
NSOpenGLContext* _openGLContext;
QCRenderer* _renderer;
void* _scratchBufferPtr;
unsigned _scratchBufferRowBytes;
}
- (id) initWithCompositionPath:(NSString*)path pixelsWide:(unsigned)width pixelsHigh:(unsigned)height;
- (NSBitmapImageRep*) bitmapImageForTime:(NSTimeInterval)time;
@end
@implementation OfflineRenderer
- (id) init
{
return [self initWithCompositionPath:nil pixelsWide:0 pixelsHigh:0];
}
- (id) initWithCompositionPath:(NSString*)path pixelsWide:(unsigned)width pixelsHigh:(unsigned)height
{
NSOpenGLPixelFormatAttribute attributes[] = {
NSOpenGLPFAPixelBuffer,
NSOpenGLPFANoRecovery,
NSOpenGLPFAAccelerated,
NSOpenGLPFADepthSize, 24,
(NSOpenGLPixelFormatAttribute) 0
};
NSOpenGLPixelFormat* format = [[[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease];
//Check parameters - Rendering at sizes smaller than 16x16 will likely produce garbage
if(![path length] || (width < 16) || (height < 16)) {
[self release];
return nil;
}
if(self = [super init]) {
//Create the OpenGL pixel buffer to render into
_pixelBuffer = [[NSOpenGLPixelBuffer alloc] initWithTextureTarget:GL_TEXTURE_RECTANGLE_EXT textureInternalFormat:GL_RGBA textureMaxMipMapLevel:0 pixelsWide:width pixelsHigh:height];
if(_pixelBuffer == nil) {
NSLog(@"Cannot create OpenGL pixel buffer");
[self release];
return nil;
}
//Create the OpenGL context to render with (with color and depth buffers)
_openGLContext = [[NSOpenGLContext alloc] initWithFormat:format shareContext:nil];
if(_openGLContext == nil) {
NSLog(@"Cannot create OpenGL context");
[self release];
return nil;
}
[_openGLContext setPixelBuffer:_pixelBuffer cubeMapFace:0 mipMapLevel:0 currentVirtualScreen:[_openGLContext currentVirtualScreen]];
//Create the QuartzComposer Renderer with that OpenGL context and the specified composition file
_renderer = [[QCRenderer alloc] initWithOpenGLContext:_openGLContext pixelFormat:format file:path];
if(_renderer == nil) {
NSLog(@"Cannot create QCRenderer");
[self release];
return nil;
}
//Create a scratch buffer used to downloads the pixels from the OpenGL pixel buffer - For optimal performances the buffer is paged-aligned and the rowbytes is a multiple of 64 bytes
_scratchBufferRowBytes = (width * 4 + 63) & ~63;
_scratchBufferPtr = valloc(height * _scratchBufferRowBytes);
if(_scratchBufferPtr == NULL) {
[self release];
return nil;
}
}
return self;
}
- (NSBitmapImageRep*) bitmapImageForTime:(NSTimeInterval)time
{
//IMPORTANT: We use the macros provided by <OpenGL/CGLMacro.h> which provide better performances and allows us not to bother with making sure the current context is valid
CGLContextObj cgl_ctx = [_openGLContext CGLContextObj];
int width = [_pixelBuffer pixelsWide],
height = [_pixelBuffer pixelsHigh],
bitmapRowBytes = 4 * width;
NSBitmapImageRep* bitmap;
GLint save;
int i;
//Render a frame from the composition at the specified time
if(![_renderer renderAtTime:time arguments:nil])
return nil;
//Read pixels back from the OpenGL pixel buffer in ARGB 32 bits format - For extra safety, we save / restore the OpenGL states we change
glGetIntegerv(GL_PACK_ROW_LENGTH, &save);
glPixelStorei(GL_PACK_ROW_LENGTH, _scratchBufferRowBytes / 4);
glReadPixels(0, 0, width, height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, _scratchBufferPtr);
glPixelStorei(GL_PACK_ROW_LENGTH, save);
if(glGetError())
return nil;
//User NSBitmapImageRep to allocate a memory buffer of ARGB 32 bits pixels - We use the "NSCalibratedRGBColorSpace" so that no color profile is embedded in the bitmap
bitmap = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL pixelsWide:width pixelsHigh:height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES isPlanar:NO colorSpaceName:NSCalibratedRGBColorSpace bitmapFormat:NSAlphaFirstBitmapFormat bytesPerRow:bitmapRowBytes bitsPerPixel:32];
if(bitmap == nil)
return nil;
//Copy the pixels line by line from the scratch buffer to the bitmap and flip vertically - OpenGL downloaded images are upside-down
for(i = 0; i < height; ++i)
bcopy(_scratchBufferPtr + i * _scratchBufferRowBytes, (char*)[bitmap bitmapData] + (height - i - 1) * bitmapRowBytes, bitmapRowBytes);
return [bitmap autorelease];
}
- (void) dealloc
{
//Destroy the scratch buffer
if(_scratchBufferPtr)
free(_scratchBufferPtr);
//Destroy the renderer
[_renderer release];
//Destroy the OpenGL context
[_openGLContext clearDrawable];
[_openGLContext release];
//Destroy the OpenGL pixel buffer
[_pixelBuffer release];
[super dealloc];
}
@end
int main(int argc, const char* argv[])
{
NSAutoreleasePool* pool = [NSAutoreleasePool new];
NSString* compositionPath;
NSString* folderPath;
OfflineRenderer* renderer;
NSBitmapImageRep* bitmapImage;
NSTimeInterval time;
NSData* tiffData;
NSString* fileName;
//Make sure we have the correct number of arguments
if(argc == 3) {
//Process the arguments
compositionPath = [[NSString stringWithUTF8String:argv[1]] stringByExpandingTildeInPath];
folderPath = [[NSString stringWithUTF8String:argv[2]] stringByExpandingTildeInPath];
//Create an offline renderer
renderer = [[OfflineRenderer alloc] initWithCompositionPath:compositionPath pixelsWide:640 pixelsHigh:480];
if(renderer) {
//Render a frame every second for 10 seconds and save the resulting images as LZW compressed TIFF files
printf("Rendering composition \"%s\"...\n", [[compositionPath lastPathComponent] UTF8String]);
for(time = 0.0; time <= 10.0; time += 1.0) {
bitmapImage = [renderer bitmapImageForTime:time];
if(bitmapImage) {
tiffData = [bitmapImage TIFFRepresentationUsingCompression:NSTIFFCompressionLZW factor:1.0];
fileName = [NSString stringWithFormat:@"%@-%g.tiff", [[compositionPath lastPathComponent] stringByDeletingPathExtension], time];
if([tiffData writeToFile:[folderPath stringByAppendingPathComponent:fileName] atomically:YES])
printf("\tRendered image \"%s\" at time %.3f\n", [fileName UTF8String], time);
else
NSLog(@"Image writing to disk failed (%s)", fileName);
}
else
NSLog(@"Image rendering at time %f failed", time);
}
printf("...done!\n");
[renderer release];
}
else
NSLog(@"Offline renderer creation for composition failed (%@)", compositionPath);
}
else
printf("Usage: %s sourceComposition destinationFolder\n", basename(argv[0]));
[pool release];
return 0;
}
</pre>
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