Question

我正在Mac上实现一个Photoshop插件，我正在使用Cocoa。到目前为止一切正常，但下一步是提供一个“预览”图像，作为我的插件窗口的一部分，我被卡住了。我是一个n00b的Obj-C程序员，实际上没有帮助:-)

到目前为止，我有这样的事情：

int dataSize = gFilterRecord->bigDocumentData->wholeSize32.v *
               gFilterRecord->bigDocumentData->wholeSize32.h *
               gFilterRecord->planes; 

NSData *inData = [[NSData alloc] initWithBytesNoCopy:gFilterRecord->inData length:dataSize freeWhenDone:NO];
NSLog(@"LoadImageFromSDK : Data created");
NSImage *imageTmp = [[NSImage alloc] initWithData:inData];
NSLog(@"LoadImageFromSDK : Image created");

//Save to PNG file as a test of this image creation
[[imageTmp TIFFRepresentation] writeToFile:@"/tmp/imageTmp.tif" atomically:YES];
NSLog(@"LoadImageFromSDK : Wrote image to disk");

此刻，它可怕地崩溃：
09/07/22 10:23:32 AM Adobe Photoshop Elements [46628] *** NSCopyMemoryPages（0x0,0x245f4000,2265088）失败

我可能错误地计算了inData的大小。救命？

另外，NSImage是否能够正确解释图像数据blob？或者我应该放弃它，只是逐像素映射到NSImage？

Answer 1

好吧，这比我预想的更痛苦。另外，感谢NVidia发布此PDF，这是对Photoshop SDK过滤器记录的更好解释，而不是实际的SDK文档。

除了用于调试目的的示例tif文件之外，这段代码实际上读取了inData并产生了一个可用的NSImage（大量的日志记录只是为了弄清楚它在做什么，随意删除）。

NSLog(@"Entering LoadImageFromSDK");

unsigned char *bitmapPlanes[4];    
bitmapPlanes[0] = (unsigned char *) (gFilterRecord->inData);

NSLog(@"Params to create bitmap");
NSLog(@"pixelsWide = %d", gFilterRecord->bigDocumentData->imageSize32.h );
NSLog(@"pixelsHigh = %d", gFilterRecord->bigDocumentData->imageSize32.v );
NSLog(@"bitsPerSample = %d", gFilterRecord->depth );
NSLog(@"samplesPerPixel = %d", gFilterRecord->planes );
NSLog(@"hasAlpha = %d", NO );
NSLog(@"isPlanar = %d", NO );
NSLog(@"colorSpaceName = %@", mapImageModeToColorSpace(gFilterRecord->imageMode) );
NSLog(@"bytesPerRow = %d", gFilterRecord->inRowBytes );
NSLog(@"bitsPerPixel = %d", gFilterRecord->depth*gFilterRecord->planes );    

NSBitmapImageRep *bitmapTmp = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:bitmapPlanes
                                                                      pixelsWide:gFilterRecord->bigDocumentData->imageSize32.h
                                                                      pixelsHigh:gFilterRecord->bigDocumentData->imageSize32.v
                                                                   bitsPerSample:gFilterRecord->depth
                                                                 samplesPerPixel:gFilterRecord->planes
                                                                        hasAlpha:NO 
                                                                        isPlanar:NO 
                                                                  colorSpaceName:mapImageModeToColorSpace(gFilterRecord->imageMode) 
                                                                     bytesPerRow:gFilterRecord->inRowBytes
                                                                    bitsPerPixel:gFilterRecord->depth*gFilterRecord->planes];

NSLog(@"LoadImageFromSDK : Bitmap created = %@", bitmapTmp);

[[bitmapTmp TIFFRepresentation] writeToFile:@"/Users/someuser/temp/sample.tif" atomically:YES];


NSImage *imageTmp = [[NSImage alloc] initWithSize:[bitmapTmp size]];
[imageTmp addRepresentation:bitmapTmp];
NSLog(@"LoadImageFromSDK : Image created = %@", imageTmp);

使用Cocoa的Photoshop插件 - 如何获得预览

1 个答案: