1/* 2 PPDocument_NativeFileIcon.m 3 4 Copyright 2013-2018 Josh Freeman 5 http://www.twilightedge.com 6 7 This file is part of PikoPixel for Mac OS X and GNUstep. 8 PikoPixel is a graphical application for drawing & editing pixel-art images. 9 10 PikoPixel is free software: you can redistribute it and/or modify it under 11 the terms of the GNU Affero General Public License as published by the 12 Free Software Foundation, either version 3 of the License, or (at your 13 option) any later version approved for PikoPixel by its copyright holder (or 14 an authorized proxy). 15 16 PikoPixel is distributed in the hope that it will be useful, but WITHOUT ANY 17 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 18 FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more 19 details. 20 21 You should have received a copy of the GNU Affero General Public License 22 along with this program. If not, see <http://www.gnu.org/licenses/>. 23*/ 24 25#import "PPDocument_NativeFileIcon.h" 26 27#import "PPGeometry.h" 28#import "NSBitmapImageRep_PPUtilities.h" 29#import "NSImage_PPUtilities.h" 30 31 32#define kMinDimensionForFileIcon 256 33 34 35@implementation PPDocument (NativeFileIcon) 36 37- (NSImage *) nativeFileIconImage 38{ 39 float maxCanvasDimension, scalingFactor; 40 NSSize iconSize, scaledImageSize; 41 NSPoint scaledImageOrigin; 42 NSBitmapImageRep *iconBitmap; 43 NSImage *iconImage; 44 45 // File icon image needs to be square (non-square file icons are distorted on 10.7+) 46 // and contain transparency (opaque icons have display issues on 10.4/10.5) 47 48 if (NSIsEmptyRect(_canvasFrame)) 49 { 50 goto ERROR; 51 } 52 53 maxCanvasDimension = MAX(_canvasFrame.size.width, _canvasFrame.size.height); 54 55 if (maxCanvasDimension < kMinDimensionForFileIcon) 56 { 57 scalingFactor = ceilf(((float) kMinDimensionForFileIcon) / maxCanvasDimension); 58 } 59 else 60 { 61 scalingFactor = 1.0f; 62 } 63 64 iconSize = 65 PPGeometry_SizeScaledByFactorAndRoundedToIntegerValues( 66 NSMakeSize(maxCanvasDimension, maxCanvasDimension), 67 scalingFactor); 68 69 scaledImageSize = 70 PPGeometry_SizeScaledByFactorAndRoundedToIntegerValues(_canvasFrame.size, scalingFactor); 71 72 scaledImageOrigin = PPGeometry_OriginPointForCenteringSizeInSize(scaledImageSize, iconSize); 73 74 iconBitmap = [NSBitmapImageRep ppImageBitmapOfSize: iconSize]; 75 76 if (!iconBitmap) 77 goto ERROR; 78 79 [iconBitmap ppScaledCopyFromImageBitmap: _mergedVisibleLayersBitmap 80 inRect: _canvasFrame 81 toPoint: scaledImageOrigin 82 scalingFactor: scalingFactor]; 83 84 if (PPGeometry_RectIsSquare(_canvasFrame) 85 && ![_mergedVisibleLayersBitmap ppImageBitmapHasTransparentPixels]) 86 { 87 // workaround for 10.4/10.5 issue where setting a file's icon to a completely-opaque 88 // image results in a blank icon: if the image is square (leaves no transparent edges 89 // when scaled & centered on the icon) and completely opaque, then force transparency 90 // by decreasing the alpha value of one pixel (top-left corner) 91 92 PPImageBitmapPixel *iconPixel = (PPImageBitmapPixel *) [iconBitmap bitmapData]; 93 94 if (!iconPixel) 95 goto ERROR; 96 97 macroImagePixelComponent_Alpha(iconPixel) = kMaxImagePixelComponentValue - 1; 98 } 99 100 iconImage = [NSImage ppImageWithBitmap: iconBitmap]; 101 102 if (!iconImage) 103 goto ERROR; 104 105 return iconImage; 106 107ERROR: 108 return nil; 109} 110 111@end 112