1 // |
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2 // UIImageExtra.m |
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3 // HedgewarsMobile |
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4 // |
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5 // Created by Vittorio on 08/04/10. |
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6 // Copyright 2010 __MyCompanyName__. All rights reserved. |
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7 // |
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8 |
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9 #import "UIImageExtra.h" |
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10 |
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11 |
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12 @implementation UIImage (extra) |
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13 |
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14 -(UIImage *)scaleToSize:(CGSize) size { |
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15 // Create a bitmap graphics context |
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16 // This will also set it as the current context |
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17 UIGraphicsBeginImageContext(size); |
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18 |
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19 // Draw the scaled image in the current context |
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20 [self drawInRect:CGRectMake(0, 0, size.width, size.height)]; |
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21 |
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22 // Create a new image from current context |
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23 UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext(); |
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24 |
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25 // Pop the current context from the stack |
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26 UIGraphicsEndImageContext(); |
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27 |
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28 // Return our new scaled image (autoreleased) |
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29 return scaledImage; |
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30 } |
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31 |
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32 -(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint { |
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33 // create a contex of size of the background image |
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34 return [self mergeWith:secondImage atPoint:secondImagePoint atSize:self.size]; |
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35 } |
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36 |
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37 -(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint atSize:(CGSize) resultingSize { |
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38 UIGraphicsBeginImageContext(resultingSize); |
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39 |
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40 // drav the background image |
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41 [self drawAtPoint:CGPointMake(0,0)]; |
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42 |
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43 // draw the image on top of the first image |
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44 [secondImage drawAtPoint:secondImagePoint]; |
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45 |
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46 // create an image from the current contex (not thread safe) |
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47 UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext(); |
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48 |
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49 // free drawing contex |
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50 UIGraphicsEndImageContext(); |
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51 |
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52 // return the resulting autoreleased image |
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53 return resultImage; |
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54 } |
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55 |
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56 -(id) initWithContentsOfFile:(NSString *)path andCutAt:(CGRect) rect { |
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57 // load image from path |
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58 UIImage *image = [[UIImage alloc] initWithContentsOfFile: path]; |
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59 |
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60 if (nil != image) { |
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61 // get its CGImage representation with a give size |
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62 CGImageRef cgImgage = CGImageCreateWithImageInRect([image CGImage], rect); |
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63 |
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64 // clean memory |
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65 [image release]; |
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66 |
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67 // create a UIImage from the CGImage (memory must be allocated already) |
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68 UIImage *sprite = [self initWithCGImage:cgImgage]; |
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69 |
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70 // clean memory |
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71 CGImageRelease(cgImgage); |
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72 |
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73 // return resulting image |
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74 return sprite; |
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75 } else { |
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76 NSLog(@"initWithContentsOfFile: andCutAt: FAILED"); |
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77 return nil; |
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78 } |
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79 } |
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80 |
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81 -(UIImage *)convertToGrayScale { |
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82 // Create image rectangle with current image width/height |
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83 CGRect imageRect = CGRectMake(0, 0, self.size.width, self.size.height); |
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84 |
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85 // Grayscale color space |
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86 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); |
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87 |
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88 // Create bitmap content with current image size and grayscale colorspace |
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89 CGContextRef context = CGBitmapContextCreate(nil, self.size.width, self.size.height, 8, 0, colorSpace, kCGImageAlphaNone); |
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90 |
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91 // Draw image into current context, with specified rectangle |
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92 // using previously defined context (with grayscale colorspace) |
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93 CGContextDrawImage(context, imageRect, [self CGImage]); |
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94 |
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95 // Create bitmap image info from pixel data in current context |
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96 CGImageRef imageRef = CGBitmapContextCreateImage(context); |
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97 |
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98 // Create a new UIImage object |
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99 UIImage *newImage = [UIImage imageWithCGImage:imageRef]; |
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100 |
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101 // Release colorspace, context and bitmap information |
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102 CGColorSpaceRelease(colorSpace); |
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103 CGContextRelease(context); |
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104 CFRelease(imageRef); |
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105 |
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106 // Return the new grayscale image |
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107 return newImage; |
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108 } |
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109 |
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110 // by http://iphonedevelopertips.com/cocoa/how-to-mask-an-image.html turned into a category by koda |
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111 -(UIImage*) maskImageWith:(UIImage *)maskImage { |
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112 CGImageRef maskRef = maskImage.CGImage; |
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113 |
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114 CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef), |
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115 CGImageGetHeight(maskRef), |
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116 CGImageGetBitsPerComponent(maskRef), |
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117 CGImageGetBitsPerPixel(maskRef), |
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118 CGImageGetBytesPerRow(maskRef), |
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119 CGImageGetDataProvider(maskRef), NULL, false); |
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120 |
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121 CGImageRef masked = CGImageCreateWithMask([self CGImage], mask); |
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122 |
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123 CGImageRelease(mask); |
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124 |
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125 UIImage* retImage = [UIImage imageWithCGImage:masked]; |
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126 |
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127 CGImageRelease(masked); |
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128 |
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129 return retImage; |
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130 } |
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131 |
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132 // by http://blog.sallarp.com/iphone-uiimage-round-corners/ turned into a category by koda |
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133 void addRoundedRectToPath(CGContextRef context, CGRect rect, float ovalWidth, float ovalHeight) |
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134 { |
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135 float fw, fh; |
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136 if (ovalWidth == 0 || ovalHeight == 0) { |
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137 CGContextAddRect(context, rect); |
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138 return; |
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139 } |
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140 CGContextSaveGState(context); |
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141 CGContextTranslateCTM (context, CGRectGetMinX(rect), CGRectGetMinY(rect)); |
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142 CGContextScaleCTM (context, ovalWidth, ovalHeight); |
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143 fw = CGRectGetWidth (rect) / ovalWidth; |
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144 fh = CGRectGetHeight (rect) / ovalHeight; |
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145 CGContextMoveToPoint(context, fw, fh/2); |
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146 CGContextAddArcToPoint(context, fw, fh, fw/2, fh, 1); |
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147 CGContextAddArcToPoint(context, 0, fh, 0, fh/2, 1); |
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148 CGContextAddArcToPoint(context, 0, 0, fw/2, 0, 1); |
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149 CGContextAddArcToPoint(context, fw, 0, fw, fh/2, 1); |
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150 CGContextClosePath(context); |
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151 CGContextRestoreGState(context); |
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152 } |
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153 |
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154 -(UIImage *)makeRoundCornersOfSize:(CGSize) sizewh { |
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155 UIImage * newImage = nil; |
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156 |
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157 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; |
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158 |
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159 NSInteger cornerWidth = sizewh.width; |
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160 NSInteger cornerHeight = sizewh.height; |
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161 int w = self.size.width; |
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162 int h = self.size.height; |
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163 |
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164 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); |
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165 CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst); |
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166 |
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167 CGContextBeginPath(context); |
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168 CGRect rect = CGRectMake(0, 0, w, h); |
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169 addRoundedRectToPath(context, rect, cornerWidth, cornerHeight); |
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170 CGContextClosePath(context); |
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171 CGContextClip(context); |
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172 |
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173 CGContextDrawImage(context, CGRectMake(0, 0, w, h), self.CGImage); |
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174 |
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175 CGImageRef imageMasked = CGBitmapContextCreateImage(context); |
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176 CGContextRelease(context); |
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177 CGColorSpaceRelease(colorSpace); |
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178 [self release]; |
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179 |
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180 newImage = [[UIImage imageWithCGImage:imageMasked] retain]; |
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181 CGImageRelease(imageMasked); |
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182 |
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183 [pool release]; |
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184 |
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185 return newImage; |
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186 } |
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187 |
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188 |
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189 @end |
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