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_n_i_h_t_t_p_image_request_8m_source.html
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_n_i_h_t_t_p_image_request_8m_source.html
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<div class="title">src/networkimage/src/NIHTTPImageRequest.m</div> </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">//</span>
<a name="l00002"></a>00002 <span class="comment">// Copyright 2011 Jeff Verkoeyen</span>
<a name="l00003"></a>00003 <span class="comment">//</span>
<a name="l00004"></a>00004 <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span>
<a name="l00005"></a>00005 <span class="comment">// you may not use this file except in compliance with the License.</span>
<a name="l00006"></a>00006 <span class="comment">// You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment">//</span>
<a name="l00008"></a>00008 <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment">//</span>
<a name="l00010"></a>00010 <span class="comment">// Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span>
<a name="l00012"></a>00012 <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment">// See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment">// limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment">//</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#import "NIHTTPImageRequest.h"</span>
<a name="l00018"></a>00018
<a name="l00019"></a>00019 <span class="preprocessor">#import "NimbusCore.h"</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021
<a name="l00025"></a>00025 <span class="keyword">@implementation </span><a class="code" href="interface_n_i_h_t_t_p_image_request.html" title="A threaded network request for an image that chops up and resizes the image before returning to the U...">NIHTTPImageRequest</a>
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="keyword">@synthesize</span> <a class="code" href="interface_n_i_h_t_t_p_image_request.html#ac7d042c084fe692087bbbe6359642780" title="x/y, width/height are in percent coordinates.">imageCropRect</a> = _imageCropRect;
<a name="l00028"></a>00028 <span class="keyword">@synthesize</span> <a class="code" href="interface_n_i_h_t_t_p_image_request.html#a98b6b9986e30decafe821755bdae5f3f" title="The size of the image to be displayed on the screen.">imageDisplaySize</a> = _imageDisplaySize;
<a name="l00029"></a>00029 <span class="keyword">@synthesize</span> <a class="code" href="interface_n_i_h_t_t_p_image_request.html#aee0571051fc0f4e1952ec0a3f4bfe8de" title="Options for modifying the way images are cropped when scaling.">scaleOptions</a> = _scaleOptions;
<a name="l00030"></a>00030 <span class="keyword">@synthesize</span> <a class="code" href="interface_n_i_h_t_t_p_image_request.html#abba79b08eabfdd05d8d30a40cd272829" title="The interpolation quality to use when resizing the image.">interpolationQuality</a> = _interpolationQuality;
<a name="l00031"></a>00031 <span class="keyword">@synthesize</span> <a class="code" href="interface_n_i_h_t_t_p_image_request.html#a85f304984ea0cc6640396dc0d7f0517d" title="Determines how to resize and crop the image.">imageContentMode</a> = _imageContentMode;
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keyword">@synthesize</span> <a class="code" href="interface_n_i_h_t_t_p_image_request.html#a68c2a89f112c47d56c54715596d89d85" title="Upon completion of the request, this is the chopped and sized result image that should be used for di...">imageCroppedAndSizedForDisplay</a> = _imageCroppedAndSizedForDisplay;
<a name="l00034"></a>00034
<a name="l00035"></a>00035
<a name="l00037"></a>00037 - (void)dealloc {
<a name="l00038"></a>00038 <a class="code" href="group___preprocessor-_macros.html#ga5d2e99251aeb3ddb687e27f72336e5db" title="Release and assign nil to an object.">NI_RELEASE_SAFELY</a>(_imageCroppedAndSizedForDisplay);
<a name="l00039"></a>00039
<a name="l00040"></a>00040 [<span class="keyword">super</span> dealloc];
<a name="l00041"></a>00041 }
<a name="l00042"></a>00042
<a name="l00043"></a>00043
<a name="l00045"></a>00045 - (id)initWithURL:(NSURL *)newURL {
<a name="l00046"></a>00046 <span class="keywordflow">if</span> ((<span class="keyword">self</span> = [super initWithURL:newURL])) {
<a name="l00047"></a>00047 <span class="keyword">self</span>.imageCropRect = CGRectZero;
<a name="l00048"></a>00048 <span class="keyword">self</span>.imageDisplaySize = CGSizeZero;
<a name="l00049"></a>00049 <span class="keyword">self</span>.interpolationQuality = kCGInterpolationDefault;
<a name="l00050"></a>00050 <span class="keyword">self</span>.scaleOptions = NINetworkImageViewScaleToFitLeavesExcessAndScaleToFillCropsExcess;
<a name="l00051"></a>00051 <span class="keyword">self</span>.imageContentMode = UIViewContentModeScaleToFill;
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="comment">// Store the image permanently, by default.</span>
<a name="l00054"></a>00054 <span class="keyword">self</span>.cacheStoragePolicy = ASICachePermanentlyCacheStoragePolicy;
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058
<a name="l00059"></a>00059
<a name="l00061"></a>00061 - (id)copyWithZone:(NSZone *)zone {
<a name="l00062"></a>00062 <a class="code" href="interface_n_i_h_t_t_p_image_request.html" title="A threaded network request for an image that chops up and resizes the image before returning to the U...">NIHTTPImageRequest</a>* copy = [<span class="keyword">super</span> copyWithZone:zone];
<a name="l00063"></a>00063
<a name="l00064"></a>00064 [copy setImageCropRect:[<span class="keyword">self</span> imageCropRect]];
<a name="l00065"></a>00065 [copy setImageDisplaySize:[<span class="keyword">self</span> imageDisplaySize]];
<a name="l00066"></a>00066 [copy setScaleOptions:[<span class="keyword">self</span> scaleOptions]];
<a name="l00067"></a>00067 [copy setInterpolationQuality:[<span class="keyword">self</span> interpolationQuality]];
<a name="l00068"></a>00068 [copy setImageContentMode:[<span class="keyword">self</span> imageContentMode]];
<a name="l00069"></a>00069 [copy setImageCroppedAndSizedForDisplay:[<span class="keyword">self</span> imageCroppedAndSizedForDisplay]];
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keywordflow">return</span> copy;
<a name="l00072"></a>00072 }
<a name="l00073"></a>00073
<a name="l00074"></a>00074
<a name="l00076"></a>00076 - (void)main {
<a name="l00077"></a>00077 <span class="keywordflow">if</span> ([<span class="keyword">self</span>.url isFileURL]) {
<a name="l00078"></a>00078 <span class="comment">// Special case: load the image from disk without hitting the network.</span>
<a name="l00079"></a>00079
<a name="l00080"></a>00080 <span class="comment">// Most of the following code is borrowed from ASIHTTPRequest to get the bare minimum</span>
<a name="l00081"></a>00081 <span class="comment">// functionality working such that the delegates are properly notified.</span>
<a name="l00082"></a>00082 [<span class="keyword">self</span> performSelectorOnMainThread: @selector(requestStarted)
<a name="l00083"></a>00083 withObject: nil
<a name="l00084"></a>00084 waitUntilDone: [NSThread isMainThread]];
<a name="l00085"></a>00085
<a name="l00086"></a>00086 NSError* dataReadError = nil;
<a name="l00087"></a>00087
<a name="l00088"></a>00088 <span class="comment">// The meat of the load-from-disk operation.</span>
<a name="l00089"></a>00089 <a class="code" href="class_n_s_string.html" title="For manipulating NSStrings.">NSString</a>* filePath = [<span class="keyword">self</span>.url path];
<a name="l00090"></a>00090 NSMutableData* data = [NSMutableData dataWithContentsOfFile: filePath
<a name="l00091"></a>00091 options: 0
<a name="l00092"></a>00092 error: &dataReadError];
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="keywordflow">if</span> (nil != dataReadError) {
<a name="l00095"></a>00095 <span class="comment">// This generally happens when the file path points to a file that doesn't exist.</span>
<a name="l00096"></a>00096 <span class="comment">// dataReadError has the complete details.</span>
<a name="l00097"></a>00097 [<span class="keyword">self</span> failWithError:dataReadError];
<a name="l00098"></a>00098
<a name="l00099"></a>00099 } <span class="keywordflow">else</span> {
<a name="l00100"></a>00100 [<span class="keyword">self</span> setRawResponseData:data];
<a name="l00101"></a>00101
<a name="l00102"></a>00102 <span class="comment">// Notifies the delegates of the request completion.</span>
<a name="l00103"></a>00103 [<span class="keyword">self</span> requestFinished];
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 [<span class="keyword">self</span> markAsFinished];
<a name="l00107"></a>00107
<a name="l00108"></a>00108 } <span class="keywordflow">else</span> {
<a name="l00109"></a>00109 <span class="comment">// If we're not loading an image from disk then just let ASI handle the network magic</span>
<a name="l00110"></a>00110 <span class="comment">// for us.</span>
<a name="l00111"></a>00111 [<span class="keyword">super</span> main];
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113 }
<a name="l00114"></a>00114
<a name="l00115"></a>00115
<a name="l00117"></a>00117 - (void)requestFinished {
<a name="l00118"></a>00118 <a class="code" href="class_n_s_data.html" title="For hashing raw data.">NSData</a>* responseData = [<span class="keyword">self</span> responseData];
<a name="l00119"></a>00119 UIImage* image = [[UIImage alloc] initWithData:responseData];
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="comment">// Clear out the data as quickly as we can. We never use the response data in the</span>
<a name="l00122"></a>00122 <span class="comment">// NINetworkImageView object, so this avoids doubling our memory on every thread.</span>
<a name="l00123"></a>00123 [<span class="keyword">self</span> setRawResponseData:nil];
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="comment">// Slice it, dice it!</span>
<a name="l00126"></a>00126 [<span class="keyword">self</span> setImageCroppedAndSizedForDisplay:[[<span class="keyword">self</span> class] imageFromSource: image
<a name="l00127"></a>00127 withContentMode: self.imageContentMode
<a name="l00128"></a>00128 cropRect: self.imageCropRect
<a name="l00129"></a>00129 displaySize: self.imageDisplaySize
<a name="l00130"></a>00130 scaleOptions: self.scaleOptions
<a name="l00131"></a>00131 interpolationQuality: self.interpolationQuality]];
<a name="l00132"></a>00132
<a name="l00133"></a>00133 <a class="code" href="group___preprocessor-_macros.html#ga5d2e99251aeb3ddb687e27f72336e5db" title="Release and assign nil to an object.">NI_RELEASE_SAFELY</a>(image);
<a name="l00134"></a>00134
<a name="l00135"></a>00135 [<span class="keyword">super</span> requestFinished];
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="keyword">@end</span>
<a name="l00140"></a>00140
<a name="l00141"></a>00141
<a name="l00145"></a>00145 <span class="keyword">@implementation </span><a class="code" href="interface_n_i_h_t_t_p_image_request.html" title="A threaded network request for an image that chops up and resizes the image before returning to the U...">NIHTTPImageRequest</a> (ImageModifications)
<a name="l00146"></a>00146
<a name="l00147"></a>00147
<a name="l00149"></a>00149
<a name="l00153"></a>00153 + (CGRect)sourceRectWithImageSize:(CGSize)imageSize
<a name="l00154"></a>00154 displaySize:(CGSize)displaySize
<a name="l00155"></a>00155 contentMode:(UIViewContentMode)contentMode {
<a name="l00156"></a>00156 <span class="keywordflow">if</span> (UIViewContentModeScaleToFill == contentMode) {
<a name="l00157"></a>00157 <span class="comment">// Scale to fill draws the original image by squashing it to fit the destination's</span>
<a name="l00158"></a>00158 <span class="comment">// aspect ratio, so the source and destination rects aren't modified.</span>
<a name="l00159"></a>00159 <span class="keywordflow">return</span> CGRectMake(0, 0, imageSize.width, imageSize.height);
<a name="l00160"></a>00160
<a name="l00161"></a>00161 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeScaleAspectFit == contentMode) {
<a name="l00162"></a>00162 <span class="comment">// Aspect fit grabs the entire original image and squashes it down to a frame that fits</span>
<a name="l00163"></a>00163 <span class="comment">// the destination and leaves the unfilled space transparent.</span>
<a name="l00164"></a>00164 <span class="keywordflow">return</span> CGRectMake(0, 0, imageSize.width, imageSize.height);
<a name="l00165"></a>00165
<a name="l00166"></a>00166 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeScaleAspectFill == contentMode) {
<a name="l00167"></a>00167 <span class="comment">// Aspect fill requires that we take the destination rectangle and "fit" it within the</span>
<a name="l00168"></a>00168 <span class="comment">// source rectangle; this gives us the area of the source image we'll crop out to draw into</span>
<a name="l00169"></a>00169 <span class="comment">// the destination image.</span>
<a name="l00170"></a>00170 CGFloat scale = MIN(imageSize.width / displaySize.width,
<a name="l00171"></a>00171 imageSize.height / displaySize.height);
<a name="l00172"></a>00172 CGSize scaledDisplaySize = CGSizeMake(displaySize.width * scale, displaySize.height * scale);
<a name="l00173"></a>00173 <span class="keywordflow">return</span> CGRectMake(floorf((imageSize.width - scaledDisplaySize.width) / 2),
<a name="l00174"></a>00174 floorf((imageSize.height - scaledDisplaySize.height) / 2),
<a name="l00175"></a>00175 scaledDisplaySize.width,
<a name="l00176"></a>00176 scaledDisplaySize.height);
<a name="l00177"></a>00177
<a name="l00178"></a>00178 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeCenter == contentMode) {
<a name="l00179"></a>00179 <span class="comment">// We need to cut out a hole the size of the display in the center of the source image.</span>
<a name="l00180"></a>00180 <span class="keywordflow">return</span> CGRectMake(floorf((imageSize.width - displaySize.width) / 2),
<a name="l00181"></a>00181 floorf((imageSize.width - displaySize.width) / 2),
<a name="l00182"></a>00182 displaySize.width, displaySize.height);
<a name="l00183"></a>00183
<a name="l00184"></a>00184 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeTop == contentMode) {
<a name="l00185"></a>00185 <span class="comment">// We need to cut out a hole the size of the display in the top center of the source image.</span>
<a name="l00186"></a>00186 <span class="keywordflow">return</span> CGRectMake(floorf((imageSize.width - displaySize.width) / 2),
<a name="l00187"></a>00187 0,
<a name="l00188"></a>00188 displaySize.width, displaySize.height);
<a name="l00189"></a>00189
<a name="l00190"></a>00190 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeBottom == contentMode) {
<a name="l00191"></a>00191 <span class="comment">// We need to cut out a hole the size of the display in the bottom center of the source image.</span>
<a name="l00192"></a>00192 <span class="keywordflow">return</span> CGRectMake(floorf((imageSize.width - displaySize.width) / 2),
<a name="l00193"></a>00193 imageSize.height - displaySize.height,
<a name="l00194"></a>00194 displaySize.width, displaySize.height);
<a name="l00195"></a>00195
<a name="l00196"></a>00196 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeLeft == contentMode) {
<a name="l00197"></a>00197 <span class="comment">// We need to cut out a hole the size of the display in the left center of the source image.</span>
<a name="l00198"></a>00198 <span class="keywordflow">return</span> CGRectMake(0,
<a name="l00199"></a>00199 floorf((imageSize.width - displaySize.width) / 2),
<a name="l00200"></a>00200 displaySize.width, displaySize.height);
<a name="l00201"></a>00201
<a name="l00202"></a>00202 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeRight == contentMode) {
<a name="l00203"></a>00203 <span class="comment">// We need to cut out a hole the size of the display in the right center of the source image.</span>
<a name="l00204"></a>00204 <span class="keywordflow">return</span> CGRectMake(imageSize.width - displaySize.width,
<a name="l00205"></a>00205 floorf((imageSize.width - displaySize.width) / 2),
<a name="l00206"></a>00206 displaySize.width, displaySize.height);
<a name="l00207"></a>00207
<a name="l00208"></a>00208 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeTopLeft == contentMode) {
<a name="l00209"></a>00209 <span class="comment">// We need to cut out a hole the size of the display in the top left of the source image.</span>
<a name="l00210"></a>00210 <span class="keywordflow">return</span> CGRectMake(0,
<a name="l00211"></a>00211 0,
<a name="l00212"></a>00212 displaySize.width, displaySize.height);
<a name="l00213"></a>00213
<a name="l00214"></a>00214 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeTopRight == contentMode) {
<a name="l00215"></a>00215 <span class="comment">// We need to cut out a hole the size of the display in the top right of the source image.</span>
<a name="l00216"></a>00216 <span class="keywordflow">return</span> CGRectMake(imageSize.width - displaySize.width,
<a name="l00217"></a>00217 0,
<a name="l00218"></a>00218 displaySize.width, displaySize.height);
<a name="l00219"></a>00219
<a name="l00220"></a>00220 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeBottomLeft == contentMode) {
<a name="l00221"></a>00221 <span class="comment">// We need to cut out a hole the size of the display in the bottom left of the source image.</span>
<a name="l00222"></a>00222 <span class="keywordflow">return</span> CGRectMake(0,
<a name="l00223"></a>00223 imageSize.height - displaySize.height,
<a name="l00224"></a>00224 displaySize.width, displaySize.height);
<a name="l00225"></a>00225
<a name="l00226"></a>00226 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeBottomRight == contentMode) {
<a name="l00227"></a>00227 <span class="comment">// We need to cut out a hole the size of the display in the bottom right of the source image.</span>
<a name="l00228"></a>00228 <span class="keywordflow">return</span> CGRectMake(imageSize.width - displaySize.width,
<a name="l00229"></a>00229 imageSize.height - displaySize.height,
<a name="l00230"></a>00230 displaySize.width, displaySize.height);
<a name="l00231"></a>00231
<a name="l00232"></a>00232 } <span class="keywordflow">else</span> {
<a name="l00233"></a>00233 <span class="comment">// Not implemented</span>
<a name="l00234"></a>00234 <a class="code" href="group___debugging-_tools.html#gab5d8a773517976d97335706474ae1317" title="Only writes to the log if NIMaxLogLevel >= NILOGLEVEL_ERROR.">NIDERROR</a>(<span class="stringliteral">@"This content mode has not been implemented in the threaded network image view: %d"</span>,
<a name="l00235"></a>00235 contentMode);
<a name="l00236"></a>00236 <span class="keywordflow">return</span> CGRectMake(0, 0, imageSize.width, imageSize.height);
<a name="l00237"></a>00237 }
<a name="l00238"></a>00238 }
<a name="l00239"></a>00239
<a name="l00240"></a>00240
<a name="l00242"></a>00242
<a name="l00246"></a>00246 + (CGRect)destinationRectWithImageSize:(CGSize)imageSize
<a name="l00247"></a>00247 displaySize:(CGSize)displaySize
<a name="l00248"></a>00248 contentMode:(UIViewContentMode)contentMode {
<a name="l00249"></a>00249 <span class="keywordflow">if</span> (UIViewContentModeScaleAspectFit == contentMode) {
<a name="l00250"></a>00250 <span class="comment">// Fit the image right in the center of the source frame and maintain the aspect ratio.</span>
<a name="l00251"></a>00251 CGFloat scale = MIN(displaySize.width / imageSize.width,
<a name="l00252"></a>00252 displaySize.height / imageSize.height);
<a name="l00253"></a>00253 CGSize scaledImageSize = CGSizeMake(imageSize.width * scale, imageSize.height * scale);
<a name="l00254"></a>00254 <span class="keywordflow">return</span> CGRectMake(floorf((displaySize.width - scaledImageSize.width) / 2),
<a name="l00255"></a>00255 floorf((displaySize.height - scaledImageSize.height) / 2),
<a name="l00256"></a>00256 scaledImageSize.width,
<a name="l00257"></a>00257 scaledImageSize.height);
<a name="l00258"></a>00258
<a name="l00259"></a>00259 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (UIViewContentModeScaleToFill == contentMode
<a name="l00260"></a>00260 || UIViewContentModeScaleAspectFill == contentMode
<a name="l00261"></a>00261 || UIViewContentModeCenter == contentMode
<a name="l00262"></a>00262 || UIViewContentModeTop == contentMode
<a name="l00263"></a>00263 || UIViewContentModeBottom == contentMode
<a name="l00264"></a>00264 || UIViewContentModeLeft == contentMode
<a name="l00265"></a>00265 || UIViewContentModeRight == contentMode
<a name="l00266"></a>00266 || UIViewContentModeTopLeft == contentMode
<a name="l00267"></a>00267 || UIViewContentModeTopRight == contentMode
<a name="l00268"></a>00268 || UIViewContentModeBottomLeft == contentMode
<a name="l00269"></a>00269 || UIViewContentModeBottomRight == contentMode) {
<a name="l00270"></a>00270 <span class="comment">// We're filling the entire destination, so the destination rect is the display rect.</span>
<a name="l00271"></a>00271 <span class="keywordflow">return</span> CGRectMake(0, 0, displaySize.width, displaySize.height);
<a name="l00272"></a>00272
<a name="l00273"></a>00273 } <span class="keywordflow">else</span> {
<a name="l00274"></a>00274 <span class="comment">// Not implemented</span>
<a name="l00275"></a>00275 <a class="code" href="group___debugging-_tools.html#gab5d8a773517976d97335706474ae1317" title="Only writes to the log if NIMaxLogLevel >= NILOGLEVEL_ERROR.">NIDERROR</a>(<span class="stringliteral">@"This content mode has not been implemented in the threaded network image view: %d"</span>,
<a name="l00276"></a>00276 contentMode);
<a name="l00277"></a>00277 <span class="keywordflow">return</span> CGRectMake(0, 0, displaySize.width, displaySize.height);
<a name="l00278"></a>00278 }
<a name="l00279"></a>00279 }
<a name="l00280"></a>00280
<a name="l00281"></a>00281
<a name="l00283"></a>00283 + (UIImage *)imageFromSource: (UIImage *)src
<a name="l00284"></a>00284 withContentMode: (UIViewContentMode)contentMode
<a name="l00285"></a>00285 cropRect: (CGRect)cropRect
<a name="l00286"></a>00286 displaySize: (CGSize)displaySize
<a name="l00287"></a>00287 scaleOptions: (<a class="code" href="group___network-_image-_user-_interface.html#ga44d338b3b1eae1d2a3bb8fd985acf856" title="Flags for modifying the way cropping is handled when scaling images to fit or fill.">NINetworkImageViewScaleOptions</a>)scaleOptions
<a name="l00288"></a>00288 interpolationQuality: (CGInterpolationQuality)interpolationQuality {
<a name="l00289"></a>00289
<a name="l00290"></a>00290 UIImage* resultImage = src;
<a name="l00291"></a>00291
<a name="l00292"></a>00292 CGImageRef srcImageRef = src.CGImage;
<a name="l00293"></a>00293 CGImageRef croppedImageRef = nil;
<a name="l00294"></a>00294 CGImageRef trimmedImageRef = nil;
<a name="l00295"></a>00295
<a name="l00296"></a>00296 CGRect srcRect = CGRectMake(0, 0, src.size.width, src.size.height);
<a name="l00297"></a>00297
<a name="l00298"></a>00298 <span class="comment">// Cropping</span>
<a name="l00299"></a>00299 <span class="keywordflow">if</span> (!CGRectIsEmpty(cropRect)
<a name="l00300"></a>00300 && !CGRectEqualToRect(cropRect, CGRectMake(0, 0, 1, 1))) {
<a name="l00301"></a>00301 CGRect innerRect = CGRectMake(floorf(src.size.width * cropRect.origin.x),
<a name="l00302"></a>00302 floorf(src.size.height * cropRect.origin.y),
<a name="l00303"></a>00303 floorf(src.size.width * cropRect.size.width),
<a name="l00304"></a>00304 floorf(src.size.height * cropRect.size.height));
<a name="l00305"></a>00305
<a name="l00306"></a>00306 <span class="comment">// Create a new image containing only the cropped inner rect.</span>
<a name="l00307"></a>00307 srcImageRef = CGImageCreateWithImageInRect(srcImageRef, innerRect);
<a name="l00308"></a>00308 croppedImageRef = srcImageRef;
<a name="l00309"></a>00309
<a name="l00310"></a>00310 <span class="comment">// This new image will likely have a different width and height, so we have to update</span>
<a name="l00311"></a>00311 <span class="comment">// the source rect as a result.</span>
<a name="l00312"></a>00312 srcRect = CGRectMake(0, 0,
<a name="l00313"></a>00313 CGRectGetWidth(innerRect),
<a name="l00314"></a>00314 CGRectGetHeight(innerRect));
<a name="l00315"></a>00315 }
<a name="l00316"></a>00316
<a name="l00317"></a>00317 <span class="comment">// Display</span>
<a name="l00318"></a>00318 <span class="keywordflow">if</span> (0 < displaySize.width
<a name="l00319"></a>00319 && 0 < displaySize.height) {
<a name="l00320"></a>00320
<a name="l00321"></a>00321 <span class="keywordflow">if</span> ((NINetworkImageViewScaleToFillLeavesExcess
<a name="l00322"></a>00322 == (NINetworkImageViewScaleToFillLeavesExcess & scaleOptions))
<a name="l00323"></a>00323 && UIViewContentModeScaleAspectFill == contentMode) {
<a name="l00324"></a>00324 <span class="comment">// Make the display size match the aspect ratio of the source image by growing the</span>
<a name="l00325"></a>00325 <span class="comment">// display size.</span>
<a name="l00326"></a>00326 CGFloat imageAspectRatio = srcRect.size.width / srcRect.size.height;
<a name="l00327"></a>00327 CGFloat displayAspectRatio = displaySize.width / displaySize.height;
<a name="l00328"></a>00328
<a name="l00329"></a>00329 <span class="keywordflow">if</span> (imageAspectRatio > displayAspectRatio) {
<a name="l00330"></a>00330 <span class="comment">// The image is wider than the display, so let's increase the width.</span>
<a name="l00331"></a>00331 displaySize.width = displaySize.height * imageAspectRatio;
<a name="l00332"></a>00332
<a name="l00333"></a>00333 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (imageAspectRatio < displayAspectRatio) {
<a name="l00334"></a>00334 <span class="comment">// The image is taller than the display, so let's increase the height.</span>
<a name="l00335"></a>00335 displaySize.height = displaySize.width * (srcRect.size.height / srcRect.size.width);
<a name="l00336"></a>00336 }
<a name="l00337"></a>00337
<a name="l00338"></a>00338 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((NINetworkImageViewScaleToFitCropsExcess
<a name="l00339"></a>00339 == (NINetworkImageViewScaleToFitCropsExcess & scaleOptions))
<a name="l00340"></a>00340 && UIViewContentModeScaleAspectFit == contentMode) {
<a name="l00341"></a>00341 <span class="comment">// Make the display size match the aspect ratio of the source image by shrinking the</span>
<a name="l00342"></a>00342 <span class="comment">// display size.</span>
<a name="l00343"></a>00343 CGFloat imageAspectRatio = srcRect.size.width / srcRect.size.height;
<a name="l00344"></a>00344 CGFloat displayAspectRatio = displaySize.width / displaySize.height;
<a name="l00345"></a>00345
<a name="l00346"></a>00346 <span class="keywordflow">if</span> (imageAspectRatio > displayAspectRatio) {
<a name="l00347"></a>00347 <span class="comment">// The image is wider than the display, so let's decrease the height.</span>
<a name="l00348"></a>00348 displaySize.height = displaySize.width * (srcRect.size.height / srcRect.size.width);
<a name="l00349"></a>00349
<a name="l00350"></a>00350 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (imageAspectRatio < displayAspectRatio) {
<a name="l00351"></a>00351 <span class="comment">// The image is taller than the display, so let's decrease the width.</span>
<a name="l00352"></a>00352 displaySize.width = displaySize.height * imageAspectRatio;
<a name="l00353"></a>00353 }
<a name="l00354"></a>00354 }
<a name="l00355"></a>00355
<a name="l00356"></a>00356 CGRect srcCropRect = [<span class="keyword">self</span> sourceRectWithImageSize: srcRect.size
<a name="l00357"></a>00357 displaySize: displaySize
<a name="l00358"></a>00358 contentMode: contentMode];
<a name="l00359"></a>00359 srcCropRect = CGRectMake(floorf(srcCropRect.origin.x),
<a name="l00360"></a>00360 floorf(srcCropRect.origin.y),
<a name="l00361"></a>00361 roundf(srcCropRect.size.width),
<a name="l00362"></a>00362 roundf(srcCropRect.size.height));
<a name="l00363"></a>00363
<a name="l00364"></a>00364 <span class="comment">// Do we need to crop the source?</span>
<a name="l00365"></a>00365 <span class="keywordflow">if</span> (!CGRectEqualToRect(srcCropRect, srcRect)) {
<a name="l00366"></a>00366 srcImageRef = CGImageCreateWithImageInRect(srcImageRef, srcCropRect);
<a name="l00367"></a>00367 trimmedImageRef = srcImageRef;
<a name="l00368"></a>00368
<a name="l00369"></a>00369 srcRect = CGRectMake(0, 0,
<a name="l00370"></a>00370 CGRectGetWidth(srcCropRect),
<a name="l00371"></a>00371 CGRectGetHeight(srcCropRect));
<a name="l00372"></a>00372
<a name="l00373"></a>00373 <span class="comment">// Release the cropped image source to reduce this thread's memory consumption.</span>
<a name="l00374"></a>00374 <span class="keywordflow">if</span> (nil != croppedImageRef) {
<a name="l00375"></a>00375 CGImageRelease(croppedImageRef);
<a name="l00376"></a>00376 croppedImageRef = nil;
<a name="l00377"></a>00377 }
<a name="l00378"></a>00378 }
<a name="l00379"></a>00379
<a name="l00380"></a>00380 <span class="comment">// Calcuate the destination frame.</span>
<a name="l00381"></a>00381 CGRect dstBlitRect = [<span class="keyword">self</span> destinationRectWithImageSize: srcRect.size
<a name="l00382"></a>00382 displaySize: displaySize
<a name="l00383"></a>00383 contentMode: contentMode];
<a name="l00384"></a>00384 dstBlitRect = CGRectMake(floorf(dstBlitRect.origin.x),
<a name="l00385"></a>00385 floorf(dstBlitRect.origin.y),
<a name="l00386"></a>00386 roundf(dstBlitRect.size.width),
<a name="l00387"></a>00387 roundf(dstBlitRect.size.height));
<a name="l00388"></a>00388
<a name="l00389"></a>00389 <span class="comment">// Round any remainder on the display size dimensions.</span>
<a name="l00390"></a>00390 displaySize = CGSizeMake(roundf(displaySize.width), roundf(displaySize.height));
<a name="l00391"></a>00391
<a name="l00392"></a>00392 <span class="comment">// See table "Supported Pixel Formats" in the following guide for support iOS bitmap formats:</span>
<a name="l00393"></a>00393 <span class="comment">// http://developer.apple.com/library/mac/#documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_context/dq_context.html</span>
<a name="l00394"></a>00394 CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
<a name="l00395"></a>00395 CGBitmapInfo bmi = kCGImageAlphaPremultipliedLast;
<a name="l00396"></a>00396
<a name="l00397"></a>00397 <span class="comment">// For screen sizes with higher resolutions, we create a larger image with a scale value</span>
<a name="l00398"></a>00398 <span class="comment">// so that it appears crisper on the screen.</span>
<a name="l00399"></a>00399 CGFloat screenScale = <a class="code" href="group___s_d_k-_availability.html#ga8ffc9070109f21db5092d5e2b65b7578" title="Fetch the screen's scale in an SDK-agnostic way.">NIScreenScale</a>();
<a name="l00400"></a>00400
<a name="l00401"></a>00401 <span class="comment">// Create our final composite image.</span>
<a name="l00402"></a>00402 CGContextRef dstBmp = CGBitmapContextCreate(NULL,
<a name="l00403"></a>00403 displaySize.width * screenScale,
<a name="l00404"></a>00404 displaySize.height * screenScale,
<a name="l00405"></a>00405 8,
<a name="l00406"></a>00406 0,
<a name="l00407"></a>00407 colorSpace,
<a name="l00408"></a>00408 bmi);
<a name="l00409"></a>00409
<a name="l00410"></a>00410 <span class="comment">// If this fails then we're likely creating an invalid bitmap and shit's about to go down.</span>
<a name="l00411"></a>00411 <span class="comment">// In production this will fail somewhat gracefully, in that we'll end up just using the</span>
<a name="l00412"></a>00412 <span class="comment">// source image instead of the cropped and resized image.</span>
<a name="l00413"></a>00413 <a class="code" href="group___debugging-_tools.html#ga13cc3ae82820ea8141bc319bcb76ab7f" title="Assertions that only fire when DEBUG is defined.">NIDASSERT</a>(nil != dstBmp);
<a name="l00414"></a>00414
<a name="l00415"></a>00415 <span class="keywordflow">if</span> (nil != dstBmp) {
<a name="l00416"></a>00416 CGRect dstRect = CGRectMake(0, 0,
<a name="l00417"></a>00417 displaySize.width * screenScale,
<a name="l00418"></a>00418 displaySize.height * screenScale);
<a name="l00419"></a>00419
<a name="l00420"></a>00420 <span class="comment">// Render the source image into the destination image.</span>
<a name="l00421"></a>00421 CGContextClearRect(dstBmp, dstRect);
<a name="l00422"></a>00422 CGContextSetInterpolationQuality(dstBmp, interpolationQuality);
<a name="l00423"></a>00423
<a name="l00424"></a>00424 CGRect scaledBlitRect = CGRectMake(dstBlitRect.origin.x * screenScale,
<a name="l00425"></a>00425 dstBlitRect.origin.y * screenScale,
<a name="l00426"></a>00426 dstBlitRect.size.width * screenScale,
<a name="l00427"></a>00427 dstBlitRect.size.height * screenScale);
<a name="l00428"></a>00428 CGContextDrawImage(dstBmp, scaledBlitRect, srcImageRef);
<a name="l00429"></a>00429
<a name="l00430"></a>00430 CGImageRef resultImageRef = CGBitmapContextCreateImage(dstBmp);
<a name="l00431"></a>00431
<a name="l00432"></a>00432 <span class="keywordflow">if</span> (nil != resultImageRef) {
<a name="l00433"></a>00433 <span class="keywordflow">if</span> ([[UIImage <span class="keyword">class</span>] respondsToSelector:<span class="keyword">@selector</span>(imageWithCGImage:scale:orientation:)]) {
<a name="l00434"></a>00434 resultImage = [UIImage imageWithCGImage: resultImageRef
<a name="l00435"></a>00435 scale: screenScale
<a name="l00436"></a>00436 orientation: UIImageOrientationUp];
<a name="l00437"></a>00437
<a name="l00438"></a>00438 } <span class="keywordflow">else</span> {
<a name="l00439"></a>00439 resultImage = [UIImage imageWithCGImage: resultImageRef];
<a name="l00440"></a>00440 }
<a name="l00441"></a>00441 CGImageRelease(resultImageRef);
<a name="l00442"></a>00442 }
<a name="l00443"></a>00443
<a name="l00444"></a>00444 CGContextRelease(dstBmp);
<a name="l00445"></a>00445 }
<a name="l00446"></a>00446
<a name="l00447"></a>00447 CGColorSpaceRelease(colorSpace);
<a name="l00448"></a>00448
<a name="l00449"></a>00449 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (nil != croppedImageRef) {
<a name="l00450"></a>00450 resultImage = [UIImage imageWithCGImage:srcImageRef];
<a name="l00451"></a>00451 }
<a name="l00452"></a>00452
<a name="l00453"></a>00453 <span class="comment">// Memory cleanup.</span>
<a name="l00454"></a>00454 <span class="keywordflow">if</span> (nil != trimmedImageRef) {
<a name="l00455"></a>00455 CGImageRelease(trimmedImageRef);
<a name="l00456"></a>00456 }
<a name="l00457"></a>00457 <span class="keywordflow">if</span> (nil != croppedImageRef) {
<a name="l00458"></a>00458 CGImageRelease(croppedImageRef);
<a name="l00459"></a>00459 }
<a name="l00460"></a>00460
<a name="l00461"></a>00461 <span class="keywordflow">return</span> resultImage;
<a name="l00462"></a>00462 }
<a name="l00463"></a>00463
<a name="l00464"></a>00464
<a name="l00465"></a>00465 <span class="keyword">@end</span>
</pre></div></div>
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