Merge pull request #38 from SDWebImage/fix_max_file_size_passes

Update the example and test case for the max file size

Author: dreampiggy

Example/SDWebImageWebPCoderExample/ViewController.m

@@ -42,8 +42,10 @@ - (void)viewDidLoad {
             NSLog(@"%@", @"Static WebP load success");
         }
         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
-            NSData *webpData = [image sd_imageDataAsFormat:SDImageFormatWebP];
+            NSUInteger maxFileSize = 4096;
+            NSData *webpData = [SDImageWebPCoder.sharedCoder encodedDataWithImage:image format:SDImageFormatWebP options:@{SDImageCoderEncodeMaxFileSize : @(maxFileSize)}];
             if (webpData) {
+                NSCAssert(webpData.length <= maxFileSize, @"WebP Encoding with max file size limit works");
                 NSLog(@"%@", @"WebP encoding success");
             }
         });

Tests/SDWebImageWebPCoderTests.m

@@ -182,6 +182,20 @@ - (void)test34StaticImageNotCreateCGContext {
     XCTAssert(canvas == NULL);
 }
 
+- (void)test45WebPEncodingMaxFileSize {
+    NSURL *staticWebPURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"TestImageStatic" withExtension:@"webp"];
+    NSData *data = [NSData dataWithContentsOfURL:staticWebPURL];
+    UIImage *image = [UIImage sd_imageWithWebPData:data];
+    NSData *dataWithNoLimit = [SDImageWebPCoder.sharedCoder encodedDataWithImage:image format:SDImageFormatWebP options:nil];
+    XCTAssertNotNil(dataWithNoLimit);
+    NSUInteger maxFileSize = 8192;
+    NSData *dataWithLimit = [SDImageWebPCoder.sharedCoder encodedDataWithImage:image format:SDImageFormatWebP options:@{SDImageCoderEncodeMaxFileSize : @(maxFileSize)}];
+    XCTAssertNotNil(dataWithLimit);
+    XCTAssertGreaterThan(dataWithNoLimit.length, dataWithLimit.length);
+    XCTAssertGreaterThan(dataWithNoLimit.length, maxFileSize);
+    XCTAssertLessThanOrEqual(dataWithLimit.length, maxFileSize);
+}
+
 @end
 
 @implementation SDWebImageWebPCoderTests (Helpers)