Initial commit

2017-08-15 16:59:01 +08:00
commit bdc83e07ef
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+//
+//  UIImage+WebP.m
+//  SDWebImage
+//
+//  Created by Olivier Poitrey on 07/06/13.
+//  Copyright (c) 2013 Dailymotion. All rights reserved.
+//
+
+#ifdef SD_WEBP
+#import "UIImage+WebP.h"
+
+#if !COCOAPODS
+#import "webp/decode.h"
+#else
+#import "webp/decode.h"
+#endif
+
+// Callback for CGDataProviderRelease
+static void FreeImageData(void *info, const void *data, size_t size)
+{
+    free((void *)data);
+}
+
+@implementation UIImage (WebP)
+
+ (UIImage *)sd_imageWithWebPData:(NSData *)data {
+    WebPDecoderConfig config;
+    if (!WebPInitDecoderConfig(&config)) {
+        return nil;
+    }
+
+    if (WebPGetFeatures(data.bytes, data.length, &config.input) != VP8_STATUS_OK) {
+        return nil;
+    }
+
+    config.output.colorspace = config.input.has_alpha ? MODE_rgbA : MODE_RGB;
+    config.options.use_threads = 1;
+
+    // Decode the WebP image data into a RGBA value array.
+    if (WebPDecode(data.bytes, data.length, &config) != VP8_STATUS_OK) {
+        return nil;
+    }
+
+    int width = config.input.width;
+    int height = config.input.height;
+    if (config.options.use_scaling) {
+        width = config.options.scaled_width;
+        height = config.options.scaled_height;
+    }
+
+    // Construct a UIImage from the decoded RGBA value array.
+    CGDataProviderRef provider =
+    CGDataProviderCreateWithData(NULL, config.output.u.RGBA.rgba, config.output.u.RGBA.size, FreeImageData);
+    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
+    CGBitmapInfo bitmapInfo = config.input.has_alpha ? kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast : 0;
+    size_t components = config.input.has_alpha ? 4 : 3;
+    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
+    CGImageRef imageRef = CGImageCreate(width, height, 8, components * 8, components * width, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);
+
+    CGColorSpaceRelease(colorSpaceRef);
+    CGDataProviderRelease(provider);
+
+    UIImage *image = [[UIImage alloc] initWithCGImage:imageRef];
+    CGImageRelease(imageRef);
+
+    return image;
+}
+
+@end
+
+#if !COCOAPODS
+// Functions to resolve some undefined symbols when using WebP and force_load flag
+void WebPInitPremultiplyNEON(void) {}
+void WebPInitUpsamplersNEON(void) {}
+void VP8DspInitNEON(void) {}
+#endif
+
+#endif