148 lines
4.6 KiB
Objective-C
148 lines
4.6 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTImageUtils.h"
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#import "RCTLog.h"
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CGSize RCTTargetSizeForClipRect(CGRect clipRect)
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{
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return (CGSize){
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clipRect.size.width + clipRect.origin.x * 2,
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clipRect.size.height + clipRect.origin.y * 2
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};
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}
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CGRect RCTClipRect(CGSize sourceSize, CGFloat sourceScale,
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CGSize destSize, CGFloat destScale,
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UIViewContentMode resizeMode)
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{
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if (CGSizeEqualToSize(destSize, CGSizeZero)) {
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// Assume we require the largest size available
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return (CGRect){CGPointZero, sourceSize};
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}
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// Precompensate for scale
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CGFloat scale = sourceScale / destScale;
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sourceSize.width *= scale;
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sourceSize.height *= scale;
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// Calculate aspect ratios if needed (don't bother if resizeMode == stretch)
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CGFloat aspect = 0.0, targetAspect = 0.0;
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if (resizeMode != UIViewContentModeScaleToFill) {
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aspect = sourceSize.width / sourceSize.height;
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targetAspect = destSize.width / destSize.height;
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if (aspect == targetAspect) {
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resizeMode = UIViewContentModeScaleToFill;
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}
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}
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switch (resizeMode) {
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case UIViewContentModeScaleToFill: // stretch
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sourceSize.width = MIN(destSize.width, sourceSize.width);
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sourceSize.height = MIN(destSize.height, sourceSize.height);
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return (CGRect){CGPointZero, sourceSize};
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case UIViewContentModeScaleAspectFit: // contain
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if (targetAspect <= aspect) { // target is taller than content
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sourceSize.width = destSize.width = MIN(sourceSize.width, destSize.width);
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sourceSize.height = sourceSize.width / aspect;
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} else { // target is wider than content
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sourceSize.height = destSize.height = MIN(sourceSize.height, destSize.height);
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sourceSize.width = sourceSize.height * aspect;
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}
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return (CGRect){CGPointZero, sourceSize};
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case UIViewContentModeScaleAspectFill: // cover
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if (targetAspect <= aspect) { // target is taller than content
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sourceSize.height = destSize.height = MIN(sourceSize.height, destSize.height);
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sourceSize.width = sourceSize.height * aspect;
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destSize.width = destSize.height * targetAspect;
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return (CGRect){{(destSize.width - sourceSize.width) / 2, 0}, sourceSize};
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} else { // target is wider than content
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sourceSize.width = destSize.width = MIN(sourceSize.width, destSize.width);
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sourceSize.height = sourceSize.width / aspect;
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destSize.height = destSize.width / targetAspect;
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return (CGRect){{0, (destSize.height - sourceSize.height) / 2}, sourceSize};
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}
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default:
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RCTLogError(@"A resizeMode value of %zd is not supported", resizeMode);
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return (CGRect){CGPointZero, destSize};
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}
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}
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RCT_EXTERN BOOL RCTUpscalingRequired(CGSize sourceSize, CGFloat sourceScale,
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CGSize destSize, CGFloat destScale,
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UIViewContentMode resizeMode)
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{
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if (CGSizeEqualToSize(destSize, CGSizeZero)) {
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// Assume we require the largest size available
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return YES;
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}
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// Precompensate for scale
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CGFloat scale = sourceScale / destScale;
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sourceSize.width *= scale;
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sourceSize.height *= scale;
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// Calculate aspect ratios if needed (don't bother if resizeMode == stretch)
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CGFloat aspect = 0.0, targetAspect = 0.0;
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if (resizeMode != UIViewContentModeScaleToFill) {
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aspect = sourceSize.width / sourceSize.height;
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targetAspect = destSize.width / destSize.height;
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if (aspect == targetAspect) {
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resizeMode = UIViewContentModeScaleToFill;
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}
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}
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switch (resizeMode) {
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case UIViewContentModeScaleToFill: // stretch
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return destSize.width > sourceSize.width || destSize.height > sourceSize.height;
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case UIViewContentModeScaleAspectFit: // contain
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if (targetAspect <= aspect) { // target is taller than content
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return destSize.width > sourceSize.width;
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} else { // target is wider than content
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return destSize.height > sourceSize.height;
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}
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case UIViewContentModeScaleAspectFill: // cover
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if (targetAspect <= aspect) { // target is taller than content
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return destSize.height > sourceSize.height;
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} else { // target is wider than content
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return destSize.width > sourceSize.width;
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}
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default:
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RCTLogError(@"A resizeMode value of %zd is not supported", resizeMode);
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return NO;
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}
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}
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