389 lines
12 KiB
Mathematica
389 lines
12 KiB
Mathematica
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/**
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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 <tgmath.h>
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#import <ImageIO/ImageIO.h>
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#import <MobileCoreServices/UTCoreTypes.h>
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#import <React/RCTLog.h>
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#import <React/RCTUtils.h>
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static CGFloat RCTCeilValue(CGFloat value, CGFloat scale)
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{
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return ceil(value * scale) / scale;
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}
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static CGFloat RCTFloorValue(CGFloat value, CGFloat scale)
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{
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return floor(value * scale) / scale;
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}
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static CGSize RCTCeilSize(CGSize size, CGFloat scale)
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{
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return (CGSize){
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RCTCeilValue(size.width, scale),
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RCTCeilValue(size.height, scale)
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};
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}
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static CGImagePropertyOrientation CGImagePropertyOrientationFromUIImageOrientation(UIImageOrientation imageOrientation)
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{
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// see https://stackoverflow.com/a/6699649/496389
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switch (imageOrientation) {
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case UIImageOrientationUp: return kCGImagePropertyOrientationUp;
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case UIImageOrientationDown: return kCGImagePropertyOrientationDown;
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case UIImageOrientationLeft: return kCGImagePropertyOrientationLeft;
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case UIImageOrientationRight: return kCGImagePropertyOrientationRight;
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case UIImageOrientationUpMirrored: return kCGImagePropertyOrientationUpMirrored;
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case UIImageOrientationDownMirrored: return kCGImagePropertyOrientationDownMirrored;
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case UIImageOrientationLeftMirrored: return kCGImagePropertyOrientationLeftMirrored;
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case UIImageOrientationRightMirrored: return kCGImagePropertyOrientationRightMirrored;
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default: return kCGImagePropertyOrientationUp;
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}
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}
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CGRect RCTTargetRect(CGSize sourceSize, CGSize destSize,
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CGFloat destScale, RCTResizeMode 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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CGFloat aspect = sourceSize.width / sourceSize.height;
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// If only one dimension in destSize is non-zero (for example, an Image
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// with `flex: 1` whose height is indeterminate), calculate the unknown
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// dimension based on the aspect ratio of sourceSize
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if (destSize.width == 0) {
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destSize.width = destSize.height * aspect;
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}
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if (destSize.height == 0) {
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destSize.height = destSize.width / aspect;
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}
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// Calculate target aspect ratio if needed
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CGFloat targetAspect = 0.0;
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if (resizeMode != RCTResizeModeCenter &&
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resizeMode != RCTResizeModeStretch) {
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targetAspect = destSize.width / destSize.height;
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if (aspect == targetAspect) {
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resizeMode = RCTResizeModeStretch;
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}
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}
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switch (resizeMode) {
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case RCTResizeModeStretch:
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case RCTResizeModeRepeat:
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return (CGRect){CGPointZero, RCTCeilSize(destSize, destScale)};
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case RCTResizeModeContain:
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if (targetAspect <= aspect) { // target is taller than content
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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;
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sourceSize.width = sourceSize.height * aspect;
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}
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return (CGRect){
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{
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RCTFloorValue((destSize.width - sourceSize.width) / 2, destScale),
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RCTFloorValue((destSize.height - sourceSize.height) / 2, destScale),
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},
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RCTCeilSize(sourceSize, destScale)
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};
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case RCTResizeModeCover:
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if (targetAspect <= aspect) { // target is taller than content
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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){
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{RCTFloorValue((destSize.width - sourceSize.width) / 2, destScale), 0},
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RCTCeilSize(sourceSize, destScale)
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};
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} else { // target is wider than content
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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){
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{0, RCTFloorValue((destSize.height - sourceSize.height) / 2, destScale)},
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RCTCeilSize(sourceSize, destScale)
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};
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}
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case RCTResizeModeCenter:
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// Make sure the image is not clipped by the target.
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if (sourceSize.height > destSize.height) {
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sourceSize.width = destSize.width;
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sourceSize.height = sourceSize.width / aspect;
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}
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if (sourceSize.width > destSize.width) {
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sourceSize.height = destSize.height;
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sourceSize.width = sourceSize.height * aspect;
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}
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return (CGRect){
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{
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RCTFloorValue((destSize.width - sourceSize.width) / 2, destScale),
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RCTFloorValue((destSize.height - sourceSize.height) / 2, destScale),
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},
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RCTCeilSize(sourceSize, destScale)
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};
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}
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}
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CGAffineTransform RCTTransformFromTargetRect(CGSize sourceSize, CGRect targetRect)
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{
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CGAffineTransform transform = CGAffineTransformIdentity;
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transform = CGAffineTransformTranslate(transform,
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targetRect.origin.x,
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targetRect.origin.y);
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transform = CGAffineTransformScale(transform,
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targetRect.size.width / sourceSize.width,
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targetRect.size.height / sourceSize.height);
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return transform;
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}
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CGSize RCTTargetSize(CGSize sourceSize, CGFloat sourceScale,
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CGSize destSize, CGFloat destScale,
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RCTResizeMode resizeMode,
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BOOL allowUpscaling)
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{
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switch (resizeMode) {
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case RCTResizeModeCenter:
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return RCTTargetRect(sourceSize, destSize, destScale, resizeMode).size;
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case RCTResizeModeStretch:
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if (!allowUpscaling) {
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CGFloat scale = sourceScale / destScale;
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destSize.width = MIN(sourceSize.width * scale, destSize.width);
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destSize.height = MIN(sourceSize.height * scale, destSize.height);
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}
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return RCTCeilSize(destSize, destScale);
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default: {
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// Get target size
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CGSize size = RCTTargetRect(sourceSize, destSize, destScale, resizeMode).size;
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if (!allowUpscaling) {
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// return sourceSize if target size is larger
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if (sourceSize.width * sourceScale < size.width * destScale) {
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return sourceSize;
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}
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}
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return size;
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}
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}
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}
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BOOL RCTUpscalingRequired(CGSize sourceSize, CGFloat sourceScale,
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CGSize destSize, CGFloat destScale,
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RCTResizeMode 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 = RCTResizeModeStretch;
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}
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}
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switch (resizeMode) {
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case RCTResizeModeStretch:
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return destSize.width > sourceSize.width || destSize.height > sourceSize.height;
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case RCTResizeModeContain:
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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 RCTResizeModeCover:
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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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case RCTResizeModeRepeat:
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case RCTResizeModeCenter:
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return NO;
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}
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}
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UIImage *__nullable RCTDecodeImageWithData(NSData *data,
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CGSize destSize,
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CGFloat destScale,
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RCTResizeMode resizeMode)
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{
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CGImageSourceRef sourceRef = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
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if (!sourceRef) {
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return nil;
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}
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// Get original image size
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CFDictionaryRef imageProperties = CGImageSourceCopyPropertiesAtIndex(sourceRef, 0, NULL);
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if (!imageProperties) {
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CFRelease(sourceRef);
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return nil;
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}
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NSNumber *width = CFDictionaryGetValue(imageProperties, kCGImagePropertyPixelWidth);
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NSNumber *height = CFDictionaryGetValue(imageProperties, kCGImagePropertyPixelHeight);
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CGSize sourceSize = {width.doubleValue, height.doubleValue};
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CFRelease(imageProperties);
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if (CGSizeEqualToSize(destSize, CGSizeZero)) {
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destSize = sourceSize;
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if (!destScale) {
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destScale = 1;
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}
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} else if (!destScale) {
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destScale = RCTScreenScale();
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}
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if (resizeMode == UIViewContentModeScaleToFill) {
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// Decoder cannot change aspect ratio, so RCTResizeModeStretch is equivalent
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// to RCTResizeModeCover for our purposes
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resizeMode = RCTResizeModeCover;
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}
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// Calculate target size
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CGSize targetSize = RCTTargetSize(sourceSize, 1, destSize, destScale, resizeMode, NO);
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CGSize targetPixelSize = RCTSizeInPixels(targetSize, destScale);
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CGFloat maxPixelSize = fmax(fmin(sourceSize.width, targetPixelSize.width),
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fmin(sourceSize.height, targetPixelSize.height));
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NSDictionary<NSString *, NSNumber *> *options = @{
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(id)kCGImageSourceShouldAllowFloat: @YES,
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(id)kCGImageSourceCreateThumbnailWithTransform: @YES,
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(id)kCGImageSourceCreateThumbnailFromImageAlways: @YES,
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(id)kCGImageSourceThumbnailMaxPixelSize: @(maxPixelSize),
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};
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// Get thumbnail
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CGImageRef imageRef = CGImageSourceCreateThumbnailAtIndex(sourceRef, 0, (__bridge CFDictionaryRef)options);
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CFRelease(sourceRef);
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if (!imageRef) {
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return nil;
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}
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// Return image
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UIImage *image = [UIImage imageWithCGImage:imageRef
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scale:destScale
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orientation:UIImageOrientationUp];
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CGImageRelease(imageRef);
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return image;
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}
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NSDictionary<NSString *, id> *__nullable RCTGetImageMetadata(NSData *data)
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{
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CGImageSourceRef sourceRef = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
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if (!sourceRef) {
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return nil;
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}
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CFDictionaryRef imageProperties = CGImageSourceCopyPropertiesAtIndex(sourceRef, 0, NULL);
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CFRelease(sourceRef);
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return (__bridge_transfer id)imageProperties;
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}
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NSData *__nullable RCTGetImageData(UIImage *image, float quality)
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{
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NSMutableDictionary *properties = [[NSMutableDictionary alloc] initWithDictionary:@{
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(id)kCGImagePropertyOrientation : @(CGImagePropertyOrientationFromUIImageOrientation(image.imageOrientation))
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}];
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CGImageDestinationRef destination;
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CFMutableDataRef imageData = CFDataCreateMutable(NULL, 0);
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CGImageRef cgImage = image.CGImage;
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if (RCTImageHasAlpha(cgImage)) {
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// get png data
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destination = CGImageDestinationCreateWithData(imageData, kUTTypePNG, 1, NULL);
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} else {
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// get jpeg data
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destination = CGImageDestinationCreateWithData(imageData, kUTTypeJPEG, 1, NULL);
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[properties setValue:@(quality) forKey:(id)kCGImageDestinationLossyCompressionQuality];
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}
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CGImageDestinationAddImage(destination, cgImage, (__bridge CFDictionaryRef)properties);
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if (!CGImageDestinationFinalize(destination))
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{
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CFRelease(imageData);
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imageData = NULL;
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}
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CFRelease(destination);
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return (__bridge_transfer NSData *)imageData;
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}
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UIImage *__nullable RCTTransformImage(UIImage *image,
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CGSize destSize,
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CGFloat destScale,
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CGAffineTransform transform)
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{
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if (destSize.width <= 0 | destSize.height <= 0 || destScale <= 0) {
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return nil;
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}
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BOOL opaque = !RCTImageHasAlpha(image.CGImage);
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UIGraphicsBeginImageContextWithOptions(destSize, opaque, destScale);
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CGContextRef currentContext = UIGraphicsGetCurrentContext();
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CGContextConcatCTM(currentContext, transform);
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[image drawAtPoint:CGPointZero];
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UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return result;
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}
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BOOL RCTImageHasAlpha(CGImageRef image)
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{
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switch (CGImageGetAlphaInfo(image)) {
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||
|
|
case kCGImageAlphaNone:
|
||
|
|
case kCGImageAlphaNoneSkipLast:
|
||
|
|
case kCGImageAlphaNoneSkipFirst:
|
||
|
|
return NO;
|
||
|
|
default:
|
||
|
|
return YES;
|
||
|
|
}
|
||
|
|
}
|