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8 | #import "RCTConvert+ART.h"
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9 |
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10 | #import <React/RCTFont.h>
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11 | #import <React/RCTLog.h>
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12 |
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13 | #import "ARTLinearGradient.h"
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14 | #import "ARTPattern.h"
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15 | #import "ARTRadialGradient.h"
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16 | #import "ARTSolidColor.h"
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17 |
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18 | @implementation RCTConvert (ART)
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19 |
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20 | + (CGPathRef)CGPath:(id)json
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21 | {
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22 | NSArray *arr = [self NSNumberArray:json];
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23 |
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24 | NSUInteger count = [arr count];
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25 |
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26 | #define NEXT_VALUE [self double:arr[i++]]
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27 |
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28 | CGMutablePathRef path = CGPathCreateMutable();
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29 | CGPathMoveToPoint(path, NULL, 0, 0);
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30 |
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31 | @try {
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32 | NSUInteger i = 0;
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33 | while (i < count) {
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34 | NSUInteger type = [arr[i++] unsignedIntegerValue];
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35 | switch (type) {
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36 | case 0:
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37 | CGPathMoveToPoint(path, NULL, NEXT_VALUE, NEXT_VALUE);
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38 | break;
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39 | case 1:
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40 | CGPathCloseSubpath(path);
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41 | break;
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42 | case 2:
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43 | CGPathAddLineToPoint(path, NULL, NEXT_VALUE, NEXT_VALUE);
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44 | break;
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45 | case 3:
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46 | CGPathAddCurveToPoint(path, NULL, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE);
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47 | break;
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48 | case 4:
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49 | CGPathAddArc(path, NULL, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE, NEXT_VALUE == 0);
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50 | break;
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51 | default:
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52 | RCTLogError(@"Invalid CGPath type %llu at element %llu of %@", (unsigned long long)type, (unsigned long long)i, arr);
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53 | CGPathRelease(path);
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54 | return NULL;
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55 | }
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56 | }
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57 | }
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58 | @catch (NSException *exception) {
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59 | RCTLogError(@"Invalid CGPath format: %@", arr);
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60 | CGPathRelease(path);
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61 | return NULL;
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62 | }
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63 |
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64 | return (CGPathRef)CFAutorelease(path);
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65 | }
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66 |
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67 | RCT_ENUM_CONVERTER(CTTextAlignment, (@{
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68 | @"auto": @(kCTTextAlignmentNatural),
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69 | @"left": @(kCTTextAlignmentLeft),
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70 | @"center": @(kCTTextAlignmentCenter),
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71 | @"right": @(kCTTextAlignmentRight),
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72 | @"justify": @(kCTTextAlignmentJustified),
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73 | }), kCTTextAlignmentNatural, integerValue)
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74 |
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75 | // This takes a tuple of text lines and a font to generate a CTLine for each text line.
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76 | // This prepares everything for rendering a frame of text in ARTText.
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77 | + (ARTTextFrame)ARTTextFrame:(id)json
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78 | {
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79 | NSDictionary *dict = [self NSDictionary:json];
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80 | ARTTextFrame frame;
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81 | frame.count = 0;
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82 |
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83 | NSArray *lines = [self NSArray:dict[@"lines"]];
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84 | NSUInteger lineCount = [lines count];
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85 | if (lineCount == 0) {
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86 | return frame;
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87 | }
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88 |
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89 | CTFontRef font = (__bridge CTFontRef)[self UIFont:dict[@"font"]];
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90 | if (!font) {
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91 | return frame;
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92 | }
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93 |
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94 | // Create a dictionary for this font
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95 | CFDictionaryRef attributes = (__bridge CFDictionaryRef)@{
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96 | (NSString *)kCTFontAttributeName:(__bridge id)font,
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97 | (NSString *)kCTForegroundColorFromContextAttributeName: @YES
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98 | };
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99 |
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100 | // Set up text frame with font metrics
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101 | CGFloat size = CTFontGetSize(font);
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102 | frame.count = lineCount;
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103 | frame.baseLine = size; // estimate base line
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104 | frame.lineHeight = size * 1.1; // Base on ART canvas line height estimate
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105 | frame.lines = malloc(sizeof(CTLineRef) * lineCount);
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106 | frame.widths = malloc(sizeof(CGFloat) * lineCount);
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107 |
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108 | [lines enumerateObjectsUsingBlock:^(NSString *text, NSUInteger i, BOOL *stop) {
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109 |
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110 | CFStringRef string = (__bridge CFStringRef)text;
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111 | CFAttributedStringRef attrString = CFAttributedStringCreate(kCFAllocatorDefault, string, attributes);
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112 | CTLineRef line = CTLineCreateWithAttributedString(attrString);
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113 | CFRelease(attrString);
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114 |
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115 | frame.lines[i] = line;
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116 | frame.widths[i] = CTLineGetTypographicBounds(line, NULL, NULL, NULL);
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117 | }];
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118 |
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119 | return frame;
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120 | }
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121 |
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122 | + (ARTCGFloatArray)ARTCGFloatArray:(id)json
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123 | {
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124 | NSArray *arr = [self NSNumberArray:json];
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125 | NSUInteger count = arr.count;
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126 |
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127 | ARTCGFloatArray array;
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128 | array.count = count;
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129 | array.array = NULL;
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130 |
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131 | if (count) {
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132 | // Ideally, these arrays should already use the same memory layout.
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133 | // In that case we shouldn't need this new malloc.
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134 | array.array = malloc(sizeof(CGFloat) * count);
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135 | for (NSUInteger i = 0; i < count; i++) {
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136 | array.array[i] = [arr[i] doubleValue];
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137 | }
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138 | }
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139 |
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140 | return array;
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141 | }
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142 |
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143 | + (ARTBrush *)ARTBrush:(id)json
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144 | {
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145 | NSArray *arr = [self NSArray:json];
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146 | NSUInteger type = [self NSUInteger:arr.firstObject];
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147 | switch (type) {
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148 | case 0: // solid color
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149 | // These are probably expensive allocations since it's often the same value.
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150 | // We should memoize colors but look ups may be just as expensive.
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151 | return [[ARTSolidColor alloc] initWithArray:arr];
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152 | case 1: // linear gradient
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153 | return [[ARTLinearGradient alloc] initWithArray:arr];
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154 | case 2: // radial gradient
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155 | return [[ARTRadialGradient alloc] initWithArray:arr];
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156 | case 3: // pattern
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157 | return [[ARTPattern alloc] initWithArray:arr];
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158 | default:
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159 | RCTLogError(@"Unknown brush type: %llu", (unsigned long long)type);
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160 | return nil;
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161 | }
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162 | }
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163 |
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164 | + (CGPoint)CGPoint:(id)json offset:(NSUInteger)offset
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165 | {
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166 | NSArray *arr = [self NSArray:json];
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167 | if (arr.count < offset + 2) {
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168 | RCTLogError(@"Too few elements in array (expected at least %llu): %@", (unsigned long long)(2 + offset), arr);
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169 | return CGPointZero;
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170 | }
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171 | return (CGPoint){
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172 | [self CGFloat:arr[offset]],
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173 | [self CGFloat:arr[offset + 1]],
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174 | };
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175 | }
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176 |
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177 | + (CGRect)CGRect:(id)json offset:(NSUInteger)offset
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178 | {
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179 | NSArray *arr = [self NSArray:json];
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180 | if (arr.count < offset + 4) {
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181 | RCTLogError(@"Too few elements in array (expected at least %llu): %@", (unsigned long long)(4 + offset), arr);
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182 | return CGRectZero;
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183 | }
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184 | return (CGRect){
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185 | {[self CGFloat:arr[offset]], [self CGFloat:arr[offset + 1]]},
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186 | {[self CGFloat:arr[offset + 2]], [self CGFloat:arr[offset + 3]]},
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187 | };
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188 | }
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189 |
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190 | + (CGColorRef)CGColor:(id)json offset:(NSUInteger)offset
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191 | {
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192 | NSArray *arr = [self NSArray:json];
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193 | if (arr.count < offset + 4) {
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194 | RCTLogError(@"Too few elements in array (expected at least %llu): %@", (unsigned long long)(4 + offset), arr);
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195 | return NULL;
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196 | }
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197 | return [self CGColor:[arr subarrayWithRange:(NSRange){offset, 4}]];
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198 | }
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199 |
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200 | + (CGGradientRef)CGGradient:(id)json offset:(NSUInteger)offset
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201 | {
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202 | NSArray *arr = [self NSArray:json];
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203 | if (arr.count < offset) {
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204 | RCTLogError(@"Too few elements in array (expected at least %llu): %@", (unsigned long long)offset, arr);
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205 | return NULL;
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206 | }
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207 | arr = [arr subarrayWithRange:(NSRange){offset, arr.count - offset}];
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208 | ARTCGFloatArray colorsAndOffsets = [self ARTCGFloatArray:arr];
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209 | size_t stops = colorsAndOffsets.count / 5;
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210 | CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
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211 | CGGradientRef gradient = CGGradientCreateWithColorComponents(
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212 | rgb,
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213 | colorsAndOffsets.array,
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214 | colorsAndOffsets.array + stops * 4,
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215 | stops
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216 | );
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217 | CGColorSpaceRelease(rgb);
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218 | free(colorsAndOffsets.array);
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219 | return (CGGradientRef)CFAutorelease(gradient);
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220 | }
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221 |
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222 | @end
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