7 #include "flutter/fml/platform/darwin/cf_utils.h"
13 @property(nonatomic, weak) id<FlutterViewEngineDelegate> delegate;
17 BOOL _isWideGamutEnabled;
20 - (instancetype)init {
21 NSAssert(NO,
@"FlutterView must initWithDelegate");
26 NSAssert(NO,
@"FlutterView must initWithDelegate");
31 NSAssert(NO,
@"FlutterView must initWithDelegate");
36 if (@available(iOS 13.0, *)) {
37 return self.window.windowScene.screen;
39 return UIScreen.mainScreen;
42 - (MTLPixelFormat)pixelFormat {
43 if ([
self.layer isKindOfClass:[CAMetalLayer
class]]) {
46 #pragma clang diagnostic push
47 #pragma clang diagnostic ignored "-Wunguarded-availability-new"
48 CAMetalLayer* layer = (CAMetalLayer*)
self.layer;
49 return layer.pixelFormat;
51 return MTLPixelFormatBGRA8Unorm;
53 - (BOOL)isWideGamutSupported {
54 if (!
self.delegate.isUsingImpeller) {
58 FML_DCHECK(
self.screen);
63 return self.screen.traitCollection.displayGamut != UIDisplayGamutSRGB;
68 enableWideGamut:(BOOL)isWideGamutEnabled {
69 if (delegate == nil) {
70 NSLog(
@"FlutterView delegate was nil.");
74 self = [
super initWithFrame:CGRectNull];
78 _isWideGamutEnabled = isWideGamutEnabled;
79 self.layer.opaque = opaque;
85 static void PrintWideGamutWarningOnce() {
86 static BOOL did_print = NO;
90 FML_DLOG(WARNING) <<
"Rendering wide gamut colors is turned on but isn't "
91 "supported, downgrading the color gamut to sRGB.";
95 - (void)layoutSubviews {
96 if ([
self.layer isKindOfClass:[CAMetalLayer
class]]) {
99 #pragma clang diagnostic push
100 #pragma clang diagnostic ignored "-Wunguarded-availability-new"
101 CAMetalLayer* layer = (CAMetalLayer*)
self.layer;
102 #pragma clang diagnostic pop
103 CGFloat screenScale =
self.screen.scale;
104 layer.allowsGroupOpacity = YES;
105 layer.contentsScale = screenScale;
106 layer.rasterizationScale = screenScale;
107 layer.framebufferOnly = flutter::Settings::kSurfaceDataAccessible ? NO : YES;
108 BOOL isWideGamutSupported =
self.isWideGamutSupported;
109 if (_isWideGamutEnabled && isWideGamutSupported) {
110 fml::CFRef<CGColorSpaceRef> srgb(CGColorSpaceCreateWithName(kCGColorSpaceExtendedSRGB));
111 layer.colorspace = srgb;
112 layer.pixelFormat = MTLPixelFormatBGRA10_XR;
113 }
else if (_isWideGamutEnabled && !isWideGamutSupported) {
114 PrintWideGamutWarningOnce();
118 [
super layoutSubviews];
123 + (BOOL)forceSoftwareRendering {
127 + (void)setForceSoftwareRendering:(BOOL)forceSoftwareRendering {
131 + (Class)layerClass {
136 - (void)drawLayer:(CALayer*)layer inContext:(CGContextRef)context {
137 TRACE_EVENT0(
"flutter",
"SnapshotFlutterView");
139 if (layer !=
self.layer || context ==
nullptr) {
143 auto screenshot = [_delegate takeScreenshot:flutter::Rasterizer::ScreenshotType::UncompressedImage
146 if (!screenshot.data || screenshot.data->isEmpty() || screenshot.frame_size.isEmpty()) {
150 NSData* data = [NSData dataWithBytes:const_cast<void*>(screenshot.data->data())
151 length:screenshot.data->size()];
153 fml::CFRef<CGDataProviderRef> image_data_provider(
154 CGDataProviderCreateWithCFData(
reinterpret_cast<CFDataRef
>(data)));
156 fml::CFRef<CGColorSpaceRef> colorspace(CGColorSpaceCreateDeviceRGB());
159 size_t bits_per_component = 8u;
160 size_t bits_per_pixel = 32u;
161 size_t bytes_per_row_multiplier = 4u;
162 CGBitmapInfo bitmap_info =
163 static_cast<CGBitmapInfo
>(
static_cast<uint32_t
>(kCGImageAlphaPremultipliedLast) |
164 static_cast<uint32_t
>(kCGBitmapByteOrder32Big));
166 switch (screenshot.pixel_format) {
167 case flutter::Rasterizer::ScreenshotFormat::kUnknown:
168 case flutter::Rasterizer::ScreenshotFormat::kR8G8B8A8UNormInt:
171 case flutter::Rasterizer::ScreenshotFormat::kB8G8R8A8UNormInt:
174 static_cast<CGBitmapInfo
>(
static_cast<uint32_t
>(kCGImageAlphaPremultipliedFirst) |
175 static_cast<uint32_t
>(kCGBitmapByteOrder32Little));
177 case flutter::Rasterizer::ScreenshotFormat::kR16G16B16A16Float:
178 bits_per_component = 16u;
179 bits_per_pixel = 64u;
180 bytes_per_row_multiplier = 8u;
182 static_cast<CGBitmapInfo
>(
static_cast<uint32_t
>(kCGImageAlphaPremultipliedLast) |
183 static_cast<uint32_t
>(kCGBitmapFloatComponents) |
184 static_cast<uint32_t
>(kCGBitmapByteOrder16Little));
188 fml::CFRef<CGImageRef> image(CGImageCreate(
189 screenshot.frame_size.width(),
190 screenshot.frame_size.height(),
193 bytes_per_row_multiplier * screenshot.frame_size.width(),
199 kCGRenderingIntentDefault
202 const CGRect frame_rect =
203 CGRectMake(0.0, 0.0, screenshot.frame_size.width(), screenshot.frame_size.height());
204 CGContextSaveGState(context);
206 CGFloat height = CGBitmapContextGetHeight(context);
208 height = CGFloat(screenshot.frame_size.height());
210 CGContextTranslateCTM(context, 0.0, height);
211 CGContextScaleCTM(context, 1.0, -1.0);
212 CGContextDrawImage(context, frame_rect, image);
213 CGContextRestoreGState(context);
216 - (BOOL)isAccessibilityElement {
225 [
self.delegate flutterViewAccessibilityDidCall];
239 - (NSArray<id<UIFocusItem>>*)focusItemsInRect:(CGRect)rect {
240 NSObject* rootAccessibilityElement =
241 [
self.accessibilityElements count] > 0 ?
self.accessibilityElements[0] : nil;
243 ? @[ [rootAccessibilityElement accessibilityElementAtIndex:0] ]
247 - (NSArray<id<UIFocusEnvironment>>*)preferredFocusEnvironments {