69 lines
2.7 KiB
Objective-C
69 lines
2.7 KiB
Objective-C
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import <Foundation/Foundation.h>
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#import <GLKit/GLKit.h>
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/// Modes of rotation (clockwise) for input frames.
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typedef NS_ENUM(int, MPPFrameRotation) {
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MPPFrameRotationNone,
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MPPFrameRotationCw90,
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MPPFrameRotationCw180,
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MPPFrameRotationCw270,
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};
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typedef NS_ENUM(int, MPPFrameScaleMode) {
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// Scale the frame up to fit the drawing area, preserving aspect ratio; may letterbox.
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MPPFrameScaleModeFit,
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// Scale the frame up to fill the drawing area, preserving aspect ratio; may crop.
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MPPFrameScaleModeFillAndCrop,
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};
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/// Renders frames in a GLKView.
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@interface MPPGLViewRenderer : NSObject <GLKViewDelegate>
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/// Rendering context for display.
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@property(nonatomic) EAGLContext *glContext;
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/// The frame to be rendered next. This pixel buffer must be unlocked, and
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/// should not be modified after handing it to the renderer.
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@property(atomic, retain) __attribute__((NSObject)) CVPixelBufferRef nextPixelBufferToRender;
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/// When YES, the last drawn pixel buffer is retained by this object after it is drawn in the GLView
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/// for which it is a delegate. Otherwise it is released after it has been rendered.
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/// Set this property to YES when your GLView can be redrawn with the same pixel buffer, such as
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/// during an animation.
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@property(nonatomic, assign) BOOL retainsLastPixelBuffer;
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/// Sets which way to rotate input frames before rendering them.
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/// Default value is MPPFrameRotationNone.
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/// Note that changing the transform property of a GLKView once rendering has
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/// started causes problems inside GLKView. Instead, we perform the rotation
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/// in our rendering code.
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@property(nonatomic) MPPFrameRotation frameRotationMode;
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/// Sets how to scale the frame within the view.
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/// Default value is MPPFrameScaleModeFit.
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@property(nonatomic) MPPFrameScaleMode frameScaleMode;
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/// If YES, swap left and right. Useful for the front camera.
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@property(nonatomic) BOOL mirrored;
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/// Draws a pixel buffer to its context with the specified view size.
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- (void)drawPixelBuffer:(CVPixelBufferRef)pixelBuffer
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width:(GLfloat)viewWidth
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height:(GLfloat)viewHeight;
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@end
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