twitchapon-anim

Basic Twitchapon Receiver/Visuals
git clone git://bsandro.tech/twitchapon-anim
Log | Files | Refs | README | LICENSE

buffer.go (1220B)


      1 // Copyright 2015 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package gldriver
      6 
      7 import "image"
      8 
      9 type bufferImpl struct {
     10 	// buf should always be equal to (i.e. the same ptr, len, cap as) rgba.Pix.
     11 	// It is a separate, redundant field in order to detect modifications to
     12 	// the rgba field that are invalid as per the screen.Buffer documentation.
     13 	buf  []byte
     14 	rgba image.RGBA
     15 	size image.Point
     16 }
     17 
     18 func (b *bufferImpl) Release()                {}
     19 func (b *bufferImpl) Size() image.Point       { return b.size }
     20 func (b *bufferImpl) Bounds() image.Rectangle { return image.Rectangle{Max: b.size} }
     21 func (b *bufferImpl) RGBA() *image.RGBA       { return &b.rgba }
     22 
     23 func (b *bufferImpl) preUpload() {
     24 	// Check that the program hasn't tried to modify the rgba field via the
     25 	// pointer returned by the bufferImpl.RGBA method. This check doesn't catch
     26 	// 100% of all cases; it simply tries to detect some invalid uses of a
     27 	// screen.Buffer such as:
     28 	//	*buffer.RGBA() = anotherImageRGBA
     29 	if len(b.buf) != 0 && len(b.rgba.Pix) != 0 && &b.buf[0] != &b.rgba.Pix[0] {
     30 		panic("gldriver: invalid Buffer.RGBA modification")
     31 	}
     32 }