特殊需求，对Android的输出图像做镜像翻转。

Screen convert

翻转x修改

源码：frameworks/native/services/surfaceflinger/RenderEngine/ProgramCache.cpp

  String8 ProgramCache::generateVertexShader(const Key& needs) {      Formatter vs;      if (needs.isTexturing()) {          vs << "attribute vec4 texCoords;"             << "varying vec2 outTexCoords;";      }      vs << "attribute vec4 position;"         << "uniform mat4 projection;"         << "uniform mat4 texture;"         << "void main(void) {" << indent << "gl_Position = projection * position;"         << "gl_Position.x = float(0) - gl_Position.x;";// 修改内容      if (needs.isTexturing()) {          vs << "outTexCoords = (texture * texCoords).st;";      }      vs << dedent << "}";      return vs.getString();  }

diff

  diff --git a/android9.0.0/frameworks/native/services/surfaceflinger/RenderEngine/ProgramCache.cpp b/android9.0.0/frameworks/native/services/surfaceflinger/RenderEngine/ProgramCache.cpp  index 9dc6858566..45545665b6 100644  --- a/android9.0.0/frameworks/native/services/surfaceflinger/RenderEngine/ProgramCache.cpp  +++ b/android9.0.0/frameworks/native/services/surfaceflinger/RenderEngine/ProgramCache.cpp  @@ -523,7 +523,8 @@ String8 ProgramCache::generateVertexShader(const Key& needs) {       vs << "attribute vec4 position;"          << "uniform mat4 projection;"          << "uniform mat4 texture;"  -       << "void main(void) {" << indent << "gl_Position = projection * position;";  +       << "void main(void) {" << indent << "gl_Position = projection * position;"  +       << "gl_Position.x = float(0) - gl_Position.x;";       if (needs.isTexturing()) {           vs << "outTexCoords = (texture * texCoords).st;";       }

Android P系统输出图像镜像翻转实现

Screen convert

翻转x修改

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