探寻Android系统中的Old CRT OFF-Screen Animation(四)

2132 }

2133 };

2134

2135 class h_stretch {

2136 const GLfloat hw_w, hw_h;

2137 public:

2138 h_stretch(uint32_t hw_w, uint32_t hw_h)

2139 : hw_w(hw_w), hw_h(hw_h) {

2140 }

2141 void operator()(GLfloat* vtx, float v) {

2142 const GLfloat w = hw_w - (hw_w * v);

2143 const GLfloat h = 1.0f;

2144 const GLfloat x = (hw_w - w) * 0.5f;

2145 const GLfloat y = (hw_h - h) * 0.5f;

2146 vtx[0] = x; vtx[1] = y;

2147 vtx[2] = x; vtx[3] = y + h;

2148 vtx[4] = x + w; vtx[5] = y + h;

2149 vtx[6] = x + w; vtx[7] = y;

2150 }

2151 };

2152

2153 // the full animation is 24 frames

2154 const int nbFrames = 12;

2155 s_curve_interpolator itr(nbFrames, 7.5f);

2156 s_curve_interpolator itg(nbFrames, 8.0f);

2157 s_curve_interpolator itb(nbFrames, 8.5f);

2158

2159 v_stretch vverts(hw_w, hw_h);

2160 glEnable(GL_BLEND);

2161 glBlendFunc(GL_ONE, GL_ONE);

2162 for (int i=0 ; i

2163 float x, y, w, h;

2164 const float vr = itr(i);

2165 const float vg = itg(i);

2166 const float vb = itb(i);

2167

2168 // clear screen

2169 glColorMask(1,1,1,1);

2170 glClear(GL_COLOR_BUFFER_BIT);

2171 glEnable(GL_TEXTURE_2D);

2172

2173 // draw the red plane

2174 vverts(vtx, vr);

2175 glColorMask(1,0,0,1);

2176 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

2177

2178 // draw the green plane

2179 vverts(vtx, vg);

2180 glColorMask(0,1,0,1);

2181 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

2182

2183 // draw the blue plane

2184 vverts(vtx, vb);

2185 glColorMask(0,0,1,1);

2186 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

2187

2188 // draw the white highlight (we use the last vertices)

2189 glDisable(GL_TEXTURE_2D);

2190 glColorMask(1,1,1,1);

2191 glColor4f(vg, vg, vg, 1);

2192 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

2193 hw.flip(screenBounds);

2194 }

2195

2196 h_stretch hverts(hw_w, hw_h);

2197 glDisable(GL_BLEND);

2198 glDisable(GL_TEXTURE_2D);

2199 glColorMask(1,1,1,1);

2200 for (int i=0 ; i

2201 const float v = itg(i);

2202 hverts(vtx, v);

2203 glClear(GL_COLOR_BUFFER_BIT);

2204 glColor4f(1-v, 1-v, 1-v, 1);

2205 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

2206 hw.flip(screenBounds);

2207 }

2208

2209 glColorMask(1,1,1,1);

2210 glEnable(GL_SCISSOR_TEST);

2211 glDisableClientState(GL_TEXTURE_COORD_ARRAY);

2212 glDeleteTextures(1, &tname);

2213 return NO_ERROR;

2214 }

2215

OK，看完代码回来，首先是PowerManagerService.java中

mAnimationSetting如果标记为ANIM_SETTING_OFF，则打开旧CRT动画。

下面关屏动作run()中，因为我们将config_animateScreenLights置为false，因此mAnimateScreenLights为fasle

分支进入else，执行nativeStartSurfaceFlingerAnimation()函数。

nativeStartSurfaceFlingerAnimation()函数是一个JNI调用，在com_android_server_PowerManagerService.cpp文件中，

对应surfaceflinger的s->turnElectronBeamOff(mode)函数。

好的，现在跳入SurfaceFlinger.cpp函数，具体调用顺序是：

tu