/* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef HW_EMULATOR_CAMERA_CONVERTERS_H #define HW_EMULATOR_CAMERA_CONVERTERS_H #include #ifndef __BYTE_ORDER #error "could not determine byte order" #endif /* * Contains declaration of framebuffer conversion routines. * * NOTE: RGB and big/little endian considerations. Wherewer in this code RGB * pixels are represented as WORD, or DWORD, the color order inside the * WORD / DWORD matches the one that would occur if that WORD / DWORD would have * been read from the typecasted framebuffer: * * const uint32_t rgb = *reinterpret_cast(framebuffer); * * So, if this code runs on the little endian CPU, red color in 'rgb' would be * masked as 0x000000ff, and blue color would be masked as 0x00ff0000, while if * the code runs on a big endian CPU, the red color in 'rgb' would be masked as * 0xff000000, and blue color would be masked as 0x0000ff00, */ namespace android { /* * RGB565 color masks */ #if __BYTE_ORDER == __LITTLE_ENDIAN static const uint16_t kRed5 = 0x001f; static const uint16_t kGreen6 = 0x07e0; static const uint16_t kBlue5 = 0xf800; #else // __BYTE_ORDER static const uint16_t kRed5 = 0xf800; static const uint16_t kGreen6 = 0x07e0; static const uint16_t kBlue5 = 0x001f; #endif // __BYTE_ORDER static const uint32_t kBlack16 = 0x0000; static const uint32_t kWhite16 = kRed5 | kGreen6 | kBlue5; /* * RGB32 color masks */ #if __BYTE_ORDER == __LITTLE_ENDIAN static const uint32_t kRed8 = 0x000000ff; static const uint32_t kGreen8 = 0x0000ff00; static const uint32_t kBlue8 = 0x00ff0000; #else // __BYTE_ORDER static const uint32_t kRed8 = 0x00ff0000; static const uint32_t kGreen8 = 0x0000ff00; static const uint32_t kBlue8 = 0x000000ff; #endif // __BYTE_ORDER static const uint32_t kBlack32 = 0x00000000; static const uint32_t kWhite32 = kRed8 | kGreen8 | kBlue8; /* * Extracting, and saving color bytes from / to WORD / DWORD RGB. */ #if __BYTE_ORDER == __LITTLE_ENDIAN /* Extract red, green, and blue bytes from RGB565 word. */ #define R16(rgb) static_cast(rgb & kRed5) #define G16(rgb) static_cast((rgb & kGreen6) >> 5) #define B16(rgb) static_cast((rgb & kBlue5) >> 11) /* Make 8 bits red, green, and blue, extracted from RGB565 word. */ #define R16_32(rgb) static_cast(((rgb & kRed5) << 3) | ((rgb & kRed5) >> 2)) #define G16_32(rgb) static_cast(((rgb & kGreen6) >> 3) | ((rgb & kGreen6) >> 9)) #define B16_32(rgb) static_cast(((rgb & kBlue5) >> 8) | ((rgb & kBlue5) >> 14)) /* Extract red, green, and blue bytes from RGB32 dword. */ #define R32(rgb) static_cast(rgb & kRed8) #define G32(rgb) static_cast(((rgb & kGreen8) >> 8) & 0xff) #define B32(rgb) static_cast(((rgb & kBlue8) >> 16) & 0xff) /* Build RGB565 word from red, green, and blue bytes. */ #define RGB565(r, g, b) static_cast((((static_cast(b) << 6) | g) << 5) | r) /* Build RGB32 dword from red, green, and blue bytes. */ #define RGB32(r, g, b) static_cast((((static_cast(b) << 8) | g) << 8) | r) #else // __BYTE_ORDER /* Extract red, green, and blue bytes from RGB565 word. */ #define R16(rgb) static_cast((rgb & kRed5) >> 11) #define G16(rgb) static_cast((rgb & kGreen6) >> 5) #define B16(rgb) static_cast(rgb & kBlue5) /* Make 8 bits red, green, and blue, extracted from RGB565 word. */ #define R16_32(rgb) static_cast(((rgb & kRed5) >> 8) | ((rgb & kRed5) >> 14)) #define G16_32(rgb) static_cast(((rgb & kGreen6) >> 3) | ((rgb & kGreen6) >> 9)) #define B16_32(rgb) static_cast(((rgb & kBlue5) << 3) | ((rgb & kBlue5) >> 2)) /* Extract red, green, and blue bytes from RGB32 dword. */ #define R32(rgb) static_cast((rgb & kRed8) >> 16) #define G32(rgb) static_cast((rgb & kGreen8) >> 8) #define B32(rgb) static_cast(rgb & kBlue8) /* Build RGB565 word from red, green, and blue bytes. */ #define RGB565(r, g, b) static_cast((((static_cast(r) << 6) | g) << 5) | b) /* Build RGB32 dword from red, green, and blue bytes. */ #define RGB32(r, g, b) static_cast((((static_cast(r) << 8) | g) << 8) | b) #endif // __BYTE_ORDER /* An union that simplifies breaking 32 bit RGB into separate R, G, and B colors. */ typedef union RGB32_t { uint32_t color; struct { #if __BYTE_ORDER == __LITTLE_ENDIAN uint8_t r; uint8_t g; uint8_t b; uint8_t a; #else // __BYTE_ORDER uint8_t a; uint8_t b; uint8_t g; uint8_t r; #endif // __BYTE_ORDER }; } RGB32_t; /* Clips a value to the unsigned 0-255 range, treating negative values as zero. */ static __inline__ int clamp(int x) { if (x > 255) return 255; if (x < 0) return 0; return x; } /******************************************************************************** * Basics of RGB -> YUV conversion *******************************************************************************/ /* * RGB -> YUV conversion macros */ #define RGB2Y(r, g, b) (uint8_t)(((66 * (r) + 129 * (g) + 25 * (b) + 128) >> 8) + 16) #define RGB2U(r, g, b) (uint8_t)(((-38 * (r) - 74 * (g) + 112 * (b) + 128) >> 8) + 128) #define RGB2V(r, g, b) (uint8_t)(((112 * (r) - 94 * (g) - 18 * (b) + 128) >> 8) + 128) /* Converts R8 G8 B8 color to YUV. */ static __inline__ void R8G8B8ToYUV(uint8_t r, uint8_t g, uint8_t b, uint8_t* y, uint8_t* u, uint8_t* v) { *y = RGB2Y((int)r, (int)g, (int)b); *u = RGB2U((int)r, (int)g, (int)b); *v = RGB2V((int)r, (int)g, (int)b); } /* Converts RGB565 color to YUV. */ static __inline__ void RGB565ToYUV(uint16_t rgb, uint8_t* y, uint8_t* u, uint8_t* v) { R8G8B8ToYUV(R16_32(rgb), G16_32(rgb), B16_32(rgb), y, u, v); } /* Converts RGB32 color to YUV. */ static __inline__ void RGB32ToYUV(uint32_t rgb, uint8_t* y, uint8_t* u, uint8_t* v) { RGB32_t rgb_c; rgb_c.color = rgb; R8G8B8ToYUV(rgb_c.r, rgb_c.g, rgb_c.b, y, u, v); } /******************************************************************************** * Basics of YUV -> RGB conversion. * Note that due to the fact that guest uses RGB only on preview window, and the * RGB format that is used is RGB565, we can limit YUV -> RGB conversions to * RGB565 only. *******************************************************************************/ /* * YUV -> RGB conversion macros */ /* "Optimized" macros that take specialy prepared Y, U, and V values: * C = Y - 16 * D = U - 128 * E = V - 128 */ #define YUV2RO(C, D, E) clamp((298 * (C) + 409 * (E) + 128) >> 8) #define YUV2GO(C, D, E) clamp((298 * (C) - 100 * (D) - 208 * (E) + 128) >> 8) #define YUV2BO(C, D, E) clamp((298 * (C) + 516 * (D) + 128) >> 8) /* * Main macros that take the original Y, U, and V values */ #define YUV2R(y, u, v) clamp((298 * ((y)-16) + 409 * ((v)-128) + 128) >> 8) #define YUV2G(y, u, v) clamp((298 * ((y)-16) - 100 * ((u)-128) - 208 * ((v)-128) + 128) >> 8) #define YUV2B(y, u, v) clamp((298 * ((y)-16) + 516 * ((u)-128) + 128) >> 8) /* Converts YUV color to RGB565. */ static __inline__ uint16_t YUVToRGB565(int y, int u, int v) { /* Calculate C, D, and E values for the optimized macro. */ y -= 16; u -= 128; v -= 128; const uint16_t r = (YUV2RO(y,u,v) >> 3) & 0x1f; const uint16_t g = (YUV2GO(y,u,v) >> 2) & 0x3f; const uint16_t b = (YUV2BO(y,u,v) >> 3) & 0x1f; return RGB565(r, g, b); } /* Converts YUV color to RGB32. */ static __inline__ uint32_t YUVToRGB32(int y, int u, int v) { /* Calculate C, D, and E values for the optimized macro. */ y -= 16; u -= 128; v -= 128; RGB32_t rgb; rgb.r = YUV2RO(y,u,v) & 0xff; rgb.g = YUV2GO(y,u,v) & 0xff; rgb.b = YUV2BO(y,u,v) & 0xff; return rgb.color; } /* YUV pixel descriptor. */ struct YUVPixel { uint8_t Y; uint8_t U; uint8_t V; inline YUVPixel() : Y(0), U(0), V(0) { } inline explicit YUVPixel(uint16_t rgb565) { RGB565ToYUV(rgb565, &Y, &U, &V); } inline explicit YUVPixel(uint32_t rgb32) { RGB32ToYUV(rgb32, &Y, &U, &V); } inline void get(uint8_t* pY, uint8_t* pU, uint8_t* pV) const { *pY = Y; *pU = U; *pV = V; } }; /* Converts an YV12 framebuffer to RGB565 framebuffer. * Param: * yv12 - YV12 framebuffer. * rgb - RGB565 framebuffer. * width, height - Dimensions for both framebuffers. */ void YV12ToRGB565(const void* yv12, void* rgb, int width, int height); /* Converts an YV12 framebuffer to RGB32 framebuffer. * Param: * yv12 - YV12 framebuffer. * rgb - RGB32 framebuffer. * width, height - Dimensions for both framebuffers. */ void YV12ToRGB32(const void* yv12, void* rgb, int width, int height); /* Converts an YU12 framebuffer to RGB32 framebuffer. * Param: * yu12 - YU12 framebuffer. * rgb - RGB32 framebuffer. * width, height - Dimensions for both framebuffers. */ void YU12ToRGB32(const void* yu12, void* rgb, int width, int height); /* Converts an NV12 framebuffer to RGB565 framebuffer. * Param: * nv12 - NV12 framebuffer. * rgb - RGB565 framebuffer. * width, height - Dimensions for both framebuffers. */ void NV12ToRGB565(const void* nv12, void* rgb, int width, int height); /* Converts an NV12 framebuffer to RGB32 framebuffer. * Param: * nv12 - NV12 framebuffer. * rgb - RGB32 framebuffer. * width, height - Dimensions for both framebuffers. */ void NV12ToRGB32(const void* nv12, void* rgb, int width, int height); /* Converts an NV21 framebuffer to RGB565 framebuffer. * Param: * nv21 - NV21 framebuffer. * rgb - RGB565 framebuffer. * width, height - Dimensions for both framebuffers. */ void NV21ToRGB565(const void* nv21, void* rgb, int width, int height); /* Converts an NV21 framebuffer to RGB32 framebuffer. * Param: * nv21 - NV21 framebuffer. * rgb - RGB32 framebuffer. * width, height - Dimensions for both framebuffers. */ void NV21ToRGB32(const void* nv21, void* rgb, int width, int height); }; /* namespace android */ #endif /* HW_EMULATOR_CAMERA_CONVERTERS_H */