--- /dev/null
+/*
+ * 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 <endian.h>
+
+#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<const uint32_t*>(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<uint8_t>(rgb & kRed5)
+#define G16(rgb) static_cast<uint8_t>((rgb & kGreen6) >> 5)
+#define B16(rgb) static_cast<uint8_t>((rgb & kBlue5) >> 11)
+/* Make 8 bits red, green, and blue, extracted from RGB565 word. */
+#define R16_32(rgb) static_cast<uint8_t>(((rgb & kRed5) << 3) | ((rgb & kRed5) >> 2))
+#define G16_32(rgb) static_cast<uint8_t>(((rgb & kGreen6) >> 3) | ((rgb & kGreen6) >> 9))
+#define B16_32(rgb) static_cast<uint8_t>(((rgb & kBlue5) >> 8) | ((rgb & kBlue5) >> 14))
+/* Extract red, green, and blue bytes from RGB32 dword. */
+#define R32(rgb) static_cast<uint8_t>(rgb & kRed8)
+#define G32(rgb) static_cast<uint8_t>(((rgb & kGreen8) >> 8) & 0xff)
+#define B32(rgb) static_cast<uint8_t>(((rgb & kBlue8) >> 16) & 0xff)
+/* Build RGB565 word from red, green, and blue bytes. */
+#define RGB565(r, g, b) static_cast<uint16_t>((((static_cast<uint16_t>(b) << 6) | g) << 5) | r)
+/* Build RGB32 dword from red, green, and blue bytes. */
+#define RGB32(r, g, b) static_cast<uint32_t>((((static_cast<uint32_t>(b) << 8) | g) << 8) | r)
+#else // __BYTE_ORDER
+/* Extract red, green, and blue bytes from RGB565 word. */
+#define R16(rgb) static_cast<uint8_t>((rgb & kRed5) >> 11)
+#define G16(rgb) static_cast<uint8_t>((rgb & kGreen6) >> 5)
+#define B16(rgb) static_cast<uint8_t>(rgb & kBlue5)
+/* Make 8 bits red, green, and blue, extracted from RGB565 word. */
+#define R16_32(rgb) static_cast<uint8_t>(((rgb & kRed5) >> 8) | ((rgb & kRed5) >> 14))
+#define G16_32(rgb) static_cast<uint8_t>(((rgb & kGreen6) >> 3) | ((rgb & kGreen6) >> 9))
+#define B16_32(rgb) static_cast<uint8_t>(((rgb & kBlue5) << 3) | ((rgb & kBlue5) >> 2))
+/* Extract red, green, and blue bytes from RGB32 dword. */
+#define R32(rgb) static_cast<uint8_t>((rgb & kRed8) >> 16)
+#define G32(rgb) static_cast<uint8_t>((rgb & kGreen8) >> 8)
+#define B32(rgb) static_cast<uint8_t>(rgb & kBlue8)
+/* Build RGB565 word from red, green, and blue bytes. */
+#define RGB565(r, g, b) static_cast<uint16_t>((((static_cast<uint16_t>(r) << 6) | g) << 5) | b)
+/* Build RGB32 dword from red, green, and blue bytes. */
+#define RGB32(r, g, b) static_cast<uint32_t>((((static_cast<uint32_t>(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 */
Code Review / iec.git / blobdiff