text: /*
   * Intel XScale PXA255/270 LCDC emulation.
   *
   * Copyright (c) 2006 Openedhand Ltd.
   * Written by Andrzej Zaborowski <balrog@zabor.org>
   *
   * This code is licensed under the GPLv2.
   *
   * Framebuffer format conversion routines.
   */
  
  # define SKIP_PIXEL(to)		to += deststep
  #if BITS == 8
  # define COPY_PIXEL(to, from)  do { *to = from; SKIP_PIXEL(to); } while (0)
  #elif BITS == 15 || BITS == 16
  # define COPY_PIXEL(to, from)    \
      do {                         \
          *(uint16_t *) to = from; \
          SKIP_PIXEL(to);          \
      } while (0)
  #elif BITS == 24
  # define COPY_PIXEL(to, from)     \
      do {                          \
          *(uint16_t *) to = from;  \
          *(to + 2) = (from) >> 16; \
          SKIP_PIXEL(to);           \
      } while (0)
  #elif BITS == 32
  # define COPY_PIXEL(to, from)    \
      do {                         \
          *(uint32_t *) to = from; \
          SKIP_PIXEL(to);          \
      } while (0)
  #else
  # error unknown bit depth
  #endif
  
  #ifdef HOST_WORDS_BIGENDIAN
  # define SWAP_WORDS	1
  #endif
  
  #define FN_2(x)		FN(x + 1) FN(x)
  #define FN_4(x)		FN_2(x + 2) FN_2(x)
  
  static void glue(pxa2xx_draw_line2_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t *palette = opaque;
      uint32_t data;
      while (width > 0) {
          data = *(uint32_t *) src;
  #define FN(x)		COPY_PIXEL(dest, palette[(data >> ((x) * 2)) & 3]);
  #ifdef SWAP_WORDS
          FN_4(12)
          FN_4(8)
          FN_4(4)
          FN_4(0)
  #else
          FN_4(0)
          FN_4(4)
          FN_4(8)
          FN_4(12)
  #endif
  #undef FN
          width -= 16;
          src += 4;
      }
  }
  
  static void glue(pxa2xx_draw_line4_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t *palette = opaque;
      uint32_t data;
      while (width > 0) {
          data = *(uint32_t *) src;
  #define FN(x)		COPY_PIXEL(dest, palette[(data >> ((x) * 4)) & 0xf]);
  #ifdef SWAP_WORDS
          FN_2(6)
          FN_2(4)
          FN_2(2)
          FN_2(0)
  #else
          FN_2(0)
          FN_2(2)
          FN_2(4)
          FN_2(6)
  #endif
  #undef FN
          width -= 8;
          src += 4;
      }
  }
  
  static void glue(pxa2xx_draw_line8_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t *palette = opaque;
      uint32_t data;
      while (width > 0) {
          data = *(uint32_t *) src;
  #define FN(x)		COPY_PIXEL(dest, palette[(data >> (x)) & 0xff]);
  #ifdef SWAP_WORDS
          FN(24)
          FN(16)
          FN(8)
          FN(0)
  #else
          FN(0)
          FN(8)
          FN(16)
          FN(24)
  #endif
  #undef FN
          width -= 4;
          src += 4;
      }
  }
  
  static void glue(pxa2xx_draw_line16_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data;
      unsigned int r, g, b;
      while (width > 0) {
          data = *(uint32_t *) src;
  #ifdef SWAP_WORDS
          data = bswap32(data);
  #endif
          b = (data & 0x1f) << 3;
          data >>= 5;
          g = (data & 0x3f) << 2;
          data >>= 6;
          r = (data & 0x1f) << 3;
          data >>= 5;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          b = (data & 0x1f) << 3;
          data >>= 5;
          g = (data & 0x3f) << 2;
          data >>= 6;
          r = (data & 0x1f) << 3;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 2;
          src += 4;
      }
  }
  
  static void glue(pxa2xx_draw_line16t_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data;
      unsigned int r, g, b;
      while (width > 0) {
          data = *(uint32_t *) src;
  #ifdef SWAP_WORDS
          data = bswap32(data);
  #endif
          b = (data & 0x1f) << 3;
          data >>= 5;
          g = (data & 0x1f) << 3;
          data >>= 5;
          r = (data & 0x1f) << 3;
          data >>= 5;
          if (data & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          data >>= 1;
          b = (data & 0x1f) << 3;
          data >>= 5;
          g = (data & 0x1f) << 3;
          data >>= 5;
          r = (data & 0x1f) << 3;
          data >>= 5;
          if (data & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 2;
          src += 4;
      }
  }
  
  static void glue(pxa2xx_draw_line18_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data;
      unsigned int r, g, b;
      while (width > 0) {
          data = *(uint32_t *) src;
  #ifdef SWAP_WORDS
          data = bswap32(data);
  #endif
          b = (data & 0x3f) << 2;
          data >>= 6;
          g = (data & 0x3f) << 2;
          data >>= 6;
          r = (data & 0x3f) << 2;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 1;
          src += 4;
      }
  }
  
  /* The wicked packed format */
  static void glue(pxa2xx_draw_line18p_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data[3];
      unsigned int r, g, b;
      while (width > 0) {
          data[0] = *(uint32_t *) src;
          src += 4;
          data[1] = *(uint32_t *) src;
          src += 4;
          data[2] = *(uint32_t *) src;
          src += 4;
  #ifdef SWAP_WORDS
          data[0] = bswap32(data[0]);
          data[1] = bswap32(data[1]);
          data[2] = bswap32(data[2]);
  #endif
          b = (data[0] & 0x3f) << 2;
          data[0] >>= 6;
          g = (data[0] & 0x3f) << 2;
          data[0] >>= 6;
          r = (data[0] & 0x3f) << 2;
          data[0] >>= 12;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          b = (data[0] & 0x3f) << 2;
          data[0] >>= 6;
          g = ((data[1] & 0xf) << 4) | (data[0] << 2);
          data[1] >>= 4;
          r = (data[1] & 0x3f) << 2;
          data[1] >>= 12;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          b = (data[1] & 0x3f) << 2;
          data[1] >>= 6;
          g = (data[1] & 0x3f) << 2;
          data[1] >>= 6;
          r = ((data[2] & 0x3) << 6) | (data[1] << 2);
          data[2] >>= 8;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          b = (data[2] & 0x3f) << 2;
          data[2] >>= 6;
          g = (data[2] & 0x3f) << 2;
          data[2] >>= 6;
          r = data[2] << 2;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 4;
      }
  }
  
  static void glue(pxa2xx_draw_line19_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data;
      unsigned int r, g, b;
      while (width > 0) {
          data = *(uint32_t *) src;
  #ifdef SWAP_WORDS
          data = bswap32(data);
  #endif
          b = (data & 0x3f) << 2;
          data >>= 6;
          g = (data & 0x3f) << 2;
          data >>= 6;
          r = (data & 0x3f) << 2;
          data >>= 6;
          if (data & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 1;
          src += 4;
      }
  }
  
  /* The wicked packed format */
  static void glue(pxa2xx_draw_line19p_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data[3];
      unsigned int r, g, b;
      while (width > 0) {
          data[0] = *(uint32_t *) src;
          src += 4;
          data[1] = *(uint32_t *) src;
          src += 4;
          data[2] = *(uint32_t *) src;
          src += 4;
  # ifdef SWAP_WORDS
          data[0] = bswap32(data[0]);
          data[1] = bswap32(data[1]);
          data[2] = bswap32(data[2]);
  # endif
          b = (data[0] & 0x3f) << 2;
          data[0] >>= 6;
          g = (data[0] & 0x3f) << 2;
          data[0] >>= 6;
          r = (data[0] & 0x3f) << 2;
          data[0] >>= 6;
          if (data[0] & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          data[0] >>= 6;
          b = (data[0] & 0x3f) << 2;
          data[0] >>= 6;
          g = ((data[1] & 0xf) << 4) | (data[0] << 2);
          data[1] >>= 4;
          r = (data[1] & 0x3f) << 2;
          data[1] >>= 6;
          if (data[1] & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          data[1] >>= 6;
          b = (data[1] & 0x3f) << 2;
          data[1] >>= 6;
          g = (data[1] & 0x3f) << 2;
          data[1] >>= 6;
          r = ((data[2] & 0x3) << 6) | (data[1] << 2);
          data[2] >>= 2;
          if (data[2] & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          data[2] >>= 6;
          b = (data[2] & 0x3f) << 2;
          data[2] >>= 6;
          g = (data[2] & 0x3f) << 2;
          data[2] >>= 6;
          r = data[2] << 2;
          data[2] >>= 6;
          if (data[2] & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 4;
      }
  }
  
  static void glue(pxa2xx_draw_line24_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data;
      unsigned int r, g, b;
      while (width > 0) {
          data = *(uint32_t *) src;
  #ifdef SWAP_WORDS
          data = bswap32(data);
  #endif
          b = data & 0xff;
          data >>= 8;
          g = data & 0xff;
          data >>= 8;
          r = data & 0xff;
          COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 1;
          src += 4;
      }
  }
  
  static void glue(pxa2xx_draw_line24t_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data;
      unsigned int r, g, b;
      while (width > 0) {
          data = *(uint32_t *) src;
  #ifdef SWAP_WORDS
          data = bswap32(data);
  #endif
          b = (data & 0x7f) << 1;
          data >>= 7;
          g = data & 0xff;
          data >>= 8;
          r = data & 0xff;
          data >>= 8;
          if (data & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 1;
          src += 4;
      }
  }
  
  static void glue(pxa2xx_draw_line25_, BITS)(void *opaque,
                  uint8_t *dest, const uint8_t *src, int width, int deststep)
  {
      uint32_t data;
      unsigned int r, g, b;
      while (width > 0) {
          data = *(uint32_t *) src;
  #ifdef SWAP_WORDS
          data = bswap32(data);
  #endif
          b = data & 0xff;
          data >>= 8;
          g = data & 0xff;
          data >>= 8;
          r = data & 0xff;
          data >>= 8;
          if (data & 1)
              SKIP_PIXEL(dest);
          else
              COPY_PIXEL(dest, glue(rgb_to_pixel, BITS)(r, g, b));
          width -= 1;
          src += 4;
      }
  }
  
  /* Overlay planes disabled, no transparency */
  static drawfn glue(pxa2xx_draw_fn_, BITS)[16] =
  {
      [0 ... 0xf]       = NULL,
      [pxa_lcdc_2bpp]   = glue(pxa2xx_draw_line2_, BITS),
      [pxa_lcdc_4bpp]   = glue(pxa2xx_draw_line4_, BITS),
      [pxa_lcdc_8bpp]   = glue(pxa2xx_draw_line8_, BITS),
      [pxa_lcdc_16bpp]  = glue(pxa2xx_draw_line16_, BITS),
      [pxa_lcdc_18bpp]  = glue(pxa2xx_draw_line18_, BITS),
      [pxa_lcdc_18pbpp] = glue(pxa2xx_draw_line18p_, BITS),
      [pxa_lcdc_24bpp]  = glue(pxa2xx_draw_line24_, BITS),
  };
  
  /* Overlay planes enabled, transparency used */
  static drawfn glue(glue(pxa2xx_draw_fn_, BITS), t)[16] =
  {
      [0 ... 0xf]       = NULL,
      [pxa_lcdc_4bpp]   = glue(pxa2xx_draw_line4_, BITS),
      [pxa_lcdc_8bpp]   = glue(pxa2xx_draw_line8_, BITS),
      [pxa_lcdc_16bpp]  = glue(pxa2xx_draw_line16t_, BITS),
      [pxa_lcdc_19bpp]  = glue(pxa2xx_draw_line19_, BITS),
      [pxa_lcdc_19pbpp] = glue(pxa2xx_draw_line19p_, BITS),
      [pxa_lcdc_24bpp]  = glue(pxa2xx_draw_line24t_, BITS),
      [pxa_lcdc_25bpp]  = glue(pxa2xx_draw_line25_, BITS),
  };
  
  #undef BITS
  #undef COPY_PIXEL
  #undef SKIP_PIXEL
  
  #ifdef SWAP_WORDS
  # undef SWAP_WORDS
  #endif
  