text: /* -*- Mode: c; c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t; -*- */
  /*
   * Copyright © 2000 SuSE, Inc.
   * Copyright © 2007 Red Hat, Inc.
   *
   * Permission to use, copy, modify, distribute, and sell this software and its
   * documentation for any purpose is hereby granted without fee, provided that
   * the above copyright notice appear in all copies and that both that
   * copyright notice and this permission notice appear in supporting
   * documentation, and that the name of SuSE not be used in advertising or
   * publicity pertaining to distribution of the software without specific,
   * written prior permission.  SuSE makes no representations about the
   * suitability of this software for any purpose.  It is provided "as is"
   * without express or implied warranty.
   *
   * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
   * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   *
   * Author:  Keith Packard, SuSE, Inc.
   */
  
  #ifndef PIXMAN_FAST_PATH_H__
  #define PIXMAN_FAST_PATH_H__
  
  #include "pixman-private.h"
  
  #define PIXMAN_REPEAT_COVER -1
  
  /* Flags describing input parameters to fast path macro template.
   * Turning on some flag values may indicate that
   * "some property X is available so template can use this" or
   * "some property X should be handled by template".
   *
   * FLAG_HAVE_SOLID_MASK
   *  Input mask is solid so template should handle this.
   *
   * FLAG_HAVE_NON_SOLID_MASK
   *  Input mask is bits mask so template should handle this.
   *
   * FLAG_HAVE_SOLID_MASK and FLAG_HAVE_NON_SOLID_MASK are mutually
   * exclusive. (It's not allowed to turn both flags on)
   */
  #define FLAG_NONE				(0)
  #define FLAG_HAVE_SOLID_MASK			(1 <<   1)
  #define FLAG_HAVE_NON_SOLID_MASK		(1 <<   2)
  
  /* To avoid too short repeated scanline function calls, extend source
   * scanlines having width less than below constant value.
   */
  #define REPEAT_NORMAL_MIN_WIDTH			64
  
  static force_inline pixman_bool_t
  repeat (pixman_repeat_t repeat, int *c, int size)
  {
      if (repeat == PIXMAN_REPEAT_NONE)
      {
  	if (*c < 0 || *c >= size)
  	    return FALSE;
      }
      else if (repeat == PIXMAN_REPEAT_NORMAL)
      {
  	while (*c >= size)
  	    *c -= size;
  	while (*c < 0)
  	    *c += size;
      }
      else if (repeat == PIXMAN_REPEAT_PAD)
      {
  	*c = CLIP (*c, 0, size - 1);
      }
      else /* REFLECT */
      {
  	*c = MOD (*c, size * 2);
  	if (*c >= size)
  	    *c = size * 2 - *c - 1;
      }
      return TRUE;
  }
  
  #if SIZEOF_LONG > 4
  
  static force_inline uint32_t
  bilinear_interpolation (uint32_t tl, uint32_t tr,
  			uint32_t bl, uint32_t br,
  			int distx, int disty)
  {
      uint64_t distxy, distxiy, distixy, distixiy;
      uint64_t tl64, tr64, bl64, br64;
      uint64_t f, r;
  
      distxy = distx * disty;
      distxiy = distx * (256 - disty);
      distixy = (256 - distx) * disty;
      distixiy = (256 - distx) * (256 - disty);
  
      /* Alpha and Blue */
      tl64 = tl & 0xff0000ff;
      tr64 = tr & 0xff0000ff;
      bl64 = bl & 0xff0000ff;
      br64 = br & 0xff0000ff;
  
      f = tl64 * distixiy + tr64 * distxiy + bl64 * distixy + br64 * distxy;
      r = f & 0x0000ff0000ff0000ull;
  
      /* Red and Green */
      tl64 = tl;
      tl64 = ((tl64 << 16) & 0x000000ff00000000ull) | (tl64 & 0x0000ff00ull);
  
      tr64 = tr;
      tr64 = ((tr64 << 16) & 0x000000ff00000000ull) | (tr64 & 0x0000ff00ull);
  
      bl64 = bl;
      bl64 = ((bl64 << 16) & 0x000000ff00000000ull) | (bl64 & 0x0000ff00ull);
  
      br64 = br;
      br64 = ((br64 << 16) & 0x000000ff00000000ull) | (br64 & 0x0000ff00ull);
  
      f = tl64 * distixiy + tr64 * distxiy + bl64 * distixy + br64 * distxy;
      r |= ((f >> 16) & 0x000000ff00000000ull) | (f & 0xff000000ull);
  
      return (uint32_t)(r >> 16);
  }
  
  #else
  
  static force_inline uint32_t
  bilinear_interpolation (uint32_t tl, uint32_t tr,
  			uint32_t bl, uint32_t br,
  			int distx, int disty)
  {
      int distxy, distxiy, distixy, distixiy;
      uint32_t f, r;
  
      distxy = distx * disty;
      distxiy = (distx << 8) - distxy;	/* distx * (256 - disty) */
      distixy = (disty << 8) - distxy;	/* disty * (256 - distx) */
      distixiy =
  	256 * 256 - (disty << 8) -
  	(distx << 8) + distxy;		/* (256 - distx) * (256 - disty) */
  
      /* Blue */
      r = (tl & 0x000000ff) * distixiy + (tr & 0x000000ff) * distxiy
        + (bl & 0x000000ff) * distixy  + (br & 0x000000ff) * distxy;
  
      /* Green */
      f = (tl & 0x0000ff00) * distixiy + (tr & 0x0000ff00) * distxiy
        + (bl & 0x0000ff00) * distixy  + (br & 0x0000ff00) * distxy;
      r |= f & 0xff000000;
  
      tl >>= 16;
      tr >>= 16;
      bl >>= 16;
      br >>= 16;
      r >>= 16;
  
      /* Red */
      f = (tl & 0x000000ff) * distixiy + (tr & 0x000000ff) * distxiy
        + (bl & 0x000000ff) * distixy  + (br & 0x000000ff) * distxy;
      r |= f & 0x00ff0000;
  
      /* Alpha */
      f = (tl & 0x0000ff00) * distixiy + (tr & 0x0000ff00) * distxiy
        + (bl & 0x0000ff00) * distixy  + (br & 0x0000ff00) * distxy;
      r |= f & 0xff000000;
  
      return r;
  }
  
  #endif
  
  /*
   * For each scanline fetched from source image with PAD repeat:
   * - calculate how many pixels need to be padded on the left side
   * - calculate how many pixels need to be padded on the right side
   * - update width to only count pixels which are fetched from the image
   * All this information is returned via 'width', 'left_pad', 'right_pad'
   * arguments. The code is assuming that 'unit_x' is positive.
   *
   * Note: 64-bit math is used in order to avoid potential overflows, which
   *       is probably excessive in many cases. This particular function
   *       may need its own correctness test and performance tuning.
   */
  static force_inline void
  pad_repeat_get_scanline_bounds (int32_t         source_image_width,
  				pixman_fixed_t  vx,
  				pixman_fixed_t  unit_x,
  				int32_t *       width,
  				int32_t *       left_pad,
  				int32_t *       right_pad)
  {
      int64_t max_vx = (int64_t) source_image_width << 16;
      int64_t tmp;
      if (vx < 0)
      {
  	tmp = ((int64_t) unit_x - 1 - vx) / unit_x;
  	if (tmp > *width)
  	{
  	    *left_pad = *width;
  	    *width = 0;
  	}
  	else
  	{
  	    *left_pad = (int32_t) tmp;
  	    *width -= (int32_t) tmp;
  	}
      }
      else
      {
  	*left_pad = 0;
      }
      tmp = ((int64_t) unit_x - 1 - vx + max_vx) / unit_x - *left_pad;
      if (tmp < 0)
      {
  	*right_pad = *width;
  	*width = 0;
      }
      else if (tmp >= *width)
      {
  	*right_pad = 0;
      }
      else
      {
  	*right_pad = *width - (int32_t) tmp;
  	*width = (int32_t) tmp;
      }
  }
  
  /* A macroified version of specialized nearest scalers for some
   * common 8888 and 565 formats. It supports SRC and OVER ops.
   *
   * There are two repeat versions, one that handles repeat normal,
   * and one without repeat handling that only works if the src region
   * used is completely covered by the pre-repeated source samples.
   *
   * The loops are unrolled to process two pixels per iteration for better
   * performance on most CPU architectures (superscalar processors
   * can issue several operations simultaneously, other processors can hide
   * instructions latencies by pipelining operations). Unrolling more
   * does not make much sense because the compiler will start running out
   * of spare registers soon.
   */
  
  #define GET_8888_ALPHA(s) ((s) >> 24)
   /* This is not actually used since we don't have an OVER with
      565 source, but it is needed to build. */
  #define GET_0565_ALPHA(s) 0xff
  #define GET_x888_ALPHA(s) 0xff
  
  #define FAST_NEAREST_SCANLINE(scanline_func_name, SRC_FORMAT, DST_FORMAT,			\
  			      src_type_t, dst_type_t, OP, repeat_mode)				\
  static force_inline void									\
  scanline_func_name (dst_type_t       *dst,							\
  		    const src_type_t *src,							\
  		    int32_t           w,							\
  		    pixman_fixed_t    vx,							\
  		    pixman_fixed_t    unit_x,							\
  		    pixman_fixed_t    max_vx,							\
  		    pixman_bool_t     fully_transparent_src)					\
  {												\
  	uint32_t   d;										\
  	src_type_t s1, s2;									\
  	uint8_t    a1, a2;									\
  	int        x1, x2;									\
  												\
  	if (PIXMAN_OP_ ## OP == PIXMAN_OP_OVER && fully_transparent_src)			\
  	    return;										\
  												\
  	if (PIXMAN_OP_ ## OP != PIXMAN_OP_SRC && PIXMAN_OP_ ## OP != PIXMAN_OP_OVER)		\
  	    abort();										\
  												\
  	while ((w -= 2) >= 0)									\
  	{											\
  	    x1 = vx >> 16;									\
  	    vx += unit_x;									\
  	    if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NORMAL)				\
  	    {											\
  		/* This works because we know that unit_x is positive */			\
  		while (vx >= max_vx)								\
  		    vx -= max_vx;								\
  	    }											\
  	    s1 = src[x1];									\
  												\
  	    x2 = vx >> 16;									\
  	    vx += unit_x;									\
  	    if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NORMAL)				\
  	    {											\
  		/* This works because we know that unit_x is positive */			\
  		while (vx >= max_vx)								\
  		    vx -= max_vx;								\
  	    }											\
  	    s2 = src[x2];									\
  												\
  	    if (PIXMAN_OP_ ## OP == PIXMAN_OP_OVER)						\
  	    {											\
  		a1 = GET_ ## SRC_FORMAT ## _ALPHA(s1);						\
  		a2 = GET_ ## SRC_FORMAT ## _ALPHA(s2);						\
  												\
  		if (a1 == 0xff)									\
  		{										\
  		    *dst = CONVERT_ ## SRC_FORMAT ## _TO_ ## DST_FORMAT (s1);			\
  		}										\
  		else if (s1)									\
  		{										\
  		    d = CONVERT_ ## DST_FORMAT ## _TO_8888 (*dst);				\
  		    s1 = CONVERT_ ## SRC_FORMAT ## _TO_8888 (s1);				\
  		    a1 ^= 0xff;									\
  		    UN8x4_MUL_UN8_ADD_UN8x4 (d, a1, s1);					\
  		    *dst = CONVERT_8888_TO_ ## DST_FORMAT (d);					\
  		}										\
  		dst++;										\
  												\
  		if (a2 == 0xff)									\
  		{										\
  		    *dst = CONVERT_ ## SRC_FORMAT ## _TO_ ## DST_FORMAT (s2);			\
  		}										\
  		else if (s2)									\
  		{										\
  		    d = CONVERT_## DST_FORMAT ## _TO_8888 (*dst);				\
  		    s2 = CONVERT_## SRC_FORMAT ## _TO_8888 (s2);				\
  		    a2 ^= 0xff;									\
  		    UN8x4_MUL_UN8_ADD_UN8x4 (d, a2, s2);					\
  		    *dst = CONVERT_8888_TO_ ## DST_FORMAT (d);					\
  		}										\
  		dst++;										\
  	    }											\
  	    else /* PIXMAN_OP_SRC */								\
  	    {											\
  		*dst++ = CONVERT_ ## SRC_FORMAT ## _TO_ ## DST_FORMAT (s1);			\
  		*dst++ = CONVERT_ ## SRC_FORMAT ## _TO_ ## DST_FORMAT (s2);			\
  	    }											\
  	}											\
  												\
  	if (w & 1)										\
  	{											\
  	    x1 = vx >> 16;									\
  	    s1 = src[x1];									\
  												\
  	    if (PIXMAN_OP_ ## OP == PIXMAN_OP_OVER)						\
  	    {											\
  		a1 = GET_ ## SRC_FORMAT ## _ALPHA(s1);						\
  												\
  		if (a1 == 0xff)									\
  		{										\
  		    *dst = CONVERT_ ## SRC_FORMAT ## _TO_ ## DST_FORMAT (s1);			\
  		}										\
  		else if (s1)									\
  		{										\
  		    d = CONVERT_## DST_FORMAT ## _TO_8888 (*dst);				\
  		    s1 = CONVERT_ ## SRC_FORMAT ## _TO_8888 (s1);				\
  		    a1 ^= 0xff;									\
  		    UN8x4_MUL_UN8_ADD_UN8x4 (d, a1, s1);					\
  		    *dst = CONVERT_8888_TO_ ## DST_FORMAT (d);					\
  		}										\
  		dst++;										\
  	    }											\
  	    else /* PIXMAN_OP_SRC */								\
  	    {											\
  		*dst++ = CONVERT_ ## SRC_FORMAT ## _TO_ ## DST_FORMAT (s1);			\
  	    }											\
  	}											\
  }
  
  #define FAST_NEAREST_MAINLOOP_INT(scale_func_name, scanline_func, src_type_t, mask_type_t,	\
  				  dst_type_t, repeat_mode, have_mask, mask_is_solid)		\
  static void											\
  fast_composite_scaled_nearest  ## scale_func_name (pixman_implementation_t *imp,		\
  						   pixman_composite_info_t *info)               \
  {												\
      PIXMAN_COMPOSITE_ARGS (info);					                        \
      dst_type_t *dst_line;						                        \
      mask_type_t *mask_line;									\
      src_type_t *src_first_line;									\
      int       y;										\
      pixman_fixed_t max_vx = INT32_MAX; /* suppress uninitialized variable warning */		\
      pixman_fixed_t max_vy;									\
      pixman_vector_t v;										\
      pixman_fixed_t vx, vy;									\
      pixman_fixed_t unit_x, unit_y;								\
      int32_t left_pad, right_pad;								\
  												\
      src_type_t *src;										\
      dst_type_t *dst;										\
      mask_type_t solid_mask;									\
      const mask_type_t *mask = &solid_mask;							\
      int src_stride, mask_stride, dst_stride;							\
  												\
      PIXMAN_IMAGE_GET_LINE (dest_image, dest_x, dest_y, dst_type_t, dst_stride, dst_line, 1);	\
      if (have_mask)										\
      {												\
  	if (mask_is_solid)									\
  	    solid_mask = _pixman_image_get_solid (imp, mask_image, dest_image->bits.format);	\
  	else											\
  	    PIXMAN_IMAGE_GET_LINE (mask_image, mask_x, mask_y, mask_type_t,			\
  				   mask_stride, mask_line, 1);					\
      }												\
      /* pass in 0 instead of src_x and src_y because src_x and src_y need to be			\
       * transformed from destination space to source space */					\
      PIXMAN_IMAGE_GET_LINE (src_image, 0, 0, src_type_t, src_stride, src_first_line, 1);		\
  												\
      /* reference point is the center of the pixel */						\
      v.vector[0] = pixman_int_to_fixed (src_x) + pixman_fixed_1 / 2;				\
      v.vector[1] = pixman_int_to_fixed (src_y) + pixman_fixed_1 / 2;				\
      v.vector[2] = pixman_fixed_1;								\
  												\
      if (!pixman_transform_point_3d (src_image->common.transform, &v))				\
  	return;											\
  												\
      unit_x = src_image->common.transform->matrix[0][0];						\
      unit_y = src_image->common.transform->matrix[1][1];						\
  												\
      /* Round down to closest integer, ensuring that 0.5 rounds to 0, not 1 */			\
      v.vector[0] -= pixman_fixed_e;								\
      v.vector[1] -= pixman_fixed_e;								\
  												\
      vx = v.vector[0];										\
      vy = v.vector[1];										\
  												\
      if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NORMAL)					\
      {												\
  	/* Clamp repeating positions inside the actual samples */				\
  	max_vx = src_image->bits.width << 16;							\
  	max_vy = src_image->bits.height << 16;							\
  												\
  	repeat (PIXMAN_REPEAT_NORMAL, &vx, max_vx);						\
  	repeat (PIXMAN_REPEAT_NORMAL, &vy, max_vy);						\
      }												\
  												\
      if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_PAD ||					\
  	PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NONE)					\
      {												\
  	pad_repeat_get_scanline_bounds (src_image->bits.width, vx, unit_x,			\
  					&width, &left_pad, &right_pad);				\
  	vx += left_pad * unit_x;								\
      }												\
  												\
      while (--height >= 0)									\
      {												\
  	dst = dst_line;										\
  	dst_line += dst_stride;									\
  	if (have_mask && !mask_is_solid)							\
  	{											\
  	    mask = mask_line;									\
  	    mask_line += mask_stride;								\
  	}											\
  												\
  	y = vy >> 16;										\
  	vy += unit_y;										\
  	if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NORMAL)				\
  	    repeat (PIXMAN_REPEAT_NORMAL, &vy, max_vy);						\
  	if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_PAD)					\
  	{											\
  	    repeat (PIXMAN_REPEAT_PAD, &y, src_image->bits.height);				\
  	    src = src_first_line + src_stride * y;						\
  	    if (left_pad > 0)									\
  	    {											\
  		scanline_func (mask, dst, src, left_pad, 0, 0, 0, FALSE);			\
  	    }											\
  	    if (width > 0)									\
  	    {											\
  		scanline_func (mask + (mask_is_solid ? 0 : left_pad),				\
  			       dst + left_pad, src, width, vx, unit_x, 0, FALSE);		\
  	    }											\
  	    if (right_pad > 0)									\
  	    {											\
  		scanline_func (mask + (mask_is_solid ? 0 : left_pad + width),			\
  			       dst + left_pad + width, src + src_image->bits.width - 1,		\
  			       right_pad, 0, 0, 0, FALSE);					\
  	    }											\
  	}											\
  	else if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NONE)				\
  	{											\
  	    static const src_type_t zero[1] = { 0 };						\
  	    if (y < 0 || y >= src_image->bits.height)						\
  	    {											\
  		scanline_func (mask, dst, zero, left_pad + width + right_pad, 0, 0, 0, TRUE);	\
  		continue;									\
  	    }											\
  	    src = src_first_line + src_stride * y;						\
  	    if (left_pad > 0)									\
  	    {											\
  		scanline_func (mask, dst, zero, left_pad, 0, 0, 0, TRUE);			\
  	    }											\
  	    if (width > 0)									\
  	    {											\
  		scanline_func (mask + (mask_is_solid ? 0 : left_pad),				\
  			       dst + left_pad, src, width, vx, unit_x, 0, FALSE);		\
  	    }											\
  	    if (right_pad > 0)									\
  	    {											\
  		scanline_func (mask + (mask_is_solid ? 0 : left_pad + width),			\
  			       dst + left_pad + width, zero, right_pad, 0, 0, 0, TRUE);		\
  	    }											\
  	}											\
  	else											\
  	{											\
  	    src = src_first_line + src_stride * y;						\
  	    scanline_func (mask, dst, src, width, vx, unit_x, max_vx, FALSE);			\
  	}											\
      }												\
  }
  
  /* A workaround for old sun studio, see: https://bugs.freedesktop.org/show_bug.cgi?id=32764 */
  #define FAST_NEAREST_MAINLOOP_COMMON(scale_func_name, scanline_func, src_type_t, mask_type_t,	\
  				  dst_type_t, repeat_mode, have_mask, mask_is_solid)		\
  	FAST_NEAREST_MAINLOOP_INT(_ ## scale_func_name, scanline_func, src_type_t, mask_type_t,	\
  				  dst_type_t, repeat_mode, have_mask, mask_is_solid)
  
  #define FAST_NEAREST_MAINLOOP_NOMASK(scale_func_name, scanline_func, src_type_t, dst_type_t,	\
  			      repeat_mode)							\
      static force_inline void									\
      scanline_func##scale_func_name##_wrapper (							\
  		    const uint8_t    *mask,							\
  		    dst_type_t       *dst,							\
  		    const src_type_t *src,							\
  		    int32_t          w,								\
  		    pixman_fixed_t   vx,							\
  		    pixman_fixed_t   unit_x,							\
  		    pixman_fixed_t   max_vx,							\
  		    pixman_bool_t    fully_transparent_src)					\
      {												\
  	scanline_func (dst, src, w, vx, unit_x, max_vx, fully_transparent_src);			\
      }												\
      FAST_NEAREST_MAINLOOP_INT (scale_func_name, scanline_func##scale_func_name##_wrapper,	\
  			       src_type_t, uint8_t, dst_type_t, repeat_mode, FALSE, FALSE)
  
  #define FAST_NEAREST_MAINLOOP(scale_func_name, scanline_func, src_type_t, dst_type_t,		\
  			      repeat_mode)							\
  	FAST_NEAREST_MAINLOOP_NOMASK(_ ## scale_func_name, scanline_func, src_type_t,		\
  			      dst_type_t, repeat_mode)
  
  #define FAST_NEAREST(scale_func_name, SRC_FORMAT, DST_FORMAT,				\
  		     src_type_t, dst_type_t, OP, repeat_mode)				\
      FAST_NEAREST_SCANLINE(scaled_nearest_scanline_ ## scale_func_name ## _ ## OP,	\
  			  SRC_FORMAT, DST_FORMAT, src_type_t, dst_type_t,		\
  			  OP, repeat_mode)						\
      FAST_NEAREST_MAINLOOP_NOMASK(_ ## scale_func_name ## _ ## OP,			\
  			  scaled_nearest_scanline_ ## scale_func_name ## _ ## OP,	\
  			  src_type_t, dst_type_t, repeat_mode)
  
  
  #define SCALED_NEAREST_FLAGS						\
      (FAST_PATH_SCALE_TRANSFORM	|					\
       FAST_PATH_NO_ALPHA_MAP	|					\
       FAST_PATH_NEAREST_FILTER	|					\
       FAST_PATH_NO_ACCESSORS	|					\
       FAST_PATH_NARROW_FORMAT)
  
  #define SIMPLE_NEAREST_FAST_PATH_NORMAL(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_NORMAL_REPEAT	|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _normal ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_FAST_PATH_PAD(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_PAD_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _pad ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_FAST_PATH_NONE(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_NONE_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _none ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_FAST_PATH_COVER(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	SCALED_NEAREST_FLAGS | FAST_PATH_SAMPLES_COVER_CLIP_NEAREST,    \
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _cover ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_A8_MASK_FAST_PATH_NORMAL(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_NORMAL_REPEAT	|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _normal ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_A8_MASK_FAST_PATH_PAD(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_PAD_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _pad ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_A8_MASK_FAST_PATH_NONE(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_NONE_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _none ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_A8_MASK_FAST_PATH_COVER(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	SCALED_NEAREST_FLAGS | FAST_PATH_SAMPLES_COVER_CLIP_NEAREST,	\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _cover ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_SOLID_MASK_FAST_PATH_NORMAL(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_NORMAL_REPEAT	|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _normal ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_SOLID_MASK_FAST_PATH_PAD(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_PAD_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _pad ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_SOLID_MASK_FAST_PATH_NONE(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_NEAREST_FLAGS		|				\
  	 FAST_PATH_NONE_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _none ## _ ## op,	\
      }
  
  #define SIMPLE_NEAREST_SOLID_MASK_FAST_PATH_COVER(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	SCALED_NEAREST_FLAGS | FAST_PATH_SAMPLES_COVER_CLIP_NEAREST,	\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_nearest_ ## func ## _cover ## _ ## op,	\
      }
  
  /* Prefer the use of 'cover' variant, because it is faster */
  #define SIMPLE_NEAREST_FAST_PATH(op,s,d,func)				\
      SIMPLE_NEAREST_FAST_PATH_COVER (op,s,d,func),			\
      SIMPLE_NEAREST_FAST_PATH_NONE (op,s,d,func),			\
      SIMPLE_NEAREST_FAST_PATH_PAD (op,s,d,func),				\
      SIMPLE_NEAREST_FAST_PATH_NORMAL (op,s,d,func)
  
  #define SIMPLE_NEAREST_A8_MASK_FAST_PATH(op,s,d,func)			\
      SIMPLE_NEAREST_A8_MASK_FAST_PATH_COVER (op,s,d,func),		\
      SIMPLE_NEAREST_A8_MASK_FAST_PATH_NONE (op,s,d,func),		\
      SIMPLE_NEAREST_A8_MASK_FAST_PATH_PAD (op,s,d,func)
  
  #define SIMPLE_NEAREST_SOLID_MASK_FAST_PATH(op,s,d,func)		\
      SIMPLE_NEAREST_SOLID_MASK_FAST_PATH_COVER (op,s,d,func),		\
      SIMPLE_NEAREST_SOLID_MASK_FAST_PATH_NONE (op,s,d,func),		\
      SIMPLE_NEAREST_SOLID_MASK_FAST_PATH_PAD (op,s,d,func)
  
  /*****************************************************************************/
  
  /*
   * Identify 5 zones in each scanline for bilinear scaling. Depending on
   * whether 2 pixels to be interpolated are fetched from the image itself,
   * from the padding area around it or from both image and padding area.
   */
  static force_inline void
  bilinear_pad_repeat_get_scanline_bounds (int32_t         source_image_width,
  					 pixman_fixed_t  vx,
  					 pixman_fixed_t  unit_x,
  					 int32_t *       left_pad,
  					 int32_t *       left_tz,
  					 int32_t *       width,
  					 int32_t *       right_tz,
  					 int32_t *       right_pad)
  {
  	int width1 = *width, left_pad1, right_pad1;
  	int width2 = *width, left_pad2, right_pad2;
  
  	pad_repeat_get_scanline_bounds (source_image_width, vx, unit_x,
  					&width1, &left_pad1, &right_pad1);
  	pad_repeat_get_scanline_bounds (source_image_width, vx + pixman_fixed_1,
  					unit_x, &width2, &left_pad2, &right_pad2);
  
  	*left_pad = left_pad2;
  	*left_tz = left_pad1 - left_pad2;
  	*right_tz = right_pad2 - right_pad1;
  	*right_pad = right_pad1;
  	*width -= *left_pad + *left_tz + *right_tz + *right_pad;
  }
  
  /*
   * Main loop template for single pass bilinear scaling. It needs to be
   * provided with 'scanline_func' which should do the compositing operation.
   * The needed function has the following prototype:
   *
   *	scanline_func (dst_type_t *       dst,
   *		       const mask_type_ * mask,
   *		       const src_type_t * src_top,
   *		       const src_type_t * src_bottom,
   *		       int32_t            width,
   *		       int                weight_top,
   *		       int                weight_bottom,
   *		       pixman_fixed_t     vx,
   *		       pixman_fixed_t     unit_x,
   *		       pixman_fixed_t     max_vx,
   *		       pixman_bool_t      zero_src)
   *
   * Where:
   *  dst                 - destination scanline buffer for storing results
   *  mask                - mask buffer (or single value for solid mask)
   *  src_top, src_bottom - two source scanlines
   *  width               - number of pixels to process
   *  weight_top          - weight of the top row for interpolation
   *  weight_bottom       - weight of the bottom row for interpolation
   *  vx                  - initial position for fetching the first pair of
   *                        pixels from the source buffer
   *  unit_x              - position increment needed to move to the next pair
   *                        of pixels
   *  max_vx              - image size as a fixed point value, can be used for
   *                        implementing NORMAL repeat (when it is supported)
   *  zero_src            - boolean hint variable, which is set to TRUE when
   *                        all source pixels are fetched from zero padding
   *                        zone for NONE repeat
   *
   * Note: normally the sum of 'weight_top' and 'weight_bottom' is equal to 256,
   *       but sometimes it may be less than that for NONE repeat when handling
   *       fuzzy antialiased top or bottom image edges. Also both top and
   *       bottom weight variables are guaranteed to have value in 0-255
   *       range and can fit into unsigned byte or be used with 8-bit SIMD
   *       multiplication instructions.
   */
  #define FAST_BILINEAR_MAINLOOP_INT(scale_func_name, scanline_func, src_type_t, mask_type_t,	\
  				  dst_type_t, repeat_mode, flags)				\
  static void											\
  fast_composite_scaled_bilinear ## scale_func_name (pixman_implementation_t *imp,		\
  						   pixman_composite_info_t *info)		\
  {												\
      PIXMAN_COMPOSITE_ARGS (info);								\
      dst_type_t *dst_line;									\
      mask_type_t *mask_line;									\
      src_type_t *src_first_line;									\
      int       y1, y2;										\
      pixman_fixed_t max_vx = INT32_MAX; /* suppress uninitialized variable warning */		\
      pixman_vector_t v;										\
      pixman_fixed_t vx, vy;									\
      pixman_fixed_t unit_x, unit_y;								\
      int32_t left_pad, left_tz, right_tz, right_pad;						\
  												\
      dst_type_t *dst;										\
      mask_type_t solid_mask;									\
      const mask_type_t *mask = &solid_mask;							\
      int src_stride, mask_stride, dst_stride;							\
  												\
      int src_width;										\
      pixman_fixed_t src_width_fixed;								\
      int max_x;											\
      pixman_bool_t need_src_extension;								\
  												\
      PIXMAN_IMAGE_GET_LINE (dest_image, dest_x, dest_y, dst_type_t, dst_stride, dst_line, 1);	\
      if (flags & FLAG_HAVE_SOLID_MASK)								\
      {												\
  	solid_mask = _pixman_image_get_solid (imp, mask_image, dest_image->bits.format);	\
  	mask_stride = 0;									\
      }												\
      else if (flags & FLAG_HAVE_NON_SOLID_MASK)							\
      {												\
  	PIXMAN_IMAGE_GET_LINE (mask_image, mask_x, mask_y, mask_type_t,				\
  			       mask_stride, mask_line, 1);					\
      }												\
  												\
      /* pass in 0 instead of src_x and src_y because src_x and src_y need to be			\
       * transformed from destination space to source space */					\
      PIXMAN_IMAGE_GET_LINE (src_image, 0, 0, src_type_t, src_stride, src_first_line, 1);		\
  												\
      /* reference point is the center of the pixel */						\
      v.vector[0] = pixman_int_to_fixed (src_x) + pixman_fixed_1 / 2;				\
      v.vector[1] = pixman_int_to_fixed (src_y) + pixman_fixed_1 / 2;				\
      v.vector[2] = pixman_fixed_1;								\
  												\
      if (!pixman_transform_point_3d (src_image->common.transform, &v))				\
  	return;											\
  												\
      unit_x = src_image->common.transform->matrix[0][0];						\
      unit_y = src_image->common.transform->matrix[1][1];						\
  												\
      v.vector[0] -= pixman_fixed_1 / 2;								\
      v.vector[1] -= pixman_fixed_1 / 2;								\
  												\
      vy = v.vector[1];										\
  												\
      if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_PAD ||					\
  	PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NONE)					\
      {												\
  	bilinear_pad_repeat_get_scanline_bounds (src_image->bits.width, v.vector[0], unit_x,	\
  					&left_pad, &left_tz, &width, &right_tz, &right_pad);	\
  	if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_PAD)					\
  	{											\
  	    /* PAD repeat does not need special handling for 'transition zones' and */		\
  	    /* they can be combined with 'padding zones' safely */				\
  	    left_pad += left_tz;								\
  	    right_pad += right_tz;								\
  	    left_tz = right_tz = 0;								\
  	}											\
  	v.vector[0] += left_pad * unit_x;							\
      }												\
  												\
      if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NORMAL)					\
      {												\
  	vx = v.vector[0];									\
  	repeat (PIXMAN_REPEAT_NORMAL, &vx, pixman_int_to_fixed(src_image->bits.width));		\
  	max_x = pixman_fixed_to_int (vx + (width - 1) * unit_x) + 1;				\
  												\
  	if (src_image->bits.width < REPEAT_NORMAL_MIN_WIDTH)					\
  	{											\
  	    src_width = 0;									\
  												\
  	    while (src_width < REPEAT_NORMAL_MIN_WIDTH && src_width <= max_x)			\
  		src_width += src_image->bits.width;						\
  												\
  	    need_src_extension = TRUE;								\
  	}											\
  	else											\
  	{											\
  	    src_width = src_image->bits.width;							\
  	    need_src_extension = FALSE;								\
  	}											\
  												\
  	src_width_fixed = pixman_int_to_fixed (src_width);					\
      }												\
  												\
      while (--height >= 0)									\
      {												\
  	int weight1, weight2;									\
  	dst = dst_line;										\
  	dst_line += dst_stride;									\
  	vx = v.vector[0];									\
  	if (flags & FLAG_HAVE_NON_SOLID_MASK)							\
  	{											\
  	    mask = mask_line;									\
  	    mask_line += mask_stride;								\
  	}											\
  												\
  	y1 = pixman_fixed_to_int (vy);								\
  	weight2 = (vy >> 8) & 0xff;								\
  	if (weight2)										\
  	{											\
  	    /* normal case, both row weights are in 0-255 range and fit unsigned byte */	\
  	    y2 = y1 + 1;									\
  	    weight1 = 256 - weight2;								\
  	}											\
  	else											\
  	{											\
  	    /* set both top and bottom row to the same scanline, and weights to 128+128 */	\
  	    y2 = y1;										\
  	    weight1 = weight2 = 128;								\
  	}											\
  	vy += unit_y;										\
  	if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_PAD)					\
  	{											\
  	    src_type_t *src1, *src2;								\
  	    src_type_t buf1[2];									\
  	    src_type_t buf2[2];									\
  	    repeat (PIXMAN_REPEAT_PAD, &y1, src_image->bits.height);				\
  	    repeat (PIXMAN_REPEAT_PAD, &y2, src_image->bits.height);				\
  	    src1 = src_first_line + src_stride * y1;						\
  	    src2 = src_first_line + src_stride * y2;						\
  												\
  	    if (left_pad > 0)									\
  	    {											\
  		buf1[0] = buf1[1] = src1[0];							\
  		buf2[0] = buf2[1] = src2[0];							\
  		scanline_func (dst, mask,							\
  			       buf1, buf2, left_pad, weight1, weight2, 0, 0, 0, FALSE);		\
  		dst += left_pad;								\
  		if (flags & FLAG_HAVE_NON_SOLID_MASK)						\
  		    mask += left_pad;								\
  	    }											\
  	    if (width > 0)									\
  	    {											\
  		scanline_func (dst, mask,							\
  			       src1, src2, width, weight1, weight2, vx, unit_x, 0, FALSE);	\
  		dst += width;									\
  		if (flags & FLAG_HAVE_NON_SOLID_MASK)						\
  		    mask += width;								\
  	    }											\
  	    if (right_pad > 0)									\
  	    {											\
  		buf1[0] = buf1[1] = src1[src_image->bits.width - 1];				\
  		buf2[0] = buf2[1] = src2[src_image->bits.width - 1];				\
  		scanline_func (dst, mask,							\
  			       buf1, buf2, right_pad, weight1, weight2, 0, 0, 0, FALSE);	\
  	    }											\
  	}											\
  	else if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NONE)				\
  	{											\
  	    src_type_t *src1, *src2;								\
  	    src_type_t buf1[2];									\
  	    src_type_t buf2[2];									\
  	    /* handle top/bottom zero padding by just setting weights to 0 if needed */		\
  	    if (y1 < 0)										\
  	    {											\
  		weight1 = 0;									\
  		y1 = 0;										\
  	    }											\
  	    if (y1 >= src_image->bits.height)							\
  	    {											\
  		weight1 = 0;									\
  		y1 = src_image->bits.height - 1;						\
  	    }											\
  	    if (y2 < 0)										\
  	    {											\
  		weight2 = 0;									\
  		y2 = 0;										\
  	    }											\
  	    if (y2 >= src_image->bits.height)							\
  	    {											\
  		weight2 = 0;									\
  		y2 = src_image->bits.height - 1;						\
  	    }											\
  	    src1 = src_first_line + src_stride * y1;						\
  	    src2 = src_first_line + src_stride * y2;						\
  												\
  	    if (left_pad > 0)									\
  	    {											\
  		buf1[0] = buf1[1] = 0;								\
  		buf2[0] = buf2[1] = 0;								\
  		scanline_func (dst, mask,							\
  			       buf1, buf2, left_pad, weight1, weight2, 0, 0, 0, TRUE);		\
  		dst += left_pad;								\
  		if (flags & FLAG_HAVE_NON_SOLID_MASK)						\
  		    mask += left_pad;								\
  	    }											\
  	    if (left_tz > 0)									\
  	    {											\
  		buf1[0] = 0;									\
  		buf1[1] = src1[0];								\
  		buf2[0] = 0;									\
  		buf2[1] = src2[0];								\
  		scanline_func (dst, mask,							\
  			       buf1, buf2, left_tz, weight1, weight2,				\
  			       pixman_fixed_frac (vx), unit_x, 0, FALSE);			\
  		dst += left_tz;									\
  		if (flags & FLAG_HAVE_NON_SOLID_MASK)						\
  		    mask += left_tz;								\
  		vx += left_tz * unit_x;								\
  	    }											\
  	    if (width > 0)									\
  	    {											\
  		scanline_func (dst, mask,							\
  			       src1, src2, width, weight1, weight2, vx, unit_x, 0, FALSE);	\
  		dst += width;									\
  		if (flags & FLAG_HAVE_NON_SOLID_MASK)						\
  		    mask += width;								\
  		vx += width * unit_x;								\
  	    }											\
  	    if (right_tz > 0)									\
  	    {											\
  		buf1[0] = src1[src_image->bits.width - 1];					\
  		buf1[1] = 0;									\
  		buf2[0] = src2[src_image->bits.width - 1];					\
  		buf2[1] = 0;									\
  		scanline_func (dst, mask,							\
  			       buf1, buf2, right_tz, weight1, weight2,				\
  			       pixman_fixed_frac (vx), unit_x, 0, FALSE);			\
  		dst += right_tz;								\
  		if (flags & FLAG_HAVE_NON_SOLID_MASK)						\
  		    mask += right_tz;								\
  	    }											\
  	    if (right_pad > 0)									\
  	    {											\
  		buf1[0] = buf1[1] = 0;								\
  		buf2[0] = buf2[1] = 0;								\
  		scanline_func (dst, mask,							\
  			       buf1, buf2, right_pad, weight1, weight2, 0, 0, 0, TRUE);		\
  	    }											\
  	}											\
  	else if (PIXMAN_REPEAT_ ## repeat_mode == PIXMAN_REPEAT_NORMAL)				\
  	{											\
  	    int32_t	    num_pixels;								\
  	    int32_t	    width_remain;							\
  	    src_type_t *    src_line_top;							\
  	    src_type_t *    src_line_bottom;							\
  	    src_type_t	    buf1[2];								\
  	    src_type_t	    buf2[2];								\
  	    src_type_t	    extended_src_line0[REPEAT_NORMAL_MIN_WIDTH*2];			\
  	    src_type_t	    extended_src_line1[REPEAT_NORMAL_MIN_WIDTH*2];			\
  	    int		    i, j;								\
  												\
  	    repeat (PIXMAN_REPEAT_NORMAL, &y1, src_image->bits.height);				\
  	    repeat (PIXMAN_REPEAT_NORMAL, &y2, src_image->bits.height);				\
  	    src_line_top = src_first_line + src_stride * y1;					\
  	    src_line_bottom = src_first_line + src_stride * y2;					\
  												\
  	    if (need_src_extension)								\
  	    {											\
  		for (i=0; i<src_width;)								\
  		{										\
  		    for (j=0; j<src_image->bits.width; j++, i++)				\
  		    {										\
  			extended_src_line0[i] = src_line_top[j];				\
  			extended_src_line1[i] = src_line_bottom[j];				\
  		    }										\
  		}										\
  												\
  		src_line_top = &extended_src_line0[0];						\
  		src_line_bottom = &extended_src_line1[0];					\
  	    }											\
  												\
  	    /* Top & Bottom wrap around buffer */						\
  	    buf1[0] = src_line_top[src_width - 1];						\
  	    buf1[1] = src_line_top[0];								\
  	    buf2[0] = src_line_bottom[src_width - 1];						\
  	    buf2[1] = src_line_bottom[0];							\
  												\
  	    width_remain = width;								\
  												\
  	    while (width_remain > 0)								\
  	    {											\
  		/* We use src_width_fixed because it can make vx in original source range */	\
  		repeat (PIXMAN_REPEAT_NORMAL, &vx, src_width_fixed);				\
  												\
  		/* Wrap around part */								\
  		if (pixman_fixed_to_int (vx) == src_width - 1)					\
  		{										\
  		    /* for positive unit_x							\
  		     * num_pixels = max(n) + 1, where vx + n*unit_x < src_width_fixed		\
  		     *										\
  		     * vx is in range [0, src_width_fixed - pixman_fixed_e]			\
  		     * So we are safe from overflow.						\
  		     */										\
  		    num_pixels = ((src_width_fixed - vx - pixman_fixed_e) / unit_x) + 1;	\
  												\
  		    if (num_pixels > width_remain)						\
  			num_pixels = width_remain;						\
  												\
  		    scanline_func (dst, mask, buf1, buf2, num_pixels,				\
  				   weight1, weight2, pixman_fixed_frac(vx),			\
  				   unit_x, src_width_fixed, FALSE);				\
  												\
  		    width_remain -= num_pixels;							\
  		    vx += num_pixels * unit_x;							\
  		    dst += num_pixels;								\
  												\
  		    if (flags & FLAG_HAVE_NON_SOLID_MASK)					\
  			mask += num_pixels;							\
  												\
  		    repeat (PIXMAN_REPEAT_NORMAL, &vx, src_width_fixed);			\
  		}										\
  												\
  		/* Normal scanline composite */							\
  		if (pixman_fixed_to_int (vx) != src_width - 1 && width_remain > 0)		\
  		{										\
  		    /* for positive unit_x							\
  		     * num_pixels = max(n) + 1, where vx + n*unit_x < (src_width_fixed - 1)	\
  		     *										\
  		     * vx is in range [0, src_width_fixed - pixman_fixed_e]			\
  		     * So we are safe from overflow here.					\
  		     */										\
  		    num_pixels = ((src_width_fixed - pixman_fixed_1 - vx - pixman_fixed_e)	\
  				  / unit_x) + 1;						\
  												\
  		    if (num_pixels > width_remain)						\
  			num_pixels = width_remain;						\
  												\
  		    scanline_func (dst, mask, src_line_top, src_line_bottom, num_pixels,	\
  				   weight1, weight2, vx, unit_x, src_width_fixed, FALSE);	\
  												\
  		    width_remain -= num_pixels;							\
  		    vx += num_pixels * unit_x;							\
  		    dst += num_pixels;								\
  												\
  		    if (flags & FLAG_HAVE_NON_SOLID_MASK)					\
  		        mask += num_pixels;							\
  		}										\
  	    }											\
  	}											\
  	else											\
  	{											\
  	    scanline_func (dst, mask, src_first_line + src_stride * y1,				\
  			   src_first_line + src_stride * y2, width,				\
  			   weight1, weight2, vx, unit_x, max_vx, FALSE);			\
  	}											\
      }												\
  }
  
  /* A workaround for old sun studio, see: https://bugs.freedesktop.org/show_bug.cgi?id=32764 */
  #define FAST_BILINEAR_MAINLOOP_COMMON(scale_func_name, scanline_func, src_type_t, mask_type_t,	\
  				  dst_type_t, repeat_mode, flags)				\
  	FAST_BILINEAR_MAINLOOP_INT(_ ## scale_func_name, scanline_func, src_type_t, mask_type_t,\
  				  dst_type_t, repeat_mode, flags)
  
  #define SCALED_BILINEAR_FLAGS						\
      (FAST_PATH_SCALE_TRANSFORM	|					\
       FAST_PATH_NO_ALPHA_MAP	|					\
       FAST_PATH_BILINEAR_FILTER	|					\
       FAST_PATH_NO_ACCESSORS	|					\
       FAST_PATH_NARROW_FORMAT)
  
  #define SIMPLE_BILINEAR_FAST_PATH_PAD(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_PAD_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _pad ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_FAST_PATH_NONE(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_NONE_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _none ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_FAST_PATH_COVER(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	SCALED_BILINEAR_FLAGS | FAST_PATH_SAMPLES_COVER_CLIP_BILINEAR,	\
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _cover ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_FAST_PATH_NORMAL(op,s,d,func)			\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_NORMAL_REPEAT	|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_null, 0,							\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _normal ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_A8_MASK_FAST_PATH_PAD(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_PAD_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _pad ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_A8_MASK_FAST_PATH_NONE(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_NONE_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _none ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_A8_MASK_FAST_PATH_COVER(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	SCALED_BILINEAR_FLAGS | FAST_PATH_SAMPLES_COVER_CLIP_BILINEAR,	\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _cover ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_A8_MASK_FAST_PATH_NORMAL(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_NORMAL_REPEAT	|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_a8, MASK_FLAGS (a8, FAST_PATH_UNIFIED_ALPHA),		\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _normal ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_PAD(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_PAD_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _pad ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_NONE(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_NONE_REPEAT		|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _none ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_COVER(op,s,d,func)		\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	SCALED_BILINEAR_FLAGS | FAST_PATH_SAMPLES_COVER_CLIP_BILINEAR,	\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _cover ## _ ## op,	\
      }
  
  #define SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_NORMAL(op,s,d,func)	\
      {   PIXMAN_OP_ ## op,						\
  	PIXMAN_ ## s,							\
  	(SCALED_BILINEAR_FLAGS		|				\
  	 FAST_PATH_NORMAL_REPEAT	|				\
  	 FAST_PATH_X_UNIT_POSITIVE),					\
  	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
  	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
  	fast_composite_scaled_bilinear_ ## func ## _normal ## _ ## op,	\
      }
  
  /* Prefer the use of 'cover' variant, because it is faster */
  #define SIMPLE_BILINEAR_FAST_PATH(op,s,d,func)				\
      SIMPLE_BILINEAR_FAST_PATH_COVER (op,s,d,func),			\
      SIMPLE_BILINEAR_FAST_PATH_NONE (op,s,d,func),			\
      SIMPLE_BILINEAR_FAST_PATH_PAD (op,s,d,func),			\
      SIMPLE_BILINEAR_FAST_PATH_NORMAL (op,s,d,func)
  
  #define SIMPLE_BILINEAR_A8_MASK_FAST_PATH(op,s,d,func)			\
      SIMPLE_BILINEAR_A8_MASK_FAST_PATH_COVER (op,s,d,func),		\
      SIMPLE_BILINEAR_A8_MASK_FAST_PATH_NONE (op,s,d,func),		\
      SIMPLE_BILINEAR_A8_MASK_FAST_PATH_PAD (op,s,d,func),		\
      SIMPLE_BILINEAR_A8_MASK_FAST_PATH_NORMAL (op,s,d,func)
  
  #define SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH(op,s,d,func)		\
      SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_COVER (op,s,d,func),		\
      SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_NONE (op,s,d,func),		\
      SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_PAD (op,s,d,func),		\
      SIMPLE_BILINEAR_SOLID_MASK_FAST_PATH_NORMAL (op,s,d,func)
  
  #endif
  