path: root/recipes/xorg-lib/pixman-0.21.6/0007-Main-loop-template-for-fast-single-pass-bilinear-sca.patch

From d506bf68fd0e9a1c5dd484daee70631699918387 Mon Sep 17 00:00:00 2001
From: Siarhei Siamashka <siarhei.siamashka@nokia.com>
Date: Mon, 21 Feb 2011 01:29:02 +0200
Subject: [PATCH 07/40] Main loop template for fast single pass bilinear scaling

Can be used for implementing SIMD optimized fast path
functions which work with bilinear scaled source images.

Similar to the template for nearest scaling main loop, the
following types of mask are supported:
1. no mask
2. non-scaled a8 mask with SAMPLES_COVER_CLIP flag
3. solid mask

PAD repeat is fully supported. NONE repeat is partially
supported (right now only works if source image has alpha
channel or when alpha channel of the source image does not
have any effect on the compositing operation).
---
 pixman/pixman-fast-path.h |  432 +++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 432 insertions(+), 0 deletions(-)

diff --git a/pixman/pixman-fast-path.h b/pixman/pixman-fast-path.h
index d081222..1885d47 100644
--- a/pixman/pixman-fast-path.h
+++ b/pixman/pixman-fast-path.h
@@ -587,4 +587,436 @@ fast_composite_scaled_nearest  ## scale_func_name (pixman_implementation_t *imp,
     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, have_mask, mask_is_solid)		\
+static void											\
+fast_composite_scaled_bilinear ## scale_func_name (pixman_implementation_t *imp,		\
+						   pixman_op_t              op,			\
+						   pixman_image_t *         src_image,		\
+						   pixman_image_t *         mask_image,		\
+						   pixman_image_t *         dst_image,		\
+						   int32_t                  src_x,		\
+						   int32_t                  src_y,		\
+						   int32_t                  mask_x,		\
+						   int32_t                  mask_y,		\
+						   int32_t                  dst_x,		\
+						   int32_t                  dst_y,		\
+						   int32_t                  width,		\
+						   int32_t                  height)		\
+{												\
+    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;							\
+												\
+    PIXMAN_IMAGE_GET_LINE (dst_image, dst_x, dst_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, dst_image->bits.format);	\
+	    mask_stride = 0;									\
+	}											\
+	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];						\
+												\
+    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;							\
+    }												\
+												\
+    while (--height >= 0)									\
+    {												\
+	int weight1, weight2;									\
+	dst = dst_line;										\
+	dst_line += dst_stride;									\
+	vx = v.vector[0];									\
+	if (have_mask && !mask_is_solid)							\
+	{											\
+	    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 (have_mask && !mask_is_solid)						\
+		    mask += left_pad;								\
+	    }											\
+	    if (width > 0)									\
+	    {											\
+		scanline_func (dst, mask,							\
+			       src1, src2, width, weight1, weight2, vx, unit_x, 0, FALSE);	\
+		dst += width;									\
+		if (have_mask && !mask_is_solid)						\
+		    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 (have_mask && !mask_is_solid)						\
+		    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 (have_mask && !mask_is_solid)						\
+		    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 (have_mask && !mask_is_solid)						\
+		    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 (have_mask && !mask_is_solid)						\
+		    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											\
+	{											\
+	    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, have_mask, mask_is_solid)		\
+	FAST_BILINEAR_MAINLOOP_INT(_ ## scale_func_name, scanline_func, src_type_t, mask_type_t,\
+				  dst_type_t, repeat_mode, have_mask, mask_is_solid)
+
+#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,		\
+	PIXMAN_null, 0,							\
+	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
+	fast_composite_scaled_bilinear_ ## func ## _cover ## _ ## 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,		\
+	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_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,		\
+	PIXMAN_solid, MASK_FLAGS (solid, FAST_PATH_UNIFIED_ALPHA),	\
+	PIXMAN_ ## d, FAST_PATH_STD_DEST_FLAGS,				\
+	fast_composite_scaled_bilinear_ ## func ## _cover ## _ ## 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)
+
+#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)
+
+#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)
+
 #endif
-- 
1.6.6.1