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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_display_driver_16bpp_rotated_simple_line_draw.c	Lines:	216	216	100.0 %
Date:	2026-03-06 19:21:09	Branches:	126	126	100.0 %


/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 * Copyright (c) 2026-present Eclipse ThreadX contributors
 *
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 **************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** GUIX Component                                                        */
/**                                                                       */
/**   Display Management (Display)                                        */
/**                                                                       */
/**************************************************************************/


#define PIXEL_WRITE(loc, val) (*(loc) = ((USHORT)val))

#define GX_SOURCE_CODE

/* Include necessary system files.  */

#include "gx_api.h"
#include "gx_utility.h"
#include "gx_display.h"

/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _gx_display_driver_16bpp_rotated_simple_line_draw   PORTABLE C      */
/*                                                           6.1.3        */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    Generic 16bpp color format line draw function.                      */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    context                               Drawing context               */
/*    xstart                                x-coord of endpoint           */
/*    ystart                                y-coord of endpoint           */
/*    xend                                  x-coord of endpoint           */
/*    yend                                  y-coord of endpoint           */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _gx_display_driver_simple_line_alpha_draw                           */
/*                                          Generic line draw with alpha  */
/*    _gx_display_driver_16bpp_simple_line_draw                           */
/*                                          Generic 16bpp line draw       */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    GUIX Internal Code                                                  */
/*                                                                        */
/**************************************************************************/
VOID _gx_display_driver_16bpp_rotated_simple_line_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend)
{
INT           curx;
INT           cury;
INT           x_sign;
INT           y_sign;
INT           decision;
INT           nextx;
INT           nexty;
INT           y_increment;
GX_POINT      end_point;
GX_POINT      mid_point;
GX_RECTANGLE  half_rectangle;
GX_RECTANGLE  half_over;
INT           sign;
INT           steps;

USHORT       *put;
USHORT       *next_put;

GX_BOOL       clipped = GX_TRUE;
INT           dx;
INT           dy;

GX_RECTANGLE *clip;
GX_RECTANGLE  rotated_clip;
GX_COLOR      linecolor;

#if defined GX_BRUSH_ALPHA_SUPPORT
GX_UBYTE alpha;

    alpha = context -> gx_draw_context_brush.gx_brush_alpha;
    if (alpha == 0)
    {
        /* Nothing to drawn. Just return. */
        return;
    }
    if (alpha != 0xff)
    {
        _gx_display_driver_simple_line_alpha_draw(context, xstart, ystart, xend, yend, alpha);
        return;
    }
#endif

    GX_SWAP_VALS(xstart, ystart);
    GX_SWAP_VALS(xend, yend);
    clip = context -> gx_draw_context_clip;

    if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
    {
        ystart = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - ystart - 1;
        yend = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - yend - 1;

        rotated_clip.gx_rectangle_left = clip -> gx_rectangle_top;
        rotated_clip.gx_rectangle_right = clip -> gx_rectangle_bottom;
        rotated_clip.gx_rectangle_top = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_right - 1);
        rotated_clip.gx_rectangle_bottom = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_left - 1);
    }
    else
    {
        xstart = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xstart - 1;
        xend = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xend - 1;

        rotated_clip.gx_rectangle_left = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_bottom - 1);
        rotated_clip.gx_rectangle_right = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_top - 1);
        rotated_clip.gx_rectangle_top = clip -> gx_rectangle_left;
        rotated_clip.gx_rectangle_bottom = clip -> gx_rectangle_right;
    }

    dx = GX_ABS(xend - xstart);
    dy = GX_ABS(yend - ystart);


    linecolor = context -> gx_draw_context_brush.gx_brush_line_color;

    if (((dx >= dy && (xstart > xend)) || ((dy > dx) && ystart > yend)))
    {
        GX_SWAP_VALS(xend, xstart);
        GX_SWAP_VALS(yend, ystart);
    }
    x_sign = (xend - xstart) / dx;
    y_sign = (yend - ystart) / dy;

    if (y_sign > 0)
    {
        y_increment = context -> gx_draw_context_pitch;
    }
    else
    {
        y_increment = 0 - context -> gx_draw_context_pitch;
    }

    put = (USHORT *)(context -> gx_draw_context_memory) + ystart * context -> gx_draw_context_pitch + xstart;
    next_put = (USHORT *)(context -> gx_draw_context_memory) + yend * context -> gx_draw_context_pitch + xend;


    end_point.gx_point_x = (GX_VALUE)xstart;
    end_point.gx_point_y = (GX_VALUE)ystart;

    if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
    {
        end_point.gx_point_x = (GX_VALUE)xend;
        end_point.gx_point_y = (GX_VALUE)yend;

        if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
        {
            clipped = GX_FALSE;
        }
    }

    if (clipped)
    {
        /* here if we must do clipping in the inner loop, because one
           or both of the end points are outside clipping rectangle */

        /* Calculate the middle point of the line.  */
        mid_point.gx_point_x = (GX_VALUE)((xend + xstart) >> 1);
        mid_point.gx_point_y = (GX_VALUE)((yend + ystart) >> 1);

        /* Judge the clip in which side.  */
        if (_gx_utility_rectangle_point_detect(&rotated_clip, mid_point))
        {

            /* the clip in two sides.  */
            if (dx >= dy)
            {
                /* walk out the clipping point.  */
                for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
                     curx++, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                        put += y_increment;
                    }

                    if (curx >= rotated_clip.gx_rectangle_left &&
                        cury >= rotated_clip.gx_rectangle_top &&
                        cury <= rotated_clip.gx_rectangle_bottom)
                    {
                        break;
                    }
                    put++;
                }
                for (; curx <= mid_point.gx_point_x;
                     curx++, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                        put += y_increment;
                    }
                    PIXEL_WRITE(put, linecolor);
                    put++;
                }
                for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
                     nextx--, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        nexty -= y_sign;
                        next_put -= y_increment;
                    }
                    if (nextx <= rotated_clip.gx_rectangle_right &&
                        nexty >= rotated_clip.gx_rectangle_top &&
                        nexty <= rotated_clip.gx_rectangle_bottom)
                    {
                        break;
                    }
                    next_put--;
                }

                for (; nextx > mid_point.gx_point_x;
                     nextx--, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        nexty -= y_sign;
                        next_put -= y_increment;
                    }
                    PIXEL_WRITE(next_put, linecolor);
                    next_put--;
                }
            }
            else
            {
                for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
                     nexty--, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        nextx -= x_sign;
                        next_put -= x_sign;
                    }
                    if (nextx >= rotated_clip.gx_rectangle_left &&
                        nextx <= rotated_clip.gx_rectangle_right &&
                        nexty <= rotated_clip.gx_rectangle_bottom)
                    {
                        break;
                    }
                    next_put -= context -> gx_draw_context_pitch;
                }

                for (; nexty > mid_point.gx_point_y;
                     nexty--, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        nextx -= x_sign;
                        next_put -= x_sign;
                    }
                    PIXEL_WRITE(next_put, linecolor);
                    next_put -= context -> gx_draw_context_pitch;
                }

                /* walk out the clipping point.  */
                for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
                     cury++, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                        put += x_sign;
                    }

                    if (curx >= rotated_clip.gx_rectangle_left &&
                        curx <= rotated_clip.gx_rectangle_right &&
                        cury >= rotated_clip.gx_rectangle_top)
                    {
                        break;
                    }
                    put += context -> gx_draw_context_pitch;
                }
                for (; cury <= mid_point.gx_point_y;
                     cury++, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                        put += x_sign;
                    }
                    PIXEL_WRITE(put, linecolor);
                    put += context -> gx_draw_context_pitch;
                }
            }
        }
        else
        {
            /* The clip stay at one side.  */
            if (dx >= dy)
            {
                half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
                half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
                if (y_sign == 1)
                {
                    half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
                    half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
                }
                else
                {
                    half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
                    half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
                }

                if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
                {
                    curx = xstart;
                    cury = ystart;
                    steps = mid_point.gx_point_x - curx + 1;
                    sign = 1;
                }
                else
                {
                    curx = xend;
                    cury = yend;
                    steps = xend - mid_point.gx_point_x;
                    sign = -1;
                    y_increment = 0 - y_increment;
                    y_sign = 0 - y_sign;
                    put = next_put;
                }
                for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                        put += y_increment;
                    }

                    if (curx >= rotated_clip.gx_rectangle_left &&
                        curx <= rotated_clip.gx_rectangle_right &&
                        cury >= rotated_clip.gx_rectangle_top &&
                        cury <= rotated_clip.gx_rectangle_bottom)
                    {
                        PIXEL_WRITE(put, linecolor);
                    }
                    put += sign;
                }
            }
            else
            {
                half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
                half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
                if (x_sign == 1)
                {
                    half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
                    half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
                }
                else
                {
                    half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
                    half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
                }

                if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
                {
                    curx = xstart;
                    cury = ystart;
                    steps = mid_point.gx_point_y - cury + 1;
                    y_increment = context -> gx_draw_context_pitch;
                    sign = 1;
                }
                else
                {
                    curx = xend;
                    cury = yend;
                    steps = yend - mid_point.gx_point_y;
                    sign = -1;
                    y_increment = 0 - context -> gx_draw_context_pitch;
                    x_sign = 0 - x_sign;
                    put = next_put;
                }

                for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                        put += x_sign;
                    }
                    if (curx >= rotated_clip.gx_rectangle_left &&
                        curx <= rotated_clip.gx_rectangle_right &&
                        cury >= rotated_clip.gx_rectangle_top &&
                        cury <= rotated_clip.gx_rectangle_bottom)
                    {
                        PIXEL_WRITE(put, linecolor);
                    }
                    put += y_increment;
                }
            }
        }
    }
    else
    {
        /* here if both line ends lie within clipping rectangle, we can
           run a faster inner loop */
        if (dx >= dy)
        {
            put = (USHORT *)(context -> gx_draw_context_memory) + ystart * context -> gx_draw_context_pitch + xstart;
            next_put = (USHORT *)(context -> gx_draw_context_memory) + yend * context -> gx_draw_context_pitch + xend;

            for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
                 decision = (dx >> 1); curx <= nextx; curx++, nextx--,
                 decision += dy)
            {

                if (decision >= dx)
                {
                    decision -= dx;
                    cury += y_sign;
                    nexty -= y_sign;

                    put += y_increment;
                    next_put -= y_increment;
                }
                PIXEL_WRITE(put, linecolor);
                PIXEL_WRITE(next_put, linecolor);

                put++;
                next_put--;
            }
        }
        else
        {

            for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
                 decision = (dy >> 1); cury <= nexty; cury++, nexty--,
                 decision += dx)
            {
                if (decision >= dy)
                {
                    decision -= dy;
                    curx += x_sign;
                    nextx -= x_sign;

                    put += x_sign;
                    next_put -= x_sign;
                }
                PIXEL_WRITE(put, linecolor);
                PIXEL_WRITE(next_put, linecolor);

                put += context -> gx_draw_context_pitch;
                next_put -= context -> gx_draw_context_pitch;
            }
        }
    }
}



Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/***************************************************************************
2			* Copyright (c) 2024 Microsoft Corporation
3			* Copyright (c) 2026-present Eclipse ThreadX contributors
4			*
5			* This program and the accompanying materials are made available under the
6			* terms of the MIT License which is available at
7			* https://opensource.org/licenses/MIT.
8			*
9			* SPDX-License-Identifier: MIT
10			**************************************************************************/
11
12
13			/**************************************************************************/
14			/**************************************************************************/
15			/** */
16			/** GUIX Component */
17			/** */
18			/** Display Management (Display) */
19			/** */
20			/**************************************************************************/
21
22
23			#define PIXEL_WRITE(loc, val) (*(loc) = ((USHORT)val))
24
25			#define GX_SOURCE_CODE
26
27			/* Include necessary system files. */
28
29			#include "gx_api.h"
30			#include "gx_utility.h"
31			#include "gx_display.h"
32
33			/**************************************************************************/
34			/* */
35			/* FUNCTION RELEASE */
36			/* */
37			/* _gx_display_driver_16bpp_rotated_simple_line_draw PORTABLE C */
38			/* 6.1.3 */
39			/* AUTHOR */
40			/* */
41			/* Kenneth Maxwell, Microsoft Corporation */
42			/* */
43			/* DESCRIPTION */
44			/* */
45			/* Generic 16bpp color format line draw function. */
46			/* */
47			/* INPUT */
48			/* */
49			/* context Drawing context */
50			/* xstart x-coord of endpoint */
51			/* ystart y-coord of endpoint */
52			/* xend x-coord of endpoint */
53			/* yend y-coord of endpoint */
54			/* */
55			/* OUTPUT */
56			/* */
57			/* None */
58			/* */
59			/* CALLS */
60			/* */
61			/* _gx_display_driver_simple_line_alpha_draw */
62			/* Generic line draw with alpha */
63			/* _gx_display_driver_16bpp_simple_line_draw */
64			/* Generic 16bpp line draw */
65			/* */
66			/* CALLED BY */
67			/* */
68			/* GUIX Internal Code */
69			/* */
70			/**************************************************************************/
71		604	VOID _gx_display_driver_16bpp_rotated_simple_line_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend)
72			{
73			INT curx;
74			INT cury;
75			INT x_sign;
76			INT y_sign;
77			INT decision;
78			INT nextx;
79			INT nexty;
80			INT y_increment;
81			GX_POINT end_point;
82			GX_POINT mid_point;
83			GX_RECTANGLE half_rectangle;
84			GX_RECTANGLE half_over;
85			INT sign;
86			INT steps;
87
88			USHORT *put;
89			USHORT *next_put;
90
91		604	GX_BOOL clipped = GX_TRUE;
92			INT dx;
93			INT dy;
94
95			GX_RECTANGLE *clip;
96			GX_RECTANGLE rotated_clip;
97			GX_COLOR linecolor;
98
99			#if defined GX_BRUSH_ALPHA_SUPPORT
100			GX_UBYTE alpha;
101
102		604	alpha = context -> gx_draw_context_brush.gx_brush_alpha;
103	✓✓	604	if (alpha == 0)
104			{
105			/* Nothing to drawn. Just return. */
106		60	return;
107			}
108	✓✓	574	if (alpha != 0xff)
109			{
110		30	_gx_display_driver_simple_line_alpha_draw(context, xstart, ystart, xend, yend, alpha);
111		30	return;
112			}
113			#endif
114
115		544	GX_SWAP_VALS(xstart, ystart);
116		544	GX_SWAP_VALS(xend, yend);
117		544	clip = context -> gx_draw_context_clip;
118
119	✓✓	544	if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
120			{
121		277	ystart = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - ystart - 1;
122		277	yend = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - yend - 1;
123
124		277	rotated_clip.gx_rectangle_left = clip -> gx_rectangle_top;
125		277	rotated_clip.gx_rectangle_right = clip -> gx_rectangle_bottom;
126		277	rotated_clip.gx_rectangle_top = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_right - 1);
127		277	rotated_clip.gx_rectangle_bottom = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_left - 1);
128			}
129			else
130			{
131		267	xstart = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xstart - 1;
132		267	xend = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xend - 1;
133
134		267	rotated_clip.gx_rectangle_left = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_bottom - 1);
135		267	rotated_clip.gx_rectangle_right = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_top - 1);
136		267	rotated_clip.gx_rectangle_top = clip -> gx_rectangle_left;
137		267	rotated_clip.gx_rectangle_bottom = clip -> gx_rectangle_right;
138			}
139
140		544	dx = GX_ABS(xend - xstart);
141		544	dy = GX_ABS(yend - ystart);
142
143
144		544	linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
145
146	✓✓✓✓ ✓✓✓✓	544	if (((dx >= dy && (xstart > xend)) \|\| ((dy > dx) && ystart > yend)))
147			{
148		271	GX_SWAP_VALS(xend, xstart);
149		271	GX_SWAP_VALS(yend, ystart);
150			}
151		544	x_sign = (xend - xstart) / dx;
152		544	y_sign = (yend - ystart) / dy;
153
154	✓✓	544	if (y_sign > 0)
155			{
156		374	y_increment = context -> gx_draw_context_pitch;
157			}
158			else
159			{
160		170	y_increment = 0 - context -> gx_draw_context_pitch;
161			}
162
163		544	put = (USHORT )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
164		544	next_put = (USHORT )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
165
166
167		544	end_point.gx_point_x = (GX_VALUE)xstart;
168		544	end_point.gx_point_y = (GX_VALUE)ystart;
169
170	✓✓	544	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
171			{
172		523	end_point.gx_point_x = (GX_VALUE)xend;
173		523	end_point.gx_point_y = (GX_VALUE)yend;
174
175	✓✓	523	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
176			{
177		514	clipped = GX_FALSE;
178			}
179			}
180
181	✓✓	544	if (clipped)
182			{
183			/* here if we must do clipping in the inner loop, because one
184			or both of the end points are outside clipping rectangle */
185
186			/* Calculate the middle point of the line. */
187		30	mid_point.gx_point_x = (GX_VALUE)((xend + xstart) >> 1);
188		30	mid_point.gx_point_y = (GX_VALUE)((yend + ystart) >> 1);
189
190			/* Judge the clip in which side. */
191	✓✓	30	if (_gx_utility_rectangle_point_detect(&rotated_clip, mid_point))
192			{
193
194			/* the clip in two sides. */
195	✓✓	22	if (dx >= dy)
196			{
197			/* walk out the clipping point. */
198	✓✓	171	for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
199		161	curx++, decision += dy)
200			{
201	✓✓	170	if (decision >= dx)
202			{
203		47	decision -= dx;
204		47	cury += y_sign;
205		47	put += y_increment;
206			}
207
208	✓✓	170	if (curx >= rotated_clip.gx_rectangle_left &&
209	✓✓	95	cury >= rotated_clip.gx_rectangle_top &&
210	✓✓	57	cury <= rotated_clip.gx_rectangle_bottom)
211			{
212		9	break;
213			}
214		161	put++;
215			}
216	✓✓	295	for (; curx <= mid_point.gx_point_x;
217		285	curx++, decision += dy)
218			{
219	✓✓	285	if (decision >= dx)
220			{
221		113	decision -= dx;
222		113	cury += y_sign;
223		113	put += y_increment;
224			}
225		285	PIXEL_WRITE(put, linecolor);
226		285	put++;
227			}
228	✓✓	171	for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
229		161	nextx--, decision += dy)
230			{
231	✓✓	170	if (decision >= dx)
232			{
233		47	decision -= dx;
234		47	nexty -= y_sign;
235		47	next_put -= y_increment;
236			}
237	✓✓	170	if (nextx <= rotated_clip.gx_rectangle_right &&
238	✓✓	95	nexty >= rotated_clip.gx_rectangle_top &&
239	✓✓	47	nexty <= rotated_clip.gx_rectangle_bottom)
240			{
241		9	break;
242			}
243		161	next_put--;
244			}
245
246	✓✓	289	for (; nextx > mid_point.gx_point_x;
247		279	nextx--, decision += dy)
248			{
249	✓✓	279	if (decision >= dx)
250			{
251		111	decision -= dx;
252		111	nexty -= y_sign;
253		111	next_put -= y_increment;
254			}
255		279	PIXEL_WRITE(next_put, linecolor);
256		279	next_put--;
257			}
258			}
259			else
260			{
261	✓✓	381	for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
262		369	nexty--, decision += dx)
263			{
264	✓✓	380	if (decision >= dy)
265			{
266		86	decision -= dy;
267		86	nextx -= x_sign;
268		86	next_put -= x_sign;
269			}
270	✓✓	380	if (nextx >= rotated_clip.gx_rectangle_left &&
271	✓✓	176	nextx <= rotated_clip.gx_rectangle_right &&
272	✓✓	128	nexty <= rotated_clip.gx_rectangle_bottom)
273			{
274		11	break;
275			}
276		369	next_put -= context -> gx_draw_context_pitch;
277			}
278
279	✓✓	693	for (; nexty > mid_point.gx_point_y;
280		681	nexty--, decision += dx)
281			{
282	✓✓	681	if (decision >= dy)
283			{
284		196	decision -= dy;
285		196	nextx -= x_sign;
286		196	next_put -= x_sign;
287			}
288		681	PIXEL_WRITE(next_put, linecolor);
289		681	next_put -= context -> gx_draw_context_pitch;
290			}
291
292			/* walk out the clipping point. */
293	✓✓	381	for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
294		369	cury++, decision += dx)
295			{
296	✓✓	380	if (decision >= dy)
297			{
298		86	decision -= dy;
299		86	curx += x_sign;
300		86	put += x_sign;
301			}
302
303	✓✓	380	if (curx >= rotated_clip.gx_rectangle_left &&
304	✓✓	332	curx <= rotated_clip.gx_rectangle_right &&
305	✓✓	128	cury >= rotated_clip.gx_rectangle_top)
306			{
307		11	break;
308			}
309		369	put += context -> gx_draw_context_pitch;
310			}
311	✓✓	701	for (; cury <= mid_point.gx_point_y;
312		689	cury++, decision += dx)
313			{
314	✓✓	689	if (decision >= dy)
315			{
316		196	decision -= dy;
317		196	curx += x_sign;
318		196	put += x_sign;
319			}
320		689	PIXEL_WRITE(put, linecolor);
321		689	put += context -> gx_draw_context_pitch;
322			}
323			}
324			}
325			else
326			{
327			/* The clip stay at one side. */
328	✓✓	8	if (dx >= dy)
329			{
330		4	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
331		4	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
332	✓✓	4	if (y_sign == 1)
333			{
334		2	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
335		2	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
336			}
337			else
338			{
339		2	half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
340		2	half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
341			}
342
343	✓✓	4	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
344			{
345		2	curx = xstart;
346		2	cury = ystart;
347		2	steps = mid_point.gx_point_x - curx + 1;
348		2	sign = 1;
349			}
350			else
351			{
352		2	curx = xend;
353		2	cury = yend;
354		2	steps = xend - mid_point.gx_point_x;
355		2	sign = -1;
356		2	y_increment = 0 - y_increment;
357		2	y_sign = 0 - y_sign;
358		2	put = next_put;
359			}
360	✓✓	529	for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
361			{
362	✓✓	525	if (decision >= dx)
363			{
364		191	decision -= dx;
365		191	cury += y_sign;
366		191	put += y_increment;
367			}
368
369	✓✓	525	if (curx >= rotated_clip.gx_rectangle_left &&
370	✓✓	517	curx <= rotated_clip.gx_rectangle_right &&
371	✓✓	508	cury >= rotated_clip.gx_rectangle_top &&
372	✓✓	371	cury <= rotated_clip.gx_rectangle_bottom)
373			{
374		234	PIXEL_WRITE(put, linecolor);
375			}
376		525	put += sign;
377			}
378			}
379			else
380			{
381		4	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
382		4	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
383	✓✓	4	if (x_sign == 1)
384			{
385		2	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
386		2	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
387			}
388			else
389			{
390		2	half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
391		2	half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
392			}
393
394	✓✓	4	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
395			{
396		2	curx = xstart;
397		2	cury = ystart;
398		2	steps = mid_point.gx_point_y - cury + 1;
399		2	y_increment = context -> gx_draw_context_pitch;
400		2	sign = 1;
401			}
402			else
403			{
404		2	curx = xend;
405		2	cury = yend;
406		2	steps = yend - mid_point.gx_point_y;
407		2	sign = -1;
408		2	y_increment = 0 - context -> gx_draw_context_pitch;
409		2	x_sign = 0 - x_sign;
410		2	put = next_put;
411			}
412
413	✓✓	983	for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
414			{
415	✓✓	979	if (decision >= dy)
416			{
417		248	decision -= dy;
418		248	curx += x_sign;
419		248	put += x_sign;
420			}
421	✓✓	979	if (curx >= rotated_clip.gx_rectangle_left &&
422	✓✓	970	curx <= rotated_clip.gx_rectangle_right &&
423	✓✓	960	cury >= rotated_clip.gx_rectangle_top &&
424	✓✓	856	cury <= rotated_clip.gx_rectangle_bottom)
425			{
426		752	PIXEL_WRITE(put, linecolor);
427			}
428		979	put += y_increment;
429			}
430			}
431			}
432			}
433			else
434			{
435			/* here if both line ends lie within clipping rectangle, we can
436			run a faster inner loop */
437	✓✓	514	if (dx >= dy)
438			{
439		248	put = (USHORT )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
440		248	next_put = (USHORT )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
441
442		248	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
443	✓✓	22488	decision = (dx >> 1); curx <= nextx; curx++, nextx--,
444		22240	decision += dy)
445			{
446
447	✓✓	22240	if (decision >= dx)
448			{
449		9938	decision -= dx;
450		9938	cury += y_sign;
451		9938	nexty -= y_sign;
452
453		9938	put += y_increment;
454		9938	next_put -= y_increment;
455			}
456		22240	PIXEL_WRITE(put, linecolor);
457		22240	PIXEL_WRITE(next_put, linecolor);
458
459		22240	put++;
460		22240	next_put--;
461			}
462			}
463			else
464			{
465
466		266	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
467	✓✓	24466	decision = (dy >> 1); cury <= nexty; cury++, nexty--,
468		24200	decision += dx)
469			{
470	✓✓	24200	if (decision >= dy)
471			{
472		9910	decision -= dy;
473		9910	curx += x_sign;
474		9910	nextx -= x_sign;
475
476		9910	put += x_sign;
477		9910	next_put -= x_sign;
478			}
479		24200	PIXEL_WRITE(put, linecolor);
480		24200	PIXEL_WRITE(next_put, linecolor);
481
482		24200	put += context -> gx_draw_context_pitch;
483		24200	next_put -= context -> gx_draw_context_pitch;
484			}
485			}
486			}
487			}
488