Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_display_driver_16bpp_rotated_simple_line_draw.c	Lines:	216	216	100.0 %
Date:	2025-09-29 22:21:50	Branches:	126	126	100.0 %


/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation
 *
 * 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                                                  */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  12-31-2020     Kenneth Maxwell          Initial Version 6.1.3         */
/*                                                                        */
/**************************************************************************/
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			*
4			* This program and the accompanying materials are made available under the
5			* terms of the MIT License which is available at
6			* https://opensource.org/licenses/MIT.
7			*
8			* SPDX-License-Identifier: MIT
9			**************************************************************************/
10
11
12			/**************************************************************************/
13			/**************************************************************************/
14			/** */
15			/** GUIX Component */
16			/** */
17			/** Display Management (Display) */
18			/** */
19			/**************************************************************************/
20
21
22			#define PIXEL_WRITE(loc, val) (*(loc) = ((USHORT)val))
23
24			#define GX_SOURCE_CODE
25
26			/* Include necessary system files. */
27
28			#include "gx_api.h"
29			#include "gx_utility.h"
30			#include "gx_display.h"
31
32			/**************************************************************************/
33			/* */
34			/* FUNCTION RELEASE */
35			/* */
36			/* _gx_display_driver_16bpp_rotated_simple_line_draw PORTABLE C */
37			/* 6.1.3 */
38			/* AUTHOR */
39			/* */
40			/* Kenneth Maxwell, Microsoft Corporation */
41			/* */
42			/* DESCRIPTION */
43			/* */
44			/* Generic 16bpp color format line draw function. */
45			/* */
46			/* INPUT */
47			/* */
48			/* context Drawing context */
49			/* xstart x-coord of endpoint */
50			/* ystart y-coord of endpoint */
51			/* xend x-coord of endpoint */
52			/* yend y-coord of endpoint */
53			/* */
54			/* OUTPUT */
55			/* */
56			/* None */
57			/* */
58			/* CALLS */
59			/* */
60			/* _gx_display_driver_simple_line_alpha_draw */
61			/* Generic line draw with alpha */
62			/* _gx_display_driver_16bpp_simple_line_draw */
63			/* Generic 16bpp line draw */
64			/* */
65			/* CALLED BY */
66			/* */
67			/* GUIX Internal Code */
68			/* */
69			/* RELEASE HISTORY */
70			/* */
71			/* DATE NAME DESCRIPTION */
72			/* */
73			/* 12-31-2020 Kenneth Maxwell Initial Version 6.1.3 */
74			/* */
75			/**************************************************************************/
76		604	VOID _gx_display_driver_16bpp_rotated_simple_line_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend)
77			{
78			INT curx;
79			INT cury;
80			INT x_sign;
81			INT y_sign;
82			INT decision;
83			INT nextx;
84			INT nexty;
85			INT y_increment;
86			GX_POINT end_point;
87			GX_POINT mid_point;
88			GX_RECTANGLE half_rectangle;
89			GX_RECTANGLE half_over;
90			INT sign;
91			INT steps;
92
93			USHORT *put;
94			USHORT *next_put;
95
96		604	GX_BOOL clipped = GX_TRUE;
97			INT dx;
98			INT dy;
99
100			GX_RECTANGLE *clip;
101			GX_RECTANGLE rotated_clip;
102			GX_COLOR linecolor;
103
104			#if defined GX_BRUSH_ALPHA_SUPPORT
105			GX_UBYTE alpha;
106
107		604	alpha = context -> gx_draw_context_brush.gx_brush_alpha;
108	✓✓	604	if (alpha == 0)
109			{
110			/* Nothing to drawn. Just return. */
111		60	return;
112			}
113	✓✓	574	if (alpha != 0xff)
114			{
115		30	_gx_display_driver_simple_line_alpha_draw(context, xstart, ystart, xend, yend, alpha);
116		30	return;
117			}
118			#endif
119
120		544	GX_SWAP_VALS(xstart, ystart);
121		544	GX_SWAP_VALS(xend, yend);
122		544	clip = context -> gx_draw_context_clip;
123
124	✓✓	544	if (context -> gx_draw_context_display -> gx_display_rotation_angle == GX_SCREEN_ROTATION_CW)
125			{
126		277	ystart = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - ystart - 1;
127		277	yend = context -> gx_draw_context_canvas -> gx_canvas_x_resolution - yend - 1;
128
129		277	rotated_clip.gx_rectangle_left = clip -> gx_rectangle_top;
130		277	rotated_clip.gx_rectangle_right = clip -> gx_rectangle_bottom;
131		277	rotated_clip.gx_rectangle_top = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_right - 1);
132		277	rotated_clip.gx_rectangle_bottom = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_x_resolution - clip -> gx_rectangle_left - 1);
133			}
134			else
135			{
136		267	xstart = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xstart - 1;
137		267	xend = context -> gx_draw_context_canvas -> gx_canvas_y_resolution - xend - 1;
138
139		267	rotated_clip.gx_rectangle_left = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_bottom - 1);
140		267	rotated_clip.gx_rectangle_right = (GX_VALUE)(context -> gx_draw_context_canvas -> gx_canvas_y_resolution - clip -> gx_rectangle_top - 1);
141		267	rotated_clip.gx_rectangle_top = clip -> gx_rectangle_left;
142		267	rotated_clip.gx_rectangle_bottom = clip -> gx_rectangle_right;
143			}
144
145		544	dx = GX_ABS(xend - xstart);
146		544	dy = GX_ABS(yend - ystart);
147
148
149		544	linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
150
151	✓✓✓✓ ✓✓✓✓	544	if (((dx >= dy && (xstart > xend)) \|\| ((dy > dx) && ystart > yend)))
152			{
153		271	GX_SWAP_VALS(xend, xstart);
154		271	GX_SWAP_VALS(yend, ystart);
155			}
156		544	x_sign = (xend - xstart) / dx;
157		544	y_sign = (yend - ystart) / dy;
158
159	✓✓	544	if (y_sign > 0)
160			{
161		374	y_increment = context -> gx_draw_context_pitch;
162			}
163			else
164			{
165		170	y_increment = 0 - context -> gx_draw_context_pitch;
166			}
167
168		544	put = (USHORT )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
169		544	next_put = (USHORT )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
170
171
172		544	end_point.gx_point_x = (GX_VALUE)xstart;
173		544	end_point.gx_point_y = (GX_VALUE)ystart;
174
175	✓✓	544	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
176			{
177		523	end_point.gx_point_x = (GX_VALUE)xend;
178		523	end_point.gx_point_y = (GX_VALUE)yend;
179
180	✓✓	523	if (_gx_utility_rectangle_point_detect(&rotated_clip, end_point))
181			{
182		514	clipped = GX_FALSE;
183			}
184			}
185
186	✓✓	544	if (clipped)
187			{
188			/* here if we must do clipping in the inner loop, because one
189			or both of the end points are outside clipping rectangle */
190
191			/* Calculate the middle point of the line. */
192		30	mid_point.gx_point_x = (GX_VALUE)((xend + xstart) >> 1);
193		30	mid_point.gx_point_y = (GX_VALUE)((yend + ystart) >> 1);
194
195			/* Judge the clip in which side. */
196	✓✓	30	if (_gx_utility_rectangle_point_detect(&rotated_clip, mid_point))
197			{
198
199			/* the clip in two sides. */
200	✓✓	22	if (dx >= dy)
201			{
202			/* walk out the clipping point. */
203	✓✓	171	for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
204		161	curx++, decision += dy)
205			{
206	✓✓	170	if (decision >= dx)
207			{
208		47	decision -= dx;
209		47	cury += y_sign;
210		47	put += y_increment;
211			}
212
213	✓✓	170	if (curx >= rotated_clip.gx_rectangle_left &&
214	✓✓	95	cury >= rotated_clip.gx_rectangle_top &&
215	✓✓	57	cury <= rotated_clip.gx_rectangle_bottom)
216			{
217		9	break;
218			}
219		161	put++;
220			}
221	✓✓	295	for (; curx <= mid_point.gx_point_x;
222		285	curx++, decision += dy)
223			{
224	✓✓	285	if (decision >= dx)
225			{
226		113	decision -= dx;
227		113	cury += y_sign;
228		113	put += y_increment;
229			}
230		285	PIXEL_WRITE(put, linecolor);
231		285	put++;
232			}
233	✓✓	171	for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
234		161	nextx--, decision += dy)
235			{
236	✓✓	170	if (decision >= dx)
237			{
238		47	decision -= dx;
239		47	nexty -= y_sign;
240		47	next_put -= y_increment;
241			}
242	✓✓	170	if (nextx <= rotated_clip.gx_rectangle_right &&
243	✓✓	95	nexty >= rotated_clip.gx_rectangle_top &&
244	✓✓	47	nexty <= rotated_clip.gx_rectangle_bottom)
245			{
246		9	break;
247			}
248		161	next_put--;
249			}
250
251	✓✓	289	for (; nextx > mid_point.gx_point_x;
252		279	nextx--, decision += dy)
253			{
254	✓✓	279	if (decision >= dx)
255			{
256		111	decision -= dx;
257		111	nexty -= y_sign;
258		111	next_put -= y_increment;
259			}
260		279	PIXEL_WRITE(next_put, linecolor);
261		279	next_put--;
262			}
263			}
264			else
265			{
266	✓✓	381	for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
267		369	nexty--, decision += dx)
268			{
269	✓✓	380	if (decision >= dy)
270			{
271		86	decision -= dy;
272		86	nextx -= x_sign;
273		86	next_put -= x_sign;
274			}
275	✓✓	380	if (nextx >= rotated_clip.gx_rectangle_left &&
276	✓✓	176	nextx <= rotated_clip.gx_rectangle_right &&
277	✓✓	128	nexty <= rotated_clip.gx_rectangle_bottom)
278			{
279		11	break;
280			}
281		369	next_put -= context -> gx_draw_context_pitch;
282			}
283
284	✓✓	693	for (; nexty > mid_point.gx_point_y;
285		681	nexty--, decision += dx)
286			{
287	✓✓	681	if (decision >= dy)
288			{
289		196	decision -= dy;
290		196	nextx -= x_sign;
291		196	next_put -= x_sign;
292			}
293		681	PIXEL_WRITE(next_put, linecolor);
294		681	next_put -= context -> gx_draw_context_pitch;
295			}
296
297			/* walk out the clipping point. */
298	✓✓	381	for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
299		369	cury++, decision += dx)
300			{
301	✓✓	380	if (decision >= dy)
302			{
303		86	decision -= dy;
304		86	curx += x_sign;
305		86	put += x_sign;
306			}
307
308	✓✓	380	if (curx >= rotated_clip.gx_rectangle_left &&
309	✓✓	332	curx <= rotated_clip.gx_rectangle_right &&
310	✓✓	128	cury >= rotated_clip.gx_rectangle_top)
311			{
312		11	break;
313			}
314		369	put += context -> gx_draw_context_pitch;
315			}
316	✓✓	701	for (; cury <= mid_point.gx_point_y;
317		689	cury++, decision += dx)
318			{
319	✓✓	689	if (decision >= dy)
320			{
321		196	decision -= dy;
322		196	curx += x_sign;
323		196	put += x_sign;
324			}
325		689	PIXEL_WRITE(put, linecolor);
326		689	put += context -> gx_draw_context_pitch;
327			}
328			}
329			}
330			else
331			{
332			/* The clip stay at one side. */
333	✓✓	8	if (dx >= dy)
334			{
335		4	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
336		4	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
337	✓✓	4	if (y_sign == 1)
338			{
339		2	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
340		2	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
341			}
342			else
343			{
344		2	half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
345		2	half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
346			}
347
348	✓✓	4	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
349			{
350		2	curx = xstart;
351		2	cury = ystart;
352		2	steps = mid_point.gx_point_x - curx + 1;
353		2	sign = 1;
354			}
355			else
356			{
357		2	curx = xend;
358		2	cury = yend;
359		2	steps = xend - mid_point.gx_point_x;
360		2	sign = -1;
361		2	y_increment = 0 - y_increment;
362		2	y_sign = 0 - y_sign;
363		2	put = next_put;
364			}
365	✓✓	529	for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
366			{
367	✓✓	525	if (decision >= dx)
368			{
369		191	decision -= dx;
370		191	cury += y_sign;
371		191	put += y_increment;
372			}
373
374	✓✓	525	if (curx >= rotated_clip.gx_rectangle_left &&
375	✓✓	517	curx <= rotated_clip.gx_rectangle_right &&
376	✓✓	508	cury >= rotated_clip.gx_rectangle_top &&
377	✓✓	371	cury <= rotated_clip.gx_rectangle_bottom)
378			{
379		234	PIXEL_WRITE(put, linecolor);
380			}
381		525	put += sign;
382			}
383			}
384			else
385			{
386		4	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
387		4	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
388	✓✓	4	if (x_sign == 1)
389			{
390		2	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
391		2	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
392			}
393			else
394			{
395		2	half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
396		2	half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
397			}
398
399	✓✓	4	if (_gx_utility_rectangle_overlap_detect(&rotated_clip, &half_rectangle, &half_over))
400			{
401		2	curx = xstart;
402		2	cury = ystart;
403		2	steps = mid_point.gx_point_y - cury + 1;
404		2	y_increment = context -> gx_draw_context_pitch;
405		2	sign = 1;
406			}
407			else
408			{
409		2	curx = xend;
410		2	cury = yend;
411		2	steps = yend - mid_point.gx_point_y;
412		2	sign = -1;
413		2	y_increment = 0 - context -> gx_draw_context_pitch;
414		2	x_sign = 0 - x_sign;
415		2	put = next_put;
416			}
417
418	✓✓	983	for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
419			{
420	✓✓	979	if (decision >= dy)
421			{
422		248	decision -= dy;
423		248	curx += x_sign;
424		248	put += x_sign;
425			}
426	✓✓	979	if (curx >= rotated_clip.gx_rectangle_left &&
427	✓✓	970	curx <= rotated_clip.gx_rectangle_right &&
428	✓✓	960	cury >= rotated_clip.gx_rectangle_top &&
429	✓✓	856	cury <= rotated_clip.gx_rectangle_bottom)
430			{
431		752	PIXEL_WRITE(put, linecolor);
432			}
433		979	put += y_increment;
434			}
435			}
436			}
437			}
438			else
439			{
440			/* here if both line ends lie within clipping rectangle, we can
441			run a faster inner loop */
442	✓✓	514	if (dx >= dy)
443			{
444		248	put = (USHORT )(context -> gx_draw_context_memory) + ystart context -> gx_draw_context_pitch + xstart;
445		248	next_put = (USHORT )(context -> gx_draw_context_memory) + yend context -> gx_draw_context_pitch + xend;
446
447		248	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
448	✓✓	22488	decision = (dx >> 1); curx <= nextx; curx++, nextx--,
449		22240	decision += dy)
450			{
451
452	✓✓	22240	if (decision >= dx)
453			{
454		9938	decision -= dx;
455		9938	cury += y_sign;
456		9938	nexty -= y_sign;
457
458		9938	put += y_increment;
459		9938	next_put -= y_increment;
460			}
461		22240	PIXEL_WRITE(put, linecolor);
462		22240	PIXEL_WRITE(next_put, linecolor);
463
464		22240	put++;
465		22240	next_put--;
466			}
467			}
468			else
469			{
470
471		266	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
472	✓✓	24466	decision = (dy >> 1); cury <= nexty; cury++, nexty--,
473		24200	decision += dx)
474			{
475	✓✓	24200	if (decision >= dy)
476			{
477		9910	decision -= dy;
478		9910	curx += x_sign;
479		9910	nextx -= x_sign;
480
481		9910	put += x_sign;
482		9910	next_put -= x_sign;
483			}
484		24200	PIXEL_WRITE(put, linecolor);
485		24200	PIXEL_WRITE(next_put, linecolor);
486
487		24200	put += context -> gx_draw_context_pitch;
488		24200	next_put -= context -> gx_draw_context_pitch;
489			}
490			}
491			}
492			}
493