Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	gx_display_driver_simple_line_alpha_draw.c	Lines:	158	158	100.0 %
Date:	2026-03-06 19:21:09	Branches:	120	120	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"

#if defined (GX_BRUSH_ALPHA_SUPPORT)
/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _gx_display_driver_simple_line_alpha_draw           PORTABLE C      */
/*                                                           6.1          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    Kenneth Maxwell, Microsoft Corporation                              */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    Generic driver function that handles drawing lines with brush       */
/*    alpha.                                                              */
/*                                                                        */
/*  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_ABS                                Compute the absolute value    */
/*    GX_SWAP_VALUE                         Swap two values               */
/*    [PIXEL_WRITE]                         Driver level pixel write      */
/*                                            routine                     */
/*    [gx_display_driver_pixel_blend]       Basic display driver pixel    */
/*                                            blend function              */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    GUIX Internal Code                                                  */
/*                                                                        */
/**************************************************************************/
VOID _gx_display_driver_simple_line_alpha_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend, GX_UBYTE alpha)
{
INT           curx;
INT           cury;
INT           x_sign;
INT           y_sign;
INT           decision;
INT           nextx;
INT           nexty;
GX_POINT      end_point;
GX_POINT      mid_point;
GX_RECTANGLE  half_rectangle;
GX_RECTANGLE  half_over;
INT           sign;
INT           steps;
GX_BOOL       clipped = GX_TRUE;
INT           dx = GX_ABS(xend - xstart);
INT           dy = GX_ABS(yend - ystart);

GX_RECTANGLE *clip = context -> gx_draw_context_clip;
GX_COLOR      linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
VOID        (*blend_func)(GX_DRAW_CONTEXT *context, INT x, INT y, GX_COLOR fcolor, GX_UBYTE alpha);

    blend_func = context -> gx_draw_context_display -> gx_display_driver_pixel_blend;

    if (blend_func == GX_NULL)
    {
        return;
    }

    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;

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

    if (_gx_utility_rectangle_point_detect(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(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(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;
                    }

                    if (curx >= clip -> gx_rectangle_left &&
                        cury >= clip -> gx_rectangle_top &&
                        cury <= clip -> gx_rectangle_bottom)
                    {
                        break;
                    }
                }
                for (; curx <= mid_point.gx_point_x;
                    curx++, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                    }

                    blend_func(context, curx, cury, linecolor, alpha);
                }
                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;
                    }
                    if (nextx <= clip -> gx_rectangle_right &&
                        nexty >= clip -> gx_rectangle_top &&
                        nexty <= clip -> gx_rectangle_bottom)
                    {
                        break;
                    }
                }

                for (; nextx > mid_point.gx_point_x;
                    nextx--, decision += dy)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        nexty -= y_sign;
                    }
                    blend_func(context, nextx, nexty, linecolor, alpha);
                }
            }
            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;
                    }
                    if (nextx >= clip -> gx_rectangle_left &&
                        nextx <= clip -> gx_rectangle_right &&
                        nexty <= clip -> gx_rectangle_bottom)
                    {
                        break;
                    }
                }

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

                /* 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;
                    }

                    if (curx >= clip -> gx_rectangle_left &&
                        curx <= clip -> gx_rectangle_right &&
                        cury >= clip -> gx_rectangle_top)
                    {
                        break;
                    }
                }
                for (; cury <= mid_point.gx_point_y;
                    cury++, decision += dx)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                    }
                    blend_func(context, curx, cury, linecolor, alpha);
                }
            }
        }
        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(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_sign = 0 - y_sign;
                }
                for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
                {
                    if (decision >= dx)
                    {
                        decision -= dx;
                        cury += y_sign;
                    }

                    if (curx >= clip -> gx_rectangle_left &&
                        curx <= clip -> gx_rectangle_right &&
                        cury >= clip -> gx_rectangle_top &&
                        cury <= clip -> gx_rectangle_bottom)
                    {
                        blend_func(context, curx, cury, linecolor, alpha);
                    }
                }
            }
            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(clip, &half_rectangle, &half_over))
                {
                    curx = xstart;
                    cury = ystart;
                    steps = mid_point.gx_point_y - cury + 1;
                    sign = 1;
                }
                else
                {
                    curx = xend;
                    cury = yend;
                    steps = yend - mid_point.gx_point_y;
                    sign = -1;
                    x_sign = 0 - x_sign;
                }

                for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
                {
                    if (decision >= dy)
                    {
                        decision -= dy;
                        curx += x_sign;
                    }
                    if (curx >= clip -> gx_rectangle_left &&
                        curx <= clip -> gx_rectangle_right &&
                        cury >= clip -> gx_rectangle_top &&
                        cury <= clip -> gx_rectangle_bottom)
                    {
                        blend_func(context, curx, cury, linecolor, alpha);
                    }
                }
            }
        }
    }
    else
    {
        /* here if both line ends lie within clipping rectangle, we can
        run a faster inner loop */
        if (dx >= dy)
        {
            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;

                }
                blend_func(context, curx, cury, linecolor, alpha);
                blend_func(context, nextx, nexty, linecolor, alpha);
            }
        }
        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;
                }
                blend_func(context, curx, cury, linecolor, alpha);
                blend_func(context, nextx, nexty, linecolor, alpha);
            }
        }
    }
}

#endif /* GX_BRUSH_ALPHA_SUPPORT */


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			#if defined (GX_BRUSH_ALPHA_SUPPORT)
34			/**************************************************************************/
35			/* */
36			/* FUNCTION RELEASE */
37			/* */
38			/* _gx_display_driver_simple_line_alpha_draw PORTABLE C */
39			/* 6.1 */
40			/* AUTHOR */
41			/* */
42			/* Kenneth Maxwell, Microsoft Corporation */
43			/* */
44			/* DESCRIPTION */
45			/* */
46			/* Generic driver function that handles drawing lines with brush */
47			/* alpha. */
48			/* */
49			/* INPUT */
50			/* */
51			/* context Drawing context */
52			/* xstart x-coord of endpoint */
53			/* ystart y-coord of endpoint */
54			/* xend x-coord of endpoint */
55			/* yend y-coord of endpoint */
56			/* */
57			/* OUTPUT */
58			/* */
59			/* None */
60			/* */
61			/* CALLS */
62			/* */
63			/* GX_ABS Compute the absolute value */
64			/* GX_SWAP_VALUE Swap two values */
65			/* [PIXEL_WRITE] Driver level pixel write */
66			/* routine */
67			/* [gx_display_driver_pixel_blend] Basic display driver pixel */
68			/* blend function */
69			/* */
70			/* CALLED BY */
71			/* */
72			/* GUIX Internal Code */
73			/* */
74			/**************************************************************************/
75		493	VOID _gx_display_driver_simple_line_alpha_draw(GX_DRAW_CONTEXT *context, INT xstart, INT ystart, INT xend, INT yend, GX_UBYTE alpha)
76			{
77			INT curx;
78			INT cury;
79			INT x_sign;
80			INT y_sign;
81			INT decision;
82			INT nextx;
83			INT nexty;
84			GX_POINT end_point;
85			GX_POINT mid_point;
86			GX_RECTANGLE half_rectangle;
87			GX_RECTANGLE half_over;
88			INT sign;
89			INT steps;
90		493	GX_BOOL clipped = GX_TRUE;
91		493	INT dx = GX_ABS(xend - xstart);
92		493	INT dy = GX_ABS(yend - ystart);
93
94		493	GX_RECTANGLE *clip = context -> gx_draw_context_clip;
95		493	GX_COLOR linecolor = context -> gx_draw_context_brush.gx_brush_line_color;
96			VOID (blend_func)(GX_DRAW_CONTEXT context, INT x, INT y, GX_COLOR fcolor, GX_UBYTE alpha);
97
98		493	blend_func = context -> gx_draw_context_display -> gx_display_driver_pixel_blend;
99
100	✓✓	493	if (blend_func == GX_NULL)
101			{
102		25	return;
103			}
104
105	✓✓✓✓ ✓✓✓✓	468	if (((dx >= dy && (xstart > xend)) \|\| ((dy > dx) && ystart > yend)))
106			{
107		206	GX_SWAP_VALS(xend, xstart);
108		206	GX_SWAP_VALS(yend, ystart);
109			}
110		468	x_sign = (xend - xstart) / dx;
111		468	y_sign = (yend - ystart) / dy;
112
113		468	end_point.gx_point_x = (GX_VALUE)xstart;
114		468	end_point.gx_point_y = (GX_VALUE)ystart;
115
116	✓✓	468	if (_gx_utility_rectangle_point_detect(clip, end_point))
117			{
118		276	end_point.gx_point_x = (GX_VALUE)xend;
119		276	end_point.gx_point_y = (GX_VALUE)yend;
120
121	✓✓	276	if (_gx_utility_rectangle_point_detect(clip, end_point))
122			{
123		87	clipped = GX_FALSE;
124			}
125			}
126
127	✓✓	468	if (clipped)
128			{
129			/* here if we must do clipping in the inner loop, because one
130			or both of the end points are outside clipping rectangle */
131
132			/* Calculate the middle point of the line. */
133		381	mid_point.gx_point_x = (GX_VALUE)((xend + xstart) >> 1);
134		381	mid_point.gx_point_y = (GX_VALUE)((yend + ystart) >> 1);
135
136			/* Judge the clip in which side. */
137	✓✓	381	if (_gx_utility_rectangle_point_detect(clip, mid_point))
138			{
139
140			/* the clip in two sides. */
141	✓✓	217	if (dx >= dy)
142			{
143			/* walk out the clipping point. */
144	✓✓	3099	for (curx = xstart, cury = ystart, decision = (dx >> 1); curx < mid_point.gx_point_x;
145		2971	curx++, decision += dy)
146			{
147	✓✓	3096	if (decision >= dx)
148			{
149		1825	decision -= dx;
150		1825	cury += y_sign;
151			}
152
153	✓✓	3096	if (curx >= clip -> gx_rectangle_left &&
154	✓✓	1777	cury >= clip -> gx_rectangle_top &&
155	✓✓	1478	cury <= clip -> gx_rectangle_bottom)
156			{
157		125	break;
158			}
159			}
160	✓✓	8864	for (; curx <= mid_point.gx_point_x;
161		8736	curx++, decision += dy)
162			{
163	✓✓	8736	if (decision >= dx)
164			{
165		4802	decision -= dx;
166		4802	cury += y_sign;
167			}
168
169		8736	blend_func(context, curx, cury, linecolor, alpha);
170			}
171	✓✓	6716	for (nextx = xend, nexty = yend, decision = (dx >> 1); nextx > mid_point.gx_point_x;
172		6588	nextx--, decision += dy)
173			{
174	✓✓	6713	if (decision >= dx)
175			{
176		3339	decision -= dx;
177		3339	nexty -= y_sign;
178			}
179	✓✓	6713	if (nextx <= clip -> gx_rectangle_right &&
180	✓✓	1016	nexty >= clip -> gx_rectangle_top &&
181	✓✓	891	nexty <= clip -> gx_rectangle_bottom)
182			{
183		125	break;
184			}
185			}
186
187	✓✓	5142	for (; nextx > mid_point.gx_point_x;
188		5014	nextx--, decision += dy)
189			{
190	✓✓	5014	if (decision >= dx)
191			{
192		3204	decision -= dx;
193		3204	nexty -= y_sign;
194			}
195		5014	blend_func(context, nextx, nexty, linecolor, alpha);
196			}
197			}
198			else
199			{
200	✓✓	4484	for (nextx = xend, nexty = yend, decision = (dy >> 1); nexty > mid_point.gx_point_y;
201		4395	nexty--, decision += dx)
202			{
203	✓✓	4481	if (decision >= dy)
204			{
205		2301	decision -= dy;
206		2301	nextx -= x_sign;
207			}
208	✓✓	4481	if (nextx >= clip -> gx_rectangle_left &&
209	✓✓	4252	nextx <= clip -> gx_rectangle_right &&
210	✓✓	1674	nexty <= clip -> gx_rectangle_bottom)
211			{
212		86	break;
213			}
214			}
215
216	✓✓	2689	for (; nexty > mid_point.gx_point_y;
217		2600	nexty--, decision += dx)
218			{
219	✓✓	2600	if (decision >= dy)
220			{
221		1261	decision -= dy;
222		1261	nextx -= x_sign;
223			}
224		2600	blend_func(context, nextx, nexty, linecolor, alpha);
225			}
226
227			/* walk out the clipping point. */
228	✓✓	2748	for (curx = xstart, cury = ystart, decision = (dy >> 1); cury < mid_point.gx_point_y;
229		2659	cury++, decision += dx)
230			{
231	✓✓	2745	if (decision >= dy)
232			{
233		1461	decision -= dy;
234		1461	curx += x_sign;
235			}
236
237	✓✓	2745	if (curx >= clip -> gx_rectangle_left &&
238	✓✓	2601	curx <= clip -> gx_rectangle_right &&
239	✓✓	297	cury >= clip -> gx_rectangle_top)
240			{
241		86	break;
242			}
243			}
244	✓✓	4502	for (; cury <= mid_point.gx_point_y;
245		4413	cury++, decision += dx)
246			{
247	✓✓	4413	if (decision >= dy)
248			{
249		2166	decision -= dy;
250		2166	curx += x_sign;
251			}
252		4413	blend_func(context, curx, cury, linecolor, alpha);
253			}
254			}
255			}
256			else
257			{
258			/* The clip stay at one side. */
259	✓✓	164	if (dx >= dy)
260			{
261		82	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
262		82	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
263	✓✓	82	if (y_sign == 1)
264			{
265		40	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
266		40	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
267			}
268			else
269			{
270		42	half_rectangle.gx_rectangle_top = mid_point.gx_point_y;
271		42	half_rectangle.gx_rectangle_bottom = (GX_VALUE)ystart;
272			}
273
274	✓✓	82	if (_gx_utility_rectangle_overlap_detect(clip, &half_rectangle, &half_over))
275			{
276		62	curx = xstart;
277		62	cury = ystart;
278		62	steps = mid_point.gx_point_x - curx + 1;
279		62	sign = 1;
280			}
281			else
282			{
283		20	curx = xend;
284		20	cury = yend;
285		20	steps = xend - mid_point.gx_point_x;
286		20	sign = -1;
287		20	y_sign = 0 - y_sign;
288			}
289	✓✓	8877	for (decision = (dx >> 1); steps > 0; curx += sign, decision += dy, steps--)
290			{
291	✓✓	8795	if (decision >= dx)
292			{
293		4182	decision -= dx;
294		4182	cury += y_sign;
295			}
296
297	✓✓	8795	if (curx >= clip -> gx_rectangle_left &&
298	✓✓	8748	curx <= clip -> gx_rectangle_right &&
299	✓✓	5894	cury >= clip -> gx_rectangle_top &&
300	✓✓	5766	cury <= clip -> gx_rectangle_bottom)
301			{
302		5613	blend_func(context, curx, cury, linecolor, alpha);
303			}
304			}
305			}
306			else
307			{
308		82	half_rectangle.gx_rectangle_top = (GX_VALUE)ystart;
309		82	half_rectangle.gx_rectangle_bottom = mid_point.gx_point_y;
310	✓✓	82	if (x_sign == 1)
311			{
312		42	half_rectangle.gx_rectangle_right = mid_point.gx_point_x;
313		42	half_rectangle.gx_rectangle_left = (GX_VALUE)xstart;
314			}
315			else
316			{
317		40	half_rectangle.gx_rectangle_right = (GX_VALUE)xstart;
318		40	half_rectangle.gx_rectangle_left = mid_point.gx_point_x;
319			}
320
321	✓✓	82	if (_gx_utility_rectangle_overlap_detect(clip, &half_rectangle, &half_over))
322			{
323		42	curx = xstart;
324		42	cury = ystart;
325		42	steps = mid_point.gx_point_y - cury + 1;
326		42	sign = 1;
327			}
328			else
329			{
330		40	curx = xend;
331		40	cury = yend;
332		40	steps = yend - mid_point.gx_point_y;
333		40	sign = -1;
334		40	x_sign = 0 - x_sign;
335			}
336
337	✓✓	7702	for (decision = (dy >> 1); steps > 0; cury += sign, decision += dx, steps--)
338			{
339	✓✓	7620	if (decision >= dy)
340			{
341		4010	decision -= dy;
342		4010	curx += x_sign;
343			}
344	✓✓	7620	if (curx >= clip -> gx_rectangle_left &&
345	✓✓	7599	curx <= clip -> gx_rectangle_right &&
346	✓✓	5332	cury >= clip -> gx_rectangle_top &&
347	✓✓	5263	cury <= clip -> gx_rectangle_bottom)
348			{
349		3982	blend_func(context, curx, cury, linecolor, alpha);
350			}
351			}
352			}
353			}
354			}
355			else
356			{
357			/* here if both line ends lie within clipping rectangle, we can
358			run a faster inner loop */
359	✓✓	87	if (dx >= dy)
360			{
361		46	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
362	✓✓	4051	decision = (dx >> 1); curx <= nextx; curx++, nextx--,
363		4005	decision += dy)
364			{
365
366	✓✓	4005	if (decision >= dx)
367			{
368		2196	decision -= dx;
369		2196	cury += y_sign;
370		2196	nexty -= y_sign;
371
372			}
373		4005	blend_func(context, curx, cury, linecolor, alpha);
374		4005	blend_func(context, nextx, nexty, linecolor, alpha);
375			}
376			}
377			else
378			{
379
380		41	for (curx = xstart, cury = ystart, nextx = xend, nexty = yend,
381	✓✓	3697	decision = (dy >> 1); cury <= nexty; cury++, nexty--,
382		3656	decision += dx)
383			{
384	✓✓	3656	if (decision >= dy)
385			{
386		1822	decision -= dy;
387		1822	curx += x_sign;
388		1822	nextx -= x_sign;
389			}
390		3656	blend_func(context, curx, cury, linecolor, alpha);
391		3656	blend_func(context, nextx, nexty, linecolor, alpha);
392			}
393			}
394			}
395			}
396
397			#endif /* GX_BRUSH_ALPHA_SUPPORT */