zenilib: zenilib/jni/external/sdl/src/render/software/SDL_drawline.c Source File

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SDL_drawline.c
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1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "SDL_config.h"
22
23 #if !SDL_RENDER_DISABLED
24
25 #include "SDL_draw.h"
26 #include "SDL_drawline.h"
27 #include "SDL_drawpoint.h"
28
29
30 static void
31 SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
32 SDL_bool draw_end)
33 {
34 if (y1 == y2) {
35 int length;
36 int pitch = (dst->pitch / dst->format->BytesPerPixel);
37 Uint8 *pixel;
38 if (x1 <= x2) {
39 pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
40 length = draw_end ? (x2-x1+1) : (x2-x1);
41 } else {
42 pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
43 if (!draw_end) {
44 ++pixel;
45 }
46 length = draw_end ? (x1-x2+1) : (x1-x2);
47 }
48 SDL_memset(pixel, color, length);
49 } else if (x1 == x2) {
50 VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
51 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
52 DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
53 } else {
54 BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
55 }
56 }
57
58 static void
59 SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
60 SDL_bool draw_end)
61 {
62 if (y1 == y2) {
63 HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
64 } else if (x1 == x2) {
65 VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
66 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
67 DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
68 } else {
69 Uint8 _r, _g, _b, _a;
70 const SDL_PixelFormat * fmt = dst->format;
71 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
72 if (fmt->Rmask == 0x7C00) {
73 AALINE(x1, y1, x2, y2,
74 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
75 draw_end);
76 } else if (fmt->Rmask == 0xF800) {
77 AALINE(x1, y1, x2, y2,
78 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
79 draw_end);
80 } else {
81 AALINE(x1, y1, x2, y2,
82 DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
83 draw_end);
84 }
85 }
86 }
87
88 static void
89 SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
90 SDL_bool draw_end)
91 {
92 if (y1 == y2) {
93 HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
94 } else if (x1 == x2) {
95 VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
96 } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
97 DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
98 } else {
99 Uint8 _r, _g, _b, _a;
100 const SDL_PixelFormat * fmt = dst->format;
101 SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
102 if (fmt->Rmask == 0x00FF0000) {
103 if (!fmt->Amask) {
104 AALINE(x1, y1, x2, y2,
105 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
106 draw_end);
107 } else {
108 AALINE(x1, y1, x2, y2,
109 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
110 draw_end);
111 }
112 } else {
113 AALINE(x1, y1, x2, y2,
114 DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
115 draw_end);
116 }
117 }
118 }
119
120 typedef void (*DrawLineFunc) (SDL_Surface * dst,
121 int x1, int y1, int x2, int y2,
122 Uint32 color, SDL_bool draw_end);
123
124 static DrawLineFunc
125 SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
126 {
127 switch (fmt->BytesPerPixel) {
128 case 1:
129 if (fmt->BitsPerPixel < 8) {
130 break;
131 }
132 return SDL_DrawLine1;
133 case 2:
134 return SDL_DrawLine2;
135 case 4:
136 return SDL_DrawLine4;
137 }
138 return NULL;
139 }
140
141 int
142 SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
143 {
144 DrawLineFunc func;
145
146 if (!dst) {
147 return SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
148 }
149
150 func = SDL_CalculateDrawLineFunc(dst->format);
151 if (!func) {
152 return SDL_SetError("SDL_DrawLine(): Unsupported surface format");
153 }
154
155 /* Perform clipping */
156 /* FIXME: We don't actually want to clip, as it may change line slope */
157 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
158 return 0;
159 }
160
161 func(dst, x1, y1, x2, y2, color, SDL_TRUE);
162 return 0;
163 }
164
165 int
166 SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
167 Uint32 color)
168 {
169 int i;
170 int x1, y1;
171 int x2, y2;
172 SDL_bool draw_end;
173 DrawLineFunc func;
174
175 if (!dst) {
176 return SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
177 }
178
179 func = SDL_CalculateDrawLineFunc(dst->format);
180 if (!func) {
181 return SDL_SetError("SDL_DrawLines(): Unsupported surface format");
182 }
183
184 for (i = 1; i < count; ++i) {
185 x1 = points[i-1].x;
186 y1 = points[i-1].y;
187 x2 = points[i].x;
188 y2 = points[i].y;
189
190 /* Perform clipping */
191 /* FIXME: We don't actually want to clip, as it may change line slope */
192 if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
193 continue;
194 }
195
196 /* Draw the end if it was clipped */
197 draw_end = (x2 != points[i].x || y2 != points[i].y);
198
199 func(dst, x1, y1, x2, y2, color, draw_end);
200 }
201 if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
202 SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
203 }
204 return 0;
205 }
206
207 #endif /* !SDL_RENDER_DISABLED */
208
209 /* vi: set ts=4 sw=4 expandtab: */
SDL_IntersectRectAndLine
DECLSPEC SDL_bool SDLCALL SDL_IntersectRectAndLine(const SDL_Rect *rect, int *X1, int *Y1, int *X2, int *Y2)
Calculate the intersection of a rectangle and line segment.
Definition: SDL_rect.c:316
SDL_DrawLines
int SDL_DrawLines(SDL_Surface *dst, const SDL_Point *points, int count, Uint32 color)
Definition: SDL_drawline.c:166
SDL_DrawLine4
static void SDL_DrawLine4(SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
Definition: SDL_drawline.c:89
void
GLvoid **typedef void(GLAPIENTRY *PFNGLGETVERTEXATTRIBDVPROC)(GLuint
Definition: glew.h:1824
color
GLuint color
Definition: glew.h:7185
NULL
#define NULL
Definition: ftobjs.h:61
SDL_PixelFormat::BytesPerPixel
Uint8 BytesPerPixel
Definition: SDL_pixels.h:277
BLINE
#define BLINE(x1, y1, x2, y2, op, draw_end)
Definition: SDL_draw.h:374
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:116
DRAW_FASTSETPIXELXY1
#define DRAW_FASTSETPIXELXY1(x, y)
Definition: SDL_draw.h:42
DRAW_FASTSETPIXELXY4
#define DRAW_FASTSETPIXELXY4(x, y)
Definition: SDL_draw.h:44
SDL_TRUE
Definition: SDL_stdinc.h:119
DRAW_SETPIXELXY2_BLEND_RGB
#define DRAW_SETPIXELXY2_BLEND_RGB(x, y)
Definition: SDL_draw.h:238
VLINE
#define VLINE(type, op, draw_end)
Definition: SDL_draw.h:317
x
EGLSurface EGLint x
Definition: eglext.h:293
SDL_Point
The structure that defines a point.
Definition: SDL_rect.h:47
SDL_Surface
A collection of pixels used in software blitting.
Definition: SDL_surface.h:69
DrawLineFunc
void(* DrawLineFunc)(SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
Definition: SDL_drawline.c:120
ABS
#define ABS(_x)
Definition: SDL_gamecontroller.c:34
DLINE
#define DLINE(type, op, draw_end)
Definition: SDL_draw.h:339
HLINE
#define HLINE(type, op, draw_end)
Definition: SDL_draw.h:295
if
if(!yyg->yy_init)
Definition: glslang_lex.cpp:1037
func
GLenum func
Definition: SDL_opengl.h:5654
y1
GLuint GLfloat GLfloat GLfloat GLfloat y1
Definition: glew.h:11582
SDL_drawline.h
y2
GLfixed GLfixed GLfixed y2
Definition: glext.h:4559
SDL_DrawLine2
static void SDL_DrawLine2(SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
Definition: SDL_drawline.c:59
SDL_config.h
Uint32
uint32_t Uint32
An unsigned 32-bit integer type.
Definition: SDL_stdinc.h:145
SDL_Point::x
int x
Definition: SDL_rect.h:49
DRAW_FASTSETPIXEL1
#define DRAW_FASTSETPIXEL1
Definition: SDL_draw.h:34
dst
GLenum GLenum dst
Definition: glew.h:2396
length
GLsizei GLsizei * length
Definition: gl2ext.h:792
SDL_Point::y
int y
Definition: SDL_rect.h:50
SDL_Surface::pixels
void * pixels
Definition: SDL_surface.h:75
DRAW_SETPIXELXY_BLEND_RGB888
#define DRAW_SETPIXELXY_BLEND_RGB888(x, y)
Definition: SDL_draw.h:173
SDL_PixelFormat::BitsPerPixel
Uint8 BitsPerPixel
Definition: SDL_pixels.h:276
SDL_drawpoint.h
count
GLint GLsizei count
Definition: gl2ext.h:1011
DRAW_SETPIXELXY_BLEND_RGB555
#define DRAW_SETPIXELXY_BLEND_RGB555(x, y)
Definition: SDL_draw.h:111
SDL_memset
DECLSPEC void *SDLCALL SDL_memset(void *dst, int c, size_t len)
Definition: SDL_string.c:261
SDL_SetError
DECLSPEC int SDLCALL SDL_SetError(const char *fmt,...)
Definition: SDL_error.c:53
DRAW_SETPIXELXY4_BLEND_RGB
#define DRAW_SETPIXELXY4_BLEND_RGB(x, y)
Definition: SDL_draw.h:241
SDL_Surface::clip_rect
SDL_Rect clip_rect
Definition: SDL_surface.h:85
x1
GLuint GLfloat GLfloat GLfloat x1
Definition: glew.h:11582
DRAW_FASTSETPIXEL4
#define DRAW_FASTSETPIXEL4
Definition: SDL_draw.h:36
y
EGLSurface EGLint EGLint y
Definition: eglext.h:293
DRAW_FASTSETPIXELXY2
#define DRAW_FASTSETPIXELXY2(x, y)
Definition: SDL_draw.h:43
SDL_Surface::format
SDL_PixelFormat * format
Definition: SDL_surface.h:72
SDL_GetRGBA
DECLSPEC void SDLCALL SDL_GetRGBA(Uint32 pixel, const SDL_PixelFormat *format, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a)
Get the RGBA components from a pixel of the specified format.
Definition: SDL_pixels.c:849
SDL_PixelFormat::Rmask
Uint32 Rmask
Definition: SDL_pixels.h:279
AALINE
#define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end)
Definition: SDL_draw.h:546
Uint8
uint8_t Uint8
An unsigned 8-bit integer type.
Definition: SDL_stdinc.h:129
SDL_PixelFormat
Definition: SDL_pixels.h:272
x2
GLfixed GLfixed x2
Definition: glext.h:4559
SDL_Surface::pitch
int pitch
Definition: SDL_surface.h:74
SDL_CalculateDrawLineFunc
static DrawLineFunc SDL_CalculateDrawLineFunc(const SDL_PixelFormat *fmt)
Definition: SDL_drawline.c:125
Uint16
uint16_t Uint16
An unsigned 16-bit integer type.
Definition: SDL_stdinc.h:137
points
GLuint GLdouble GLdouble GLint GLint const GLdouble * points
Definition: glew.h:3337
SDL_PixelFormat::Amask
Uint32 Amask
Definition: SDL_pixels.h:282
DRAW_SETPIXELXY_BLEND_RGB565
#define DRAW_SETPIXELXY_BLEND_RGB565(x, y)
Definition: SDL_draw.h:142
DRAW_FASTSETPIXEL2
#define DRAW_FASTSETPIXEL2
Definition: SDL_draw.h:35
i
int i
Definition: pngrutil.c:1377
SDL_DrawLine
int SDL_DrawLine(SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color)
Definition: SDL_drawline.c:142
SDL_draw.h
DRAW_SETPIXELXY_BLEND_ARGB8888
#define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y)
Definition: SDL_draw.h:204
SDL_DrawPoint
int SDL_DrawPoint(SDL_Surface *dst, int x, int y, Uint32 color)
Definition: SDL_drawpoint.c:30
SDL_DrawLine1
static void SDL_DrawLine1(SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
Definition: SDL_drawline.c:31