SDL  2.0
Typedefs | Functions
SDL_drawline.c File Reference
#include "../../SDL_internal.h"
#include "SDL_draw.h"
#include "SDL_drawline.h"
#include "SDL_drawpoint.h"
+ Include dependency graph for SDL_drawline.c:

Go to the source code of this file.

Typedefs

typedef void(* DrawLineFunc) (SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
 

Functions

static void SDL_DrawLine1 (SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
 
static void SDL_DrawLine2 (SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
 
static void SDL_DrawLine4 (SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)
 
static DrawLineFunc SDL_CalculateDrawLineFunc (const SDL_PixelFormat *fmt)
 
int SDL_DrawLine (SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color)
 
int SDL_DrawLines (SDL_Surface *dst, const SDL_Point *points, int count, Uint32 color)
 

Typedef Documentation

◆ DrawLineFunc

typedef void(* DrawLineFunc) (SDL_Surface *dst, int x1, int y1, int x2, int y2, Uint32 color, SDL_bool draw_end)

Definition at line 120 of file SDL_drawline.c.

Function Documentation

◆ SDL_CalculateDrawLineFunc()

static DrawLineFunc SDL_CalculateDrawLineFunc ( const SDL_PixelFormat *  fmt)
static

Definition at line 125 of file SDL_drawline.c.

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 }
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_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
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
NULL
#define NULL
Definition: begin_code.h:163
SDL_PixelFormat::BytesPerPixel
Uint8 BytesPerPixel
Definition: SDL_pixels.h:329
SDL_PixelFormat::BitsPerPixel
Uint8 BitsPerPixel
Definition: SDL_pixels.h:328

References SDL_PixelFormat::BitsPerPixel, SDL_PixelFormat::BytesPerPixel, NULL, SDL_DrawLine1(), SDL_DrawLine2(), and SDL_DrawLine4().

Referenced by SDL_DrawLine(), and SDL_DrawLines().

◆ SDL_DrawLine()

int SDL_DrawLine ( SDL_Surface *  dst,
int  x1,
int  y1,
int  x2,
int  y2,
Uint32  color 
)

Definition at line 142 of file SDL_drawline.c.

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 }
SDL_CalculateDrawLineFunc
static DrawLineFunc SDL_CalculateDrawLineFunc(const SDL_PixelFormat *fmt)
Definition: SDL_drawline.c:125
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
SDL_SetError
#define SDL_SetError
Definition: SDL_dynapi_overrides.h:30
SDL_IntersectRectAndLine
#define SDL_IntersectRectAndLine
Definition: SDL_dynapi_overrides.h:297
func
GLenum func
Definition: SDL_opengl_glext.h:660
y2
GLfixed GLfixed GLfixed y2
Definition: SDL_opengl_glext.h:4586
y1
GLfixed y1
Definition: SDL_opengl_glext.h:4586
color
GLuint color
Definition: SDL_opengl_glext.h:1151
x1
GLuint GLfloat GLfloat GLfloat x1
Definition: SDL_opengl_glext.h:8586
x2
GLfixed GLfixed x2
Definition: SDL_opengl_glext.h:4586
dst
GLenum GLenum dst
Definition: SDL_opengl_glext.h:1740
SDL_TRUE
@ SDL_TRUE
Definition: SDL_stdinc.h:170

References SDL_CalculateDrawLineFunc(), SDL_IntersectRectAndLine, SDL_SetError, and SDL_TRUE.

◆ SDL_DrawLine1()

static void SDL_DrawLine1 ( SDL_Surface *  dst,
int  x1,
int  y1,
int  x2,
int  y2,
Uint32  color,
SDL_bool  draw_end 
)
static

Definition at line 31 of file SDL_drawline.c.

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 }
BLINE
#define BLINE(x1, y1, x2, y2, op, draw_end)
Definition: SDL_draw.h:431
ABS
#define ABS(_x)
Definition: SDL_draw.h:349
DLINE
#define DLINE(type, op, draw_end)
Definition: SDL_draw.h:396
DRAW_FASTSETPIXEL1
#define DRAW_FASTSETPIXEL1
Definition: SDL_draw.h:34
DRAW_FASTSETPIXELXY1
#define DRAW_FASTSETPIXELXY1(x, y)
Definition: SDL_draw.h:42
VLINE
#define VLINE(type, op, draw_end)
Definition: SDL_draw.h:374
SDL_memset
#define SDL_memset
Definition: SDL_dynapi_overrides.h:386
length
GLuint GLsizei GLsizei * length
Definition: SDL_opengl_glext.h:672
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:185
if
set set set set set set set macro pixldst1 abits if abits op else op endif endm macro pixldst2 abits if abits op else op endif endm macro pixldst4 abits if abits op else op endif endm macro pixldst0 abits op endm macro pixldst3 mem_operand op endm macro pixldst30 mem_operand op endm macro pixldst abits if abits elseif abits elseif abits elseif abits elseif abits pixldst0 abits else pixldst0 abits pixldst0 abits pixldst0 abits pixldst0 abits endif elseif abits else pixldst0 abits pixldst0 abits endif elseif abits else error unsupported bpp *numpix else pixst endif endm macro pixld1_s mem_operand if asr adds SRC_WIDTH_FIXED bpl add asl mov asr adds SRC_WIDTH_FIXED bpl add asl mov asr adds SRC_WIDTH_FIXED bpl add asl mov asr adds SRC_WIDTH_FIXED bpl add asl elseif asr adds SRC_WIDTH_FIXED bpl add asl mov asr adds SRC_WIDTH_FIXED bpl add asl else error unsupported endif endm macro pixld2_s mem_operand if mov asr add asl add asl mov asr sub UNIT_X add asl mov asr add asl add asl mov asr add UNIT_X add asl else pixld1_s mem_operand pixld1_s mem_operand endif endm macro pixld0_s mem_operand if asr adds SRC_WIDTH_FIXED bpl add asl elseif asr adds SRC_WIDTH_FIXED bpl add asl endif endm macro pixld_s_internal mem_operand if mem_operand pixld2_s mem_operand pixdeinterleave basereg elseif mem_operand elseif mem_operand elseif mem_operand elseif mem_operand pixld0_s mem_operand else pixld0_s mem_operand pixld0_s mem_operand pixld0_s mem_operand pixld0_s mem_operand endif elseif mem_operand else pixld0_s mem_operand pixld0_s mem_operand endif elseif mem_operand else error unsupported mem_operand if bpp mem_operand endif endm macro vuzp8 reg2 vuzp d d &reg2 endm macro vzip8 reg2 vzip d d &reg2 endm macro pixdeinterleave basereg basereg basereg basereg basereg endif endm macro pixinterleave basereg basereg basereg basereg basereg endif endm macro PF boost_increment endif if endif PF tst PF addne PF subne PF cmp ORIG_W if endif if endif if endif PF subge ORIG_W PF subges if endif if endif if endif endif endm macro cache_preload_simple endif if dst_r_bpp pld[DST_R, #(PREFETCH_DISTANCE_SIMPLE *dst_r_bpp/8)] endif if mask_bpp pld if[MASK, #(PREFETCH_DISTANCE_SIMPLE *mask_bpp/8)] endif endif endm macro fetch_mask_pixblock pixld mask_basereg pixblock_size MASK endm macro ensure_destination_ptr_alignment process_pixblock_tail_head if beq irp skip1(dst_w_bpp<=(lowbit *8)) &&((lowbit *8)<(pixblock_size *dst_w_bpp)) .if lowbit< 16 tst DST_R
Definition: pixman-arm-neon-asm.h:469

References ABS, BLINE, DLINE, DRAW_FASTSETPIXEL1, DRAW_FASTSETPIXELXY1, if, SDL_memset, and VLINE.

Referenced by SDL_CalculateDrawLineFunc().

◆ SDL_DrawLine2()

static void SDL_DrawLine2 ( SDL_Surface *  dst,
int  x1,
int  y1,
int  x2,
int  y2,
Uint32  color,
SDL_bool  draw_end 
)
static

Definition at line 59 of file SDL_drawline.c.

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 }
HLINE
#define HLINE(type, op, draw_end)
Definition: SDL_draw.h:352
DRAW_FASTSETPIXEL2
#define DRAW_FASTSETPIXEL2
Definition: SDL_draw.h:35
DRAW_SETPIXELXY2_BLEND_RGB
#define DRAW_SETPIXELXY2_BLEND_RGB(x, y)
Definition: SDL_draw.h:282
AALINE
#define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end)
Definition: SDL_draw.h:593
DRAW_FASTSETPIXELXY2
#define DRAW_FASTSETPIXELXY2(x, y)
Definition: SDL_draw.h:43
DRAW_SETPIXELXY_BLEND_RGB565
#define DRAW_SETPIXELXY_BLEND_RGB565(x, y)
Definition: SDL_draw.h:165
DRAW_SETPIXELXY_BLEND_RGB555
#define DRAW_SETPIXELXY_BLEND_RGB555(x, y)
Definition: SDL_draw.h:127
SDL_GetRGBA
#define SDL_GetRGBA
Definition: SDL_dynapi_overrides.h:289
Uint16
uint16_t Uint16
Definition: SDL_stdinc.h:197
SDL_PixelFormat
Definition: SDL_pixels.h:325
SDL_PixelFormat::Rmask
Uint32 Rmask
Definition: SDL_pixels.h:331
SDL_PixelFormat::format
Uint32 format
Definition: SDL_pixels.h:326

References AALINE, ABS, DLINE, DRAW_FASTSETPIXEL2, DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB, DRAW_SETPIXELXY_BLEND_RGB555, DRAW_SETPIXELXY_BLEND_RGB565, SDL_PixelFormat::format, HLINE, SDL_PixelFormat::Rmask, SDL_GetRGBA, and VLINE.

Referenced by SDL_CalculateDrawLineFunc().

◆ SDL_DrawLine4()

static void SDL_DrawLine4 ( SDL_Surface *  dst,
int  x1,
int  y1,
int  x2,
int  y2,
Uint32  color,
SDL_bool  draw_end 
)
static

Definition at line 89 of file SDL_drawline.c.

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 }
DRAW_SETPIXELXY_BLEND_RGB888
#define DRAW_SETPIXELXY_BLEND_RGB888(x, y)
Definition: SDL_draw.h:203
DRAW_FASTSETPIXELXY4
#define DRAW_FASTSETPIXELXY4(x, y)
Definition: SDL_draw.h:44
DRAW_SETPIXELXY_BLEND_ARGB8888
#define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y)
Definition: SDL_draw.h:241
DRAW_SETPIXELXY4_BLEND_RGB
#define DRAW_SETPIXELXY4_BLEND_RGB(x, y)
Definition: SDL_draw.h:285
DRAW_FASTSETPIXEL4
#define DRAW_FASTSETPIXEL4
Definition: SDL_draw.h:36
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:209
SDL_PixelFormat::Amask
Uint32 Amask
Definition: SDL_pixels.h:334

References AALINE, ABS, SDL_PixelFormat::Amask, DLINE, DRAW_FASTSETPIXEL4, DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB, DRAW_SETPIXELXY_BLEND_ARGB8888, DRAW_SETPIXELXY_BLEND_RGB888, SDL_PixelFormat::format, HLINE, SDL_PixelFormat::Rmask, SDL_GetRGBA, and VLINE.

Referenced by SDL_CalculateDrawLineFunc().

◆ SDL_DrawLines()

int SDL_DrawLines ( SDL_Surface *  dst,
const SDL_Point *  points,
int  count,
Uint32  color 
)

Definition at line 166 of file SDL_drawline.c.

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 }
SDL_DrawPoint
int SDL_DrawPoint(SDL_Surface *dst, int x, int y, Uint32 color)
Definition: SDL_drawpoint.c:30
y
GLint GLint GLint GLint GLint GLint y
Definition: SDL_opengl.h:1574
count
GLuint GLuint GLsizei count
Definition: SDL_opengl.h:1571
x
GLint GLint GLint GLint GLint x
Definition: SDL_opengl.h:1574
points
GLfixed GLfixed GLint GLint GLfixed points
Definition: SDL_opengl_glext.h:4561
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:168
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50

References i, SDL_CalculateDrawLineFunc(), SDL_DrawPoint(), SDL_IntersectRectAndLine, and SDL_SetError.

Referenced by SW_RunCommandQueue().