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Diffstat (limited to 'src/video/SDL_drawline.c')
-rw-r--r--src/video/SDL_drawline.c167
1 files changed, 123 insertions, 44 deletions
diff --git a/src/video/SDL_drawline.c b/src/video/SDL_drawline.c
index 3d572ac6..aa185b34 100644
--- a/src/video/SDL_drawline.c
+++ b/src/video/SDL_drawline.c
@@ -23,17 +23,116 @@
#include "SDL_draw.h"
+static void
+SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+ SDL_bool draw_end)
+{
+ if (y1 == y2) {
+ HLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
+ } else if (x1 == x2) {
+ VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
+ } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+ DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
+ } else {
+ BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
+ }
+}
+
+static void
+SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+ SDL_bool draw_end)
+{
+ if (y1 == y2) {
+ HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+ } else if (x1 == x2) {
+ VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+ } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+ DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
+ } else {
+ Uint8 _r, _g, _b, _a;
+ const SDL_PixelFormat * fmt = dst->format;
+ SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
+ if (fmt->Rmask == 0x7C00) {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
+ draw_end);
+ } else if (fmt->Rmask == 0xF800) {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
+ draw_end);
+ } else {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
+ draw_end);
+ }
+ }
+}
+
+static void
+SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
+ SDL_bool draw_end)
+{
+ if (y1 == y2) {
+ HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+ } else if (x1 == x2) {
+ VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+ } else if (ABS(x1 - x2) == ABS(y1 - y2)) {
+ DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
+ } else {
+ Uint8 _r, _g, _b, _a;
+ const SDL_PixelFormat * fmt = dst->format;
+ SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
+ if (fmt->Rmask == 0x00FF0000) {
+ if (!fmt->Amask) {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
+ draw_end);
+ } else {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
+ draw_end);
+ }
+ } else {
+ AALINE(x1, y1, x2, y2,
+ DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
+ draw_end);
+ }
+ }
+}
+
+typedef void (*DrawLineFunc) (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)
+{
+ switch (fmt->BytesPerPixel) {
+ case 1:
+ if (fmt->BitsPerPixel < 8) {
+ break;
+ }
+ return SDL_DrawLine1;
+ case 2:
+ return SDL_DrawLine2;
+ case 4:
+ return SDL_DrawLine4;
+ }
+ return NULL;
+}
int
SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
{
+ DrawLineFunc func;
+
if (!dst) {
- SDL_SetError("Passed NULL destination surface");
+ SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
return -1;
}
- /* This function doesn't work on surfaces < 8 bpp */
- if (dst->format->BitsPerPixel < 8) {
+ func = SDL_CalculateDrawLineFunc(dst->format);
+ if (!func) {
SDL_SetError("SDL_DrawLine(): Unsupported surface format");
return -1;
}
@@ -41,23 +140,10 @@ SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
/* Perform clipping */
/* FIXME: We don't actually want to clip, as it may change line slope */
if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
- return (0);
+ return 0;
}
- switch (dst->format->BytesPerPixel) {
- case 1:
- DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL1, SDL_TRUE);
- break;
- case 2:
- DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL2, SDL_TRUE);
- break;
- case 3:
- SDL_Unsupported();
- return -1;
- case 4:
- DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL4, SDL_TRUE);
- break;
- }
+ func(dst, x1, y1, x2, y2, color, SDL_TRUE);
return 0;
}
@@ -66,27 +152,27 @@ SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
Uint32 color)
{
int i;
+ int x1, y1;
+ int x2, y2;
+ SDL_bool draw_end;
+ DrawLineFunc func;
if (!dst) {
- SDL_SetError("Passed NULL destination surface");
+ SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
return -1;
}
- /* This function doesn't work on surfaces < 8 bpp */
- if (dst->format->BitsPerPixel < 8) {
- SDL_SetError("SDL_DrawLine(): Unsupported surface format");
+ func = SDL_CalculateDrawLineFunc(dst->format);
+ if (!func) {
+ SDL_SetError("SDL_DrawLines(): Unsupported surface format");
return -1;
}
- if (count < 2) {
- return 0;
- }
-
for (i = 1; i < count; ++i) {
- int x1 = points[i-1].x;
- int y1 = points[i-1].y;
- int x2 = points[i].x;
- int y2 = points[i].y;
+ x1 = points[i-1].x;
+ y1 = points[i-1].y;
+ x2 = points[i].x;
+ y2 = points[i].y;
/* Perform clipping */
/* FIXME: We don't actually want to clip, as it may change line slope */
@@ -94,20 +180,13 @@ SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
continue;
}
- switch (dst->format->BytesPerPixel) {
- case 1:
- DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL1, SDL_TRUE);
- break;
- case 2:
- DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL2, SDL_TRUE);
- break;
- case 3:
- SDL_Unsupported();
- return -1;
- case 4:
- DRAWLINE(x1, y1, x2, y2, DRAW_FASTSETPIXEL4, SDL_TRUE);
- break;
- }
+ /* Draw the end if it was clipped */
+ draw_end = (x2 != points[i].x || y2 != points[i].y);
+
+ func(dst, x1, y1, x2, y2, color, draw_end);
+ }
+ if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
+ SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
}
return 0;
}
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