diff src/video/SDL_drawpoint.c @ 3536:0267b8b1595c

Added interfaces for batch drawing of points, lines and rects: SDL_DrawPoints() SDL_BlendPoints() SDL_BlendLines() SDL_DrawLines() SDL_FillRects() SDL_BlendRects() SDL_RenderPoints() SDL_RenderLines() SDL_RenderRects() Renamed SDL_RenderFill() to SDL_RenderRect()
author Sam Lantinga <slouken@libsdl.org>
date Wed, 09 Dec 2009 15:56:56 +0000
parents 210e209b87cc
children f638ded38b8a
line wrap: on
line diff
--- a/src/video/SDL_drawpoint.c	Mon Dec 07 10:08:24 2009 +0000
+++ b/src/video/SDL_drawpoint.c	Wed Dec 09 15:56:56 2009 +0000
@@ -27,10 +27,15 @@
 int
 SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
 {
+    if (!dst) {
+        SDL_SetError("Passed NULL destination surface");
+        return -1;
+    }
+
     /* This function doesn't work on surfaces < 8 bpp */
     if (dst->format->BitsPerPixel < 8) {
         SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
-        return (-1);
+        return -1;
     }
 
     /* Perform clipping */
@@ -57,4 +62,55 @@
     return 0;
 }
 
+int
+SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
+               Uint32 color)
+{
+    int minx, miny;
+    int maxx, maxy;
+    int i;
+    int x, y;
+
+    if (!dst) {
+        SDL_SetError("Passed NULL destination surface");
+        return -1;
+    }
+
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
+        return -1;
+    }
+
+    minx = dst->clip_rect.x;
+    maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
+    miny = dst->clip_rect.y;
+    maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
+
+    for (i = 0; i < count; ++i) {
+        x = points[i].x;
+        y = points[i].y;
+
+        if (x < minx || x > maxx || y < miny || y > maxy) {
+            continue;
+        }
+
+        switch (dst->format->BytesPerPixel) {
+        case 1:
+            DRAW_FASTSETPIXEL1(x, y);
+            break;
+        case 2:
+            DRAW_FASTSETPIXEL2(x, y);
+            break;
+        case 3:
+            SDL_Unsupported();
+            return -1;
+        case 4:
+            DRAW_FASTSETPIXEL4(x, y);
+            break;
+        }
+    }
+    return 0;
+}
+
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