Added stubs for software implementations of blending fills and line drawing

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403350

include/SDL_surface.h

@@ -365,6 +365,23 @@ extern DECLSPEC void SDLCALL SDL_GetClipRect(SDL_Surface * surface,
 extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface
     (SDL_Surface * src, SDL_PixelFormat * fmt, Uint32 flags);
 
+/*
+ * This function draws a line with 'color'
+ * The color should be a pixel of the format used by the surface, and 
+ * can be generated by the SDL_MapRGB() function.
+ * This function returns 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_DrawLine
+    (SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color);
+
+/*
+ * This function blends an RGBA value along a line
+ * This function returns 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_BlendLine
+    (SDL_Surface * dst, int x1, int y1, int x2, int y2, int blendMode,
+     Uint8 r, Uint8 g, Uint8 b, Uint8 a);
+
 /*
  * This function performs a fast fill of the given rectangle with 'color'
  * The given rectangle is clipped to the destination surface clip area
@@ -377,6 +394,17 @@ extern DECLSPEC SDL_Surface *SDLCALL SDL_ConvertSurface
 extern DECLSPEC int SDLCALL SDL_FillRect
     (SDL_Surface * dst, SDL_Rect * dstrect, Uint32 color);
 
+/*
+ * This function blends an RGBA value into the given rectangle.
+ * The given rectangle is clipped to the destination surface clip area
+ * and the final fill rectangle is saved in the passed in pointer.
+ * If 'dstrect' is NULL, the whole surface will be filled with 'color'
+ * This function returns 0 on success, or -1 on error.
+ */
+extern DECLSPEC int SDLCALL SDL_BlendRect
+    (SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r, Uint8 g,
+     Uint8 b, Uint8 a);
+
 /*
  * This performs a fast blit from the source surface to the destination
  * surface.  It assumes that the source and destination rectangles are

src/video/SDL_blendline.c

+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL_video.h"
+#include "SDL_blit.h"
+
+
+int
+SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
+              int blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
+{
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        SDL_SetError("SDL_BlendLine(): Unsupported surface format");
+        return (-1);
+    }
+
+    /* Perform clipping */
+    /* FIXME
+       if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
+       return (0);
+       }
+     */
+
+    SDL_Unsupported();
+    return -1;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */

src/video/SDL_blendrect.c

+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL_video.h"
+#include "SDL_blit.h"
+
+
+int
+SDL_BlendRect(SDL_Surface * dst, SDL_Rect * dstrect, int blendMode, Uint8 r,
+              Uint8 g, Uint8 b, Uint8 a)
+{
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        SDL_SetError("SDL_BlendRect(): Unsupported surface format");
+        return (-1);
+    }
+
+    /* If 'dstrect' == NULL, then fill the whole surface */
+    if (dstrect) {
+        /* Perform clipping */
+        if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
+            return (0);
+        }
+    } else {
+        dstrect = &dst->clip_rect;
+    }
+
+    SDL_Unsupported();
+    return -1;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */

src/video/SDL_drawline.c

+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2009 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL_video.h"
+#include "SDL_blit.h"
+
+
+int
+SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
+{
+    /* This function doesn't work on surfaces < 8 bpp */
+    if (dst->format->BitsPerPixel < 8) {
+        SDL_SetError("SDL_DrawLine(): Unsupported surface format");
+        return (-1);
+    }
+
+    /* Perform clipping */
+    /* FIXME
+       if (!SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect)) {
+       return (0);
+       }
+     */
+
+    SDL_Unsupported();
+    return -1;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */

src/video/SDL_renderer_sw.c

@@ -60,6 +60,9 @@ static int SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                           int *pitch);
 static void SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
 static int SW_SetDrawColor(SDL_Renderer * renderer);
+static int SW_SetDrawBlendMode(SDL_Renderer * renderer);
+static int SW_RenderLine(SDL_Renderer * renderer, int x1, int y1, int x2,
+                         int y2);
 static int SW_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect);
 static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
                          const SDL_Rect * srcrect, const SDL_Rect * dstrect);
@@ -223,11 +226,8 @@ SW_CreateRenderer(SDL_Window * window, Uint32 flags)
     renderer->DisplayModeChanged = SW_DisplayModeChanged;
 
     renderer->SetDrawColor = SW_SetDrawColor;
-    /* FIXME : Implement
-       renderer->SetDrawBlendMode = GL_SetDrawBlendMode;
-       renderer->RenderLine = GL_RenderLine;
-     */
-
+    renderer->SetDrawBlendMode = SW_SetDrawBlendMode;
+    renderer->RenderLine = SW_RenderLine;
     renderer->RenderFill = SW_RenderFill;
     renderer->RenderCopy = SW_RenderCopy;
     renderer->RenderPresent = SW_RenderPresent;
@@ -531,11 +531,66 @@ SW_SetDrawColor(SDL_Renderer * renderer)
     return 0;
 }
 
+static int
+SW_SetDrawBlendMode(SDL_Renderer * renderer)
+{
+    return 0;
+}
+
+static int
+SW_RenderLine(SDL_Renderer * renderer, int x1, int y1, int x2, int y2)
+{
+    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
+    int status;
+
+    if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
+        SDL_Rect rect;
+
+        if (x1 < x2) {
+            rect.x = x1;
+            rect.w = (x2 - x1) + 1;
+        } else {
+            rect.x = x2;
+            rect.w = (x1 - x2) + 1;
+        }
+        if (y1 < y2) {
+            rect.y = y1;
+            rect.h = (y2 - y1) + 1;
+        } else {
+            rect.y = y2;
+            rect.h = (y1 - y2) + 1;
+        }
+        SDL_AddDirtyRect(&data->dirty, &rect);
+    }
+
+    if (data->renderer->LockTexture(data->renderer,
+                                    data->texture[data->current_texture],
+                                    NULL, 1, &data->surface.pixels,
+                                    &data->surface.pitch) < 0) {
+        return -1;
+    }
+
+    if (renderer->blendMode == SDL_BLENDMODE_NONE) {
+        Uint32 color =
+            SDL_MapRGBA(data->surface.format, renderer->r, renderer->g,
+                        renderer->b, renderer->a);
+
+        status = SDL_DrawLine(&data->surface, x1, y1, x2, y2, color);
+    } else {
+        status =
+            SDL_BlendLine(&data->surface, x1, y1, x2, y2, renderer->blendMode,
+                          renderer->r, renderer->g, renderer->b, renderer->a);
+    }
+
+    data->renderer->UnlockTexture(data->renderer,
+                                  data->texture[data->current_texture]);
+    return status;
+}
+
 static int
 SW_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect)
 {
     SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
-    Uint32 color;
     SDL_Rect real_rect;
     int status;
 
@@ -543,22 +598,30 @@ SW_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect)
         SDL_AddDirtyRect(&data->dirty, rect);
     }
 
-    color = SDL_MapRGBA(data->surface.format,
-                        renderer->r, renderer->g, renderer->b, renderer->a);
-
     if (data->renderer->LockTexture(data->renderer,
                                     data->texture[data->current_texture],
                                     rect, 1, &data->surface.pixels,
                                     &data->surface.pitch) < 0) {
         return -1;
     }
+
     data->surface.w = rect->w;
     data->surface.h = rect->h;
     data->surface.clip_rect.w = rect->w;
     data->surface.clip_rect.h = rect->h;
     real_rect = data->surface.clip_rect;
 
-    status = SDL_FillRect(&data->surface, &real_rect, color);
+    if (renderer->blendMode == SDL_BLENDMODE_NONE) {
+        Uint32 color =
+            SDL_MapRGBA(data->surface.format, renderer->r, renderer->g,
+                        renderer->b, renderer->a);
+
+        status = SDL_FillRect(&data->surface, &real_rect, color);
+    } else {
+        status =
+            SDL_BlendRect(&data->surface, &real_rect, renderer->blendMode,
+                          renderer->r, renderer->g, renderer->b, renderer->a);
+    }
 
     data->renderer->UnlockTexture(data->renderer,
                                   data->texture[data->current_texture]);

src/video/dummy/SDL_nullrender.c

@@ -32,6 +32,9 @@
 static SDL_Renderer *SDL_DUMMY_CreateRenderer(SDL_Window * window,
                                               Uint32 flags);
 static int SDL_DUMMY_SetDrawColor(SDL_Renderer * renderer);
+static int SDL_DUMMY_SetDrawBlendMode(SDL_Renderer * renderer);
+static int SDL_DUMMY_RenderLine(SDL_Renderer * renderer, int x1, int y1,
+                                int x2, int y2);
 static int SDL_DUMMY_RenderFill(SDL_Renderer * renderer,
                                 const SDL_Rect * rect);
 static int SDL_DUMMY_RenderCopy(SDL_Renderer * renderer,
@@ -90,6 +93,8 @@ SDL_DUMMY_CreateRenderer(SDL_Window * window, Uint32 flags)
     SDL_zerop(data);
 
     renderer->SetDrawColor = SDL_DUMMY_SetDrawColor;
+    renderer->SetDrawBlendMode = SDL_DUMMY_SetDrawBlendMode;
+    renderer->RenderLine = SDL_DUMMY_RenderLine;
     renderer->RenderFill = SDL_DUMMY_RenderFill;
     renderer->RenderCopy = SDL_DUMMY_RenderCopy;
     renderer->RenderPresent = SDL_DUMMY_RenderPresent;
@@ -131,19 +136,55 @@ SDL_DUMMY_SetDrawColor(SDL_Renderer * renderer)
     return 0;
 }
 
+static int
+SDL_DUMMY_SetDrawBlendMode(SDL_Renderer * renderer)
+{
+    return 0;
+}
+
+static int
+SDL_DUMMY_RenderLine(SDL_Renderer * renderer, int x1, int y1, int x2, int y2)
+{
+    SDL_DUMMY_RenderData *data =
+        (SDL_DUMMY_RenderData *) renderer->driverdata;
+    SDL_Surface *target = data->screens[data->current_screen];
+    int status;
+
+    if (renderer->blendMode == SDL_BLENDMODE_NONE) {
+        Uint32 color =
+            SDL_MapRGBA(target->format, renderer->r, renderer->g, renderer->b,
+                        renderer->a);
+
+        status = SDL_DrawLine(target, x1, y1, x2, y2, color);
+    } else {
+        status =
+            SDL_BlendLine(target, x1, y1, x2, y2, renderer->blendMode,
+                          renderer->r, renderer->g, renderer->b, renderer->a);
+    }
+    return status;
+}
+
 static int
 SDL_DUMMY_RenderFill(SDL_Renderer * renderer, const SDL_Rect * rect)
 {
     SDL_DUMMY_RenderData *data =
         (SDL_DUMMY_RenderData *) renderer->driverdata;
     SDL_Surface *target = data->screens[data->current_screen];
-    Uint32 color;
     SDL_Rect real_rect = *rect;
+    int status;
 
-    color = SDL_MapRGBA(target->format,
-                        renderer->r, renderer->g, renderer->b, renderer->a);
+    if (renderer->blendMode == SDL_BLENDMODE_NONE) {
+        Uint32 color =
+            SDL_MapRGBA(target->format, renderer->r, renderer->g, renderer->b,
+                        renderer->a);
 
-    return SDL_FillRect(target, &real_rect, color);
+        status = SDL_FillRect(target, &real_rect, color);
+    } else {
+        status =
+            SDL_BlendRect(target, &real_rect, renderer->blendMode,
+                          renderer->r, renderer->g, renderer->b, renderer->a);
+    }
+    return status;
 }
 
 static int

src/video/x11/SDL_x11render.c

@@ -597,6 +597,7 @@ X11_RenderLine(SDL_Renderer * renderer, int x1, int y1, int x2, int y2)
 {
     X11_RenderData *data = (X11_RenderData *) renderer->driverdata;
     unsigned long foreground;
+
     if (data->makedirty) {
         SDL_Rect rect;