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Fixed bug #859 CREATE_SUBDIRS helps a lot if browsing HTML documentation in a file browser. ALWAYS_DETAILED_SEC makes sure everything has at least the automatic documentation like function prototype and source references. STRIP_FROM_PATH allows you to include only the relevant portions of the files' paths, cleaning up both the file list and directory tree, though you need to change the path listed here to match wherever you put SDL. ALIASES avoids some warnings generated by C:\source\svn.libsdl.org\trunk\SDL\src\joystick\darwin\10.3.9-FIX\IOHIDLib.h. It seems Apple uses a few commands which are not normally supported by Doxygen. BUILTIN_STL_SUPPORT adds support for parsing code which makes use of the standard template library. There isn't a lot of C++ in SDL (some in bwindow at least), but this still seems like a good idea. TYPEDEF_HIDES_STRUCT means that for code like this: typedef struct A {int B;} C; C is documented as a structure containing B instead of a typedef mapped to A. EXTRACT_ALL, EXTRACT_PRIVATE, EXTRACT_STATIC, EXTRACT_LOCAL_METHODS, EXTRACT_ANON_NSPACES and INTERNAL_DOCS make sure that _everything_ is documented. CASE_SENSE_NAMES = NO avoids potential conflicts when building documentation on case insensitive file systems like NTFS and FAT32. WARN_NO_PARAMDOC lets you know when you have documented some, but not all, of the parameters of a function. This is useful when you're working on adding such documentation since it makes partially documented functions easier to spot. WARN_LOGFILE writes warnings to a seperate file instead of mixing them in with stdout. When not running in quiet mode, these warnings can be hard to spot without this flag. I added *.h.in and *.h.default to FILE_PATTERNS to generate documentation for config.h.in and config.h.default. RECURSIVE tells doxygen to look not only in the input directory, but also in subfolders. EXCLUDE avoids documenting things like test programs, examples and templates which need to be documented separately. I've used EXCLUDE_PATTERNS to exclude non-source subdirectories that often find their way into source folders (such as obj or .svn). EXAMPLE_PATH lists directories doxygen will search to find included example code. So far, SDL doesn't really use this feature, but I've listed some likely locations. SOURCE_BROWSER adds syntax highlighted source code to the HTML output. USE_HTAGS is nice, but not available on Windows. INLINE_SOURCES adds the body of a function to it's documentation so you can quickly see exactly what it does. ALPHABETICAL_INDEX generates an alphabetical list of all structures, functions, etc., which makes it much easier to find what you're looking for. IGNORE_PREFIX skips the SDL_ prefix when deciding which index page to place an item on so you don't have everything show up under "S". HTML_DYNAMIC_SECTIONS hides the includes/included by diagrams by default and adds JavaScript to allow the user to show and hide them by clicking a link. ENUM_VALUES_PER_LINE = 1 makes enums easier to read by placing each value on it's own line. GENERATE_TREEVIEW produces a two frame index page with a navigation tree on the left. I have LaTeX and man pages turned off to speed up doxygen, you may want to turn them back on yourself. I added _WIN32=1 to PREDEFINED to cause SDL to output documentation related to Win32 builds of SDL. Normally, doxygen gets confused since there are multiple definitions for various structures and formats that vary by platform. Without this doxygen can produce broken documentation or, if you're lucky, output documentation only for the dummy drivers, which isn't very useful. You need to pick a platform. GENERATE_TAGFILE produces a file which can be used to link other doxygen documentation to the SDL documentation. CLASS_DIAGRAMS turns on class diagrams even when dot is not available. HAVE_DOT tells doxygen to try to use dot to generate diagrams. TEMPLATE_RELATIONS and INCLUDE_GRAPH add additional diagrams to the documentation. DOT_MULTI_TARGETS speeds up dot. OUTPUT_DIRECTORY, INPUT and other paths reflect the fact that this Doxyfile is intended to process src as well as include and is being run from a separate subdirectory. Doxygen produces several temporary files while it's running and if interrupted, can leave those files behind. It's easier to clean up if there aren't a hundred or so files in the same folder. I typically run doxygen in SDL/doxy and set the output directory to '.'. Since doxygen puts it's output in subfolders by type, this keeps things pretty well organised. You could use '../doc' instead and get the same results.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 21 Jan 2011 12:57:01 -0800
parents aa8888658021
children da10636e5eca
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2010 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_sysvideo.h"
#include "SDL_pixels_c.h"
#include "SDL_rect_c.h"
#include "SDL_yuv_sw_c.h"
#include "SDL_renderer_sw.h"


/* SDL surface based renderer implementation */

static SDL_Renderer *SW_CreateRenderer(SDL_Window * window, Uint32 flags);
static int SW_ActivateRenderer(SDL_Renderer * renderer);
static int SW_DisplayModeChanged(SDL_Renderer * renderer);
static int SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int SW_QueryTexturePixels(SDL_Renderer * renderer,
                                 SDL_Texture * texture, void **pixels,
                                 int *pitch);
static int SW_SetTexturePalette(SDL_Renderer * renderer,
                                SDL_Texture * texture,
                                const SDL_Color * colors, int firstcolor,
                                int ncolors);
static int SW_GetTexturePalette(SDL_Renderer * renderer,
                                SDL_Texture * texture, SDL_Color * colors,
                                int firstcolor, int ncolors);
static int SW_SetTextureColorMod(SDL_Renderer * renderer,
                                 SDL_Texture * texture);
static int SW_SetTextureAlphaMod(SDL_Renderer * renderer,
                                 SDL_Texture * texture);
static int SW_SetTextureBlendMode(SDL_Renderer * renderer,
                                  SDL_Texture * texture);
static int SW_SetTextureScaleMode(SDL_Renderer * renderer,
                                  SDL_Texture * texture);
static int SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                            const SDL_Rect * rect, const void *pixels,
                            int pitch);
static int SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                          const SDL_Rect * rect, int markDirty, void **pixels,
                          int *pitch);
static void SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int SW_RenderDrawPoints(SDL_Renderer * renderer,
                               const SDL_Point * points, int count);
static int SW_RenderDrawLines(SDL_Renderer * renderer,
                              const SDL_Point * points, int count);
static int SW_RenderDrawRects(SDL_Renderer * renderer,
                              const SDL_Rect ** rects, int count);
static int SW_RenderFillRects(SDL_Renderer * renderer,
                              const SDL_Rect ** rects, int count);
static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
                         const SDL_Rect * srcrect, const SDL_Rect * dstrect);
static int SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                               Uint32 format, void * pixels, int pitch);
static int SW_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                                Uint32 format, const void * pixels, int pitch);
static void SW_RenderPresent(SDL_Renderer * renderer);
static void SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void SW_DestroyRenderer(SDL_Renderer * renderer);


SDL_RenderDriver SW_RenderDriver = {
    SW_CreateRenderer,
    {
     "software",
     (SDL_RENDERER_SINGLEBUFFER | SDL_RENDERER_PRESENTCOPY |
      SDL_RENDERER_PRESENTFLIP2 | SDL_RENDERER_PRESENTFLIP3 |
      SDL_RENDERER_PRESENTDISCARD | SDL_RENDERER_PRESENTVSYNC),
     (SDL_TEXTUREMODULATE_NONE | SDL_TEXTUREMODULATE_COLOR |
      SDL_TEXTUREMODULATE_ALPHA),
     (SDL_BLENDMODE_NONE | SDL_BLENDMODE_MASK |
      SDL_BLENDMODE_BLEND | SDL_BLENDMODE_ADD | SDL_BLENDMODE_MOD),
     (SDL_SCALEMODE_NONE | SDL_SCALEMODE_FAST),
     14,
     {
      SDL_PIXELFORMAT_INDEX8,
      SDL_PIXELFORMAT_RGB555,
      SDL_PIXELFORMAT_RGB565,
      SDL_PIXELFORMAT_RGB888,
      SDL_PIXELFORMAT_BGR888,
      SDL_PIXELFORMAT_ARGB8888,
      SDL_PIXELFORMAT_RGBA8888,
      SDL_PIXELFORMAT_ABGR8888,
      SDL_PIXELFORMAT_BGRA8888,
      SDL_PIXELFORMAT_YV12,
      SDL_PIXELFORMAT_IYUV,
      SDL_PIXELFORMAT_YUY2,
      SDL_PIXELFORMAT_UYVY,
      SDL_PIXELFORMAT_YVYU},
     0,
     0}
};

typedef struct
{
    Uint32 format;
    SDL_bool updateSize;
    int current_texture;
    SDL_Texture *texture[3];
    SDL_Surface surface;
    SDL_Renderer *renderer;
    SDL_DirtyRectList dirty;
} SW_RenderData;

static SDL_Texture *
CreateTexture(SDL_Renderer * renderer, Uint32 format, int w, int h)
{
    SDL_Texture *texture;

    texture = (SDL_Texture *) SDL_calloc(1, sizeof(*texture));
    if (!texture) {
        SDL_OutOfMemory();
        return NULL;
    }

    texture->format = format;
    texture->access = SDL_TEXTUREACCESS_STREAMING;
    texture->w = w;
    texture->h = h;
    texture->renderer = renderer;

    if (renderer->CreateTexture(renderer, texture) < 0) {
        SDL_free(texture);
        return NULL;
    }
    return texture;
}

static void
DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    renderer->DestroyTexture(renderer, texture);
    SDL_free(texture);
}

static int
DisplayPaletteChanged(void *userdata, SDL_Palette * palette)
{
    SW_RenderData *data = (SW_RenderData *) userdata;
    int i;

    for (i = 0; i < SDL_arraysize(data->texture); ++i) {
        if (data->texture[i] && data->renderer->SetTexturePalette) {
            data->renderer->SetTexturePalette(data->renderer,
                                              data->texture[i],
                                              palette->colors, 0,
                                              palette->ncolors);
        }
    }
    return 0;
}

void
Setup_SoftwareRenderer(SDL_Renderer * renderer)
{
    renderer->CreateTexture = SW_CreateTexture;
    renderer->QueryTexturePixels = SW_QueryTexturePixels;
    renderer->SetTexturePalette = SW_SetTexturePalette;
    renderer->GetTexturePalette = SW_GetTexturePalette;
    renderer->SetTextureColorMod = SW_SetTextureColorMod;
    renderer->SetTextureAlphaMod = SW_SetTextureAlphaMod;
    renderer->SetTextureBlendMode = SW_SetTextureBlendMode;
    renderer->SetTextureScaleMode = SW_SetTextureScaleMode;
    renderer->UpdateTexture = SW_UpdateTexture;
    renderer->LockTexture = SW_LockTexture;
    renderer->UnlockTexture = SW_UnlockTexture;
    renderer->DestroyTexture = SW_DestroyTexture;

    renderer->info.mod_modes = SW_RenderDriver.info.mod_modes;
    renderer->info.blend_modes = SW_RenderDriver.info.blend_modes;
    renderer->info.scale_modes = SW_RenderDriver.info.scale_modes;
    renderer->info.num_texture_formats =
        SW_RenderDriver.info.num_texture_formats;
    SDL_memcpy(renderer->info.texture_formats,
               SW_RenderDriver.info.texture_formats,
               sizeof(renderer->info.texture_formats));;
    renderer->info.max_texture_width = SW_RenderDriver.info.max_texture_width;
    renderer->info.max_texture_height =
        SW_RenderDriver.info.max_texture_height;
}

SDL_Renderer *
SW_CreateRenderer(SDL_Window * window, Uint32 flags)
{
    SDL_VideoDisplay *display = window->display;
    SDL_DisplayMode *displayMode = &display->current_mode;
    SDL_Renderer *renderer;
    SW_RenderData *data;
    int i, n;
    int bpp;
    Uint32 Rmask, Gmask, Bmask, Amask;
    Uint32 renderer_flags;
    const char *desired_driver;

    if (!SDL_PixelFormatEnumToMasks
        (displayMode->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
        SDL_SetError("Unknown display format");
        return NULL;
    }

    renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
    if (!renderer) {
        SDL_OutOfMemory();
        return NULL;
    }

    data = (SW_RenderData *) SDL_calloc(1, sizeof(*data));
    if (!data) {
        SW_DestroyRenderer(renderer);
        SDL_OutOfMemory();
        return NULL;
    }
    renderer->ActivateRenderer = SW_ActivateRenderer;
    renderer->DisplayModeChanged = SW_DisplayModeChanged;

    renderer->RenderDrawPoints = SW_RenderDrawPoints;
    renderer->RenderDrawLines = SW_RenderDrawLines;
    renderer->RenderDrawRects = SW_RenderDrawRects;
    renderer->RenderFillRects = SW_RenderFillRects;
    renderer->RenderCopy = SW_RenderCopy;
    renderer->RenderReadPixels = SW_RenderReadPixels;
    renderer->RenderWritePixels = SW_RenderWritePixels;
    renderer->RenderPresent = SW_RenderPresent;
    renderer->DestroyRenderer = SW_DestroyRenderer;
    renderer->info.name = SW_RenderDriver.info.name;
    renderer->info.flags = 0;
    renderer->window = window;
    renderer->driverdata = data;
    Setup_SoftwareRenderer(renderer);

    if (flags & SDL_RENDERER_PRESENTFLIP2) {
        renderer->info.flags |= SDL_RENDERER_PRESENTFLIP2;
        n = 2;
    } else if (flags & SDL_RENDERER_PRESENTFLIP3) {
        renderer->info.flags |= SDL_RENDERER_PRESENTFLIP3;
        n = 3;
    } else {
        renderer->info.flags |= SDL_RENDERER_PRESENTCOPY;
        n = 1;
    }
    data->format = displayMode->format;

    /* Find a render driver that we can use to display data */
    renderer_flags = (SDL_RENDERER_SINGLEBUFFER |
                      SDL_RENDERER_PRESENTDISCARD);
    if (flags & SDL_RENDERER_PRESENTVSYNC) {
        renderer_flags |= SDL_RENDERER_PRESENTVSYNC;
    }
    desired_driver = SDL_getenv("SDL_VIDEO_RENDERER_SWDRIVER");
    for (i = 0; i < display->num_render_drivers; ++i) {
        SDL_RenderDriver *driver = &display->render_drivers[i];
        if (driver->info.name == SW_RenderDriver.info.name) {
            continue;
        }
        if (desired_driver
            && SDL_strcasecmp(desired_driver, driver->info.name) != 0) {
            continue;
        }
        data->renderer = driver->CreateRenderer(window, renderer_flags);
        if (data->renderer) {
            break;
        }
    }
    if (i == display->num_render_drivers) {
        SW_DestroyRenderer(renderer);
        SDL_SetError("Couldn't find display render driver");
        return NULL;
    }
    if (data->renderer->info.flags & SDL_RENDERER_PRESENTVSYNC) {
        renderer->info.flags |= SDL_RENDERER_PRESENTVSYNC;
    }

    /* Create the textures we'll use for display */
    for (i = 0; i < n; ++i) {
        data->texture[i] =
            CreateTexture(data->renderer, data->format, window->w, window->h);
        if (!data->texture[i]) {
            SW_DestroyRenderer(renderer);
            return NULL;
        }
    }
    data->current_texture = 0;

    /* Create a surface we'll use for rendering */
    data->surface.flags = SDL_PREALLOC;
    data->surface.format = SDL_AllocFormat(bpp, Rmask, Gmask, Bmask, Amask);
    if (!data->surface.format) {
        SW_DestroyRenderer(renderer);
        return NULL;
    }
    SDL_SetSurfacePalette(&data->surface, display->palette);

    /* Set up a palette watch on the display palette */
    if (display->palette) {
        SDL_AddPaletteWatch(display->palette, DisplayPaletteChanged, data);
    }

    return renderer;
}

static int
SW_ActivateRenderer(SDL_Renderer * renderer)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Window *window = renderer->window;
    int i, n;

    if (data->renderer && data->renderer->ActivateRenderer) {
        if (data->renderer->ActivateRenderer(data->renderer) < 0) {
            return -1;
        }
    }
    if (data->updateSize) {
        /* Recreate the textures for the new window size */
        if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP2) {
            n = 2;
        } else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {
            n = 3;
        } else {
            n = 1;
        }
        for (i = 0; i < n; ++i) {
            if (data->texture[i]) {
                DestroyTexture(data->renderer, data->texture[i]);
                data->texture[i] = 0;
            }
        }
        for (i = 0; i < n; ++i) {
            data->texture[i] =
                CreateTexture(data->renderer, data->format, window->w,
                              window->h);
            if (!data->texture[i]) {
                return -1;
            }
        }
        data->updateSize = SDL_FALSE;
    }
    return 0;
}

static int
SW_DisplayModeChanged(SDL_Renderer * renderer)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;

    if (data->renderer && data->renderer->DisplayModeChanged) {
        if (data->renderer->DisplayModeChanged(data->renderer) < 0) {
            return -1;
        }
    }
    /* Rebind the context to the window area */
    data->updateSize = SDL_TRUE;
    return SW_ActivateRenderer(renderer);
}

static int
SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        texture->driverdata =
            SDL_SW_CreateYUVTexture(texture->format, texture->w, texture->h);
    } else {
        int bpp;
        Uint32 Rmask, Gmask, Bmask, Amask;

        if (!SDL_PixelFormatEnumToMasks
            (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
            SDL_SetError("Unknown texture format");
            return -1;
        }

        texture->driverdata =
            SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
                                 Bmask, Amask);
        SDL_SetSurfaceColorMod(texture->driverdata, texture->r, texture->g,
                               texture->b);
        SDL_SetSurfaceAlphaMod(texture->driverdata, texture->a);
        SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode);
        SDL_SetSurfaceScaleMode(texture->driverdata, texture->scaleMode);

        if (texture->access == SDL_TEXTUREACCESS_STATIC) {
            SDL_SetSurfaceRLE(texture->driverdata, 1);
        }
    }

    if (!texture->driverdata) {
        return -1;
    }
    return 0;
}

static int
SW_QueryTexturePixels(SDL_Renderer * renderer, SDL_Texture * texture,
                      void **pixels, int *pitch)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        return SDL_SW_QueryYUVTexturePixels((SDL_SW_YUVTexture *)
                                            texture->driverdata, pixels,
                                            pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        *pixels = surface->pixels;
        *pitch = surface->pitch;
        return 0;
    }
}

static int
SW_SetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
                     const SDL_Color * colors, int firstcolor, int ncolors)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SetError("YUV textures don't have a palette");
        return -1;
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        return SDL_SetPaletteColors(surface->format->palette, colors,
                                    firstcolor, ncolors);
    }
}

static int
SW_GetTexturePalette(SDL_Renderer * renderer, SDL_Texture * texture,
                     SDL_Color * colors, int firstcolor, int ncolors)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SetError("YUV textures don't have a palette");
        return -1;
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        SDL_memcpy(colors, &surface->format->palette->colors[firstcolor],
                   ncolors * sizeof(*colors));
        return 0;
    }
}

static int
SW_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    return SDL_SetSurfaceColorMod(surface, texture->r, texture->g,
                                  texture->b);
}

static int
SW_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    return SDL_SetSurfaceAlphaMod(surface, texture->a);
}

static int
SW_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    return SDL_SetSurfaceBlendMode(surface, texture->blendMode);
}

static int
SW_SetTextureScaleMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    return SDL_SetSurfaceScaleMode(surface, texture->scaleMode);
}

static int
SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
                 const SDL_Rect * rect, const void *pixels, int pitch)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        return SDL_SW_UpdateYUVTexture((SDL_SW_YUVTexture *)
                                       texture->driverdata, rect, pixels,
                                       pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
        Uint8 *src, *dst;
        int row;
        size_t length;

        src = (Uint8 *) pixels;
        dst =
            (Uint8 *) surface->pixels + rect->y * surface->pitch +
            rect->x * surface->format->BytesPerPixel;
        length = rect->w * surface->format->BytesPerPixel;
        for (row = 0; row < rect->h; ++row) {
            SDL_memcpy(dst, src, length);
            src += pitch;
            dst += surface->pitch;
        }
        return 0;
    }
}

static int
SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
               const SDL_Rect * rect, int markDirty, void **pixels,
               int *pitch)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        return SDL_SW_LockYUVTexture((SDL_SW_YUVTexture *)
                                     texture->driverdata, rect, markDirty,
                                     pixels, pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        *pixels =
            (void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
                      rect->x * surface->format->BytesPerPixel);
        *pitch = surface->pitch;
        return 0;
    }
}

static void
SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SW_UnlockYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
    }
}

static int
SW_RenderDrawPoints(SDL_Renderer * renderer, const SDL_Point * points,
                    int count)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Texture *texture = data->texture[data->current_texture];
    SDL_Rect rect;
    int i;
    int x, y;
    int status = 0;

    /* Get the smallest rectangle that contains everything */
    rect.x = 0;
    rect.y = 0;
    rect.w = texture->w;
    rect.h = texture->h;
    if (!SDL_EnclosePoints(points, count, &rect, &rect)) {
        /* Nothing to draw */
        return 0;
    }

    if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
        SDL_AddDirtyRect(&data->dirty, &rect);
    }

    if (data->renderer->LockTexture(data->renderer, texture, &rect, 1,
                                    &data->surface.pixels,
                                    &data->surface.pitch) < 0) {
        return -1;
    }

    data->surface.clip_rect.w = data->surface.w = rect.w;
    data->surface.clip_rect.h = data->surface.h = rect.h;

    /* Draw the points! */
    if (renderer->blendMode == SDL_BLENDMODE_NONE ||
        renderer->blendMode == SDL_BLENDMODE_MASK) {
        Uint32 color = SDL_MapRGBA(data->surface.format,
                                   renderer->r, renderer->g, renderer->b,
                                   renderer->a);

        for (i = 0; i < count; ++i) {
            x = points[i].x - rect.x;
            y = points[i].y - rect.y;

            status = SDL_DrawPoint(&data->surface, x, y, color);
        }
    } else {
        for (i = 0; i < count; ++i) {
            x = points[i].x - rect.x;
            y = points[i].y - rect.y;

            status = SDL_BlendPoint(&data->surface, x, y,
                                    renderer->blendMode,
                                    renderer->r, renderer->g, renderer->b,
                                    renderer->a);
        }
    }

    data->renderer->UnlockTexture(data->renderer, texture);

    return status;
}

static int
SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
                   int count)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Texture *texture = data->texture[data->current_texture];
    SDL_Rect clip, rect;
    int i;
    int x1, y1, x2, y2;
    int status = 0;

    /* Get the smallest rectangle that contains everything */
    clip.x = 0;
    clip.y = 0;
    clip.w = texture->w;
    clip.h = texture->h;
    SDL_EnclosePoints(points, count, NULL, &rect);
    if (!SDL_IntersectRect(&rect, &clip, &rect)) {
        /* Nothing to draw */
        return 0;
    }

    if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
        SDL_AddDirtyRect(&data->dirty, &rect);
    }

    if (data->renderer->LockTexture(data->renderer, texture, &rect, 1,
                                    &data->surface.pixels,
                                    &data->surface.pitch) < 0) {
        return -1;
    }

    data->surface.clip_rect.w = data->surface.w = rect.w;
    data->surface.clip_rect.h = data->surface.h = rect.h;

    /* Draw the points! */
    if (renderer->blendMode == SDL_BLENDMODE_NONE ||
        renderer->blendMode == SDL_BLENDMODE_MASK) {
        Uint32 color = SDL_MapRGBA(data->surface.format,
                                   renderer->r, renderer->g, renderer->b,
                                   renderer->a);

        for (i = 1; i < count; ++i) {
            x1 = points[i-1].x - rect.x;
            y1 = points[i-1].y - rect.y;
            x2 = points[i].x - rect.x;
            y2 = points[i].y - rect.y;

            status = SDL_DrawLine(&data->surface, x1, y1, x2, y2, color);
        }
    } else {
        for (i = 1; i < count; ++i) {
            x1 = points[i-1].x - rect.x;
            y1 = points[i-1].y - rect.y;
            x2 = points[i].x - rect.x;
            y2 = points[i].y - rect.y;

            status = SDL_BlendLine(&data->surface, x1, y1, x2, y2,
                                   renderer->blendMode,
                                   renderer->r, renderer->g, renderer->b,
                                   renderer->a);
        }
    }

    data->renderer->UnlockTexture(data->renderer, texture);

    return status;
}

static int
SW_RenderDrawRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
                   int count)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Texture *texture = data->texture[data->current_texture];
    SDL_Rect clip, rect;
    Uint32 color = 0;
    int i;
    int status = 0;

    clip.x = 0;
    clip.y = 0;
    clip.w = texture->w;
    clip.h = texture->h;

    if (renderer->blendMode == SDL_BLENDMODE_NONE ||
        renderer->blendMode == SDL_BLENDMODE_MASK) {
        color = SDL_MapRGBA(data->surface.format,
                            renderer->r, renderer->g, renderer->b,
                            renderer->a);
    }

    for (i = 0; i < count; ++i) {
        /* FIXME: We don't want to draw clipped edges */
        if (!SDL_IntersectRect(rects[i], &clip, &rect)) {
            /* Nothing to draw */
            continue;
        }

        if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
            SDL_AddDirtyRect(&data->dirty, &rect);
        }

        if (data->renderer->LockTexture(data->renderer, texture, &rect, 1,
                                        &data->surface.pixels,
                                        &data->surface.pitch) < 0) {
            return -1;
        }

        data->surface.clip_rect.w = data->surface.w = rect.w;
        data->surface.clip_rect.h = data->surface.h = rect.h;

        if (renderer->blendMode == SDL_BLENDMODE_NONE ||
            renderer->blendMode == SDL_BLENDMODE_MASK) {
            status = SDL_DrawRect(&data->surface, NULL, color);
        } else {
            status = SDL_BlendRect(&data->surface, NULL,
                                   renderer->blendMode,
                                   renderer->r, renderer->g, renderer->b,
                                   renderer->a);
        }

        data->renderer->UnlockTexture(data->renderer, texture);
    }
    return status;
}

static int
SW_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
                   int count)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Texture *texture = data->texture[data->current_texture];
    SDL_Rect clip, rect;
    Uint32 color = 0;
    int i;
    int status = 0;

    clip.x = 0;
    clip.y = 0;
    clip.w = texture->w;
    clip.h = texture->h;

    if (renderer->blendMode == SDL_BLENDMODE_NONE ||
        renderer->blendMode == SDL_BLENDMODE_MASK) {
        color = SDL_MapRGBA(data->surface.format,
                            renderer->r, renderer->g, renderer->b,
                            renderer->a);
    }

    for (i = 0; i < count; ++i) {
        if (!SDL_IntersectRect(rects[i], &clip, &rect)) {
            /* Nothing to draw */
            continue;
        }

        if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
            SDL_AddDirtyRect(&data->dirty, &rect);
        }

        if (data->renderer->LockTexture(data->renderer, texture, &rect, 1,
                                        &data->surface.pixels,
                                        &data->surface.pitch) < 0) {
            return -1;
        }

        data->surface.clip_rect.w = data->surface.w = rect.w;
        data->surface.clip_rect.h = data->surface.h = rect.h;

        if (renderer->blendMode == SDL_BLENDMODE_NONE ||
            renderer->blendMode == SDL_BLENDMODE_MASK) {
            status = SDL_FillRect(&data->surface, NULL, color);
        } else {
            status = SDL_BlendFillRect(&data->surface, NULL,
                                       renderer->blendMode,
                                       renderer->r, renderer->g, renderer->b,
                                       renderer->a);
        }

        data->renderer->UnlockTexture(data->renderer, texture);
    }
    return status;
}

static int
SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
              const SDL_Rect * srcrect, const SDL_Rect * dstrect)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    int status;

    if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
        SDL_AddDirtyRect(&data->dirty, dstrect);
    }

    if (data->renderer->LockTexture(data->renderer,
                                    data->texture[data->current_texture],
                                    dstrect, 1, &data->surface.pixels,
                                    &data->surface.pitch) < 0) {
        return -1;
    }

    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        status =
            SDL_SW_CopyYUVToRGB((SDL_SW_YUVTexture *) texture->driverdata,
                                srcrect, data->format, dstrect->w, dstrect->h,
                                data->surface.pixels, data->surface.pitch);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
        SDL_Rect real_srcrect = *srcrect;
        SDL_Rect real_dstrect;

        data->surface.w = dstrect->w;
        data->surface.h = dstrect->h;
        data->surface.clip_rect.w = dstrect->w;
        data->surface.clip_rect.h = dstrect->h;
        real_dstrect = data->surface.clip_rect;

        status =
            SDL_LowerBlit(surface, &real_srcrect, &data->surface,
                          &real_dstrect);
    }
    data->renderer->UnlockTexture(data->renderer,
                                  data->texture[data->current_texture]);
    return status;
}

static int
SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                    Uint32 format, void * pixels, int pitch)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;

    if (data->renderer->LockTexture(data->renderer,
                                    data->texture[data->current_texture],
                                    rect, 0, &data->surface.pixels,
                                    &data->surface.pitch) < 0) {
        return -1;
    }

    SDL_ConvertPixels(rect->w, rect->h,
                      data->format, data->surface.pixels, data->surface.pitch,
                      format, pixels, pitch);

    data->renderer->UnlockTexture(data->renderer,
                                  data->texture[data->current_texture]);
    return 0;
}

static int
SW_RenderWritePixels(SDL_Renderer * renderer, const SDL_Rect * rect,
                     Uint32 format, const void * pixels, int pitch)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;

    if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
        SDL_AddDirtyRect(&data->dirty, rect);
    }

    if (data->renderer->LockTexture(data->renderer,
                                    data->texture[data->current_texture],
                                    rect, 1, &data->surface.pixels,
                                    &data->surface.pitch) < 0) {
        return -1;
    }

    SDL_ConvertPixels(rect->w, rect->h, format, pixels, pitch,
                      data->format, data->surface.pixels, data->surface.pitch);

    data->renderer->UnlockTexture(data->renderer,
                                  data->texture[data->current_texture]);
    return 0;
}

static void
SW_RenderPresent(SDL_Renderer * renderer)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Texture *texture = data->texture[data->current_texture];

    /* Send the data to the display */
    if (data->renderer->info.flags & SDL_RENDERER_PRESENTCOPY) {
        SDL_DirtyRect *dirty;
        for (dirty = data->dirty.list; dirty; dirty = dirty->next) {
            data->renderer->RenderCopy(data->renderer, texture, &dirty->rect,
                                       &dirty->rect);
        }
        SDL_ClearDirtyRects(&data->dirty);
    } else {
        SDL_Rect rect;
        rect.x = 0;
        rect.y = 0;
        rect.w = texture->w;
        rect.h = texture->h;
        data->renderer->RenderCopy(data->renderer, texture, &rect, &rect);
    }
    data->renderer->RenderPresent(data->renderer);

    /* Update the flipping chain, if any */
    if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP2) {
        data->current_texture = (data->current_texture + 1) % 2;
    } else if (renderer->info.flags & SDL_RENDERER_PRESENTFLIP3) {
        data->current_texture = (data->current_texture + 1) % 3;
    }
}

static void
SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
    if (SDL_ISPIXELFORMAT_FOURCC(texture->format)) {
        SDL_SW_DestroyYUVTexture((SDL_SW_YUVTexture *) texture->driverdata);
    } else {
        SDL_Surface *surface = (SDL_Surface *) texture->driverdata;

        SDL_FreeSurface(surface);
    }
}

static void
SW_DestroyRenderer(SDL_Renderer * renderer)
{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
    SDL_Window *window = renderer->window;
    SDL_VideoDisplay *display = window->display;
    int i;

    if (data) {
        for (i = 0; i < SDL_arraysize(data->texture); ++i) {
            if (data->texture[i]) {
                DestroyTexture(data->renderer, data->texture[i]);
            }
        }
        if (data->surface.format) {
            SDL_SetSurfacePalette(&data->surface, NULL);
            SDL_FreeFormat(data->surface.format);
        }
        if (display->palette) {
            SDL_DelPaletteWatch(display->palette, DisplayPaletteChanged,
                                data);
        }
        if (data->renderer) {
            data->renderer->DestroyRenderer(data->renderer);
        }
        SDL_FreeDirtyRects(&data->dirty);
        SDL_free(data);
    }
    SDL_free(renderer);
}

/* vi: set ts=4 sw=4 expandtab: */