SDL_render_sw.c File Reference

#include "../../SDL_internal.h"
#include "../SDL_sysrender.h"
#include "SDL_render_sw_c.h"
#include "SDL_hints.h"
#include "SDL_draw.h"
#include "SDL_blendfillrect.h"
#include "SDL_blendline.h"
#include "SDL_blendpoint.h"
#include "SDL_drawline.h"
#include "SDL_drawpoint.h"
#include "SDL_rotate.h"

Include dependency graph for SDL_render_sw.c:

Go to the source code of this file.

Data Structures
struct	SW_DrawStateCache
struct	SW_RenderData
struct	CopyExData

Functions
static SDL_Surface *	SW_ActivateRenderer (SDL_Renderer *renderer)
static void	SW_WindowEvent (SDL_Renderer *renderer, const SDL_WindowEvent *event)
static int	SW_GetOutputSize (SDL_Renderer *renderer, int *w, int *h)
static int	SW_CreateTexture (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, void **pixels, int *pitch)
static void	SW_UnlockTexture (SDL_Renderer *renderer, SDL_Texture *texture)
static void	SW_SetTextureScaleMode (SDL_Renderer *renderer, SDL_Texture *texture, SDL_ScaleMode scaleMode)
static int	SW_SetRenderTarget (SDL_Renderer *renderer, SDL_Texture *texture)
static int	SW_QueueSetViewport (SDL_Renderer *renderer, SDL_RenderCommand *cmd)
static int	SW_QueueDrawPoints (SDL_Renderer *renderer, SDL_RenderCommand *cmd, const SDL_FPoint *points, int count)
static int	SW_QueueFillRects (SDL_Renderer *renderer, SDL_RenderCommand *cmd, const SDL_FRect *rects, int count)
static int	SW_QueueCopy (SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture, const SDL_Rect *srcrect, const SDL_FRect *dstrect)
static int	SW_QueueCopyEx (SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture, const SDL_Rect *srcrect, const SDL_FRect *dstrect, const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
static int	SW_RenderCopyEx (SDL_Renderer *renderer, SDL_Surface *surface, SDL_Texture *texture, const SDL_Rect *srcrect, const SDL_Rect *final_rect, const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip)
static void	PrepTextureForCopy (const SDL_RenderCommand *cmd)
static void	SetDrawState (SDL_Surface *surface, SW_DrawStateCache *drawstate)
static int	SW_RunCommandQueue (SDL_Renderer *renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize)
static int	SW_RenderReadPixels (SDL_Renderer *renderer, const SDL_Rect *rect, Uint32 format, 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_Renderer *	SW_CreateRendererForSurface (SDL_Surface *surface)
static SDL_Renderer *	SW_CreateRenderer (SDL_Window *window, Uint32 flags)

Variables
SDL_RenderDriver	SW_RenderDriver

Function Documentation

PrepTextureForCopy()

static void PrepTextureForCopy ( const SDL_RenderCommand *  cmd )

static

Definition at line 564 of file SDL_render_sw.c.

{
    const Uint8 r = cmd->data.draw.r;
    const Uint8 g = cmd->data.draw.g;
    const Uint8 b = cmd->data.draw.b;
    const Uint8 a = cmd->data.draw.a;
    const SDL_BlendMode blend = cmd->data.draw.blend;
    SDL_Texture *texture = cmd->data.draw.texture;
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    const SDL_bool colormod = ((r & g & b) != 0xFF);
    const SDL_bool alphamod = (a != 0xFF);
    const SDL_bool blending = ((blend == SDL_BLENDMODE_ADD) || (blend == SDL_BLENDMODE_MOD) || (blend == SDL_BLENDMODE_MUL));
 
    if (colormod || alphamod || blending) {
        SDL_SetSurfaceRLE(surface, 0);
    }
 
    /* !!! FIXME: we can probably avoid some of these calls. */
    SDL_SetSurfaceColorMod(surface, r, g, b);
    SDL_SetSurfaceAlphaMod(surface, a);
    SDL_SetSurfaceBlendMode(surface, blend);
}

References SDL_RenderCommand::data, SDL_RenderCommand::draw, SDL_BLENDMODE_ADD, SDL_BLENDMODE_MOD, SDL_BLENDMODE_MUL, SDL_SetSurfaceAlphaMod, SDL_SetSurfaceBlendMode, SDL_SetSurfaceColorMod, and SDL_SetSurfaceRLE.

Referenced by SW_RunCommandQueue().

SetDrawState()

static void SetDrawState ( SDL_Surface *  surface, SW_DrawStateCache *  drawstate  )

static

Definition at line 588 of file SDL_render_sw.c.

{
    if (drawstate->surface_cliprect_dirty) {
        const SDL_Rect *viewport = drawstate->viewport;
        const SDL_Rect *cliprect = drawstate->cliprect;
        SDL_assert(viewport != NULL);  /* the higher level should have forced a SDL_RENDERCMD_SETVIEWPORT */
 
        if (cliprect != NULL) {
            SDL_Rect clip_rect;
            clip_rect.x = cliprect->x + viewport->x;
            clip_rect.y = cliprect->y + viewport->y;
            clip_rect.w = cliprect->w;
            clip_rect.h = cliprect->h;
            SDL_IntersectRect(viewport, &clip_rect, &clip_rect);
            SDL_SetClipRect(surface, &clip_rect);
        } else {
            SDL_SetClipRect(surface, drawstate->viewport);
        }
        drawstate->surface_cliprect_dirty = SDL_FALSE;
    }
}

References SW_DrawStateCache::cliprect, SDL_Rect::h, NULL, SDL_assert, SDL_FALSE, SDL_IntersectRect, SDL_SetClipRect, SW_DrawStateCache::surface_cliprect_dirty, SW_DrawStateCache::viewport, viewport, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_RunCommandQueue().

SW_ActivateRenderer()

static SDL_Surface* SW_ActivateRenderer ( SDL_Renderer *  renderer )

static

Definition at line 54 of file SDL_render_sw.c.

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
 
    if (!data->surface) {
        data->surface = data->window;
    }
    if (!data->surface) {
        SDL_Surface *surface = SDL_GetWindowSurface(renderer->window);
        if (surface) {
            data->surface = data->window = surface;
        }
    }
    return data->surface;
}

References SDL_Renderer::driverdata, if, renderer, SDL_GetWindowSurface, and SDL_Renderer::window.

Referenced by SW_CreateRendererForSurface(), SW_RenderReadPixels(), and SW_RunCommandQueue().

SW_CreateRenderer()

static SDL_Renderer* SW_CreateRenderer ( SDL_Window *  window, Uint32  flags  )

static

Definition at line 860 of file SDL_render_sw.c.

{
    SDL_Surface *surface;
 
    surface = SDL_GetWindowSurface(window);
    if (!surface) {
        return NULL;
    }
    return SW_CreateRendererForSurface(surface);
}

References NULL, SDL_GetWindowSurface, and SW_CreateRendererForSurface().

SW_CreateRendererForSurface()

SDL_Renderer* SW_CreateRendererForSurface

(

SDL_Surface *

surface

)

Definition at line 806 of file SDL_render_sw.c.

{
    SDL_Renderer *renderer;
    SW_RenderData *data;
 
    if (!surface) {
        SDL_SetError("Can't create renderer for NULL surface");
        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;
    }
    data->surface = surface;
    data->window = surface;
 
    renderer->WindowEvent = SW_WindowEvent;
    renderer->GetOutputSize = SW_GetOutputSize;
    renderer->CreateTexture = SW_CreateTexture;
    renderer->UpdateTexture = SW_UpdateTexture;
    renderer->LockTexture = SW_LockTexture;
    renderer->UnlockTexture = SW_UnlockTexture;
    renderer->SetTextureScaleMode = SW_SetTextureScaleMode;
    renderer->SetRenderTarget = SW_SetRenderTarget;
    renderer->QueueSetViewport = SW_QueueSetViewport;
    renderer->QueueSetDrawColor = SW_QueueSetViewport;  /* SetViewport and SetDrawColor are (currently) no-ops. */
    renderer->QueueDrawPoints = SW_QueueDrawPoints;
    renderer->QueueDrawLines = SW_QueueDrawPoints;  /* lines and points queue vertices the same way. */
    renderer->QueueFillRects = SW_QueueFillRects;
    renderer->QueueCopy = SW_QueueCopy;
    renderer->QueueCopyEx = SW_QueueCopyEx;
    renderer->RunCommandQueue = SW_RunCommandQueue;
    renderer->RenderReadPixels = SW_RenderReadPixels;
    renderer->RenderPresent = SW_RenderPresent;
    renderer->DestroyTexture = SW_DestroyTexture;
    renderer->DestroyRenderer = SW_DestroyRenderer;
    renderer->info = SW_RenderDriver.info;
    renderer->driverdata = data;
 
    SW_ActivateRenderer(renderer);
 
    return renderer;
}

References SDL_Renderer::CreateTexture, SDL_Renderer::DestroyRenderer, SDL_Renderer::DestroyTexture, SDL_Renderer::driverdata, SDL_Renderer::GetOutputSize, SDL_Renderer::info, SDL_RenderDriver::info, SDL_Renderer::LockTexture, NULL, SDL_Renderer::QueueCopy, SDL_Renderer::QueueCopyEx, SDL_Renderer::QueueDrawLines, SDL_Renderer::QueueDrawPoints, SDL_Renderer::QueueFillRects, SDL_Renderer::QueueSetDrawColor, SDL_Renderer::QueueSetViewport, renderer, SDL_Renderer::RenderPresent, SDL_Renderer::RenderReadPixels, SDL_Renderer::RunCommandQueue, SDL_calloc, SDL_OutOfMemory, SDL_SetError, SDL_Renderer::SetRenderTarget, SDL_Renderer::SetTextureScaleMode, SW_ActivateRenderer(), SW_CreateTexture(), SW_DestroyRenderer(), SW_DestroyTexture(), SW_GetOutputSize(), SW_LockTexture(), SW_QueueCopy(), SW_QueueCopyEx(), SW_QueueDrawPoints(), SW_QueueFillRects(), SW_QueueSetViewport(), SW_RenderDriver, SW_RenderPresent(), SW_RenderReadPixels(), SW_RunCommandQueue(), SW_SetRenderTarget(), SW_SetTextureScaleMode(), SW_UnlockTexture(), SW_UpdateTexture(), SW_WindowEvent(), SDL_Renderer::UnlockTexture, SDL_Renderer::UpdateTexture, and SDL_Renderer::WindowEvent.

Referenced by SDL_CreateSoftwareRenderer(), and SW_CreateRenderer().

SW_CreateTexture()

static int SW_CreateTexture ( SDL_Renderer *  renderer, SDL_Texture *  texture  )

static

Definition at line 106 of file SDL_render_sw.c.

{
    int bpp;
    Uint32 Rmask, Gmask, Bmask, Amask;
 
    if (!SDL_PixelFormatEnumToMasks
        (texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
        return SDL_SetError("Unknown texture format");
    }
 
    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);
 
    /* Only RLE encode textures without an alpha channel since the RLE coder
     * discards the color values of pixels with an alpha value of zero.
     */
    if (texture->access == SDL_TEXTUREACCESS_STATIC && !Amask) {
        SDL_SetSurfaceRLE(texture->driverdata, 1);
    }
 
    if (!texture->driverdata) {
        return -1;
    }
    return 0;
}

References bpp, SDL_CreateRGBSurface, SDL_PixelFormatEnumToMasks, SDL_SetError, SDL_SetSurfaceAlphaMod, SDL_SetSurfaceBlendMode, SDL_SetSurfaceColorMod, SDL_SetSurfaceRLE, and SDL_TEXTUREACCESS_STATIC.

Referenced by SW_CreateRendererForSurface().

SW_DestroyRenderer()

static void SW_DestroyRenderer ( SDL_Renderer *  renderer )

static

Definition at line 797 of file SDL_render_sw.c.

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
 
    SDL_free(data);
    SDL_free(renderer);
}

References SDL_Renderer::driverdata, renderer, and SDL_free.

Referenced by SW_CreateRendererForSurface().

SW_DestroyTexture()

static void SW_DestroyTexture ( SDL_Renderer *  renderer, SDL_Texture *  texture  )

static

Definition at line 789 of file SDL_render_sw.c.

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
 
    SDL_FreeSurface(surface);
}

References SDL_FreeSurface.

Referenced by SW_CreateRendererForSurface().

SW_GetOutputSize()

static int SW_GetOutputSize ( SDL_Renderer *  renderer, int *  w, int *  h  )

static

Definition at line 82 of file SDL_render_sw.c.

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
 
    if (data->surface) {
        if (w) {
            *w = data->surface->w;
        }
        if (h) {
            *h = data->surface->h;
        }
        return 0;
    }
 
    if (renderer->window) {
        SDL_GetWindowSize(renderer->window, w, h);
        return 0;
    }
 
    SDL_SetError("Software renderer doesn't have an output surface");
    return -1;
}

References SDL_Renderer::driverdata, if, renderer, SDL_GetWindowSize, SDL_SetError, and SDL_Renderer::window.

Referenced by SW_CreateRendererForSurface().

SW_LockTexture()

static int SW_LockTexture ( SDL_Renderer *  renderer, SDL_Texture *  texture, const SDL_Rect *  rect, void **  pixels, int *  pitch  )

static

Definition at line 164 of file SDL_render_sw.c.

{
    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;
}

References SDL_Surface::pitch, rect, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

SW_QueueCopy()

static int SW_QueueCopy ( SDL_Renderer *  renderer, SDL_RenderCommand *  cmd, SDL_Texture *  texture, const SDL_Rect *  srcrect, const SDL_FRect *  dstrect  )

static

Definition at line 269 of file SDL_render_sw.c.

{
    SDL_Rect *verts = (SDL_Rect *) SDL_AllocateRenderVertices(renderer, 2 * sizeof (SDL_Rect), 0, &cmd->data.draw.first);
 
    if (!verts) {
        return -1;
    }
 
    cmd->data.draw.count = 1;
 
    SDL_memcpy(verts, srcrect, sizeof (SDL_Rect));
    verts++;
 
    if (renderer->viewport.x || renderer->viewport.y) {
        verts->x = (int)(renderer->viewport.x + dstrect->x);
        verts->y = (int)(renderer->viewport.y + dstrect->y);
    } else {
        verts->x = (int)dstrect->x;
        verts->y = (int)dstrect->y;
    }
    verts->w = (int)dstrect->w;
    verts->h = (int)dstrect->h;
 
    return 0;
}

References SDL_RenderCommand::data, SDL_RenderCommand::draw, SDL_Rect::h, SDL_FRect::h, int(), renderer, SDL_AllocateRenderVertices(), SDL_memcpy, SDL_Renderer::viewport, SDL_Rect::w, SDL_FRect::w, SDL_Rect::x, SDL_FRect::x, SDL_Rect::y, and SDL_FRect::y.

Referenced by SW_CreateRendererForSurface().

SW_QueueCopyEx()

static int SW_QueueCopyEx ( SDL_Renderer *  renderer, SDL_RenderCommand *  cmd, SDL_Texture *  texture, const SDL_Rect *  srcrect, const SDL_FRect *  dstrect, const double  angle, const SDL_FPoint *  center, const SDL_RendererFlip  flip  )

static

Definition at line 306 of file SDL_render_sw.c.

{
    CopyExData *verts = (CopyExData *) SDL_AllocateRenderVertices(renderer, sizeof (CopyExData), 0, &cmd->data.draw.first);
 
    if (!verts) {
        return -1;
    }
 
    cmd->data.draw.count = 1;
 
    SDL_memcpy(&verts->srcrect, srcrect, sizeof (SDL_Rect));
 
    if (renderer->viewport.x || renderer->viewport.y) {
        verts->dstrect.x = (int)(renderer->viewport.x + dstrect->x);
        verts->dstrect.y = (int)(renderer->viewport.y + dstrect->y);
    } else {
        verts->dstrect.x = (int)dstrect->x;
        verts->dstrect.y = (int)dstrect->y;
    }
    verts->dstrect.w = (int)dstrect->w;
    verts->dstrect.h = (int)dstrect->h;
    verts->angle = angle;
    SDL_memcpy(&verts->center, center, sizeof (SDL_FPoint));
    verts->flip = flip;
 
    return 0;
}

References CopyExData::angle, CopyExData::center, SDL_RenderCommand::data, SDL_RenderCommand::draw, CopyExData::dstrect, CopyExData::flip, SDL_Rect::h, SDL_FRect::h, int(), renderer, SDL_AllocateRenderVertices(), SDL_memcpy, CopyExData::srcrect, SDL_Renderer::viewport, SDL_Rect::w, SDL_FRect::w, SDL_Rect::x, SDL_FRect::x, SDL_Rect::y, and SDL_FRect::y.

Referenced by SW_CreateRendererForSurface().

SW_QueueDrawPoints()

static int SW_QueueDrawPoints ( SDL_Renderer *  renderer, SDL_RenderCommand *  cmd, const SDL_FPoint *  points, int  count  )

static

Definition at line 206 of file SDL_render_sw.c.

{
    SDL_Point *verts = (SDL_Point *) SDL_AllocateRenderVertices(renderer, count * sizeof (SDL_Point), 0, &cmd->data.draw.first);
    int i;
 
    if (!verts) {
        return -1;
    }
 
    cmd->data.draw.count = count;
 
    if (renderer->viewport.x || renderer->viewport.y) {
        const int x = renderer->viewport.x;
        const int y = renderer->viewport.y;
        for (i = 0; i < count; i++, verts++, points++) {
            verts->x = (int)(x + points->x);
            verts->y = (int)(y + points->y);
        }
    } else {
        for (i = 0; i < count; i++, verts++, points++) {
            verts->x = (int)points->x;
            verts->y = (int)points->y;
        }
    }
 
    return 0;
}

References SDL_RenderCommand::data, SDL_RenderCommand::draw, i, int(), renderer, SDL_AllocateRenderVertices(), SDL_Renderer::viewport, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

SW_QueueFillRects()

static int SW_QueueFillRects ( SDL_Renderer *  renderer, SDL_RenderCommand *  cmd, const SDL_FRect *  rects, int  count  )

static

Definition at line 235 of file SDL_render_sw.c.

{
    SDL_Rect *verts = (SDL_Rect *) SDL_AllocateRenderVertices(renderer, count * sizeof (SDL_Rect), 0, &cmd->data.draw.first);
    int i;
 
    if (!verts) {
        return -1;
    }
 
    cmd->data.draw.count = count;
 
    if (renderer->viewport.x || renderer->viewport.y) {
        const int x = renderer->viewport.x;
        const int y = renderer->viewport.y;
 
        for (i = 0; i < count; i++, verts++, rects++) {
            verts->x = (int)(x + rects->x);
            verts->y = (int)(y + rects->y);
            verts->w = SDL_max((int)rects->w, 1);
            verts->h = SDL_max((int)rects->h, 1);
        }
    } else {
        for (i = 0; i < count; i++, verts++, rects++) {
            verts->x = (int)rects->x;
            verts->y = (int)rects->y;
            verts->w = SDL_max((int)rects->w, 1);
            verts->h = SDL_max((int)rects->h, 1);
        }
    }
 
    return 0;
}

References SDL_RenderCommand::data, SDL_RenderCommand::draw, i, int(), renderer, SDL_AllocateRenderVertices(), SDL_max, SDL_Renderer::viewport, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

SW_QueueSetViewport()

static int SW_QueueSetViewport ( SDL_Renderer *  renderer, SDL_RenderCommand *  cmd  )

static

Definition at line 200 of file SDL_render_sw.c.

{
    return 0;  /* nothing to do in this backend. */
}

Referenced by SW_CreateRendererForSurface().

SW_RenderCopyEx()

static int SW_RenderCopyEx ( SDL_Renderer *  renderer, SDL_Surface *  surface, SDL_Texture *  texture, const SDL_Rect *  srcrect, const SDL_Rect *  final_rect, const double  angle, const SDL_FPoint *  center, const SDL_RendererFlip  flip  )

static

Definition at line 337 of file SDL_render_sw.c.

{
    SDL_Surface *src = (SDL_Surface *) texture->driverdata;
    SDL_Rect tmp_rect;
    SDL_Surface *src_clone, *src_rotated, *src_scaled;
    SDL_Surface *mask = NULL, *mask_rotated = NULL;
    int retval = 0, dstwidth, dstheight, abscenterx, abscentery;
    double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
    SDL_BlendMode blendmode;
    Uint8 alphaMod, rMod, gMod, bMod;
    int applyModulation = SDL_FALSE;
    int blitRequired = SDL_FALSE;
    int isOpaque = SDL_FALSE;
 
    if (!surface) {
        return -1;
    }
 
    tmp_rect.x = 0;
    tmp_rect.y = 0;
    tmp_rect.w = final_rect->w;
    tmp_rect.h = final_rect->h;
 
    /* It is possible to encounter an RLE encoded surface here and locking it is
     * necessary because this code is going to access the pixel buffer directly.
     */
    if (SDL_MUSTLOCK(src)) {
        SDL_LockSurface(src);
    }
 
    /* Clone the source surface but use its pixel buffer directly.
     * The original source surface must be treated as read-only.
     */
    src_clone = SDL_CreateRGBSurfaceFrom(src->pixels, src->w, src->h, src->format->BitsPerPixel, src->pitch,
                                         src->format->Rmask, src->format->Gmask,
                                         src->format->Bmask, src->format->Amask);
    if (src_clone == NULL) {
        if (SDL_MUSTLOCK(src)) {
            SDL_UnlockSurface(src);
        }
        return -1;
    }
 
    SDL_GetSurfaceBlendMode(src, &blendmode);
    SDL_GetSurfaceAlphaMod(src, &alphaMod);
    SDL_GetSurfaceColorMod(src, &rMod, &gMod, &bMod);
 
    /* SDLgfx_rotateSurface only accepts 32-bit surfaces with a 8888 layout. Everything else has to be converted. */
    if (src->format->BitsPerPixel != 32 || SDL_PIXELLAYOUT(src->format->format) != SDL_PACKEDLAYOUT_8888 || !src->format->Amask) {
        blitRequired = SDL_TRUE;
    }
 
    /* If scaling and cropping is necessary, it has to be taken care of before the rotation. */
    if (!(srcrect->w == final_rect->w && srcrect->h == final_rect->h && srcrect->x == 0 && srcrect->y == 0)) {
        blitRequired = SDL_TRUE;
    }
 
    /* srcrect is not selecting the whole src surface, so cropping is needed */
    if (!(srcrect->w == src->w && srcrect->h == src->h && srcrect->x == 0 && srcrect->y == 0)) {
        blitRequired = SDL_TRUE;
    }
 
    /* The color and alpha modulation has to be applied before the rotation when using the NONE, MOD or MUL blend modes. */
    if ((blendmode == SDL_BLENDMODE_NONE || blendmode == SDL_BLENDMODE_MOD || blendmode == SDL_BLENDMODE_MUL) && (alphaMod & rMod & gMod & bMod) != 255) {
        applyModulation = SDL_TRUE;
        SDL_SetSurfaceAlphaMod(src_clone, alphaMod);
        SDL_SetSurfaceColorMod(src_clone, rMod, gMod, bMod);
    }
 
    /* Opaque surfaces are much easier to handle with the NONE blend mode. */
    if (blendmode == SDL_BLENDMODE_NONE && !src->format->Amask && alphaMod == 255) {
        isOpaque = SDL_TRUE;
    }
 
    /* The NONE blend mode requires a mask for non-opaque surfaces. This mask will be used
     * to clear the pixels in the destination surface. The other steps are explained below.
     */
    if (blendmode == SDL_BLENDMODE_NONE && !isOpaque) {
        mask = SDL_CreateRGBSurface(0, final_rect->w, final_rect->h, 32,
                                    0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
        if (mask == NULL) {
            retval = -1;
        } else {
            SDL_SetSurfaceBlendMode(mask, SDL_BLENDMODE_MOD);
        }
    }
 
    /* Create a new surface should there be a format mismatch or if scaling, cropping,
     * or modulation is required. It's possible to use the source surface directly otherwise.
     */
    if (!retval && (blitRequired || applyModulation)) {
        SDL_Rect scale_rect = tmp_rect;
        src_scaled = SDL_CreateRGBSurface(0, final_rect->w, final_rect->h, 32,
                                          0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
        if (src_scaled == NULL) {
            retval = -1;
        } else {
            SDL_SetSurfaceBlendMode(src_clone, SDL_BLENDMODE_NONE);
            retval = SDL_BlitScaled(src_clone, srcrect, src_scaled, &scale_rect);
            SDL_FreeSurface(src_clone);
            src_clone = src_scaled;
            src_scaled = NULL;
        }
    }
 
    /* SDLgfx_rotateSurface is going to make decisions depending on the blend mode. */
    SDL_SetSurfaceBlendMode(src_clone, blendmode);
 
    if (!retval) {
        SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, angle, &dstwidth, &dstheight, &cangle, &sangle);
        src_rotated = SDLgfx_rotateSurface(src_clone, angle, dstwidth/2, dstheight/2, (texture->scaleMode == SDL_ScaleModeNearest) ? 0 : 1, flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
        if (src_rotated == NULL) {
            retval = -1;
        }
        if (!retval && mask != NULL) {
            /* The mask needed for the NONE blend mode gets rotated with the same parameters. */
            mask_rotated = SDLgfx_rotateSurface(mask, angle, dstwidth/2, dstheight/2, SDL_FALSE, 0, 0, dstwidth, dstheight, cangle, sangle);
            if (mask_rotated == NULL) {
                retval = -1;
            }
        }
        if (!retval) {
            /* Find out where the new origin is by rotating the four final_rect points around the center and then taking the extremes */
            abscenterx = final_rect->x + (int)center->x;
            abscentery = final_rect->y + (int)center->y;
            /* Compensate the angle inversion to match the behaviour of the other backends */
            sangle = -sangle;
 
            /* Top Left */
            px = final_rect->x - abscenterx;
            py = final_rect->y - abscentery;
            p1x = px * cangle - py * sangle + abscenterx;
            p1y = px * sangle + py * cangle + abscentery;
 
            /* Top Right */
            px = final_rect->x + final_rect->w - abscenterx;
            py = final_rect->y - abscentery;
            p2x = px * cangle - py * sangle + abscenterx;
            p2y = px * sangle + py * cangle + abscentery;
 
            /* Bottom Left */
            px = final_rect->x - abscenterx;
            py = final_rect->y + final_rect->h - abscentery;
            p3x = px * cangle - py * sangle + abscenterx;
            p3y = px * sangle + py * cangle + abscentery;
 
            /* Bottom Right */
            px = final_rect->x + final_rect->w - abscenterx;
            py = final_rect->y + final_rect->h - abscentery;
            p4x = px * cangle - py * sangle + abscenterx;
            p4y = px * sangle + py * cangle + abscentery;
 
            tmp_rect.x = (int)MIN(MIN(p1x, p2x), MIN(p3x, p4x));
            tmp_rect.y = (int)MIN(MIN(p1y, p2y), MIN(p3y, p4y));
            tmp_rect.w = dstwidth;
            tmp_rect.h = dstheight;
 
            /* The NONE blend mode needs some special care with non-opaque surfaces.
             * Other blend modes or opaque surfaces can be blitted directly.
             */
            if (blendmode != SDL_BLENDMODE_NONE || isOpaque) {
                if (applyModulation == SDL_FALSE) {
                    /* If the modulation wasn't already applied, make it happen now. */
                    SDL_SetSurfaceAlphaMod(src_rotated, alphaMod);
                    SDL_SetSurfaceColorMod(src_rotated, rMod, gMod, bMod);
                }
                retval = SDL_BlitSurface(src_rotated, NULL, surface, &tmp_rect);
            } else {
                /* The NONE blend mode requires three steps to get the pixels onto the destination surface.
                 * First, the area where the rotated pixels will be blitted to get set to zero.
                 * This is accomplished by simply blitting a mask with the NONE blend mode.
                 * The colorkey set by the rotate function will discard the correct pixels.
                 */
                SDL_Rect mask_rect = tmp_rect;
                SDL_SetSurfaceBlendMode(mask_rotated, SDL_BLENDMODE_NONE);
                retval = SDL_BlitSurface(mask_rotated, NULL, surface, &mask_rect);
                if (!retval) {
                    /* The next step copies the alpha value. This is done with the BLEND blend mode and
                     * by modulating the source colors with 0. Since the destination is all zeros, this
                     * will effectively set the destination alpha to the source alpha.
                     */
                    SDL_SetSurfaceColorMod(src_rotated, 0, 0, 0);
                    mask_rect = tmp_rect;
                    retval = SDL_BlitSurface(src_rotated, NULL, surface, &mask_rect);
                    if (!retval) {
                        /* The last step gets the color values in place. The ADD blend mode simply adds them to
                         * the destination (where the color values are all zero). However, because the ADD blend
                         * mode modulates the colors with the alpha channel, a surface without an alpha mask needs
                         * to be created. This makes all source pixels opaque and the colors get copied correctly.
                         */
                        SDL_Surface *src_rotated_rgb;
                        src_rotated_rgb = SDL_CreateRGBSurfaceFrom(src_rotated->pixels, src_rotated->w, src_rotated->h,
                                                                   src_rotated->format->BitsPerPixel, src_rotated->pitch,
                                                                   src_rotated->format->Rmask, src_rotated->format->Gmask,
                                                                   src_rotated->format->Bmask, 0);
                        if (src_rotated_rgb == NULL) {
                            retval = -1;
                        } else {
                            SDL_SetSurfaceBlendMode(src_rotated_rgb, SDL_BLENDMODE_ADD);
                            retval = SDL_BlitSurface(src_rotated_rgb, NULL, surface, &tmp_rect);
                            SDL_FreeSurface(src_rotated_rgb);
                        }
                    }
                }
                SDL_FreeSurface(mask_rotated);
            }
            if (src_rotated != NULL) {
                SDL_FreeSurface(src_rotated);
            }
        }
    }
 
    if (SDL_MUSTLOCK(src)) {
        SDL_UnlockSurface(src);
    }
    if (mask != NULL) {
        SDL_FreeSurface(mask);
    }
    if (src_clone != NULL) {
        SDL_FreeSurface(src_clone);
    }
    return retval;
}

References SDL_Rect::h, if, int(), MIN, NULL, retval, SDL_BLENDMODE_ADD, SDL_BLENDMODE_MOD, SDL_BLENDMODE_MUL, SDL_BLENDMODE_NONE, SDL_BlitScaled, SDL_BlitSurface, SDL_CreateRGBSurface, SDL_CreateRGBSurfaceFrom, SDL_FALSE, SDL_FLIP_HORIZONTAL, SDL_FLIP_VERTICAL, SDL_FreeSurface, SDL_GetSurfaceAlphaMod, SDL_GetSurfaceBlendMode, SDL_GetSurfaceColorMod, SDL_LockSurface, SDL_MUSTLOCK, SDL_PACKEDLAYOUT_8888, SDL_PIXELLAYOUT, SDL_ScaleModeNearest, SDL_SetSurfaceAlphaMod, SDL_SetSurfaceBlendMode, SDL_SetSurfaceColorMod, SDL_TRUE, SDL_UnlockSurface, SDLgfx_rotateSurface(), SDLgfx_rotozoomSurfaceSizeTrig(), SDL_Rect::w, SDL_FPoint::x, SDL_Rect::x, SDL_FPoint::y, and SDL_Rect::y.

Referenced by SW_RunCommandQueue().

SW_RenderPresent()

static void SW_RenderPresent ( SDL_Renderer *  renderer )

static

Definition at line 779 of file SDL_render_sw.c.

{
    SDL_Window *window = renderer->window;
 
    if (window) {
        SDL_UpdateWindowSurface(window);
    }
}

References renderer, SDL_UpdateWindowSurface, and SDL_Renderer::window.

Referenced by SW_CreateRendererForSurface().

SW_RenderReadPixels()

static int SW_RenderReadPixels ( SDL_Renderer *  renderer, const SDL_Rect *  rect, Uint32  format, void *  pixels, int  pitch  )

static

Definition at line 748 of file SDL_render_sw.c.

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    Uint32 src_format;
    void *src_pixels;
 
    if (!surface) {
        return -1;
    }
 
    /* NOTE: The rect is already adjusted according to the viewport by
     * SDL_RenderReadPixels.
     */
 
    if (rect->x < 0 || rect->x+rect->w > surface->w ||
        rect->y < 0 || rect->y+rect->h > surface->h) {
        return SDL_SetError("Tried to read outside of surface bounds");
    }
 
    src_format = surface->format->format;
    src_pixels = (void*)((Uint8 *) surface->pixels +
                    rect->y * surface->pitch +
                    rect->x * surface->format->BytesPerPixel);
 
    return SDL_ConvertPixels(rect->w, rect->h,
                             src_format, src_pixels, surface->pitch,
                             format, pixels, pitch);
}

References SDL_Rect::h, rect, renderer, SDL_ConvertPixels, SDL_SetError, SW_ActivateRenderer(), SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

SW_RunCommandQueue()

static int SW_RunCommandQueue ( SDL_Renderer *  renderer, SDL_RenderCommand *  cmd, void *  vertices, size_t  vertsize  )

static

Definition at line 611 of file SDL_render_sw.c.

{
    SDL_Surface *surface = SW_ActivateRenderer(renderer);
    SW_DrawStateCache drawstate;
 
    if (!surface) {
        return -1;
    }
 
    drawstate.viewport = NULL;
    drawstate.cliprect = NULL;
    drawstate.surface_cliprect_dirty = SDL_TRUE;
 
    while (cmd) {
        switch (cmd->command) {
            case SDL_RENDERCMD_SETDRAWCOLOR: {
                break;  /* Not used in this backend. */
            }
 
            case SDL_RENDERCMD_SETVIEWPORT: {
                drawstate.viewport = &cmd->data.viewport.rect;
                drawstate.surface_cliprect_dirty = SDL_TRUE;
                break;
            }
 
            case SDL_RENDERCMD_SETCLIPRECT: {
                drawstate.cliprect = cmd->data.cliprect.enabled ? &cmd->data.cliprect.rect : NULL;                
                drawstate.surface_cliprect_dirty = SDL_TRUE;
                break;
            }
 
            case SDL_RENDERCMD_CLEAR: {
                const Uint8 r = cmd->data.color.r;
                const Uint8 g = cmd->data.color.g;
                const Uint8 b = cmd->data.color.b;
                const Uint8 a = cmd->data.color.a;
                /* By definition the clear ignores the clip rect */
                SDL_SetClipRect(surface, NULL);
                SDL_FillRect(surface, NULL, SDL_MapRGBA(surface->format, r, g, b, a));
                drawstate.surface_cliprect_dirty = SDL_TRUE;
                break;
            }
 
            case SDL_RENDERCMD_DRAW_POINTS: {
                const Uint8 r = cmd->data.draw.r;
                const Uint8 g = cmd->data.draw.g;
                const Uint8 b = cmd->data.draw.b;
                const Uint8 a = cmd->data.draw.a;
                const int count = (int) cmd->data.draw.count;
                const SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first);
                const SDL_BlendMode blend = cmd->data.draw.blend;
                SetDrawState(surface, &drawstate);
                if (blend == SDL_BLENDMODE_NONE) {
                    SDL_DrawPoints(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
                } else {
                    SDL_BlendPoints(surface, verts, count, blend, r, g, b, a);
                }
                break;
            }
 
            case SDL_RENDERCMD_DRAW_LINES: {
                const Uint8 r = cmd->data.draw.r;
                const Uint8 g = cmd->data.draw.g;
                const Uint8 b = cmd->data.draw.b;
                const Uint8 a = cmd->data.draw.a;
                const int count = (int) cmd->data.draw.count;
                const SDL_Point *verts = (SDL_Point *) (((Uint8 *) vertices) + cmd->data.draw.first);
                const SDL_BlendMode blend = cmd->data.draw.blend;
                SetDrawState(surface, &drawstate);
                if (blend == SDL_BLENDMODE_NONE) {
                    SDL_DrawLines(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
                } else {
                    SDL_BlendLines(surface, verts, count, blend, r, g, b, a);
                }
                break;
            }
 
            case SDL_RENDERCMD_FILL_RECTS: {
                const Uint8 r = cmd->data.draw.r;
                const Uint8 g = cmd->data.draw.g;
                const Uint8 b = cmd->data.draw.b;
                const Uint8 a = cmd->data.draw.a;
                const int count = (int) cmd->data.draw.count;
                const SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first);
                const SDL_BlendMode blend = cmd->data.draw.blend;
                SetDrawState(surface, &drawstate);
                if (blend == SDL_BLENDMODE_NONE) {
                    SDL_FillRects(surface, verts, count, SDL_MapRGBA(surface->format, r, g, b, a));
                } else {
                    SDL_BlendFillRects(surface, verts, count, blend, r, g, b, a);
                }
                break;
            }
 
            case SDL_RENDERCMD_COPY: {
                SDL_Rect *verts = (SDL_Rect *) (((Uint8 *) vertices) + cmd->data.draw.first);
                const SDL_Rect *srcrect = verts;
                SDL_Rect *dstrect = verts + 1;
                SDL_Texture *texture = cmd->data.draw.texture;
                SDL_Surface *src = (SDL_Surface *) texture->driverdata;
 
                SetDrawState(surface, &drawstate);
 
                PrepTextureForCopy(cmd);
 
                if ( srcrect->w == dstrect->w && srcrect->h == dstrect->h ) {
                    SDL_BlitSurface(src, srcrect, surface, dstrect);
                } else {
                    /* If scaling is ever done, permanently disable RLE (which doesn't support scaling)
                     * to avoid potentially frequent RLE encoding/decoding.
                     */
                    SDL_SetSurfaceRLE(surface, 0);
                    SDL_BlitScaled(src, srcrect, surface, dstrect);
                }
                break;
            }
 
            case SDL_RENDERCMD_COPY_EX: {
                const CopyExData *copydata = (CopyExData *) (((Uint8 *) vertices) + cmd->data.draw.first);
                SetDrawState(surface, &drawstate);
                PrepTextureForCopy(cmd);
                SW_RenderCopyEx(renderer, surface, cmd->data.draw.texture, &copydata->srcrect,
                                &copydata->dstrect, copydata->angle, &copydata->center, copydata->flip);
                break;
            }
 
            case SDL_RENDERCMD_NO_OP:
                break;
        }
 
        cmd = cmd->next;
    }
 
    return 0;
}

References CopyExData::angle, CopyExData::center, SDL_RenderCommand::cliprect, SW_DrawStateCache::cliprect, SDL_RenderCommand::color, SDL_RenderCommand::command, SDL_RenderCommand::data, SDL_RenderCommand::draw, CopyExData::dstrect, CopyExData::flip, SDL_Rect::h, int(), SDL_RenderCommand::next, NULL, PrepTextureForCopy(), renderer, SDL_BlendFillRects(), SDL_BlendLines(), SDL_BLENDMODE_NONE, SDL_BlendPoints(), SDL_BlitScaled, SDL_BlitSurface, SDL_DrawLines(), SDL_DrawPoints(), SDL_FillRect, SDL_FillRects, SDL_MapRGBA, SDL_RENDERCMD_CLEAR, SDL_RENDERCMD_COPY, SDL_RENDERCMD_COPY_EX, SDL_RENDERCMD_DRAW_LINES, SDL_RENDERCMD_DRAW_POINTS, SDL_RENDERCMD_FILL_RECTS, SDL_RENDERCMD_NO_OP, SDL_RENDERCMD_SETCLIPRECT, SDL_RENDERCMD_SETDRAWCOLOR, SDL_RENDERCMD_SETVIEWPORT, SDL_SetClipRect, SDL_SetSurfaceRLE, SDL_TRUE, SetDrawState(), CopyExData::srcrect, SW_DrawStateCache::surface_cliprect_dirty, SW_ActivateRenderer(), SW_RenderCopyEx(), SDL_RenderCommand::viewport, SW_DrawStateCache::viewport, and SDL_Rect::w.

Referenced by SW_CreateRendererForSurface().

SW_SetRenderTarget()

static int SW_SetRenderTarget ( SDL_Renderer *  renderer, SDL_Texture *  texture  )

static

Definition at line 187 of file SDL_render_sw.c.

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
 
    if (texture) {
        data->surface = (SDL_Surface *) texture->driverdata;
    } else {
        data->surface = data->window;
    }
    return 0;
}

References SDL_Renderer::driverdata, if, and renderer.

Referenced by SW_CreateRendererForSurface().

SW_SetTextureScaleMode()

static void SW_SetTextureScaleMode ( SDL_Renderer *  renderer, SDL_Texture *  texture, SDL_ScaleMode  scaleMode  )

static

Definition at line 182 of file SDL_render_sw.c.

{
}

Referenced by SW_CreateRendererForSurface().

SW_UnlockTexture()

static void SW_UnlockTexture ( SDL_Renderer *  renderer, SDL_Texture *  texture  )

static

Definition at line 177 of file SDL_render_sw.c.

{
}

Referenced by SW_CreateRendererForSurface().

SW_UpdateTexture()

static int SW_UpdateTexture ( SDL_Renderer *  renderer, SDL_Texture *  texture, const SDL_Rect *  rect, const void *  pixels, int  pitch  )

static

Definition at line 138 of file SDL_render_sw.c.

{
    SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
    Uint8 *src, *dst;
    int row;
    size_t length;
 
    if(SDL_MUSTLOCK(surface))
        SDL_LockSurface(surface);
    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;
    }
    if(SDL_MUSTLOCK(surface))
        SDL_UnlockSurface(surface);
    return 0;
}

References SDL_Rect::h, rect, SDL_LockSurface, SDL_memcpy, SDL_MUSTLOCK, SDL_UnlockSurface, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

Referenced by SW_CreateRendererForSurface().

SW_WindowEvent()

static void SW_WindowEvent ( SDL_Renderer *  renderer, const SDL_WindowEvent *  event  )

static

Definition at line 71 of file SDL_render_sw.c.

{
    SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
 
    if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
        data->surface = NULL;
        data->window = NULL;
    }
}

References SDL_Renderer::driverdata, if, NULL, renderer, and SDL_WINDOWEVENT_SIZE_CHANGED.

Referenced by SW_CreateRendererForSurface().

Variable Documentation

SW_RenderDriver

SDL_RenderDriver SW_RenderDriver

Initial value:

= {
    SW_CreateRenderer,
    {
     "software",
     SDL_RENDERER_SOFTWARE | SDL_RENDERER_TARGETTEXTURE,
     8,
     {
      SDL_PIXELFORMAT_ARGB8888,
      SDL_PIXELFORMAT_ABGR8888,
      SDL_PIXELFORMAT_RGBA8888,
      SDL_PIXELFORMAT_BGRA8888,
      SDL_PIXELFORMAT_RGB888,
      SDL_PIXELFORMAT_BGR888,
      SDL_PIXELFORMAT_RGB565,
      SDL_PIXELFORMAT_RGB555
     },
     0,
     0}
}

Definition at line 871 of file SDL_render_sw.c.

Referenced by SW_CreateRendererForSurface().