static int
SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = (int)(renderer->viewport.x + dstrect->x);
final_rect.y = (int)(renderer->viewport.y + dstrect->y);
} else {
final_rect.x = (int)dstrect->x;
final_rect.y = (int)dstrect->y;
}
final_rect.w = (int)dstrect->w;
final_rect.h = (int)dstrect->h;
if ( srcrect->w == final_rect.w && srcrect->h == final_rect.h ) {
return SDL_BlitSurface(src, srcrect, surface, &final_rect);
} 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);
return SDL_BlitScaled(src, srcrect, surface, &final_rect);
}
}
static int
SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 format, void * pixels, int pitch)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
Uint32 src_format;
void *src_pixels;
if (!surface) {
return -1;
}
if (rect->x < 0 || rect->x+rect->w > surface->w ||
rect->y < 0 || rect->y+rect->h > surface->h) {
SDL_SetError("Tried to read outside of surface bounds");
return -1;
}
src_format = SDL_MasksToPixelFormatEnum(
surface->format->BitsPerPixel,
surface->format->Rmask, surface->format->Gmask,
surface->format->Bmask, surface->format->Amask);
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);
}
static int
SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 format, void * pixels, int pitch)
{
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);
}
static int
SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = (int)(renderer->viewport.x + dstrect->x);
final_rect.y = (int)(renderer->viewport.y + dstrect->y);
} else {
final_rect.x = (int)dstrect->x;
final_rect.y = (int)dstrect->y;
}
final_rect.w = (int)dstrect->w;
final_rect.h = (int)dstrect->h;
if ( srcrect->w == final_rect.w && srcrect->h == final_rect.h ) {
return SDL_BlitSurface(src, srcrect, surface, &final_rect);
} else {
return SDL_BlitScaled(src, srcrect, surface, &final_rect);
}
}
static int
SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 format, void * pixels, int pitch)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
Uint32 src_format;
void *src_pixels;
SDL_Rect final_rect;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = renderer->viewport.x + rect->x;
final_rect.y = renderer->viewport.y + rect->y;
final_rect.w = rect->w;
final_rect.h = rect->h;
rect = &final_rect;
}
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);
}
SDL_Renderer *
SW_CreateRendererForSurface(SDL_Surface * surface)
{
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->SetTextureColorMod = SW_SetTextureColorMod;
renderer->SetTextureAlphaMod = SW_SetTextureAlphaMod;
renderer->SetTextureBlendMode = SW_SetTextureBlendMode;
renderer->UpdateTexture = SW_UpdateTexture;
renderer->LockTexture = SW_LockTexture;
renderer->UnlockTexture = SW_UnlockTexture;
renderer->SetRenderTarget = SW_SetRenderTarget;
renderer->UpdateViewport = SW_UpdateViewport;
renderer->UpdateClipRect = SW_UpdateClipRect;
renderer->RenderClear = SW_RenderClear;
renderer->RenderDrawPoints = SW_RenderDrawPoints;
renderer->RenderDrawLines = SW_RenderDrawLines;
renderer->RenderFillRects = SW_RenderFillRects;
renderer->RenderCopy = SW_RenderCopy;
renderer->RenderCopyEx = SW_RenderCopyEx;
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;
}
SDL_Renderer *
SW_CreateRendererForSurface(SDL_Surface * surface)
{
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->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;
}
static int
SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_Rect * dstrect)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect = *dstrect;
if (!surface) {
return -1;
}
return SDL_BlitSurface(src, srcrect, surface, &final_rect);
}
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_RenderFillRects(SDL_Renderer * renderer, const SDL_FRect * rects, int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Rect *final_rects;
int i, status;
if (!surface) {
return -1;
}
final_rects = SDL_stack_alloc(SDL_Rect, count);
if (!final_rects) {
return SDL_OutOfMemory();
}
if (renderer->viewport.x || renderer->viewport.y) {
int x = renderer->viewport.x;
int y = renderer->viewport.y;
for (i = 0; i < count; ++i) {
final_rects[i].x = (int)(x + rects[i].x);
final_rects[i].y = (int)(y + rects[i].y);
final_rects[i].w = SDL_max((int)rects[i].w, 1);
final_rects[i].h = SDL_max((int)rects[i].h, 1);
}
} else {
for (i = 0; i < count; ++i) {
final_rects[i].x = (int)rects[i].x;
final_rects[i].y = (int)rects[i].y;
final_rects[i].w = SDL_max((int)rects[i].w, 1);
final_rects[i].h = SDL_max((int)rects[i].h, 1);
}
}
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
status = SDL_FillRects(surface, final_rects, count, color);
} else {
status = SDL_BlendFillRects(surface, final_rects, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
SDL_stack_free(final_rects);
return status;
}
static int
SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_FPoint * points,
int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Point *final_points;
int i, status;
if (!surface) {
return -1;
}
final_points = SDL_stack_alloc(SDL_Point, count);
if (!final_points) {
return SDL_OutOfMemory();
}
if (renderer->viewport.x || renderer->viewport.y) {
int x = renderer->viewport.x;
int y = renderer->viewport.y;
for (i = 0; i < count; ++i) {
final_points[i].x = (int)(x + points[i].x);
final_points[i].y = (int)(y + points[i].y);
}
} else {
for (i = 0; i < count; ++i) {
final_points[i].x = (int)points[i].x;
final_points[i].y = (int)points[i].y;
}
}
/* Draw the lines! */
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
status = SDL_DrawLines(surface, final_points, count, color);
} else {
status = SDL_BlendLines(surface, final_points, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
SDL_stack_free(final_points);
return status;
}
static int
SW_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
if (surface) {
if (w) {
*w = surface->w;
}
if (h) {
*h = surface->h;
}
return 0;
} else {
SDL_SetError("Software renderer doesn't have an output surface");
return -1;
}
}
static int
SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Point *temp = NULL;
int status;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
int i;
int x = renderer->viewport.x;
int y = renderer->viewport.y;
temp = SDL_stack_alloc(SDL_Point, count);
for (i = 0; i < count; ++i) {
temp[i].x = x + points[i].x;
temp[i].y = y + points[i].y;
}
points = temp;
}
/* Draw the lines! */
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
status = SDL_DrawLines(surface, points, count, color);
} else {
status = SDL_BlendLines(surface, points, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
if (temp) {
SDL_stack_free(temp);
}
return status;
}
static int
SW_RenderClear(SDL_Renderer * renderer)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
Uint32 color;
SDL_Rect clip_rect;
if (!surface) {
return -1;
}
color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b, renderer->a);
/* By definition the clear ignores the clip rect */
clip_rect = surface->clip_rect;
SDL_SetClipRect(surface, NULL);
SDL_FillRect(surface, NULL, color);
SDL_SetClipRect(surface, &clip_rect);
return 0;
}
static int
SW_RenderFillRects(SDL_Renderer * renderer, const SDL_Rect ** rects,
int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
if (!surface) {
return -1;
}
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
return SDL_FillRects(surface, rects, count, color);
} else {
return SDL_BlendFillRects(surface, rects, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
}
static int
SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_Point * points,
int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
if (!surface) {
return -1;
}
/* Draw the lines! */
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
return SDL_DrawLines(surface, points, count, color);
} else {
return SDL_BlendLines(surface, points, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
}
static int
SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect, tmp_rect;
SDL_Surface *surface_rotated, *surface_scaled;
Uint32 colorkey;
int retval, dstwidth, dstheight, abscenterx, abscentery;
double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = (int)(renderer->viewport.x + dstrect->x);
final_rect.y = (int)(renderer->viewport.y + dstrect->y);
} else {
final_rect.x = (int)dstrect->x;
final_rect.y = (int)dstrect->y;
}
final_rect.w = (int)dstrect->w;
final_rect.h = (int)dstrect->h;
surface_scaled = SDL_CreateRGBSurface(SDL_SWSURFACE, final_rect.w, final_rect.h, src->format->BitsPerPixel,
src->format->Rmask, src->format->Gmask,
src->format->Bmask, src->format->Amask );
if (surface_scaled) {
SDL_GetColorKey(src, &colorkey);
SDL_SetColorKey(surface_scaled, SDL_TRUE, colorkey);
tmp_rect = final_rect;
tmp_rect.x = 0;
tmp_rect.y = 0;
retval = SDL_BlitScaled(src, srcrect, surface_scaled, &tmp_rect);
if (!retval) {
SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, -angle, &dstwidth, &dstheight, &cangle, &sangle);
surface_rotated = SDLgfx_rotateSurface(surface_scaled, -angle, dstwidth/2, dstheight/2, GetScaleQuality(), flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
if(surface_rotated) {
/* 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;
retval = SDL_BlitSurface(surface_rotated, NULL, surface, &tmp_rect);
SDL_FreeSurface(surface_scaled);
SDL_FreeSurface(surface_rotated);
return retval;
}
}
return retval;
}
return -1;
}
static int
SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect, tmp_rect;
SDL_Surface *surface_rotated, *surface_scaled;
int retval, dstwidth, dstheight, abscenterx, abscentery;
double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = (int)(renderer->viewport.x + dstrect->x);
final_rect.y = (int)(renderer->viewport.y + dstrect->y);
} else {
final_rect.x = (int)dstrect->x;
final_rect.y = (int)dstrect->y;
}
final_rect.w = (int)dstrect->w;
final_rect.h = (int)dstrect->h;
/* SDLgfx_rotateSurface doesn't accept a source rectangle, so crop and scale if we need to */
tmp_rect = final_rect;
tmp_rect.x = 0;
tmp_rect.y = 0;
if (srcrect->w == final_rect.w && srcrect->h == final_rect.h && srcrect->x == 0 && srcrect->y == 0) {
surface_scaled = src; /* but if we don't need to, just use the original */
retval = 0;
} else {
SDL_Surface *blit_src = src;
Uint32 colorkey;
SDL_BlendMode blendMode;
Uint8 alphaMod, r, g, b;
SDL_bool cloneSource = SDL_FALSE;
surface_scaled = SDL_CreateRGBSurface(SDL_SWSURFACE, final_rect.w, final_rect.h, src->format->BitsPerPixel,
src->format->Rmask, src->format->Gmask,
src->format->Bmask, src->format->Amask );
if (!surface_scaled) {
return -1;
}
/* copy the color key, alpha mod, blend mode, and color mod so the scaled surface behaves like the source */
if (SDL_GetColorKey(src, &colorkey) == 0) {
SDL_SetColorKey(surface_scaled, SDL_TRUE, colorkey);
cloneSource = SDL_TRUE;
}
SDL_GetSurfaceAlphaMod(src, &alphaMod); /* these will be copied to surface_scaled below if necessary */
SDL_GetSurfaceBlendMode(src, &blendMode);
SDL_GetSurfaceColorMod(src, &r, &g, &b);
/* now we need to blit the src into surface_scaled. since we want to copy the colors from the source to
* surface_scaled rather than blend them, etc. we'll need to disable the blend mode, alpha mod, etc.
* but we don't want to modify src (in case it's being used on other threads), so we'll need to clone it
* before changing the blend options
*/
cloneSource |= blendMode != SDL_BLENDMODE_NONE || (alphaMod & r & g & b) != 255;
if (cloneSource) {
blit_src = SDL_ConvertSurface(src, src->format, src->flags); /* clone src */
if (!blit_src) {
SDL_FreeSurface(surface_scaled);
return -1;
}
SDL_SetSurfaceAlphaMod(blit_src, 255); /* disable all blending options in blit_src */
SDL_SetSurfaceBlendMode(blit_src, SDL_BLENDMODE_NONE);
SDL_SetColorKey(blit_src, 0, 0);
SDL_SetSurfaceColorMod(blit_src, 255, 255, 255);
SDL_SetSurfaceRLE(blit_src, 0); /* don't RLE encode a surface we'll only use once */
SDL_SetSurfaceAlphaMod(surface_scaled, alphaMod); /* copy blending options to surface_scaled */
SDL_SetSurfaceBlendMode(surface_scaled, blendMode);
SDL_SetSurfaceColorMod(surface_scaled, r, g, b);
}
retval = SDL_BlitScaled(blit_src, srcrect, surface_scaled, &tmp_rect);
if (blit_src != src) {
SDL_FreeSurface(blit_src);
}
}
if (!retval) {
SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, angle, &dstwidth, &dstheight, &cangle, &sangle);
surface_rotated = SDLgfx_rotateSurface(surface_scaled, angle, dstwidth/2, dstheight/2, GetScaleQuality(), flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
if(surface_rotated) {
/* 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;
retval = SDL_BlitSurface(surface_rotated, NULL, surface, &tmp_rect);
SDL_FreeSurface(surface_rotated);
}
}
if (surface_scaled != src) {
SDL_FreeSurface(surface_scaled);
}
return retval;
}
static int
SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_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;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = (int)(renderer->viewport.x + dstrect->x);
final_rect.y = (int)(renderer->viewport.y + dstrect->y);
} else {
final_rect.x = (int)dstrect->x;
final_rect.y = (int)dstrect->y;
}
final_rect.w = (int)dstrect->w;
final_rect.h = (int)dstrect->h;
tmp_rect = final_rect;
tmp_rect.x = 0;
tmp_rect.y = 0;
/* 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;
}
/* The color and alpha modulation has to be applied before the rotation when using the NONE and MOD blend modes. */
if ((blendmode == SDL_BLENDMODE_NONE || blendmode == SDL_BLENDMODE_MOD) && (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, GetScaleQuality(), 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;
}
static int
SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertices, size_t vertsize)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = SW_ActivateRenderer(renderer);
const SDL_Rect *viewport = NULL;
const SDL_Rect *cliprect = NULL;
if (!surface) {
return -1;
}
while (cmd) {
switch (cmd->command) {
case SDL_RENDERCMD_SETDRAWCOLOR: {
break; /* Not used in this backend. */
}
case SDL_RENDERCMD_SETVIEWPORT: {
viewport = &cmd->data.viewport.rect;
SDL_SetClipRect(data->surface, viewport);
break;
}
case SDL_RENDERCMD_SETCLIPRECT: {
SDL_assert(viewport != NULL);
cliprect = cmd->data.cliprect.enabled ? &cmd->data.cliprect.rect : NULL;
if (cliprect) {
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, viewport);
}
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;
const SDL_Rect clip_rect = surface->clip_rect;
/* By definition the clear ignores the clip rect */
SDL_SetClipRect(surface, NULL);
SDL_FillRect(surface, NULL, SDL_MapRGBA(surface->format, r, g, b, a));
SDL_SetClipRect(surface, &clip_rect);
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;
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;
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;
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;
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);
PrepTextureForCopy(cmd);
SW_RenderCopyEx(renderer, surface, cmd->data.draw.texture, ©data->srcrect,
©data->dstrect, copydata->angle, ©data->center, copydata->flip);
break;
}
case SDL_RENDERCMD_NO_OP:
break;
}
cmd = cmd->next;
}
return 0;
}
