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Fixed bug #3070 - SDL_RenderCopyEx rotation and global scaling around the wrong way (software renderer)

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Sylvain 2022-02-15 11:33:56 +01:00
parent e366ad1288
commit 18b76fcc5d
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GPG key ID: 5F87E02E5BC0939E
3 changed files with 39 additions and 19 deletions
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42
src/render/software/SDL_render_sw.c
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@ -273,12 +273,14 @@ typedef struct CopyExData
double angle;
SDL_FPoint center;
SDL_RendererFlip flip;
float scale_x;
float scale_y;
} CopyExData;
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)
const double angle, const SDL_FPoint *center, const SDL_RendererFlip flip, float scale_x, float scale_y)
{
CopyExData *verts = (CopyExData *) SDL_AllocateRenderVertices(renderer, sizeof (CopyExData), 0, &cmd->data.draw.first);
@ -297,14 +299,35 @@ SW_QueueCopyEx(SDL_Renderer * renderer, SDL_RenderCommand *cmd, SDL_Texture * te
verts->angle = angle;
SDL_memcpy(&verts->center, center, sizeof (SDL_FPoint));
verts->flip = flip;
verts->scale_x = scale_x;
verts->scale_y = scale_y;
return 0;
}
static int
Blit_to_Screen(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *surface, SDL_Rect *dstrect,
float scale_x, float scale_y, SDL_ScaleMode scaleMode)
{
int retval;
/* Renderer scaling, if needed */
if (scale_x != 1.0f || scale_y != 1.0f) {
SDL_Rect r;
r.x = (int)((float) dstrect->x * scale_x);
r.y = (int)((float) dstrect->y * scale_y);
r.w = (int)((float) dstrect->w * scale_x);
r.h = (int)((float) dstrect->h * scale_y);
retval = SDL_PrivateUpperBlitScaled(src, srcrect, surface, &r, scaleMode);
} else {
retval = SDL_BlitSurface(src, srcrect, surface, dstrect);
}
return retval;
}
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)
const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip, float scale_x, float scale_y)
{
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect tmp_rect;
@ -475,7 +498,8 @@ SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Surface *surface, SDL_Texture * tex
SDL_SetSurfaceAlphaMod(src_rotated, alphaMod);
SDL_SetSurfaceColorMod(src_rotated, rMod, gMod, bMod);
}
retval = SDL_BlitSurface(src_rotated, NULL, surface, &tmp_rect);
/* Renderer scaling, if needed */
retval = Blit_to_Screen(src_rotated, NULL, surface, &tmp_rect, scale_x, scale_y, texture->scaleMode);
} 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.
@ -484,7 +508,8 @@ SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Surface *surface, SDL_Texture * tex
*/
SDL_Rect mask_rect = tmp_rect;
SDL_SetSurfaceBlendMode(mask_rotated, SDL_BLENDMODE_NONE);
retval = SDL_BlitSurface(mask_rotated, NULL, surface, &mask_rect);
/* Renderer scaling, if needed */
retval = Blit_to_Screen(mask_rotated, NULL, surface, &mask_rect, scale_x, scale_y, texture->scaleMode);
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
@ -492,7 +517,8 @@ SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Surface *surface, SDL_Texture * tex
*/
SDL_SetSurfaceColorMod(src_rotated, 0, 0, 0);
mask_rect = tmp_rect;
retval = SDL_BlitSurface(src_rotated, NULL, surface, &mask_rect);
/* Renderer scaling, if needed */
retval = Blit_to_Screen(src_rotated, NULL, surface, &mask_rect, scale_x, scale_y, texture->scaleMode);
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
@ -508,7 +534,8 @@ SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Surface *surface, SDL_Texture * tex
retval = -1;
} else {
SDL_SetSurfaceBlendMode(src_rotated_rgb, SDL_BLENDMODE_ADD);
retval = SDL_BlitSurface(src_rotated_rgb, NULL, surface, &tmp_rect);
/* Renderer scaling, if needed */
retval = Blit_to_Screen(src_rotated_rgb, NULL, surface, &tmp_rect, scale_x, scale_y, texture->scaleMode);
SDL_FreeSurface(src_rotated_rgb);
}
}
@ -879,7 +906,8 @@ SW_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *vertic
}
SW_RenderCopyEx(renderer, surface, cmd->data.draw.texture, &copydata->srcrect,
&copydata->dstrect, copydata->angle, &copydata->center, copydata->flip);
&copydata->dstrect, copydata->angle, &copydata->center, copydata->flip,
copydata->scale_x, copydata->scale_y);
break;
}