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Implement Renderer::FillCopy()

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This commit is contained in:
Dmitry Marakasov 2015-03-12 17:44:08 +03:00
parent be69a4ede6
commit ae590b5212
2 changed files with 103 additions and 0 deletions
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80
SDL2pp/Renderer.cc
View File

@ -114,6 +114,86 @@ Renderer& Renderer::Copy(Texture& texture, const Optional<Rect>& srcrect, const
return Copy(texture, srcrect, dstrect, angle, center, flip);
}
Renderer& Renderer::FillCopy(Texture& texture, const Optional<Rect>& srcrect, const Optional<Rect>& dstrect, const Point& offset, int flip) {
// resolve rectangles
Rect src = srcrect ? *srcrect : Rect(0, 0, texture.GetWidth(), texture.GetHeight());
Rect dst = dstrect ? *dstrect : Rect(0, 0, GetOutputWidth(), GetOutputHeight());
// rectangle for single tile
Rect start_tile(
offset.x,
offset.y,
src.w,
src.h
);
// ensure tile is leftmost and topmost
if (start_tile.x + start_tile.w <= 0)
start_tile.x += (-start_tile.x) / start_tile.w * start_tile.w;
if (start_tile.x > 0)
start_tile.x -= (start_tile.x + start_tile.w - 1) / start_tile.w * start_tile.w;
if (start_tile.y + start_tile.h <= 0)
start_tile.y += (-start_tile.y) / start_tile.h * start_tile.h;
if (start_tile.y > 0)
start_tile.y -= (start_tile.y + start_tile.h - 1) / start_tile.h * start_tile.h;
// paint tile array
for (int y = start_tile.y; y < dst.h; y += start_tile.h) {
for (int x = start_tile.x; x < dst.w; x += start_tile.w) {
Rect tile_src = src;
Rect tile_dst(x, y, start_tile.w, start_tile.h);
// clamp with dstrect
int xunderflow = -x;
if (xunderflow > 0) {
tile_src.w -= xunderflow;
tile_src.x += xunderflow;
tile_dst.w -= xunderflow;
tile_dst.x += xunderflow;
}
int yunderflow = -y;
if (yunderflow > 0) {
tile_src.h -= yunderflow;
tile_src.y += yunderflow;
tile_dst.h -= yunderflow;
tile_dst.y += yunderflow;
}
int xoverflow = tile_dst.x + tile_dst.w - dst.w;
if (xoverflow > 0) {
tile_src.w -= xoverflow;
tile_dst.w -= xoverflow;
}
int yoverflow = tile_dst.y + tile_dst.h - dst.h;
if (yoverflow > 0) {
tile_src.h -= yoverflow;
tile_dst.h -= yoverflow;
}
// make tile_dst absolute
tile_dst.x += dst.x;
tile_dst.y += dst.y;
if (flip != 0) {
// mirror tile_src inside src to take flipping into account
if (flip & SDL_FLIP_HORIZONTAL)
tile_src.x = src.w - tile_src.x - tile_src.w;
if (flip & SDL_FLIP_VERTICAL)
tile_src.y = src.h - tile_src.y - tile_src.h;
Copy(texture, tile_src, tile_dst, 0.0, NullOpt, flip);
} else {
Copy(texture, tile_src, tile_dst);
}
}
}
return *this;
}
Renderer& Renderer::SetDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a) {
if (SDL_SetRenderDrawColor(renderer_, r, g, b, a) != 0)
throw Exception("SDL_SetRenderDrawColor");

23
SDL2pp/Renderer.hh
View File

@ -275,6 +275,29 @@ public:
////////////////////////////////////////////////////////////
Renderer& Copy(Texture& texture, const Optional<Rect>& srcrect, const SDL2pp::Point& dstpoint, double angle, const Optional<Point>& center = NullOpt, int flip = 0);
////////////////////////////////////////////////////////////
/// \brief Fill the target with repeated source texture
///
/// \param[in] texture Source texture
/// \param[in] srcrect Source rectangle, NullOpt for the entire texture
/// \param[in] dstrect Destination rectangle, NullOpt for the entire
/// rendering target
/// \param[in] offset Offset of tiled texture in pixels relative to
/// dstrect
/// \param[in] flip SDL_RendererFlip value stating which flipping
/// actions should be performed on the texture
///
/// \returns Reference to self
///
/// \throws SDL2pp::Exception
///
/// \see http://wiki.libsdl.org/SDL_RendererFlip
/// \see http://wiki.libsdl.org/SDL_RenderCopy
/// \see http://wiki.libsdl.org/SDL_RenderCopyEx
///
////////////////////////////////////////////////////////////
Renderer& FillCopy(Texture& texture, const Optional<Rect>& srcrect = NullOpt, const Optional<Rect>& dstrect = NullOpt, const Point& offset = Point(0, 0), int flip = 0);
////////////////////////////////////////////////////////////
/// \brief Set color user for drawing operations
///