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(svn r16984) -Codechange: Document and assertify (Start|End)SpriteCombine.

This commit is contained in:
frosch 2009-07-29 20:27:24 +00:00
parent 3a6c0a9f22
commit d51c4b6f6e
1 changed files with 39 additions and 6 deletions
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45
src/viewport.cpp
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@ -106,6 +106,15 @@ enum FoundationPart {
FOUNDATION_PART_END
};
/** Mode of "sprite combining"
* @see StartSpriteCombine
*/
enum SpriteCombineMode {
SPRITE_COMBINE_NONE, ///< Every #AddSortableSpriteToDraw start its own bounding box
SPRITE_COMBINE_PENDING, ///< %Sprite combining will start with the next unclipped sprite.
SPRITE_COMBINE_ACTIVE, ///< %Sprite combining is active. #AddSortableSpriteToDraw outputs child sprites.
};
typedef SmallVector<TileSpriteToDraw, 64> TileSpriteToDrawVector;
typedef SmallVector<StringSpriteToDraw, 4> StringSpriteToDrawVector;
typedef SmallVector<ParentSpriteToDraw, 64> ParentSpriteToDrawVector;
@ -124,7 +133,7 @@ struct ViewportDrawer {
int *last_child;
byte combine_sprites;
SpriteCombineMode combine_sprites; ///< Current mode of "sprite combining". @see StartSpriteCombine
int foundation[FOUNDATION_PART_END]; ///< Foundation sprites (index into parent_sprites_to_draw).
FoundationPart foundation_part; ///< Currently active foundation for ground sprite drawing.
@ -619,7 +628,7 @@ void AddSortableSpriteToDraw(SpriteID image, SpriteID pal, int x, int y, int w,
pal = PALETTE_TO_TRANSPARENT;
}
if (_vd.combine_sprites == 2) {
if (_vd.combine_sprites == SPRITE_COMBINE_ACTIVE) {
AddCombinedSprite(image, pal, x, y, z, sub);
return;
}
@ -683,17 +692,41 @@ void AddSortableSpriteToDraw(SpriteID image, SpriteID pal, int x, int y, int w,
_vd.last_child = &ps->first_child;
if (_vd.combine_sprites == 1) _vd.combine_sprites = 2;
if (_vd.combine_sprites == SPRITE_COMBINE_PENDING) _vd.combine_sprites = SPRITE_COMBINE_ACTIVE;
}
/**
* Starts a block of sprites, which are "combined" into a single bounding box.
*
* Subsequent calls to #AddSortableSpriteToDraw will be drawn into the same bounding box.
* That is: The first sprite that is not clipped by the viewport defines the bounding box, and
* the following sprites will be child sprites to that one.
*
* That implies:
* - The drawing order is definite. No other sprites will be sorted between those of the block.
* - You have to provide a valid bounding box for all sprites,
* as you won't know which one is the first non-clipped one.
* Preferable you use the same bounding box for all.
* - You cannot use #AddChildSpriteScreen inside the block, as its result will be indefinite.
*
* The block is terminated by #EndSpriteCombine.
*
* You cannot nest "combined" blocks.
*/
void StartSpriteCombine()
{
_vd.combine_sprites = 1;
assert(_vd.combine_sprites == SPRITE_COMBINE_NONE);
_vd.combine_sprites = SPRITE_COMBINE_PENDING;
}
/**
* Terminates a block of sprites started by #StartSpriteCombine.
* Take a look there for details.
*/
void EndSpriteCombine()
{
_vd.combine_sprites = 0;
assert(_vd.combine_sprites != SPRITE_COMBINE_NONE);
_vd.combine_sprites = SPRITE_COMBINE_NONE;
}
/**
@ -1451,7 +1484,7 @@ void ViewportDoDraw(const ViewPort *vp, int left, int top, int right, int bottom
_vd.dpi.zoom = vp->zoom;
int mask = ScaleByZoom(-1, vp->zoom);
_vd.combine_sprites = 0;
_vd.combine_sprites = SPRITE_COMBINE_NONE;
_vd.dpi.width = (right - left) & mask;
_vd.dpi.height = (bottom - top) & mask;