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used single Blend class in Bitmap<>

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This commit is contained in:
HuYingzhuo(hugo/hyzboy) 2023-07-11 19:36:48 +08:00
parent 713a9f98b3
commit c41cd9283d
2 changed files with 11 additions and 49 deletions
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41
inc/hgl/2d/Blend.h
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@ -6,52 +6,17 @@ namespace hgl
{ {
namespace bitmap namespace bitmap
{ {
enum class BlendMode
{
NoBlend, ///<不混合
Alpha, ///<Alpha混合
Add, ///<加法混合
Sub, ///<减法混合
};//enum class BlendMode
template<typename T> struct BlendColor template<typename T> struct BlendColor
{ {
BlendMode mode=BlendMode::NoBlend; virtual const T operator()(const T &src,const T &)const
public:
virtual const T &BlendNoBlend(const T &src,const T &dst,const float alpha)
{ {
return src; return src;
} }
virtual const T &BlendAlpha(const T &src,const T &dst,const float alpha) virtual const T operator()(const T &src,const T &,const float &)const
{ {
return src*alpha+dst*(1-alpha);
}
virtual const T &BlendAdd(const T &src,const T &dst,const float alpha)
{
return src*alpha+dst;
}
virtual const T &BlendSub(const T &src,const T &dst,const float alpha)
{
return src*alpha-dst;
}
virtual const T &Blend(const T &src,const T &dst,const float alpha)
{
switch(mode)
{
case BlendMode::NoBlend: return BlendNoBlend(src,dst,alpha);
case BlendMode::Alpha: return BlendAlpha(src,dst,alpha);
case BlendMode::Add: return BlendAdd(src,dst,alpha);
case BlendMode::Sub: return BlendSub(src,dst,alpha);
}
return src; return src;
} }
};//template<typename T> class BlendColor };//template<typename T> struct BlendColor
}//namespace bitmap }//namespace bitmap
}//namespace hgl }//namespace hgl

19
inc/hgl/2d/DrawGeometry.h
View File

@ -21,6 +21,7 @@ namespace hgl
T draw_color; T draw_color;
float alpha; float alpha;
BlendColor<T> no_blend;
BlendColor<T> *blend; BlendColor<T> *blend;
public: public:
@ -28,8 +29,9 @@ namespace hgl
DrawGeometry(FormatBitmap *fb) DrawGeometry(FormatBitmap *fb)
{ {
bitmap=fb; bitmap=fb;
draw_color=0; hgl_zero(draw_color);
alpha=1; alpha=1;
blend=&no_blend;
} }
virtual ~DrawGeometry()=default; virtual ~DrawGeometry()=default;
@ -44,14 +46,9 @@ namespace hgl
blend=bc; blend=bc;
} }
virtual void SetBlend(const BlendMode &mode)
{
blend->mode=mode;
}
void CloseBlend() void CloseBlend()
{ {
blend->mode=BlendMode.NoBlend; blend=&no_blend;
} }
void SetAlpha(const float &a) void SetAlpha(const float &a)
@ -80,7 +77,7 @@ namespace hgl
if(!p)return(false); if(!p)return(false);
*p=blend->Blend(draw_color,*p,alpha); *p=(*blend)(draw_color,*p,alpha);
return(true); return(true);
} }
@ -102,7 +99,7 @@ namespace hgl
T *p=bitmap->GetData(x,y); T *p=bitmap->GetData(x,y);
for(int i=0;i<length;i++) for(int i=0;i<length;i++)
*p++=blend->Blend(draw_color,*p,alpha); *p++=(*blend)(draw_color,*p,alpha);
return(true); return(true);
} }
@ -129,7 +126,7 @@ namespace hgl
for(int y=t;y<t+h;y++) for(int y=t;y<t+h;y++)
{ {
for(int i=0;i<length;i++) for(int i=0;i<length;i++)
*p++=blend->Blend(draw_color,*p,alpha); *p++=(*blend)Blend(draw_color,*p,alpha);
p+=width-w; p+=width-w;
} }
@ -156,7 +153,7 @@ namespace hgl
for(int i=0;i<length;i++) for(int i=0;i<length;i++)
{ {
*p=blend->Blend(draw_color,*p,alpha); *p=(*blend)Blend(draw_color,*p,alpha);
p+=line_bytes; p+=line_bytes;
} }