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clipping

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This commit is contained in:
Jonathan Campbell 2025-01-11 15:11:03 -08:00
parent 5aba71debd
commit c90ceefde1
1 changed files with 63 additions and 4 deletions
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67
src/gui/sdl_gui.cpp
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@ -286,6 +286,15 @@ namespace WLGUI {
Point(const long _x,const long _y) : x(_x), y(_y) { }
};
struct Rect {
long left,top,right,bottom;
Rect() { }
Rect(const long _l,const long _t,const long _r,const long _b) : left(_l), top(_t), right(_r), bottom(_b) { }
bool isInRect(const long x,const long y) const;
bool isEmpty(void) const;
};
struct ReferenceCountTracking {
int refcount = 0;
int AddRef(void);
@ -398,10 +407,12 @@ namespace WLGUI {
* Don't keep the DC open except to draw. */
struct Obj : public Resource {
struct Flags {
static constexpr uint32_t DC_CLIPRECT = uint32_t(1u) << uint32_t(0u);
uint32_t v = 0;
};
ObjType type; /* init by constructor */
Rect clip = {-1,-1,-1,-1};
Dimensions viewport = {0,0}; /* the viewport in device pixels i.e. SDL surface pixels */
Point originSrc = {0,0}; /* coordinate system origin */
Point originDst = {0,0}; /* coordinate system origin */
@ -426,7 +437,9 @@ namespace WLGUI {
virtual Handle SelectFont(Handle newValue);
virtual bool TextOut(long x,long y,const char *str/*TODO UTF-8*/);
virtual bool DrawTextChar1bpp(long x,long y,FontHandle::Bitmap &bmp);
virtual bool SetClipRegion(const Rect &r);
bool DrawTextChar(long x,long y,FontHandle::Bitmap &bmp);
virtual bool clipCheck(const long x,const long y);
static DevicePixel GetPixel_stub(Obj &obj,long x,long y);
static void SetPixel_stub(Obj &obj,long x,long y,const DevicePixel c);
@ -468,6 +481,7 @@ namespace WLGUI {
bool Delete(const Handle h);
Handle SelectFont(const Handle DC,const Handle newValue);
bool TextOut(const Handle h,long x,long y,const char *str/*TODO UTF-8*/);
bool SetClipRegion(const Handle h,const Rect &r);
}
@ -510,6 +524,14 @@ namespace WLGUI {
return 0;
}
bool Rect::isEmpty(void) const {
return left == -1l && left == right && right == top && top == bottom;
}
bool Rect::isInRect(const long x,const long y) const {
return (x >= left && x < right) && (y >= top && y < bottom);
}
Resource::Resource(const HandleType init_ht) : htype(init_ht) {
}
@ -801,20 +823,32 @@ namespace WLGUI {
return InvalidHandleValue;
}
bool Obj::SetClipRegion(const Rect &r) {
if (!r.isEmpty()) {
Flags.v |= Flags::DC_CLIPRECT;
clip = r;
}
else {
Flags.v &= ~Flags::DC_CLIPRECT;
}
return true;
}
/* NTS: Override this method if you have a faster more optimized routine for 1bpp bitmap font rendering */
bool Obj::DrawTextChar1bpp(long x,long y,FontHandle::Bitmap &bmp) {
long dx = x + bmp.dx;
for (unsigned int subx=0;subx < bmp.dw;subx++) {
const unsigned int bsx = bmp.sx + subx;
unsigned char msk = 0x80 >> (bsx & 7u);
long dy = y + bmp.dy;
const unsigned char *s =
bmp.base +
(bmp.sy * bmp.pitch) +
(bsx >> 3u);
long dy = y + bmp.dy;
for (unsigned int suby=0;suby < bmp.dh;suby++) {
if (*s & msk) SetPixel(*this,dx,dy,ForegroundColor);
if ((*s & msk) && clipCheck(dx,dy)) SetPixel(*this,dx,dy,ForegroundColor);
s += bmp.pitch;
dy++;
}
@ -825,6 +859,13 @@ namespace WLGUI {
return true;
}
bool Obj::clipCheck(const long x,const long y) {
if (Flags.v & Flags::DC_CLIPRECT)
return clip.isInRect(x,y);
return true;
}
bool Obj::DrawTextChar(long x,long y,FontHandle::Bitmap &bmp) {
if (bmp.base != NULL) {
if (bmp.bpp == 1)
@ -1022,7 +1063,7 @@ namespace WLGUI {
Obj* obj = GetObject(h);
if (obj) {
obj->ConvertLogicalToDeviceCoordinates(x,y);
return obj->GetPixel(*obj,x,y); /* NTS: call through function pointer */
if (obj->clipCheck(x,y)) return obj->GetPixel(*obj,x,y); /* NTS: call through function pointer */
}
return DevicePixel(0);
}
@ -1031,7 +1072,7 @@ namespace WLGUI {
Obj* obj = GetObject(h);
if (obj) {
obj->ConvertLogicalToDeviceCoordinates(x,y);
obj->SetPixel(*obj,x,y,c); /* NTS: call through function pointer */
if (obj->clipCheck(x,y)) obj->SetPixel(*obj,x,y,c); /* NTS: call through function pointer */
}
}
@ -1086,6 +1127,22 @@ namespace WLGUI {
return false;
}
bool SetClipRegion(const Handle h,const Rect &r) {
Obj* obj = GetObject(h);
if (obj) {
if (!r.isEmpty()) {
Rect cr = r;
obj->ConvertLogicalToDeviceCoordinates(cr.left,cr.top);
obj->ConvertLogicalToDeviceCoordinates(cr.right,cr.bottom);
return obj->SetClipRegion(cr);
}
else {
return obj->SetClipRegion(r);
}
}
return false;
}
}
}
@ -1121,6 +1178,8 @@ void NewUIExperiment(bool pressed) {
WLGUI::Handle gui_surface_dc = WLGUI::DC::CreateSDLSurfaceDC(gui_surface);
if (gui_surface_dc == WLGUI::InvalidHandleValue) E_Exit("Cannot create SDL DC");
WLGUI::DC::SetClipRegion(gui_surface_dc,WLGUI::Rect(dw/4,dh/4,(dw*3)/4,(dh*3)/4));
WLGUI::Handle VGAFont = WLGUI::FontHandle::CreateVGAFont(16*2);
if (VGAFont == WLGUI::InvalidHandleValue) E_Exit("Cannot create VGA font");