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GUI GetPixel
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@joncampbell123
joncampbell123 committed Jan 2, 2025
1 parent 5d417c8 commit 6c5da7b
Showing 1 changed file with 85 additions and 8 deletions.
93 changes: 85 additions & 8 deletions src/gui/sdl_gui.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -241,6 +241,7 @@ namespace WLGUI {
typedef size_t HandleIndex;
typedef uint32_t DevicePixel;/*pixel value, in target device format i.e. 16bpp rrrrrggggggbbbbb*/

static constexpr uint32_t Mask24 = uint32_t(0xFFFFFFu);
static constexpr Handle InvalidHandleValue = ~Handle(0u);
static constexpr HandleIndex InvalidHandleIndex = ~HandleIndex(0u);

Expand Down Expand Up @@ -361,6 +362,7 @@ namespace WLGUI {
ReferenceCountTracking ref;
Flags Flags;

DevicePixel (*GetPixel)(Obj &obj,long x,long y) = &GetPixel_stub;
void (*SetPixel)(Obj &obj,long x,long y,const DevicePixel c) = &SetPixel_stub;

Obj();
Expand All @@ -376,6 +378,8 @@ namespace WLGUI {
bool SetDeviceExtents(const long w,const long h,Point *po=NULL);
bool SetArbitraryMapMode(const bool m=false);
virtual void ConvertLogicalToDeviceCoordinates(long &x,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);
};

Expand All @@ -392,10 +396,16 @@ namespace WLGUI {

void initFromSurface(void);
void *GetSurfaceRowPtr(long x,long y);

static void SetPixel_32bpp(Obj &bobj,long x,long y,const DevicePixel c);
static void SetPixel_24bpp(Obj &bobj,long x,long y,const DevicePixel c);
static void SetPixel_16bpp(Obj &bobj,long x,long y,const DevicePixel c);
static void SetPixel_8bpp(Obj &bobj,long x,long y,const DevicePixel c);

static DevicePixel GetPixel_32bpp(Obj &bobj,long x,long y);
static DevicePixel GetPixel_24bpp(Obj &bobj,long x,long y);
static DevicePixel GetPixel_16bpp(Obj &bobj,long x,long y);
static DevicePixel GetPixel_8bpp(Obj &bobj,long x,long y);
};

Handle CreateSDLSurfaceDC(SDL_Surface *surf);
Expand Down Expand Up @@ -618,6 +628,13 @@ namespace WLGUI {
y += originDst.y;
}

DevicePixel Obj::GetPixel_stub(Obj &obj,long x,long y) {
(void)obj;
(void)x;
(void)y;
return DevicePixel(0);
}

void Obj::SetPixel_stub(Obj &obj,long x,long y,const DevicePixel c) {
(void)obj;
(void)x;
Expand Down Expand Up @@ -664,14 +681,22 @@ namespace WLGUI {
BackgroundColor = ColorDescription.t.RGB.Make8(0xFF,0xFF,0xFF);
ForegroundColor = ColorDescription.t.RGB.Make8(0x00,0x00,0x00);

if (ColorDescription.BytesPerPixel == 4)
if (ColorDescription.BytesPerPixel == 4) {
GetPixel = GetPixel_32bpp;
SetPixel = SetPixel_32bpp;
else if (ColorDescription.BytesPerPixel == 3)
}
else if (ColorDescription.BytesPerPixel == 3) {
GetPixel = GetPixel_24bpp;
SetPixel = SetPixel_24bpp;
else if (ColorDescription.BytesPerPixel == 2)
}
else if (ColorDescription.BytesPerPixel == 2) {
GetPixel = GetPixel_16bpp;
SetPixel = SetPixel_16bpp;
else if (ColorDescription.BytesPerPixel == 1)
}
else if (ColorDescription.BytesPerPixel == 1) {
GetPixel = GetPixel_8bpp;
SetPixel = SetPixel_8bpp;
}
}

void ObjSDLSurface::ConvertLogicalToDeviceCoordinates(long &x,long &y) {
Expand Down Expand Up @@ -700,13 +725,24 @@ namespace WLGUI {
if (row != NULL) *row = uint32_t(c);
}

DevicePixel ObjSDLSurface::GetPixel_32bpp(Obj &bobj,long x,long y) {
ObjSDLSurface &obj = reinterpret_cast<ObjSDLSurface&>(bobj);
uint32_t *row = (uint32_t*)obj.GetSurfaceRowPtr(x,y);
if (row != NULL) return DevicePixel(*row);
return DevicePixel(0);
}

void ObjSDLSurface::SetPixel_24bpp(Obj &bobj,long x,long y,const DevicePixel c) {
ObjSDLSurface &obj = reinterpret_cast<ObjSDLSurface&>(bobj);
uint8_t *row = (uint8_t*)obj.GetSurfaceRowPtr(x,y);
if (row != NULL) { /* this is why 24bpp isn't well supported past the late 1990s, it's awkward to draw sometimes */
host_writew(row,uint16_t(c));
host_writeb(row+2,uint8_t(c >> DevicePixel(16)));
}
if (row != NULL) *row = (uint32_t(c) & Mask24) + ((*row) & (~Mask24));
}

DevicePixel ObjSDLSurface::GetPixel_24bpp(Obj &bobj,long x,long y) {
ObjSDLSurface &obj = reinterpret_cast<ObjSDLSurface&>(bobj);
uint32_t *row = (uint32_t*)obj.GetSurfaceRowPtr(x,y);
if (row != NULL) return DevicePixel(*row & Mask24);
return DevicePixel(0);
}

void ObjSDLSurface::SetPixel_16bpp(Obj &bobj,long x,long y,const DevicePixel c) {
Expand All @@ -715,12 +751,26 @@ namespace WLGUI {
if (row != NULL) *row = uint16_t(c);
}

DevicePixel ObjSDLSurface::GetPixel_16bpp(Obj &bobj,long x,long y) {
ObjSDLSurface &obj = reinterpret_cast<ObjSDLSurface&>(bobj);
uint16_t *row = (uint16_t*)obj.GetSurfaceRowPtr(x,y);
if (row != NULL) return DevicePixel(*row);
return DevicePixel(0);
}

void ObjSDLSurface::SetPixel_8bpp(Obj &bobj,long x,long y,const DevicePixel c) {
ObjSDLSurface &obj = reinterpret_cast<ObjSDLSurface&>(bobj);
uint8_t *row = (uint8_t*)obj.GetSurfaceRowPtr(x,y);
if (row != NULL) *row = uint8_t(c);
}

DevicePixel ObjSDLSurface::GetPixel_8bpp(Obj &bobj,long x,long y) {
ObjSDLSurface &obj = reinterpret_cast<ObjSDLSurface&>(bobj);
uint8_t *row = (uint8_t*)obj.GetSurfaceRowPtr(x,y);
if (row != NULL) return DevicePixel(*row);
return DevicePixel(0);
}

Handle CreateSDLSurfaceDC(SDL_Surface *surf) {
const size_t idx = List.AllocateHandleIndex();
if (idx != InvalidHandleIndex) {
Expand All @@ -743,6 +793,15 @@ namespace WLGUI {
return DevicePixel(0);
}

DevicePixel GetPixel(const Handle h,long x,long y) {
Obj* obj = GetObject(h);
if (obj) {
obj->ConvertLogicalToDeviceCoordinates(x,y);
return obj->GetPixel(*obj,x,y); /* NTS: call through function pointer */
}
return DevicePixel(0);
}

void SetPixel(const Handle h,long x,long y,const DevicePixel c) {
Obj* obj = GetObject(h);
if (obj) {
Expand Down Expand Up @@ -927,6 +986,24 @@ void NewUIExperiment(bool pressed) {
WLGUI::DC::SetPixel(gui_surface_dc,x+200,x,WLGUI::DC::MakeRGB8(gui_surface_dc,0, cx,0 ));
WLGUI::DC::SetPixel(gui_surface_dc,x+300,x,WLGUI::DC::MakeRGB8(gui_surface_dc,0, 0, cx));
}
WLGUI::DC::SetArbitraryMapMode(gui_surface_dc,false);
WLGUI::DC::SetLogicalOrigin(gui_surface_dc,0,0);
WLGUI::DC::SetDeviceOrigin(gui_surface_dc,0,0);

SDL_UpdateRect(gui_surface, 0, 0, 0, 0);
while (SDL_PollEvent(&event));
SDL_Delay(1000);

{
const unsigned int sw = dw/4,sh = dh/4;
const unsigned int sx = dw - sw,sy = dh - sh;
for (unsigned int y=0;y < sx;y++) {
for (unsigned int x=0;x < sy;x++) {
WLGUI::DC::SetPixel(gui_surface_dc,x,y,
WLGUI::DC::GetPixel(gui_surface_dc,sx+(x/4),sy+(y/4)));
}
}
}

SDL_UpdateRect(gui_surface, 0, 0, 0, 0);
while (SDL_PollEvent(&event));
Expand Down

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