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Bitmap font scaling

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This commit is contained in:
Jonathan Campbell
2025-01-05 09:12:59 -08:00
parent 58aeb33ddc
commit 77691f728e
1 changed files with 72 additions and 7 deletions
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79
src/gui/sdl_gui.cpp
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@@ -363,7 +363,9 @@ namespace WLGUI {
/* VGA font */
struct ObjVGAFont : public Obj {
const unsigned char* font = (const unsigned char*)NULL;
unsigned char* copy = NULL; /* if you ask for larger sizes */
uint16_t fontheight = 0;
uint16_t scale = 1;
ObjVGAFont(const unsigned int height);
virtual ~ObjVGAFont();
@@ -373,6 +375,11 @@ namespace WLGUI {
virtual bool GetChar(unsigned int glyph,Bitmap &bmp,unsigned int flags) override;
};
Handle CreateVGAFont(const unsigned int height);
int GetHeight(const Handle h);
int GetAscent(const Handle h);
bool Destroy(Handle h);
}
namespace DC {
@@ -612,6 +619,8 @@ namespace WLGUI {
/////////////////
ObjVGAFont::ObjVGAFont(const unsigned int height) : Obj(ObjType::VGAFont) {
scale = 1; while ((height/scale) >= 24) scale++;
Flags.v |= Flags::FixedPitch;
if (height >= 16) {
font = int10_font_16;
@@ -625,9 +634,47 @@ namespace WLGUI {
font = int10_font_08;
fontheight = 8;
}
if (scale > 1) {
copy = new unsigned char[fontheight*256*scale*scale]; /* expand in both dimensions */
memset(copy,0,fontheight*256*scale*scale);
for (unsigned int y=0;y < (fontheight*256);y++) {
unsigned char *d = copy + (y*scale*scale),*ld = d;
const unsigned char *s = font + y;
memset(d,0,scale);
d += scale;
unsigned char smsk = 0x80,dmsk = 0x80;
for (unsigned int x=0;x < 8;x++) {
for (unsigned int c=0;c < scale;c++) {
if (*s & smsk) *ld |= dmsk;
if ((dmsk >>= 1u) == 0) {
dmsk = 0x80;
ld++;
}
}
smsk >>= 1u;
}
for (unsigned int c=1;c < scale;c++) {
memcpy(d,d-scale,scale);
d += scale;
}
}
fontheight *= scale;
font = copy;
}
totalHeight = fontheight;
ascentY = fontheight - (2 * scale);
}
ObjVGAFont::~ObjVGAFont() {
if (copy) delete[] copy;
}
signed int ObjVGAFont::GlyphLookup(int32_t uc) {
@@ -642,16 +689,16 @@ namespace WLGUI {
if (glyph < 256) {
bmp = Bitmap();
bmp.bpp = 1;
bmp.pitch = 1;
bmp.pitch = 1 * scale;
bmp.height = fontheight;
bmp.base = font + (glyph * fontheight);
bmp.base = font + (glyph * fontheight * bmp.pitch);
bmp.sx = 0;
bmp.sy = 0;
bmp.dw = 8;
bmp.dw = 8 * scale;
bmp.dh = fontheight;
bmp.dx = 0;
bmp.dy = 0;
bmp.advancex256 = 8u << 8u;
bmp.advancex256 = (8u * scale) << 8u;
bmp.cw = 8;
(void)flags;
return true;
@@ -662,6 +709,12 @@ namespace WLGUI {
//////////////////
/* for internal use only */
Obj* GetObject(const Handle h) {
const HandleIndex idx = GetHandleIndex(HandleType::FontHandle,h);
return (Obj*)Resources.Get(idx);
}
Handle CreateVGAFont(const unsigned int height) {
const size_t idx = Resources.AllocateHandleIndex();
if (idx != InvalidHandleIndex) {
@@ -672,6 +725,18 @@ namespace WLGUI {
return InvalidHandleValue;
}
int GetHeight(const Handle h) {
Obj* obj = GetObject(h);
if (obj) { return obj->totalHeight; }
return 0;
}
int GetAscent(const Handle h) {
Obj* obj = GetObject(h);
if (obj) { return obj->ascentY; }
return 0;
}
bool Destroy(Handle h) {
const HandleIndex idx = GetHandleIndex(HandleType::FontHandle,h);
if (idx != InvalidHandleIndex) return Resources.Delete(idx);
@@ -1055,15 +1120,15 @@ 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::Handle VGAFont = WLGUI::FontHandle::CreateVGAFont(16);
WLGUI::Handle VGAFont = WLGUI::FontHandle::CreateVGAFont(16*2);
if (VGAFont == WLGUI::InvalidHandleValue) E_Exit("Cannot create VGA font");
WLGUI::DC::SelectFont(gui_surface_dc,VGAFont);
WLGUI::DC::SetForegroundColor(gui_surface_dc,WLGUI::DC::MakeRGB8(gui_surface_dc,0xFF,0xFF,0xFF));
WLGUI::DC::SetBackgroundColor(gui_surface_dc,WLGUI::DC::MakeRGB8(gui_surface_dc,0x00,0x00,0xFF));
WLGUI::DC::TextOut(gui_surface_dc,0,0,"Hello!");
WLGUI::DC::TextOut(gui_surface_dc,0,16,"Hello!");
WLGUI::DC::TextOut(gui_surface_dc,0,0,"Hello,");
WLGUI::DC::TextOut(gui_surface_dc,0,WLGUI::FontHandle::GetHeight(VGAFont),"World!");
for (long x=-100;x < 100;x++) {
WLGUI::DC::SetPixel(gui_surface_dc,x, x,WLGUI::DC::MakeRGB8(gui_surface_dc,x+128,x+128,x+128));