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Implemented high-DPI support #2

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Implemented high-DPI support #2

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30 changes: 29 additions & 1 deletion vga.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -120,6 +120,12 @@ namespace
} } xterm256init;
#undef Make16

// CobaltXII: These two variables retain the
// scaling factor for high-dpi monitors.

int xr_factor;
int yr_factor;

SDL_Window* window = nullptr;
SDL_Renderer* renderer = nullptr;
SDL_Texture* texture = nullptr;
Expand Down Expand Up @@ -154,7 +160,14 @@ namespace
window = SDL_CreateWindow("editor",
SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
pixels_width, pixels_height,
SDL_WINDOW_RESIZABLE);
SDL_WINDOW_RESIZABLE|

// HIGH DPI SUPPORT!
SDL_WINDOW_ALLOW_HIGHDPI);

// This is not really required but it may be of use for
// people with strange monitors. It prevents antialiasing.
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY,0);
}
else
{
Expand All @@ -178,6 +191,18 @@ namespace
textureheight = bufpixels_height);
}

// Get size of OpenGL drawable. This will be larger than the pixels_width and
// pixels_height defined by Bisqwit (on high dpi monitors, only!).
int gl_xr;
int gl_yr;
SDL_GL_GetDrawableSize(window,&gl_xr, &gl_yr);

// Find the Scaling factors. This is done by dividing the GL resolution by the
// resolution defined by Bisqwit. If no high-dpi, this will be 1. Otherwise it
// will probably be 2 or rarely 3.
xr_factor = gl_xr / pixels_width;
yr_factor = gl_yr / pixels_height;

pixbuf.resize(bufpixels_width*bufpixels_height);
cursor_old=~0u;
//fprintf(stderr, "resized\n");
Expand Down Expand Up @@ -207,6 +232,9 @@ namespace
trect.w = (rect.x + rect.w) * w / bufpixels_width - trect.x;
trect.h = (rect.y + rect.h) * h / bufpixels_height - trect.y;

trect.w *= xr_factor;
trect.h *= yr_factor;

if(SDL_UpdateTexture(texture, &rect,
pixbuf.data() + rect.y*bufpixels_width,
bufpixels_width*sizeof(pixbuf[0]))) ++errors;
Expand Down