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Mac: Implemented SDL_GetDisplayDPI (thanks, Kirill!). 

Fixes Bugzilla #3223.
This commit is contained in:
Ryan C. Gordon 2016-01-07 14:02:37 -05:00
parent 1d1ba58f28
commit 416d046663
4 changed files with 27 additions and 0 deletions
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1
src/video/cocoa/SDL_cocoamodes.h
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@ -37,6 +37,7 @@ extern void Cocoa_InitModes(_THIS);
extern int Cocoa_GetDisplayBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
extern int Cocoa_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
extern void Cocoa_GetDisplayModes(_THIS, SDL_VideoDisplay * display);
extern int Cocoa_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hpdi, float * vdpi);
extern int Cocoa_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
extern void Cocoa_QuitModes(_THIS);

18
src/video/cocoa/SDL_cocoamodes.m
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@ -374,6 +374,24 @@ Cocoa_GetDisplayUsableBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
return 0;
}
int
Cocoa_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi)
{
const float MM_IN_INCH = 25.4f;
SDL_DisplayData *data = (SDL_DisplayData *) display->driverdata;
CGSize displaySize = CGDisplayScreenSize(data->display);
size_t pixelWidth = CGDisplayPixelsWide(data->display);
size_t pixelHeight = CGDisplayPixelsHigh(data->display);
*ddpi = SDL_ComputeDiagonalDPI(pixelWidth, pixelHeight, displaySize.width / MM_IN_INCH, displaySize.height / MM_IN_INCH);
*hdpi = pixelWidth * MM_IN_INCH / displaySize.width;
*vdpi = pixelHeight * MM_IN_INCH / displaySize.height;
return 0;
}
void
Cocoa_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
{

1
src/video/cocoa/SDL_cocoavideo.m
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@ -74,6 +74,7 @@ Cocoa_CreateDevice(int devindex)
device->VideoQuit = Cocoa_VideoQuit;
device->GetDisplayBounds = Cocoa_GetDisplayBounds;
device->GetDisplayUsableBounds = Cocoa_GetDisplayUsableBounds;
device->GetDisplayDPI = Cocoa_GetDisplayDPI;
device->GetDisplayModes = Cocoa_GetDisplayModes;
device->SetDisplayMode = Cocoa_SetDisplayMode;
device->PumpEvents = Cocoa_PumpEvents;

7
test/testdisplayinfo.c
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@ -51,11 +51,18 @@ main(int argc, char *argv[])
for (dpy = 0; dpy < num_displays; dpy++) {
const int num_modes = SDL_GetNumDisplayModes(dpy);
SDL_Rect rect = { 0, 0, 0, 0 };
float ddpi, hdpi, vdpi;
int m;
SDL_GetDisplayBounds(dpy, &rect);
SDL_Log("%d: \"%s\" (%dx%d, (%d, %d)), %d modes.\n", dpy, SDL_GetDisplayName(dpy), rect.w, rect.h, rect.x, rect.y, num_modes);
if (SDL_GetDisplayDPI(dpy, &ddpi, &hdpi, &vdpi) == -1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DPI: failed to query (%s)\n", SDL_GetError());
} else {
SDL_Log(" DPI: ddpi=%f; hdpi=%f; vdpi=%f\n", ddpi, hdpi, vdpi);
}
if (SDL_GetCurrentDisplayMode(dpy, &mode) == -1) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " CURRENT: failed to query (%s)\n", SDL_GetError());
} else {