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Add SDL_GetDisplayDPI routine and implement for Windows.

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This commit is contained in:
Alfred Reynolds 2015-07-29 17:18:56 -07:00
parent f5cf86769a
commit 61c7415071
9 changed files with 173 additions and 7 deletions
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12
include/SDL_video.h
View file

@ -296,6 +296,18 @@ extern DECLSPEC const char * SDLCALL SDL_GetDisplayName(int displayIndex);
*/
extern DECLSPEC int SDLCALL SDL_GetDisplayBounds(int displayIndex, SDL_Rect * rect);
/**
* \brief Get the dots/pixels-per-inch for a display
*
* \note Diagonal, horizontal and vertical DPI can all be optionally
* returned if the parameter is non-NULL.
*
* \return 0 on success, or -1 if no DPI information is available or the index is out of range.
*
* \sa SDL_GetNumVideoDisplays()
*/
extern DECLSPEC int SDLCALL SDL_GetDisplayDPI(int displayIndex, float * ddpi, float * hdpi, float * vdpi);
/**
* \brief Returns the number of available display modes.
*

1
src/dynapi/SDL_dynapi_overrides.h
View file

@ -505,6 +505,7 @@
#define SDL_GetNumVideoDisplays SDL_GetNumVideoDisplays_REAL
#define SDL_GetDisplayName SDL_GetDisplayName_REAL
#define SDL_GetDisplayBounds SDL_GetDisplayBounds_REAL
#define SDL_GetDisplayDPI SDL_GetDisplayDPI_REAL
#define SDL_GetNumDisplayModes SDL_GetNumDisplayModes_REAL
#define SDL_GetDisplayMode SDL_GetDisplayMode_REAL
#define SDL_GetDesktopDisplayMode SDL_GetDesktopDisplayMode_REAL

1
src/dynapi/SDL_dynapi_procs.h
View file

@ -534,6 +534,7 @@ SDL_DYNAPI_PROC(const char*,SDL_GetCurrentVideoDriver,(void),(),return)
SDL_DYNAPI_PROC(int,SDL_GetNumVideoDisplays,(void),(),return)
SDL_DYNAPI_PROC(const char*,SDL_GetDisplayName,(int a),(a),return)
SDL_DYNAPI_PROC(int,SDL_GetDisplayBounds,(int a, SDL_Rect *b),(a,b),return)
SDL_DYNAPI_PROC(int,SDL_GetDisplayDPI,(int a, float *b, float *c, float *d),(a,b,c,d),return)
SDL_DYNAPI_PROC(int,SDL_GetNumDisplayModes,(int a),(a),return)
SDL_DYNAPI_PROC(int,SDL_GetDisplayMode,(int a, int b, SDL_DisplayMode *c),(a,b,c),return)
SDL_DYNAPI_PROC(int,SDL_GetDesktopDisplayMode,(int a, SDL_DisplayMode *b),(a,b),return)

7
src/video/SDL_sysvideo.h
View file

@ -170,6 +170,11 @@ struct SDL_VideoDevice
*/
int (*GetDisplayBounds) (_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
/*
* Get the dots/pixels-per-inch of a display
*/
int (*GetDisplayDPI) (_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi);
/*
* Get a list of the available display modes for a display.
*/
@ -423,6 +428,8 @@ extern SDL_Window * SDL_GetFocusWindow(void);
extern SDL_bool SDL_ShouldAllowTopmost(void);
extern float SDL_ComputeDiagonalDPI(int hpix, int vpix, float hinches, float vinches);
#endif /* _SDL_sysvideo_h */
/* vi: set ts=4 sw=4 expandtab: */

29
src/video/SDL_video.c
View file

@ -687,6 +687,24 @@ SDL_GetDisplayBounds(int displayIndex, SDL_Rect * rect)
return 0;
}
int
SDL_GetDisplayDPI(int displayIndex, float * ddpi, float * hdpi, float * vdpi)
{
SDL_VideoDisplay *display;
CHECK_DISPLAY_INDEX(displayIndex, -1);
display = &_this->displays[displayIndex];
if (_this->GetDisplayDPI) {
if (_this->GetDisplayDPI(_this, display, ddpi, hdpi, vdpi) == 0) {
return 0;
}
}
return -1;
}
SDL_bool
SDL_AddDisplayMode(SDL_VideoDisplay * display, const SDL_DisplayMode * mode)
{
@ -3538,4 +3556,15 @@ SDL_SetWindowHitTest(SDL_Window * window, SDL_HitTest callback, void *userdata)
return 0;
}
float SDL_ComputeDiagonalDPI(int hpix, int vpix, float hinches, float vinches)
{
float den2 = hinches * hinches + vinches * vinches;
if ( den2 <= 0.0f ) {
return 0.0f;
}
return (float)(SDL_sqrt((double)hpix * (double)hpix + (double)vpix * (double)vpix) /
SDL_sqrt((double)den2));
}
/* vi: set ts=4 sw=4 expandtab: */

100
src/video/windows/SDL_windowsmodes.c
View file

@ -29,9 +29,50 @@
#define CDS_FULLSCREEN 0
#endif
static SDL_bool
WIN_GetDisplayMode(LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
typedef struct _WIN_GetMonitorDPIData {
SDL_VideoData *vid_data;
SDL_DisplayMode *mode;
SDL_DisplayModeData *mode_data;
} WIN_GetMonitorDPIData;
static BOOL CALLBACK
WIN_GetMonitorDPI(HMONITOR hMonitor,
HDC hdcMonitor,
LPRECT lprcMonitor,
LPARAM dwData)
{
WIN_GetMonitorDPIData *data = (WIN_GetMonitorDPIData*) dwData;
UINT hdpi, vdpi;
if (data->vid_data->GetDpiForMonitor(hMonitor, MDT_EFFECTIVE_DPI, &hdpi, &vdpi) == S_OK &&
hdpi > 0 &&
vdpi > 0) {
float hsize, vsize;
data->mode_data->HorzDPI = (float)hdpi;
data->mode_data->VertDPI = (float)vdpi;
// Figure out the monitor size and compute the diagonal DPI.
hsize = data->mode->w / data->mode_data->HorzDPI;
vsize = data->mode->h / data->mode_data->VertDPI;
data->mode_data->DiagDPI = SDL_ComputeDiagonalDPI( data->mode->w,
data->mode->h,
hsize,
vsize );
// We can only handle one DPI per display mode so end the enumeration.
return FALSE;
}
// We didn't get DPI information so keep going.
return TRUE;
}
static SDL_bool
WIN_GetDisplayMode(_THIS, LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
{
SDL_VideoData *vid_data = (SDL_VideoData *) _this->driverdata;
SDL_DisplayModeData *data;
DEVMODE devmode;
HDC hdc;
@ -52,6 +93,9 @@ WIN_GetDisplayMode(LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
DM_DISPLAYFLAGS);
data->ScaleX = 1.0f;
data->ScaleY = 1.0f;
data->DiagDPI = 0.0f;
data->HorzDPI = 0.0f;
data->VertDPI = 0.0f;
/* Fill in the mode information */
mode->format = SDL_PIXELFORMAT_UNKNOWN;
@ -73,6 +117,30 @@ WIN_GetDisplayMode(LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
mode->w = logical_width;
mode->h = logical_height;
// WIN_GetMonitorDPI needs mode->w and mode->h
// so only call after those are set.
if (vid_data->GetDpiForMonitor) {
WIN_GetMonitorDPIData dpi_data;
dpi_data.vid_data = vid_data;
dpi_data.mode = mode;
dpi_data.mode_data = data;
EnumDisplayMonitors(hdc, NULL, WIN_GetMonitorDPI, (LPARAM)&dpi_data);
} else {
// We don't have the Windows 8.1 routine so just
// get system DPI.
data->HorzDPI = (float)GetDeviceCaps( hdc, LOGPIXELSX );
data->VertDPI = (float)GetDeviceCaps( hdc, LOGPIXELSY );
if (data->HorzDPI == data->VertDPI) {
data->DiagDPI = data->HorzDPI;
} else {
data->DiagDPI = SDL_ComputeDiagonalDPI( mode->w,
mode->h,
(float)GetDeviceCaps( hdc, HORZSIZE ) / 25.4f,
(float)GetDeviceCaps( hdc, VERTSIZE ) / 25.4f );
}
}
SDL_zero(bmi_data);
bmi = (LPBITMAPINFO) bmi_data;
bmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
@ -131,7 +199,7 @@ WIN_GetDisplayMode(LPCTSTR deviceName, DWORD index, SDL_DisplayMode * mode)
}
static SDL_bool
WIN_AddDisplay(LPTSTR DeviceName)
WIN_AddDisplay(_THIS, LPTSTR DeviceName)
{
SDL_VideoDisplay display;
SDL_DisplayData *displaydata;
@ -141,7 +209,7 @@ WIN_AddDisplay(LPTSTR DeviceName)
#ifdef DEBUG_MODES
printf("Display: %s\n", WIN_StringToUTF8(DeviceName));
#endif
if (!WIN_GetDisplayMode(DeviceName, ENUM_CURRENT_SETTINGS, &mode)) {
if (!WIN_GetDisplayMode(_this, DeviceName, ENUM_CURRENT_SETTINGS, &mode)) {
return SDL_FALSE;
}
@ -215,10 +283,10 @@ WIN_InitModes(_THIS)
continue;
}
}
count += WIN_AddDisplay(device.DeviceName);
count += WIN_AddDisplay(_this, device.DeviceName);
}
if (count == 0) {
WIN_AddDisplay(DeviceName);
WIN_AddDisplay(_this, DeviceName);
}
}
}
@ -241,6 +309,24 @@ WIN_GetDisplayBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect)
return 0;
}
int
WIN_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi)
{
SDL_DisplayModeData *data = (SDL_DisplayModeData *) display->current_mode.driverdata;
if (ddpi) {
*ddpi = data->DiagDPI;
}
if (hdpi) {
*hdpi = data->HorzDPI;
}
if (vdpi) {
*vdpi = data->VertDPI;
}
return data->DiagDPI != 0.0f ? 0 : -1;
}
void
WIN_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
{
@ -249,7 +335,7 @@ WIN_GetDisplayModes(_THIS, SDL_VideoDisplay * display)
SDL_DisplayMode mode;
for (i = 0;; ++i) {
if (!WIN_GetDisplayMode(data->DeviceName, i, &mode)) {
if (!WIN_GetDisplayMode(_this, data->DeviceName, i, &mode)) {
break;
}
if (SDL_ISPIXELFORMAT_INDEXED(mode.format)) {

4
src/video/windows/SDL_windowsmodes.h
View file

@ -33,10 +33,14 @@ typedef struct
DEVMODE DeviceMode;
float ScaleX;
float ScaleY;
float DiagDPI;
float HorzDPI;
float VertDPI;
} SDL_DisplayModeData;
extern int WIN_InitModes(_THIS);
extern int WIN_GetDisplayBounds(_THIS, SDL_VideoDisplay * display, SDL_Rect * rect);
extern int WIN_GetDisplayDPI(_THIS, SDL_VideoDisplay * display, float * ddpi, float * hdpi, float * vdpi);
extern void WIN_GetDisplayModes(_THIS, SDL_VideoDisplay * display);
extern int WIN_SetDisplayMode(_THIS, SDL_VideoDisplay * display, SDL_DisplayMode * mode);
extern void WIN_QuitModes(_THIS);

9
src/video/windows/SDL_windowsvideo.c
View file

@ -78,6 +78,9 @@ WIN_DeleteDevice(SDL_VideoDevice * device)
if (data->userDLL) {
SDL_UnloadObject(data->userDLL);
}
if (data->shcoreDLL) {
SDL_UnloadObject(data->shcoreDLL);
}
SDL_free(device->driverdata);
SDL_free(device);
@ -112,10 +115,16 @@ WIN_CreateDevice(int devindex)
data->RegisterTouchWindow = (BOOL (WINAPI *)(HWND, ULONG)) SDL_LoadFunction(data->userDLL, "RegisterTouchWindow");
}
data->shcoreDLL = SDL_LoadObject("SHCORE.DLL");
if (data->shcoreDLL) {
data->GetDpiForMonitor = (HRESULT (WINAPI *)(HMONITOR, MONITOR_DPI_TYPE, UINT *, UINT *)) SDL_LoadFunction(data->shcoreDLL, "GetDpiForMonitor");
}
/* Set the function pointers */
device->VideoInit = WIN_VideoInit;
device->VideoQuit = WIN_VideoQuit;
device->GetDisplayBounds = WIN_GetDisplayBounds;
device->GetDisplayDPI = WIN_GetDisplayDPI;
device->GetDisplayModes = WIN_GetDisplayModes;
device->SetDisplayMode = WIN_SetDisplayMode;
device->PumpEvents = WIN_PumpEvents;

17
src/video/windows/SDL_windowsvideo.h
View file

@ -76,6 +76,17 @@ typedef struct _TOUCHINPUT {
#endif /* WINVER < 0x0601 */
#if WINVER < 0x0603
typedef enum MONITOR_DPI_TYPE {
MDT_EFFECTIVE_DPI = 0,
MDT_ANGULAR_DPI = 1,
MDT_RAW_DPI = 2,
MDT_DEFAULT = MDT_EFFECTIVE_DPI
} MONITOR_DPI_TYPE;
#endif /* WINVER < 0x0603 */
typedef BOOL (*PFNSHFullScreen)(HWND, DWORD);
typedef void (*PFCoordTransform)(SDL_Window*, POINT*);
@ -124,6 +135,12 @@ typedef struct SDL_VideoData
BOOL (WINAPI *GetTouchInputInfo)( HTOUCHINPUT, UINT, PTOUCHINPUT, int );
BOOL (WINAPI *RegisterTouchWindow)( HWND, ULONG );
void* shcoreDLL;
HRESULT (WINAPI *GetDpiForMonitor)( HMONITOR hmonitor,
MONITOR_DPI_TYPE dpiType,
UINT *dpiX,
UINT *dpiY );
SDL_bool ime_com_initialized;
struct ITfThreadMgr *ime_threadmgr;
SDL_bool ime_initialized;