mirror of https://github.com/axmolengine/axmol.git
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
#include "platform/CCDevice.h"
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#include "CCEGLView.h"
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#include "CCCommon.h"
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#include <screen/screen.h>
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#include <math.h>
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NS_CC_BEGIN
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int Device::getDPI()
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{
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static int dpi = -1;
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if (dpi == -1)
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{
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screen_display_t screen_disp = EGLView::sharedOpenGLView()->getScreenDisplay();
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#ifdef BLACKBERRY10
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// Dev Alpha: 1280x768, 4.2", 356DPI, 0.6f scale
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screen_get_display_property_iv(screen_disp, SCREEN_PROPERTY_DPI, &dpi);
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#else
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// Playbook: 1024x600, 7", 170DPI, 1.25f scale
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int screen_phys_size[2];
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screen_get_display_property_iv(screen_disp, SCREEN_PROPERTY_PHYSICAL_SIZE, screen_phys_size);
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//CCLog("screen_phys_size[%d,%d]", screen_phys_size[0], screen_phys_size[1]);
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int screen_resolution[2];
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screen_get_display_property_iv(screen_disp, SCREEN_PROPERTY_SIZE, screen_resolution);
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//CCLog("screen_resolution[%d,%d]", screen_resolution[0], screen_resolution[1]);
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double diagonal_pixels = sqrt((double)(screen_resolution[0] * screen_resolution[0] + screen_resolution[1] * screen_resolution[1]));
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// 1 millimeter = 0.0393700787 inches
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double diagonal_inches = 0.0393700787 * sqrt((double)(screen_phys_size[0] * screen_phys_size[0] + screen_phys_size[1] * screen_phys_size[1]));
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dpi = (int)(diagonal_pixels / diagonal_inches + 0.5);
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//CCLog("dpi = %d, pixel = %lf, inches = %lf", dpi, diagonal_pixels, diagonal_inches );
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#endif
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}
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//CCLog("dpi = %d", dpi);
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return dpi;
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}
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NS_CC_END
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