LineageOS/android_vendor_qcom_opensource_display-commonsys-intf
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hwc: Calculate DPI values according to changed resolution

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If dynamic FB feature is enabled, calculate xdpi, ydpi
values based on new resolution.

Change-Id: Icbc8d2161082f60983532d1a57d9142653c65e9a
This commit is contained in:
Praveena Pachipulusu
2014-06-06 19:22:23 +05:30
parent 7696761071
commit 49d6206ca3
1 changed files with 9 additions and 2 deletions
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11
libhwcomposer/hwc_utils.cpp
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@@ -83,7 +83,8 @@ bool isValidResolution(hwc_context_t *ctx, uint32_t xres, uint32_t yres)
(xres < MIN_DISPLAY_XRES || yres < MIN_DISPLAY_YRES));
}
void changeResolution(hwc_context_t *ctx, int xres_orig, int yres_orig) {
void changeResolution(hwc_context_t *ctx, int xres_orig, int yres_orig,
int width, int height) {
//Store original display resolution.
ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xres_new = xres_orig;
ctx->dpyAttr[HWC_DISPLAY_PRIMARY].yres_new = yres_orig;
@@ -99,6 +100,12 @@ void changeResolution(hwc_context_t *ctx, int xres_orig, int yres_orig) {
ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xres_new = xres_new;
ctx->dpyAttr[HWC_DISPLAY_PRIMARY].yres_new = yres_new;
ctx->dpyAttr[HWC_DISPLAY_PRIMARY].customFBSize = true;
//Caluculate DPI according to changed resolution.
float xdpi = ((float)xres_new * 25.4f) / (float)width;
float ydpi = ((float)yres_new * 25.4f) / (float)height;
ctx->dpyAttr[HWC_DISPLAY_PRIMARY].xdpi = xdpi;
ctx->dpyAttr[HWC_DISPLAY_PRIMARY].ydpi = ydpi;
}
}
}
@@ -168,7 +175,7 @@ static int openFramebufferDevice(hwc_context_t *ctx)
(uint32_t)(1000000000l / fps);
//To change resolution of primary display
changeResolution(ctx, info.xres, info.yres);
changeResolution(ctx, info.xres, info.yres, info.width, info.height);
//Unblank primary on first boot
if(ioctl(fb_fd, FBIOBLANK,FB_BLANK_UNBLANK) < 0) {