7.1.1.6ICEGD_ESCAPE_SET_FB_GAMMA_RAMP
| Input Data Structure | Output Data Structure |
| Notes |
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| esc_color_params flag options: |
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| Mandatory: |
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| GAMMA_FLAG (0x1) |
| esc_color_params_t | N/A |
| Not Applicable: |
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| BRIGHTNESS_FLAG (0x2) | ||
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| CONTRAST_FLAG (0x4) |
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| SATURATION_FLAG (0x8) |
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| OVL_COLOR_FLAG (0x10) |
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Description
This escape code is used to set frame buffer gamma correction ramp. Legal values are from
Input Data Structure Definition
Same data structure as ICEGD_ESCAPE_SET_OVL_COLOR_PARAMS, but for this escape code, you need only set the GAMMA_FLAG.
Example
esc_color_params_t color;
memset(&color, 0, sizeof(esc_color_params_t));
//set flag to gamma color.flag = GAMMA_FLAG; color.gamma = 0;
for(int i=1;i<10;i++){
//change gamma value gradually, and the legal value is between 1 and 500 color.gamma=i*50;
ExtEscape(
Hdc,
ICEGD_ESCAPE_SET_FB_GAMMA_RAMP, sizeof(esc_color_params_t), (LPCSTR)&color,
0,
NULL);
//Check error status returned by ExtEscape
//…
//Wait a while for HW to complete the operation of changing the gamma value Sleep(500);
}
Intel® Digital Set Top Box Display Driver | 35 |
User’s Guide for Microsoft* Windows* CE 5.0