7.1.1.6ICEGD_ESCAPE_SET_FB_GAMMA_RAMP

 

Input Data Structure

Output Data Structure

 

Notes

 

 

 

 

 

 

 

 

 

esc_color_params flag options:

 

 

 

 

Mandatory:

 

 

 

 

GAMMA_FLAG (0x1)

 

esc_color_params_t

N/A

 

Not Applicable:

 

 

BRIGHTNESS_FLAG (0x2)

 

 

 

 

 

 

 

 

CONTRAST_FLAG (0x4)

 

 

 

 

SATURATION_FLAG (0x8)

 

 

 

 

OVL_COLOR_FLAG (0x10)

 

 

 

 

 

Description

This escape code is used to set frame buffer gamma correction ramp. Legal values are from 1-500, 1 - default, 500 – brightest.

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

Page 35
Image 35
Intel 82854 GMCH, 82830M GMCH manual Icegdescapesetfbgammaramp

82830M GMCH, 82854 GMCH specifications

The Intel 82854 GMCH (Graphics Memory Controller Hub) and the Intel 82830M GMCH are integral components in the architecture of Intel's mobile chipsets, designed to enhance performance and efficiency in laptop and portable computing environments. These chipsets play a crucial role in managing the interactions between the CPU, memory, and graphics, thus impacting overall system performance.

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The Intel 82830M GMCH, on the other hand, was part of the 855PM chipset family and is targeted primarily at mainstream laptops. It offers similar features in terms of integrated graphics with the Intel Graphics Media Accelerator. However, it also extends support for advanced features such as the 533 MHz front-side bus, which facilitates quicker data transfer between the CPU and memory.

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