[Icore dual-core development board tutorial] [BMP file structure and Decoding Implementation]

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1. Overview of BMP Images

Modern portable devices often need to display some images in the system. The BMP format is one of the most representative. BMP (Bitmap) is a standard image file format in Windows operating systems. It is widely used and has nothing to do with hardware devices. It uses a bit ing storage format. The image depth of a BMP file can be 1, 4, 8, 16, or 24bit. The data in the data area is linear, with the primary order of the row, followed by the B value of point 1, the G value of point 1, and the R value of point 1, B value of point 2, G value of point 2, R value of point 2, and so on. Note: In Windows, BMP files are generally read in accordance with the line-backward scan conventions. At this time, the image scanning method is from left to right, from bottom to top. Scan Method 1:

1. BMP file format

The data of a BMP file is generally composed of four parts: the bitmap file header, bitmap information header, palette, and bitmap data, as shown in table 1.

Table 1 bitmap file classification

Block name	Size/bit
Bitmap File Header	14
Bitmap header	40
Color palette (optional)	8 (1-Bit Bitmap palette) 64 (4-Bit Bitmap palette) 1024 (8-Bit Bitmap palette)
Bitmap data	Determined by the actual size of the image

The Bitmap header and information header of the BMP file are the first data in the file and can be called the BMP data header. The BMP data header structure is the main structure of the BMP file, suchCode1.

Code 1 BMP data header Structure

Typedef_ PackedStruct{ Unsigned CharType [2]; Unsigned Long IntFile_size; Unsigned Long IntReserved; Unsigned Long IntOffset; Unsigned Long IntHeader_info_size; // 0x28 Unsigned Long IntWidth; // The width of the captured bitmap. Unsigned Long IntHeight; Unsigned Short IntPlanes; // The number of bit faces of a bitmap, which is usually 1 Unsigned Short IntBit_count; // 1 4 8 16 24 32 Unsigned Long IntCompression; // Compression Unsigned Long IntImage_size; // can set 0 (RGB) Unsigned Long IntXpels_per_meter; // horizontal resolution per meter Unsigned Long IntYpels_per_meter; Unsigned Long IntColor_used; // number of colors used Unsigned Long IntColor_important; // specify the number of important colors } BMP _header_t;

 

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