Step to UEFI (59） —– BMP 放在EFI文件中（上）

前面介绍了如何 Load 一幅 BMP 图片然后显示出来，然后就有一个问题：如何把这个图片也放在 EFI 文件中？ 毕竟放在一起会显得更加专业。在【参考1】上，也有朋友问了同样的问题，博主的建议是“写个脚本直接把图片变成像素数组，直接弄，这样很简单”。下面就来实验一下。

首先，需要找一个将图片转为 C Header的工具。我找到的是 Bin2C 这个工具【参考2】. 用下面的命令即可完成转换，生成 show.h

bin2c -o show.h Untitled.bmp

转换之后 show.h 大概就是下面这个样子

showbmp2

然后，修改之前显示 BMP 的那个程序，用 include 来引用用到的 BMP 数据, 去掉 Load 文件的过程,直接使用内存地址。

#include  <Uefi.h>
#include  <Library/UefiLib.h>
#include  <Library/ShellCEntryLib.h>

#include  <stdio.h>
#include  <stdlib.h>
#include  <wchar.h>
#include  <time.h>
#include <Protocol/EfiShell.h>
#include <Library/ShellLib.h>

#include <Protocol/SimpleFileSystem.h>
#include <Protocol/BlockIo.h>
#include <Library/DevicePathLib.h>
#include <Library/HandleParsingLib.h>
#include <Library/SortLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/BaseMemoryLib.h>

#include <Protocol/LoadedImage.h>

#define MAX_FILE_SIZE (1024*1024*1024)

extern EFI_BOOT_SERVICES         *gBS;
extern EFI_SYSTEM_TABLE			 *gST;
extern EFI_RUNTIME_SERVICES 	 *gRT;

extern EFI_SHELL_ENVIRONMENT2    *mEfiShellEnvironment2;
extern EFI_HANDLE				 gImageHandle;

static EFI_GUID GraphicsOutputProtocolGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
static EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput = NULL;

#pragma pack(1)

//Copied from  C\MdePkg\Include\Protocol\UgaDraw.h
typedef struct {
  UINT8 Blue;
  UINT8 Green;
  UINT8 Red;
  UINT8 Reserved;
} EFI_UGA_PIXEL;

/* This should be compatible with EFI_UGA_PIXEL */
typedef struct {
    UINT8 b, g, r, a;
} EG_PIXEL;

typedef struct {
    CHAR8         CharB;
    CHAR8         CharM;
    UINT32        Size;
    UINT16        Reserved[2];
    UINT32        ImageOffset;
    UINT32        HeaderSize;
    UINT32        PixelWidth;
    UINT32        PixelHeight;
    UINT16        Planes;       // Must be 1
    UINT16        BitPerPixel;  // 1, 4, 8, or 24
    UINT32        CompressionType;
    UINT32        ImageSize;    // Compressed image size in bytes
    UINT32        XPixelsPerMeter;
    UINT32        YPixelsPerMeter;
    UINT32        NumberOfColors;
    UINT32        ImportantColors;
} BMP_IMAGE_HEADER;

typedef struct {
    UINTN       Width;
    UINTN       Height;
    BOOLEAN     HasAlpha;
    EG_PIXEL    *PixelData;
} EG_IMAGE;
#pragma pack()

//const unsigned char Untitled_bmp[289654] 
#include "show.h"

VOID egFreeImage(IN EG_IMAGE *Image)
{
    if (Image != NULL) {
        if (Image->PixelData != NULL)
            FreePool(Image->PixelData);
        FreePool(Image);
    }
}

//
// Basic image handling
//

EG_IMAGE * egCreateImage(IN UINTN Width, IN UINTN Height, IN BOOLEAN HasAlpha)
{
    EG_IMAGE        *NewImage;
    
    NewImage = (EG_IMAGE *) AllocatePool(sizeof(EG_IMAGE));
    if (NewImage == NULL)
        return NULL;
    NewImage->PixelData = (EG_PIXEL *) AllocatePool(
								Width * Height * sizeof(EG_PIXEL));
    if (NewImage->PixelData == NULL) {
        FreePool(NewImage);
        return NULL;
    }

    NewImage->Width = Width;
    NewImage->Height = Height;
    NewImage->HasAlpha = HasAlpha;
    return NewImage;
}

//
// Load BMP image
//

EG_IMAGE * egDecodeBMP
	(
		IN UINT8 *FileData, 
		IN UINTN FileDataLength, 
		IN BOOLEAN WantAlpha)
{
    EG_IMAGE            *NewImage;
    BMP_IMAGE_HEADER    *BmpHeader;
    EFI_UGA_PIXEL       *BmpColorMap;
    UINTN               x, y;
    UINT8               *ImagePtr;
    UINT8               *ImagePtrBase;
    UINTN               ImageLineOffset;
    UINT8               ImageValue=0, AlphaValue;
    EG_PIXEL            *PixelPtr;
    UINTN               Index, BitIndex;

    // read and check header
    if (FileDataLength < sizeof(BMP_IMAGE_HEADER) || FileData == NULL)
        return NULL;

    BmpHeader = (BMP_IMAGE_HEADER *) FileData;
    if (BmpHeader->CharB != 'B' || BmpHeader->CharM != 'M')
        return NULL;

    if (BmpHeader->CompressionType != 0)
        return NULL;

    if (BmpHeader->BitPerPixel != 1 && BmpHeader->BitPerPixel != 4 &&
        BmpHeader->BitPerPixel != 8 && BmpHeader->BitPerPixel != 24)
        return NULL;

    // calculate parameters
    ImageLineOffset = BmpHeader->PixelWidth;
    if (BmpHeader->BitPerPixel == 24)
        ImageLineOffset *= 3;
    else if (BmpHeader->BitPerPixel == 1)
        ImageLineOffset = (ImageLineOffset + 7) >> 3;
    else if (BmpHeader->BitPerPixel == 4)
        ImageLineOffset = (ImageLineOffset + 1) >> 1;
    if ((ImageLineOffset % 4) != 0)
        ImageLineOffset = ImageLineOffset + (4 - (ImageLineOffset % 4));
    // check bounds
    if (BmpHeader->ImageOffset + 
			ImageLineOffset * BmpHeader->PixelHeight > FileDataLength)
        return NULL;
    
    // allocate image structure and buffer
    NewImage = egCreateImage(BmpHeader->PixelWidth, 
								BmpHeader->PixelHeight, WantAlpha);
    if (NewImage == NULL)
        return NULL;
    AlphaValue = WantAlpha ? 255 : 0;
    
    // convert image
    BmpColorMap = (EFI_UGA_PIXEL *)(FileData + sizeof(BMP_IMAGE_HEADER));
    ImagePtrBase = FileData + BmpHeader->ImageOffset;
    for (y = 0; y < BmpHeader->PixelHeight; y++) {
        ImagePtr = ImagePtrBase;
        ImagePtrBase += ImageLineOffset;
        PixelPtr = NewImage->PixelData + 
				(BmpHeader->PixelHeight - 1 - y) * BmpHeader->PixelWidth;
        
        switch (BmpHeader->BitPerPixel) {
            
            case 1:
                for (x = 0; x < BmpHeader->PixelWidth; x++) {
                    BitIndex = x & 0x07;
                    if (BitIndex == 0)
                        ImageValue = *ImagePtr++;
                    
                    Index = (ImageValue >> (7 - BitIndex)) & 0x01;
                    PixelPtr->b = BmpColorMap[Index].Blue;
                    PixelPtr->g = BmpColorMap[Index].Green;
                    PixelPtr->r = BmpColorMap[Index].Red;
                    PixelPtr->a = AlphaValue;
                    PixelPtr++;
                }
                break;
            
            case 4:
                for (x = 0; x <= BmpHeader->PixelWidth - 2; x += 2) {
                    ImageValue = *ImagePtr++;
                    
                    Index = ImageValue >> 4;
                    PixelPtr->b = BmpColorMap[Index].Blue;
                    PixelPtr->g = BmpColorMap[Index].Green;
                    PixelPtr->r = BmpColorMap[Index].Red;
                    PixelPtr->a = AlphaValue;
                    PixelPtr++;
                    
                    Index = ImageValue & 0x0f;
                    PixelPtr->b = BmpColorMap[Index].Blue;
                    PixelPtr->g = BmpColorMap[Index].Green;
                    PixelPtr->r = BmpColorMap[Index].Red;
                    PixelPtr->a = AlphaValue;
                    PixelPtr++;
                }
                if (x < BmpHeader->PixelWidth) {
                    ImageValue = *ImagePtr++;
                    
                    Index = ImageValue >> 4;
                    PixelPtr->b = BmpColorMap[Index].Blue;
                    PixelPtr->g = BmpColorMap[Index].Green;
                    PixelPtr->r = BmpColorMap[Index].Red;
                    PixelPtr->a = AlphaValue;
                    PixelPtr++;
                }
                break;
            
            case 8:
                for (x = 0; x < BmpHeader->PixelWidth; x++) {
                    Index = *ImagePtr++;
                    PixelPtr->b = BmpColorMap[Index].Blue;
                    PixelPtr->g = BmpColorMap[Index].Green;
                    PixelPtr->r = BmpColorMap[Index].Red;
                    PixelPtr->a = AlphaValue;
                    PixelPtr++;
                }
                break;
            
            case 24:
                for (x = 0; x < BmpHeader->PixelWidth; x++) {
                    PixelPtr->b = *ImagePtr++;
                    PixelPtr->g = *ImagePtr++;
                    PixelPtr->r = *ImagePtr++;
                    PixelPtr->a = AlphaValue;
                    PixelPtr++;
                }
                break;
            
        }
    }
    
    return NewImage;
}


int
EFIAPI
main (                                         
  IN int Argc,
  IN char **Argv
  )
{
    EFI_STATUS    Status;
    EG_IMAGE        *Image;	

	
    Status = gBS->LocateProtocol(&GraphicsOutputProtocolGuid, 
						NULL, (VOID **) &GraphicsOutput);
    if (EFI_ERROR(Status)) {
        GraphicsOutput = NULL;
		Print(L"Loading Graphics_Output_Protocol error!\n");
		return EFI_SUCCESS;
	}	
	
    Image=egDecodeBMP((UINT8 *)&Untitled_bmp, Untitled_bmp_size, FALSE);

    Print(L"Image height [%d]:width[%d]",
					Image->Height,
					Image->Width);

	GraphicsOutput->Blt(
				GraphicsOutput, 
				(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *) Image->PixelData,
				EfiBltBufferToVideo,
                0, 
				0 , 
				0x100, 
				0x20, 
				Image->Width, 
				Image->Height, 0); 					
	
  return EFI_SUCCESS;
  
}

 

运行结果：

showbmp2a

Bin2C 下载（内含原始图片）

bin2c

源代码下载

GFXTest7

参考：

1.http://www.cppblog.com/djxzh/archive/2015/02/08/209766.html 补充《UEFI原理与编程》中关于Edk2的调试

2. http://sourceforge.net/projects/bin2c/

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