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v2

This commit is contained in:
SunnyGor 2023-01-09 09:45:43 +08:00
parent c0e5f1dc84
commit eb95c5674d
4 changed files with 204 additions and 18 deletions
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40
bmp.c
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@ -28,12 +28,20 @@ struct BmpInfoHeader {
#pragma pack()
void bmpWrite(const char* name, const uch* raw_img, uint32_t width, uint32_t height, uint16_t bits)
void bmpWrite(const char* name, const uch* raw_img, uint32_t width, uint32_t height, uint16_t bits, const char* old_name, double radio)
{
if(!(name && raw_img)) {
perror("Error bmpWrite.");
return;
}
unsigned long oldWidth, oldHeight, oldSize, newWidth, newHeight, newSize;
oldWidth = width;
oldHeight = height;
newWidth = ((int)(oldWidth * radio) + 3) / 4 * 4;//图像显示不出来原因在于图像长或宽不是4的倍数 保证得到的宽高是4的倍数
newHeight = ((int)(oldHeight * radio) + 3) / 4 * 4;
// 檔案資訊
struct BmpFileHeader file_h = {
.bfTybe=0x4d42,
@ -41,7 +49,7 @@ void bmpWrite(const char* name, const uch* raw_img, uint32_t width, uint32_t hei
.bfReserved2=0,
.bfOffBits=54,
};
file_h.bfSize = file_h.bfOffBits + width*height * bits/8;
file_h.bfSize = file_h.bfOffBits + newWidth*newHeight * bits/8;
if(bits==8) {file_h.bfSize+= 1024, file_h.bfOffBits+= 1024;}
// 圖片資訊
struct BmpInfoHeader info_h = {
@ -53,10 +61,10 @@ void bmpWrite(const char* name, const uch* raw_img, uint32_t width, uint32_t hei
.biClrUsed=0,
.biClrImportant=0,
};
info_h.biWidth = width;
info_h.biHeight = height;
info_h.biWidth = newWidth;
info_h.biHeight = newHeight;
info_h.biBitCount = bits;
info_h.biSizeImage = width*height * bits/8;
info_h.biSizeImage = newWidth*newHeight * bits/8;
if(bits == 8) {info_h.biClrUsed=256;}
// 寫入檔頭
FILE *pFile = NULL;
@ -88,18 +96,16 @@ void bmpWrite(const char* name, const uch* raw_img, uint32_t width, uint32_t hei
fwrite((char*)&raw_img[idx*3 +1], sizeof(char), sizeof(uch), pFile);
fwrite((char*)&raw_img[idx*3 +0], sizeof(char), sizeof(uch), pFile);
unsigned long oldWidth, oldHeight, oldSize, newWidth, newHeight, newSize;
// unsigned long oldWidth, oldHeight, oldSize, newWidth, newHeight, newSize;
oldWidth = width;
oldHeight = height;
// oldWidth = width;
// oldHeight = height;
unsigned char *sourceData = (unsigned char*)malloc(oldSize);//该指针指向源位图文件图像数据的内存空间
fseek(src_file, 54, SEEK_SET);//使文件的指针指向文件的第55个字节
fread(sourceData, oldSize, 1, src_file);//将src_file中的图像数据存储到sourceData指向的内存空间
fseek(old_name, 54, SEEK_SET);//使文件的指针指向文件的第55个字节
fread(sourceData, oldSize, 1, old_name);//将src_file中的图像数据存储到sourceData指向的内存空间
double radio = 1.0;// test 倍數
newWidth = ((int)(oldWidth * radio) + 3) / 4 * 4;//图像显示不出来原因在于图像长或宽不是4的倍数 下面这一步可以保证得到的宽高是4的倍数
newHeight = ((int)(oldHeight * radio) + 3) / 4 * 4;
// newWidth = ((int)(oldWidth * radio) + 3) / 4 * 4;//图像显示不出来原因在于图像长或宽不是4的倍数 下面这一步可以保证得到的宽高是4的倍数
// newHeight = ((int)(oldHeight * radio) + 3) / 4 * 4;
//10.使用最邻近插值算法进行图片缩放
unsigned int x,y,X,Y;//源位图文件像素点宽高和目标位图文件像素点宽高
@ -186,9 +192,9 @@ void Imgraw_Read(const Imgraw* _this, const char* name) {
const Imgraw* p = _this;
bmpRead(name, &p->data, &p->width, &p->height, &p->bits);
}
void Imgraw_Writ(const Imgraw* _this, const char* name) {
void Imgraw_Writ(const Imgraw* _this, const char* name, const char* old_name) {
const Imgraw* p = _this;
bmpWrite(name, p->data, p->width, p->height, p->bits);
bmpWrite(name, p->data, p->width, p->height, p->bits, old_name, 1.0);
}
/*==============================================================*/
int main(int argc, char const *argv[]) {
@ -197,7 +203,7 @@ int main(int argc, char const *argv[]) {
// 讀圖
Imgraw_Read(&img, "./input/bw2x1.bmp");
// 寫圖
Imgraw_Writ(&img, "./output/bw2x1(output).bmp");
Imgraw_Writ(&img, "./output/bw2x1(output).bmp", "./input/bw2x1.bmp");
return 0;
}
/*==============================================================*/

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180
bmp_copy_demo.c Normal file
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@ -0,0 +1,180 @@
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
typedef unsigned char uch;
// ™n°¸½Y˜‹
#pragma pack(2)
struct BmpFileHeader {
uint16_t bfTybe;
uint32_t bfSize;
uint16_t bfReserved1;
uint16_t bfReserved2;
uint32_t bfOffBits;
};
struct BmpInfoHeader {
uint32_t biSize;
uint32_t biWidth;
uint32_t biHeight;
uint16_t biPlanes; // 1=defeaul, 0=custom
uint16_t biBitCount;
uint32_t biCompression;
uint32_t biSizeImage;
uint32_t biXPelsPerMeter; // 72dpi=2835, 96dpi=3780
uint32_t biYPelsPerMeter; // 120dpi=4724, 300dpi=11811
uint32_t biClrUsed;
uint32_t biClrImportant;
};
#pragma pack()
void bmpWrite(const char* name, const uch* raw_img,
uint32_t width, uint32_t height, uint16_t bits)
{
if(!(name && raw_img)) {
perror("Error bmpWrite.");
return;
}
// ™n°¸ÙYÓ<59>
struct BmpFileHeader file_h = {
.bfTybe=0x4d42,
.bfReserved1=0,
.bfReserved2=0,
.bfOffBits=54,
};
file_h.bfSize = file_h.bfOffBits + width*height * bits/8;
if(bits==8) {file_h.bfSize+= 1024, file_h.bfOffBits+= 1024;}
// ˆDƬÙYÓ<59>
struct BmpInfoHeader info_h = {
.biSize=40,
.biPlanes=1,
.biCompression=0,
.biXPelsPerMeter=0,
.biYPelsPerMeter=0,
.biClrUsed=0,
.biClrImportant=0,
};
info_h.biWidth = width;
info_h.biHeight = height;
info_h.biBitCount = bits;
info_h.biSizeImage = width*height * bits/8;
if(bits == 8) {info_h.biClrUsed=256;}
// Œ‘Èë™nî^
FILE *pFile = NULL;
// pFile = fopen(name,"wb+");
fopen_s(&pFile, name,"wb+");
if(!pFile) {
perror("Error opening file.");
return;
}
fwrite((char*)&file_h, sizeof(char), sizeof(file_h), pFile);
fwrite((char*)&info_h, sizeof(char), sizeof(info_h), pFile);
// Œ‘Õ{É«±P
if(bits == 8) {
for(unsigned i = 0; i < 256; ++i) {
uch c = i;
fwrite((char*)&c, sizeof(char), sizeof(uch), pFile);
fwrite((char*)&c, sizeof(char), sizeof(uch), pFile);
fwrite((char*)&c, sizeof(char), sizeof(uch), pFile);
fwrite("", sizeof(char), sizeof(uch), pFile);
}
}
// Œ‘ÈëˆDƬÙYÓ<59>
size_t alig = ((width*bits/8)*3) % 4;
for(int j = height-1; j >= 0; --j) {
for(unsigned i = 0; i < width; ++i) {
uint32_t idx = j*width +i;
if(bits == 24) { // RGBˆDƬ
fwrite((char*)&raw_img[idx*3 +2],
sizeof(char), sizeof(uch), pFile);
fwrite((char*)&raw_img[idx*3 +1],
sizeof(char), sizeof(uch), pFile);
fwrite((char*)&raw_img[idx*3 +0],
sizeof(char), sizeof(uch), pFile);
} else if(bits == 8) { // »ÒëAˆD
fwrite((char*)&raw_img[idx],
sizeof(char), sizeof(uch), pFile);
}
}
// Œ¦ýR4byte
for(size_t i = 0; i < alig; ++i) {
fwrite("", sizeof(char), sizeof(uch), pFile);
}
}
fclose(pFile);
}
void bmpRead(const char* name, uch** raw_img,
uint32_t* width, uint32_t* height, uint16_t* bits)
{
if(!(name && raw_img && width && height && bits)) {
perror("Error bmpRead.");
return;
}
// ™n°¸ÙYÓ<59>
struct BmpFileHeader file_h;
// ˆDƬÙYÓ<59>
struct BmpInfoHeader info_h;
// ×xÈ¡™nî^
FILE *pFile = NULL;
// pFile = fopen(name, "rb+");
fopen_s(&pFile, name, "rb+");
if(!pFile) {
perror("Error opening file.");
return;
}
fread((char*)&file_h, sizeof(char), sizeof(file_h), pFile);
fread((char*)&info_h, sizeof(char), sizeof(info_h), pFile);
// ×xÈ¡éLŒ’
*width = info_h.biWidth;
*height = info_h.biHeight;
*bits = info_h.biBitCount;
size_t ImgSize = ((size_t)*width) * ((size_t)*height) * 3;
*raw_img = (uch*)calloc(ImgSize, sizeof(uch));
// ×xÈ¡×xƬÙYÓ<59>ÞDRAW™nÙYÓ<59>
fseek(pFile, file_h.bfOffBits, SEEK_SET);
size_t alig = ((info_h.biWidth*info_h.biBitCount/8)*3) % 4;
for(int j = *height-1; j >= 0; --j) {
for(unsigned i = 0; i < *width; ++i) {
uint32_t idx = j*(*width)+i;
if(*bits == 24) { // RGBˆDƬ
fread((char*)&(*raw_img)[idx*3 +2],
sizeof(char), sizeof(uch), pFile);
fread((char*)&(*raw_img)[idx*3 +1],
sizeof(char), sizeof(uch), pFile);
fread((char*)&(*raw_img)[idx*3 +0],
sizeof(char), sizeof(uch), pFile);
} else if(*bits == 8) { // »ÒëAˆD
fread((char*)&(*raw_img)[idx],
sizeof(char), sizeof(uch), pFile);
}
}
fseek(pFile , (long)alig , SEEK_CUR);
}
fclose(pFile);
}
// ˆDÏñ½Y˜‹
typedef struct Imgraw {
uint32_t width, height;
uint16_t bits;
uch* data;
} Imgraw;
void Imgraw_Read(const Imgraw* _this, const char* name) {
const Imgraw* p = _this;
bmpRead(name, &p->data, &p->width, &p->height, &p->bits);
}
void Imgraw_Writ(const Imgraw* _this, const char* name) {
const Imgraw* p = _this;
bmpWrite(name, p->data, p->width, p->height, p->bits);
}
/*==============================================================*/
int main(int argc, char const *argv[]) {
// ½¨˜‹
Imgraw img = {0, 0, 0, NULL};
// ×xˆD
Imgraw_Read(&img, "./input/bw2x1.bmp");
// Œ‘ˆD
Imgraw_Writ(&img, "./output/bw2x1(output).bmp");
return 0;
}
/*==============================================================*/

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bmp_copy_demo.exe Normal file
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