86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
#pragma once
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//#include "util.h"
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#include "log.h"
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#include <windows.h>
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#include <gdiplus.h>
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static const std::wstring kImageJPEG = L"image/jpeg";
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static const std::wstring kImagePNG = L"image/png";
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static const std::wstring kImageBMP = L"image/bmp";
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static const std::wstring kImageGIF = L"image/gif";
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class ZoomImage
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{
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public:
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ZoomImage(void);
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~ZoomImage(void);
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//设置缩放后的图片保存路径
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void SetImagePath(const std::wstring &image_path);
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//设置为自动缩放模式
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void SetAutoZoom(bool area_zoom,int auto_max_with,int auto_max_height);
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//设置为固定大小缩放模式
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void SetSize(int width,int height);
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//设置为按比例缩放模式
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void SetRatio(float ratio);
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/*
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* @brief 缩放某一个图片，并保存到为指定格式
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* @param filepath:要缩放的源图片路径
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* @param mime_type:保存的图片类型
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*/
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bool Zoom(const std::wstring& filepath,std::wstring mime_type=L"image/jpeg");
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//把图片保存为指定类型，并不缩放图片
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bool ConvertImageFormat(std::wstring& filepath, std::wstring mime_type);
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//获取图像的翻转类型
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static Gdiplus::RotateFlipType GetRotateFlipType(Gdiplus::Image& image);
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static std::wstring GetMimeType(const std::wstring& filepath);
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static void GetMimeType(const std::wstring& filepath, std::wstring& mime_type_out, std::wstring& exten_out);
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/*
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* @brief 以width、height的比例，截取源图片中同比例的最大范围的图片部分，并保存到为指定格式
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* @param filepath:源图片路径
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* @param image_path_out:输出图片路径
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* @param width:要缩放的源图片路径
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* @param height:要缩放的源图片路径
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* @param mime_type:保存的图片类型
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*/
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static bool SavePaddingImage(const std::wstring& image_path, const std::wstring& image_path_out, int width, int height, std::wstring mime_type = L"image/jpeg");
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protected:
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//判断是否需要进行缩放
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bool IsNeedZoom(int width,int height);
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//计算缩放后的大小，结果保存到width_和height_
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bool CalculateSize(int width_src,int height_src);
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static bool GetImageCLSID(const wchar_t* format, CLSID* pCLSID);
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static bool SaveImage(Gdiplus::Image& image, const std::wstring& file_path,std::wstring mime_type,long quality_num = 95);
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static Gdiplus::RotateFlipType GetRotateFlipType(short orientation);
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static std::wstring GetMimeType(GUID& clsid);
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private:
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enum ZoomType
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{
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by_fixed_size = 0,
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by_ratio,
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by_auto,by_none
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};//by_fixed_size:按固定尺寸,by_ratio:按比率缩放;
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std::wstring file_path_save_;
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ZoomType zoom_type_;
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bool area_zoom_; //是否按面积缩放width*height;
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int auto_max_width_;
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int auto_max_height_;
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int width_;
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int height_;
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float ratio_;
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std::wstring image_path_;
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};
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//缩略图不超过max_width * max_height的情况下：返回值为true表示需要裁剪，同时按图片比例返回size
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bool CalculateImageSize(const std::wstring& file, SIZE& size, int max_width, int max_height);
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//生成缩略图，大小cx * cy
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void ZoomImageF(const std::wstring &src, const std::wstring &dest, int cx, int cy); |