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image.cpp
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/*
* EGE (Easy Graphics Engine)
* filename image.cpp
本文件集中所有对image基本操作的接口和类定义
*/
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#ifndef _CRT_SECURE_NO_DEPRECATE
#define _CRT_SECURE_NO_DEPRECATE
#endif
#include "ege_head.h"
#include "ege_common.h"
#include "ege_dllimport.h"
#include "image.h"
// #ifdef _ITERATOR_DEBUG_LEVEL
// #undef _ITERATOR_DEBUG_LEVEL
// #endif
#include <png.h>
#include <math.h>
#include <limits.h>
namespace ege
{
void IMAGE::reset()
{
m_initflag = IMAGE_INIT_FLAG;
m_hDC = NULL;
m_hBmp = NULL;
m_width = 0;
m_height = 0;
m_pBuffer = NULL;
m_linecolor = 0;
m_fillcolor = 0;
m_textcolor = 0;
m_bk_color = 0;
m_aa = false;
memset(&m_vpt, 0, sizeof(m_vpt));
memset(&m_texttype, 0, sizeof(m_texttype));
memset(&m_linestyle, 0, sizeof(m_linestyle));
m_linewidth = 0.0f;
m_linestartcap = LINECAP_FLAT;
m_lineendcap = LINECAP_FLAT;
m_linejoin = LINEJOIN_MITER;
m_linejoinmiterlimit = 10.0f;
m_texture = NULL;
#ifdef EGE_GDIPLUS
m_graphics = NULL;
m_pen = NULL;
m_brush = NULL;
#endif
}
/**
* 构造宽高为 width x height 的图像。
* @param width
* @param height
* @note: 创建的图像内容未定义，但经检测像素值均为 0。
*/
void IMAGE::construct(int width, int height)
{
HDC refDC = NULL;
if (graph_setting.hwnd) {
refDC = ::GetDC(graph_setting.hwnd);
}
dll::loadDllsIfNot();
gdiplusinit();
reset();
initimage(refDC, width, height);
setdefaultattribute();
if (refDC) {
::ReleaseDC(graph_setting.hwnd, refDC);
}
}
/**
* 构造宽高为 width x height 的图像，将 color 设为背景色并以 color 填充整个图像。
* @param width
* @param height
* @param color
*/
void IMAGE::construct(int width, int height, color_t color)
{
construct(width, height);
setbkcolor_f(color, this);
cleardevice(this);
}
IMAGE::IMAGE()
{
construct(1, 1, BLACK);
}
IMAGE::IMAGE(int width, int height)
{
// 截止到 0
if (width < 0) {
width = 0;
}
if (height < 0) {
height = 0;
}
construct(width, height);
}
IMAGE::IMAGE(int width, int height, color_t color)
{
// 截止到 0
if (width < 0) {
width = 0;
}
if (height < 0) {
height = 0;
}
construct(width, height, color);
}
IMAGE::IMAGE(const IMAGE& img)
{
reset();
initimage(img.m_hDC, img.m_width, img.m_height);
setdefaultattribute();
BitBlt(m_hDC, 0, 0, img.m_width, img.m_height, img.m_hDC, 0, 0, SRCCOPY);
}
IMAGE::~IMAGE()
{
gentexture(false);
deleteimage();
}
void IMAGE::inittest(const WCHAR* strCallFunction) const
{
if (m_initflag != IMAGE_INIT_FLAG) {
WCHAR str[60];
wsprintfW(str, L"Fatal error: read/write at 0x%p. At function '%s'", this, strCallFunction);
MessageBoxW(graph_setting.hwnd, str, L"EGE ERROR message", MB_ICONSTOP);
ExitProcess((UINT)grError);
}
}
void IMAGE::gentexture(bool gen)
{
if (!gen) {
if (m_texture != NULL) {
delete (Gdiplus::Bitmap*)m_texture;
m_texture = NULL;
}
} else {
if (m_texture != NULL) {
gentexture(false);
}
Gdiplus::Bitmap* bitmap =
new Gdiplus::Bitmap(getwidth(), getheight(), getwidth() * 4, PixelFormat32bppARGB, (BYTE*)getbuffer());
m_texture = bitmap;
}
}
int IMAGE::deleteimage()
{
#ifdef EGE_GDIPLUS
if (NULL != m_graphics) {
delete m_graphics;
}
m_graphics = NULL;
if (NULL != m_pen) {
delete m_pen;
}
m_pen = NULL;
if (NULL != m_brush) {
delete m_brush;
}
m_brush = NULL;
#endif
HBITMAP hbmp = (HBITMAP)GetCurrentObject(m_hDC, OBJ_BITMAP);
HBRUSH hbr = (HBRUSH)GetCurrentObject(m_hDC, OBJ_BRUSH);
HPEN hpen = (HPEN)GetCurrentObject(m_hDC, OBJ_PEN);
HFONT hfont = (HFONT)GetCurrentObject(m_hDC, OBJ_FONT);
DeleteDC(m_hDC);
m_hDC = NULL;
DeleteObject(hbmp);
DeleteObject(hbr);
DeleteObject(hpen);
DeleteObject(hfont);
return 0;
}
HBITMAP newbitmap(int width, int height, PDWORD* p_bmp_buf)
{
HBITMAP bitmap;
BITMAPINFO bmi = {{0}};
PDWORD bmp_buf;
// 截止到 1
if (width < 1) {
width = 1;
}
if (height < 1) {
height = 1;
}
bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
bmi.bmiHeader.biWidth = width;
bmi.bmiHeader.biHeight = -height;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biSizeImage = width * height * 4;
bitmap = CreateDIBSection(NULL, &bmi, DIB_RGB_COLORS, (VOID**)&bmp_buf, NULL, 0);
if (p_bmp_buf) {
*p_bmp_buf = bmp_buf;
}
return bitmap;
}
void IMAGE::initimage(HDC refDC, int width, int height)
{
HDC dc = CreateCompatibleDC(refDC);
PDWORD bmp_buf;
HBITMAP bitmap = newbitmap(width, height, &bmp_buf);
if (bitmap == NULL) {
internal_panic(L"Fatal Error: Create Bitmap fail in 'IMAGE::initimage'");
}
::SelectObject(dc, bitmap);
m_hDC = dc;
m_hBmp = bitmap;
m_width = width;
m_height = height;
m_pBuffer = bmp_buf;
setviewport(0, 0, m_width, m_height, 1, this);
}
void IMAGE::setdefaultattribute()
{
setlinecolor(initial_line_color, this);
settextcolor(initial_text_color, this);
setbkcolor_f(initial_bk_color, this);
SetBkMode(m_hDC, OPAQUE);
setfillstyle(SOLID_FILL, initial_fill_color, this);
setlinestyle(PS_SOLID, 0, 1, this);
settextjustify(LEFT_TEXT, TOP_TEXT, this);
setfont(16, 0, "SimSun", this);
enable_anti_alias(false);
}
#ifdef EGE_GDIPLUS
Gdiplus::Graphics* IMAGE::getGraphics()
{
if (NULL == m_graphics) {
m_graphics = new Gdiplus::Graphics(m_hDC);
m_graphics->SetPixelOffsetMode(Gdiplus::PixelOffsetModeHalf);
m_graphics->SetSmoothingMode(m_aa ? Gdiplus::SmoothingModeAntiAlias : Gdiplus::SmoothingModeNone);
m_graphics->SetTextRenderingHint(
m_aa ? Gdiplus::TextRenderingHintAntiAlias : Gdiplus::TextRenderingHintSystemDefault);
}
return m_graphics;
}
Gdiplus::Pen* IMAGE::getPen()
{
if (NULL == m_pen) {
m_pen = new Gdiplus::Pen(m_linecolor, m_linewidth);
m_pen->SetDashStyle(linestyle_to_dashstyle(m_linestyle.linestyle));
}
return m_pen;
}
Gdiplus::Brush* IMAGE::getBrush()
{
if (NULL == m_brush) {
m_brush = new Gdiplus::SolidBrush(m_fillcolor);
}
return m_brush;
}
void IMAGE::set_pattern(Gdiplus::Brush* brush)
{
if (NULL != m_brush) {
delete m_brush;
}
m_brush = brush;
}
#endif
void IMAGE::enable_anti_alias(bool enable)
{
m_aa = enable;
#ifdef EGE_GDIPLUS
if (NULL != m_graphics) {
m_graphics->SetSmoothingMode(m_aa ? Gdiplus::SmoothingModeAntiAlias : Gdiplus::SmoothingModeNone);
m_graphics->SetTextRenderingHint(
m_aa ? Gdiplus::TextRenderingHintAntiAlias : Gdiplus::TextRenderingHintSystemDefault);
}
#endif
}
int IMAGE::resize_f(int width, int height)
{
inittest(L"IMAGE::resize_f");
// 截止到 0
if (width < 0) {
width = 0;
}
if (height < 0) {
height = 0;
}
if (width == m_width && height == m_height) {
setviewport(0, 0, m_width, m_height, 1, this);
return 0;
}
PDWORD bmp_buf;
HBITMAP bitmap = newbitmap(width, height, &bmp_buf);
HBITMAP old_bitmap = (HBITMAP)SelectObject(this->m_hDC, bitmap);
DeleteObject(old_bitmap);
m_hBmp = bitmap;
m_width = width;
m_height = height;
m_pBuffer = bmp_buf;
SelectClipRgn(this->m_hDC, NULL);
// BITMAP 更换后需重新创建 Graphics 对象(否则会在已销毁的 old_bitmap 上绘制，引发异常)
if (m_graphics != NULL) {
Gdiplus::Graphics* newGraphics = recreateGdiplusGraphics(m_hDC, m_graphics);
delete m_graphics;
m_graphics = newGraphics;
}
setviewport(0, 0, m_width, m_height, 1, this);
return 0;
}
int IMAGE::resize(int width, int height)
{
inittest(L"IMAGE::resize");
int ret = this->resize_f(width, height);
cleardevice(this);
return ret;
}
IMAGE& IMAGE::operator=(const IMAGE& img)
{
inittest(L"IMAGE::operator=");
this->copyimage(&img);
return *this;
}
void IMAGE::copyimage(PCIMAGE pSrcImg)
{
inittest(L"IMAGE::copyimage");
PCIMAGE img = CONVERT_IMAGE_CONST(pSrcImg);
this->getimage(img, 0, 0, img->getwidth(), img->getheight());
CONVERT_IMAGE_END;
}
int IMAGE::getimage(PCIMAGE pSrcImg, int xSrc, int ySrc, int srcWidth, int srcHeight)
{
inittest(L"IMAGE::getimage");
PCIMAGE img = CONVERT_IMAGE_CONST(pSrcImg);
this->resize_f(srcWidth, srcHeight);
BitBlt(this->m_hDC, 0, 0, srcWidth, srcHeight, img->m_hDC, xSrc, ySrc, SRCCOPY);
CONVERT_IMAGE_END;
return grOk;
}
int IMAGE::getimage(int xSrc, int ySrc, int srcWidth, int srcHeight)
{
PIMAGE img = CONVERT_IMAGE_CONST(0);
this->getimage(img, xSrc, ySrc, srcWidth, srcHeight);
CONVERT_IMAGE_END;
return grOk;
}
void IMAGE::putimage(
PIMAGE imgDest, int xDest, int yDest, int widthDest, int heightDest, int xSrc, int ySrc, DWORD dwRop) const
{
inittest(L"IMAGE::putimage");
PIMAGE img = CONVERT_IMAGE(imgDest);
BitBlt(img->m_hDC, xDest, yDest, widthDest, heightDest, m_hDC, xSrc, ySrc, dwRop);
CONVERT_IMAGE_END;
}
void IMAGE::putimage(PIMAGE imgDest, int xDest, int yDest, DWORD dwRop) const
{
this->putimage(imgDest, xDest, yDest, m_width, m_height, 0, 0, dwRop);
}
void IMAGE::putimage(int xDest, int yDest, int widthDest, int heightDest, int xSrc, int ySrc, DWORD dwRop) const
{
PIMAGE img = CONVERT_IMAGE(0);
this->putimage(img, xDest, yDest, widthDest, heightDest, xSrc, ySrc, dwRop);
CONVERT_IMAGE_END;
}
void IMAGE::putimage(int xDest, int yDest, DWORD dwRop) const
{
PIMAGE img = CONVERT_IMAGE(0);
this->putimage(img, xDest, yDest, dwRop);
CONVERT_IMAGE_END;
}
int IMAGE::getimage(const char* filename, int zoomWidth, int zoomHeight)
{
const std::wstring& filename_w = mb2w(filename);
return getimage(filename_w.c_str(), zoomWidth, zoomHeight);
}
int getimage_from_bitmap(PIMAGE pimg, Gdiplus::Bitmap& bitmap)
{
// 将图像尺寸调整至和 bitmap 一致
int width = bitmap.GetWidth();
int height = bitmap.GetHeight();
resize_f(pimg, width, height);
// 设置外部缓冲区属性，指向图像缓冲区首地址
Gdiplus::BitmapData bitmapData;
bitmapData.Width = width;
bitmapData.Height = height;
bitmapData.Stride = width * sizeof(color_t); // 至下一行像素的偏移量(字节)
bitmapData.PixelFormat = PixelFormat32bppARGB; // 像素颜色格式: 32 位 ARGB
bitmapData.Scan0 = getbuffer(pimg); // 图像首行像素的首地址
// 读取区域设置为整个图像
Gdiplus::Rect rect(0, 0, width, height);
// 模式: 仅读取图像数据, 缓冲区由用户分配
int imageLockMode = Gdiplus::ImageLockModeRead | Gdiplus::ImageLockModeUserInputBuf;
//读取 Bitmap 图像内容，以 32 位 ARGB 的像素格式写入缓冲区
bitmap.LockBits(&rect, imageLockMode, PixelFormat32bppARGB, &bitmapData);
// 解除锁定(如果设置了 ImageLockModeWrite 模式，还会将缓冲区内容复制到 Bitmap)
bitmap.UnlockBits(&bitmapData);
return grOk;
}
int IMAGE::getimage(const wchar_t* filename, int zoomWidth, int zoomHeight)
{
(void)zoomWidth, (void)zoomHeight; // ignore
inittest(L"IMAGE::getimage");
{
int ret = getimage_pngfile(this, filename);
// grIOerror means it's not a png file
if (ret != grIOerror) {
return ret;
}
}
OLECHAR wszPath[MAX_PATH * 2 + 1];
WCHAR szPath[MAX_PATH * 2 + 1] = L"";
if (wcsstr(filename, L"http://")) {
lstrcpyW(szPath, filename);
} else if (filename[1] == ':') {
lstrcpyW(szPath, filename);
} else {
GetCurrentDirectoryW(MAX_PATH * 2, szPath);
lstrcatW(szPath, L"\\");
lstrcatW(szPath, filename);
}
lstrcpyW(wszPath, szPath);
Gdiplus::Bitmap bitmap(wszPath);
if (bitmap.GetLastStatus() != Gdiplus::Ok) {
return grIOerror;
}
getimage_from_bitmap(this, bitmap);
if (bitmap.GetLastStatus() != Gdiplus::Ok) {
return grError;
}
return grOk;
}
int IMAGE::saveimage(const char* filename, bool withAlphaChannel) const
{
return saveimage(mb2w(filename).c_str(), withAlphaChannel);
}
int IMAGE::saveimage(const wchar_t* filename, bool withAlphaChannel) const
{
return ege::saveimage(this, filename, withAlphaChannel);
}
void getimage_from_png_struct(PIMAGE self, void* vpng_ptr, void* vinfo_ptr)
{
png_structp png_ptr = (png_structp)vpng_ptr;
png_infop info_ptr = (png_infop)vinfo_ptr;
#if defined(PNG_SKIP_sRGB_CHECK_PROFILE) && defined(PNG_SET_OPTION_SUPPORTED)
png_set_option(png_ptr, PNG_SKIP_sRGB_CHECK_PROFILE,
PNG_OPTION_ON);
#endif
// 读取 PNG 文件信息, 存入 info_ptr 中
png_read_info(png_ptr, info_ptr);
const png_byte color_type = png_get_color_type(png_ptr, info_ptr);
const png_byte bit_depth = png_get_bit_depth(png_ptr, info_ptr); // 每通道位深度
// 将颜色类型转为 RGB 或 RGBA
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_palette_to_rgb(png_ptr);
} else if ((color_type == PNG_COLOR_TYPE_GRAY) && (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)) {
png_set_gray_to_rgb(png_ptr);
}
// 将位深度设置为每通道 8 bit
// (PNG 格式规定，RGB(RGBA) 位深度为 8 或 16，不会低于 8)
if (bit_depth == 16) {
png_set_strip_16(png_ptr); // bit depth 16 to 8
}
// 补齐 alpha 通道
if ((color_type != PNG_COLOR_TYPE_RGB_ALPHA) && (color_type != PNG_COLOR_TYPE_GRAY_ALPHA)) {
// 若在 tRNS 块中存在透明度信息则将其转为 alpha 通道
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
png_set_tRNS_to_alpha(png_ptr);
} else {
// 添加 alpha 通道(最高字节)并以 0xFF 填充
png_set_add_alpha(png_ptr, 0xFF, PNG_FILLER_AFTER);
}
}
// 调整通道存储顺序，字节从低到高依次为 B, G, R, A
png_set_bgr(png_ptr);
// 根据以上设置的目标格式更新 png_info 结构
png_read_update_info(png_ptr, info_ptr);
// 经过以上设置，像素格式为 ARGB (字节顺序从低至高依次为 B, G, R, A), 位深度为 8 (每通道)
const png_uint_32 width = png_get_image_width(png_ptr, info_ptr);
const png_uint_32 height = png_get_image_height(png_ptr, info_ptr);
// 将图像宽高调整至与 PNG 图片一致
self->resize_f((int)width, (int)height);
// 创建 png_bytep 数组，指向图像缓冲区中每一行像素的首地址
const png_bytepp row_pointers = new png_bytep[height];
color_t* buffer = (color_t*)self->m_pBuffer;
for (png_uint_32 i = 0; i < height; i++) {
row_pointers[i] = (png_bytep)(&buffer[i * width]);
}
// 读取图像数据，存入 row_pointers 所指向的内存区域
png_read_image(png_ptr, row_pointers);
delete[] row_pointers;
}
int IMAGE::getpngimg(FILE* fp)
{
png_structp png_ptr;
png_infop info_ptr;
{
char header[16];
uint32_t number = 8;
fread(header, 1, number, fp);
int isn_png = png_sig_cmp((png_const_bytep)header, 0, number);
if (isn_png) {
return grIOerror;
}
fseek(fp, 0, SEEK_SET);
}
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
return grAllocError;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return grAllocError;
}
png_init_io(png_ptr, fp);
getimage_from_png_struct(this, png_ptr, info_ptr);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return grOk;
}
int IMAGE::savepngimg(FILE* fp, bool withAlphaChannel) const
{
unsigned long i, j;
png_structp png_ptr;
png_infop info_ptr;
png_colorp palette;
png_byte* image;
png_bytep* row_pointers;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
uint32_t pixelsize = withAlphaChannel ? 4 : 3;
uint32_t width = m_width, height = m_height;
if (png_ptr == NULL) {
return -1;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_write_struct(&png_ptr, NULL);
return -1;
}
/*if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
return -1;
}// */
png_init_io(png_ptr, fp);
png_set_IHDR(png_ptr, info_ptr, width, height, 8, withAlphaChannel ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH * sizeof(png_color));
png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
image = (png_byte*)malloc(width * height * pixelsize * sizeof(png_byte) + 4);
if (image == NULL) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return -1;
}
row_pointers = (png_bytep*)malloc(height * sizeof(png_bytep));
if (row_pointers == NULL) {
png_destroy_write_struct(&png_ptr, &info_ptr);
free(image);
image = NULL;
return -1;
}
for (i = 0; i < height; i++) {
for (j = 0; j < width; ++j) {
(DWORD&)image[(i * width + j) * pixelsize] = RGBTOBGR(m_pBuffer[i * width + j]);
}
row_pointers[i] = (png_bytep)image + i * width * pixelsize;
}
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
png_free(png_ptr, palette);
palette = NULL;
png_destroy_write_struct(&png_ptr, &info_ptr);
free(row_pointers);
row_pointers = NULL;
free(image);
image = NULL;
return 0;
}
struct MemCursor
{
png_const_bytep data;
png_size_t size;
png_size_t cur;
};
static void read_data_from_MemCursor(png_structp png_ptr, png_bytep outBytes, png_size_t byteCountToRead)
{
MemCursor& cursor = *(MemCursor*)png_get_io_ptr(png_ptr);
png_size_t count = MIN(cursor.size - cursor.cur, byteCountToRead);
memcpy(outBytes, cursor.data + cursor.cur, count);
cursor.cur += count;
}
inline int getimage_from_resource(PIMAGE self, HRSRC hrsrc)
{
if (hrsrc) {
HGLOBAL hg = LoadResource(0, hrsrc);
DWORD dwSize = SizeofResource(0, hrsrc);
LPVOID pvRes = LockResource(hg);
if (dwSize >= 8 && png_check_sig((png_const_bytep)pvRes, 8)) {
png_structp png_ptr;
png_infop info_ptr;
MemCursor cursor;
cursor.data = (png_const_bytep)pvRes;
cursor.size = dwSize;
cursor.cur = 0;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (png_ptr == NULL) {
return grAllocError;
}
info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct(&png_ptr, NULL, NULL);
return grAllocError;
}
png_set_read_fn(png_ptr, &cursor, read_data_from_MemCursor);
getimage_from_png_struct(self, png_ptr, info_ptr);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
} else {
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwSize);
LPVOID pvData;
IStream* pStm;
if (hGlobal == NULL || (pvData = GlobalLock(hGlobal)) == NULL) {
return grAllocError;
}
memcpy(pvData, pvRes, dwSize);
GlobalUnlock(hGlobal);
if (S_OK != dll::CreateStreamOnHGlobal(hGlobal, TRUE, &pStm)) {
return grNullPointer;
}
Gdiplus::Bitmap bitmap(pStm);
int status = bitmap.GetLastStatus();
if (status != Gdiplus::Ok) {
return grError;
}
getimage_from_bitmap(self, bitmap);
// GlobalFree 不能在 Bitmap 读取完成之前调用
// 否则 Bitmap::LockBits() 返回 Win32Error 错误码
GlobalFree(hGlobal);
}
return grOk;
}
return grIOerror;
}
int IMAGE::getimage(const char* resType, const char* resName, int zoomWidth, int zoomHeight)
{
const std::wstring& pResType_w = mb2w(resType);
const std::wstring& pResName_w = mb2w(resName);
return getimage(pResType_w.c_str(), pResName_w.c_str(), zoomWidth, zoomHeight);
}
int IMAGE::getimage(const wchar_t* resType, const wchar_t* resName, int zoomWidth, int zoomHeight)
{
(void)zoomWidth, (void)zoomHeight; // ignore
inittest(L"IMAGE::getimage");
struct _graph_setting* pg = &graph_setting;
HRSRC hrsrc = FindResourceW(pg->instance, resName, resType);
return getimage_from_resource(this, hrsrc);
}
int IMAGE::getimage(void* pMem, long size)
{
inittest(L"IMAGE::getimage");
if (pMem) {
DWORD dwSize = size;
HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, dwSize);
LPVOID pvData;
IStream* pStm;
if (hGlobal == NULL || (pvData = GlobalLock(hGlobal)) == NULL) {
return grAllocError;
}
memcpy(pvData, pMem, dwSize);
GlobalUnlock(hGlobal);
if (S_OK != dll::CreateStreamOnHGlobal(hGlobal, TRUE, &pStm)) {
return grNullPointer;
}
Gdiplus::Bitmap bitmap(pStm);
if (bitmap.GetLastStatus() != Gdiplus::Ok) {
return grError;
}
getimage_from_bitmap(this, bitmap);
// GlobalFree 不能在 Bitmap 读取完成之前调用
// 否则 Bitmap::LockBits() 返回 Win32Error 错误码
GlobalFree(hGlobal);
return grOk;
}
return grIOerror;
}
void IMAGE::putimage(PIMAGE imgDest, int xDest, int yDest, int widthDest, int heightDest, int xSrc, int ySrc, int srcWidth,
int srcHeight, DWORD dwRop) const
{
inittest(L"IMAGE::putimage");
const PCIMAGE img = CONVERT_IMAGE(imgDest);
if (img) {
SetStretchBltMode(img->m_hDC, COLORONCOLOR);
StretchBlt(img->m_hDC, xDest, yDest, widthDest, heightDest, m_hDC, xSrc, ySrc, srcWidth, srcHeight, dwRop);
}
CONVERT_IMAGE_END;
}
static void fix_rect_1size(PCIMAGE imgDest, PCIMAGE imgSrc, int* xDest, int* yDest,
int* xSrc, int* ySrc, int* width, int* height)
{
viewporttype vpt = imgDest->m_vpt;
Point srcPos(*xSrc, *ySrc);
Point dstPos(*xDest + vpt.left, *yDest + vpt.top);
/* 区域位于图像右下角，此区域内无内容 */
if ( (srcPos.x >= imgSrc->m_width) || (srcPos.y >= imgSrc->m_height)
|| (dstPos.x >= imgDest->m_width) || (dstPos.y >= imgDest->m_height))
{
*width = *height = 0;
return;
}
Bound srcBound;
srcBound.setTopLeft(*xSrc, *ySrc);
/* 调整区域: 宽高参数 <= 0 则将区域扩展至图像右下边缘，否则截断在 int 范围内*/
(*width <= 0) ? srcBound.setRight(imgSrc->m_width) : (void)srcBound.setLargeWidth(*width);
(*height <= 0) ? srcBound.setBottom(imgSrc->m_height) : (void)srcBound.setLargeHeight(*height);
/* 绘制区域 */
Bound dstBound;
dstBound.setTopLeft(dstPos);
dstBound.setLargeSize(srcBound.width(), srcBound.height());
/* 由视口区域计算绘制目标裁剪区域 */
Bound srcClip(0, 0, imgSrc->m_width, imgSrc->m_height);
Bound dstClip(0, 0, imgDest->m_width, imgDest->m_height);
dstClip.intersect(Bound(vpt.left, vpt.top, vpt.right, vpt.bottom));
srcBound.intersect(srcClip);
dstBound.intersect(dstClip);
Rect srcRect(srcBound);
Rect dstRect(dstBound);
/* 由共同区域求实际绘制区域 */
Point srcOffset(INT_MIN - srcPos.x, INT_MIN - srcPos.y);
Point dstOffset(INT_MIN - dstPos.x, INT_MIN - dstPos.y);
srcRect.offset(srcOffset.x, srcOffset.y);
dstRect.offset(dstOffset.x, dstOffset.y);
Rect actualRect = intersect(srcRect, dstRect);
if (actualRect.isValid()) {
*xDest = actualRect.x - dstOffset.x;
*yDest = actualRect.y - dstOffset.y;
*xSrc = actualRect.x - srcOffset.x;
*ySrc = actualRect.y - srcOffset.y;
*width = actualRect.width;
*height = actualRect.height;
} else {
*width = *height = 0;
}
}
int IMAGE::putimage_transparent(PIMAGE imgDest, // handle to dest
int xDest, // x-coord of destination upper-left corner
int yDest, // y-coord of destination upper-left corner
color_t transparentColor, // color to make transparent
int xSrc, // x-coord of source upper-left corner
int ySrc, // y-coord of source upper-left corner
int widthSrc, // width of source rectangle
int heightSrc // height of source rectangle
) const
{
inittest(L"IMAGE::putimage_transparent");
const PIMAGE img = CONVERT_IMAGE(imgDest);
if (img) {
PCIMAGE imgSrc = this;
int y, x;
DWORD ddx, dsx;
DWORD * pdp, *psp, cr;
// fix rect
fix_rect_1size(img, imgSrc, &xDest, &yDest, &xSrc, &ySrc, &widthSrc, &heightSrc);
if ((widthSrc == 0) || (heightSrc == 0))
return grOk;
// draw
pdp = img->m_pBuffer + yDest * img->m_width + xDest;
psp = imgSrc->m_pBuffer + ySrc * imgSrc->m_width + xSrc;
ddx = img->m_width - widthSrc;
dsx = imgSrc->m_width - widthSrc;
cr = transparentColor & 0x00FFFFFF;
for (y = 0; y < heightSrc; ++y) {
for (x = 0; x < widthSrc; ++x, ++psp, ++pdp) {
if ((*psp & 0x00FFFFFF) != cr) {
*pdp = EGECOLORA(*psp, EGEGET_A(*pdp));
}
}
pdp += ddx;
psp += dsx;
}
}
CONVERT_IMAGE_END;
return grOk;
}
int IMAGE::putimage_alphablend(PIMAGE imgDest, // handle to dest
int xDest, // x-coord of destination upper-left corner
int yDest, // y-coord of destination upper-left corner
unsigned char alpha, // alpha
int xSrc, // x-coord of source upper-left corner
int ySrc, // y-coord of source upper-left corner
int widthSrc, // width of source rectangle
int heightSrc,// height of source rectangle
alpha_type alphaType // alpha mode(straight alpha or premultiplied alpha)
) const
{
inittest(L"IMAGE::putimage_alphablend");
const PIMAGE img = CONVERT_IMAGE(imgDest);
if (img) {
if (alpha == 0)
return grOk;
PCIMAGE imgSrc = this;
fix_rect_1size(img, imgSrc, &xDest, &yDest, &xSrc, &ySrc, &widthSrc, &heightSrc);
if ((widthSrc == 0) || (heightSrc == 0))
return grOk;
if (alphaType == ALPHATYPE_PREMULTIPLIED) {
BLENDFUNCTION bf;
bf.BlendOp = AC_SRC_OVER;
bf.BlendFlags = 0;
bf.SourceConstantAlpha = alpha;
bf.AlphaFormat = AC_SRC_ALPHA;
// draw
dll::AlphaBlend(img->m_hDC, xDest, yDest, widthSrc, heightSrc,
imgSrc->m_hDC, xSrc, ySrc, widthSrc, heightSrc, bf);
} else {
DWORD* pdp = img->m_pBuffer + yDest * img->m_width + xDest;
DWORD* psp = imgSrc->m_pBuffer + ySrc * imgSrc->m_width + xSrc;
DWORD ddx = img->m_width - widthSrc;
DWORD dsx = imgSrc->m_width - widthSrc;
if (alpha == 0xFF) {
for (int y = 0; y < heightSrc; ++y) {
for (int x = 0; x < widthSrc; ++x, ++psp, ++pdp) {
DWORD d = *pdp, s = *psp;
*pdp = alphablend_inline(d, s);
}
pdp += ddx;
psp += dsx;
}
} else {
for (int y = 0; y < heightSrc; ++y) {
for (int x = 0; x < widthSrc; ++x, ++psp, ++pdp) {
DWORD d = *pdp, s = *psp;
*pdp = alphablend_inline(d, s, alpha);
}
pdp += ddx;
psp += dsx;
}
}
}