Add ege_setfont support for GDI+ font usage with floating-point sizes

demo/test_ege_setfont.cpp

@@ -0,0 +1,79 @@
+/*
+ * Test demo for ege_setfont function
+ * This demo demonstrates the use of floating-point font sizes with GDI+
+ * Font sizes are in pixels to match the existing setfont() behavior
+ */
+
+#include <graphics.h>
+#include <stdio.h>
+
+int main()
+{
+    // Initialize graphics window
+    initgraph(800, 600);
+    setbkcolor(WHITE);
+    cleardevice();
+
+    // Test 1: Basic ege_setfont with floating-point size
+    settextcolor(BLACK);
+    ege_setfont(24.5f, L"Arial");
+    ege_drawtext(L"24.5px Arial font (floating-point size)", 50.0f, 50.0f);
+
+    // Test 2: Different sizes to show precision
+    ege_setfont(12.0f, L"Times New Roman");
+    ege_drawtext(L"12.0px Times New Roman", 50.0f, 100.0f);
+
+    ege_setfont(12.5f, L"Times New Roman");
+    ege_drawtext(L"12.5px Times New Roman", 50.0f, 120.0f);
+
+    ege_setfont(13.0f, L"Times New Roman");
+    ege_drawtext(L"13.0px Times New Roman", 50.0f, 140.0f);
+
+    // Test 3: With font styles
+    ege_setfont(20.0f, L"Arial", Gdiplus::FontStyleBold);
+    ege_drawtext(L"20px Arial Bold", 50.0f, 200.0f);
+
+    ege_setfont(18.0f, L"Arial", Gdiplus::FontStyleItalic);
+    ege_drawtext(L"18px Arial Italic", 50.0f, 240.0f);
+
+    ege_setfont(16.0f, L"Arial", Gdiplus::FontStyleBold | Gdiplus::FontStyleItalic);
+    ege_drawtext(L"16px Arial Bold Italic", 50.0f, 280.0f);
+
+    ege_setfont(14.0f, L"Arial", Gdiplus::FontStyleUnderline);
+    ege_drawtext(L"14px Arial Underline", 50.0f, 320.0f);
+
+    // Test 4: Very precise sizes
+    ege_setfont(15.25f, L"Courier New");
+    ege_drawtext(L"15.25px Courier New (very precise)", 50.0f, 380.0f);
+
+    // Test 5: Chinese characters with floating-point size
+    ege_setfont(22.5f, L"SimSun");
+    ege_drawtext(L"22.5像素宋体 - 中文测试", 50.0f, 430.0f);
+
+    // Test 6: Compare with measuretext
+    float width, height;
+    const wchar_t* testText = L"Test measuretext with GDI+ Font";
+    ege_setfont(18.0f, L"Arial");
+    measuretext(testText, &width, &height);
+
+    const size_t INFO_BUFFER_SIZE = 256;
+    wchar_t info[INFO_BUFFER_SIZE];
+#if defined(_MSC_VER) && (_MSC_VER >= 1400)
+    swprintf_s(info, INFO_BUFFER_SIZE, L"Width: %.2f, Height: %.2f", width, height);
+#else
+    swprintf(info, INFO_BUFFER_SIZE, L"Width: %.2f, Height: %.2f", width, height);
+#endif
+    ege_drawtext(testText, 50.0f, 480.0f);
+    ege_setfont(12.0f, L"Arial");
+    ege_drawtext(info, 50.0f, 510.0f);
+
+    // Instructions
+    ege_setfont(14.0f, L"Arial");
+    settextcolor(BLUE);
+    ege_drawtext(L"Press any key to exit...", 50.0f, 550.0f);
+
+    // Wait for key press
+    getch();
+    closegraph();
+    return 0;
+}

include/ege.h

@@ -3996,6 +3996,56 @@ void EGEAPI setfont(const LOGFONTA *font, PIMAGE pimg = NULL);
 EGE_DEPRECATE(getfont, "Please use the 'getfont' function with the LOGFONTW* parameter instead.")
 void EGEAPI getfont(LOGFONTA *font, PCIMAGE pimg = NULL);
 
+/**
+ * @brief Set font for GDI+ text rendering with floating-point size
+ * @param size Font size (floating-point), measured in cell height pixels to match GDI setfont() behavior
+ * @param typeface Font family name
+ * @param pimg Target image pointer, NULL means current ege window
+ * @note This function creates a GDI+ Font directly, allowing floating-point font sizes.
+ *       When set, ege_drawtext will use this GDI+ font instead of converting from GDI HFONT.
+ *       The size represents the cell height (like GDI's LOGFONT.lfHeight). The implementation
+ *       adjusts this to GDI+'s em height internally to ensure the rendered size matches GDI fonts.
+ */
+void EGEAPI ege_setfont(float size, const char* typeface, PIMAGE pimg = NULL);
+
+/**
+ * @brief Set font for GDI+ text rendering with floating-point size (Unicode)
+ * @param size Font size (floating-point), measured in cell height pixels to match GDI setfont() behavior
+ * @param typeface Font family name
+ * @param pimg Target image pointer, NULL means current ege window
+ * @note This function creates a GDI+ Font directly, allowing floating-point font sizes.
+ *       When set, ege_drawtext will use this GDI+ font instead of converting from GDI HFONT.
+ *       The size represents the cell height (like GDI's LOGFONT.lfHeight). The implementation
+ *       adjusts this to GDI+'s em height internally to ensure the rendered size matches GDI fonts.
+ */
+void EGEAPI ege_setfont(float size, const wchar_t* typeface, PIMAGE pimg = NULL);
+
+/**
+ * @brief Set font for GDI+ text rendering with floating-point size and style
+ * @param size Font size (floating-point), measured in cell height pixels to match GDI setfont() behavior
+ * @param typeface Font family name
+ * @param style Font style (combination of Gdiplus::FontStyle flags: FontStyleBold, FontStyleItalic, etc.)
+ * @param pimg Target image pointer, NULL means current ege window
+ * @note This function creates a GDI+ Font directly, allowing floating-point font sizes and GDI+ font styles.
+ *       When set, ege_drawtext will use this GDI+ font instead of converting from GDI HFONT.
+ *       The size represents the cell height (like GDI's LOGFONT.lfHeight). The implementation
+ *       adjusts this to GDI+'s em height internally to ensure the rendered size matches GDI fonts.
+ */
+void EGEAPI ege_setfont(float size, const char* typeface, int style, PIMAGE pimg = NULL);
+
+/**
+ * @brief Set font for GDI+ text rendering with floating-point size and style (Unicode)
+ * @param size Font size (floating-point), measured in cell height pixels to match GDI setfont() behavior
+ * @param typeface Font family name
+ * @param style Font style (combination of Gdiplus::FontStyle flags: FontStyleBold, FontStyleItalic, etc.)
+ * @param pimg Target image pointer, NULL means current ege window
+ * @note This function creates a GDI+ Font directly, allowing floating-point font sizes and GDI+ font styles.
+ *       When set, ege_drawtext will use this GDI+ font instead of converting from GDI HFONT.
+ *       The size represents the cell height (like GDI's LOGFONT.lfHeight). The implementation
+ *       adjusts this to GDI+'s em height internally to ensure the rendered size matches GDI fonts.
+ */
+void EGEAPI ege_setfont(float size, const wchar_t* typeface, int style, PIMAGE pimg = NULL);
+
 /// @}
 
 #define getmaxx getwidth

include/ege.zh_CN.h

@@ -3991,6 +3991,56 @@ void EGEAPI setfont(const LOGFONTA *font, PIMAGE pimg = NULL);
 EGE_DEPRECATE(getfont, "Please use the 'getfont' function with the LOGFONTW* parameter instead.")
 void EGEAPI getfont(LOGFONTA *font, PCIMAGE pimg = NULL);
 
+/**
+ * @brief 设置用于GDI+文字渲染的浮点数大小字体
+ * @param size 字体大小（浮点数），以单元格高度像素为单位，与GDI setfont()行为保持一致
+ * @param typeface 字体名称
+ * @param pimg 目标图像指针，NULL 表示当前ege窗口
+ * @note 此函数直接创建GDI+ Font，允许使用浮点数字体大小。
+ *       设置后，ege_drawtext将使用此GDI+字体，而不是从GDI HFONT转换。
+ *       大小表示单元格高度（类似GDI的LOGFONT.lfHeight）。实现内部会将其调整为
+ *       GDI+的em高度，以确保渲染大小与GDI字体一致。
+ */
+void EGEAPI ege_setfont(float size, const char* typeface, PIMAGE pimg = NULL);
+
+/**
+ * @brief 设置用于GDI+文字渲染的浮点数大小字体（Unicode版本）
+ * @param size 字体大小（浮点数），以单元格高度像素为单位，与GDI setfont()行为保持一致
+ * @param typeface 字体名称
+ * @param pimg 目标图像指针，NULL 表示当前ege窗口
+ * @note 此函数直接创建GDI+ Font，允许使用浮点数字体大小。
+ *       设置后，ege_drawtext将使用此GDI+字体，而不是从GDI HFONT转换。
+ *       大小表示单元格高度（类似GDI的LOGFONT.lfHeight）。实现内部会将其调整为
+ *       GDI+的em高度，以确保渲染大小与GDI字体一致。
+ */
+void EGEAPI ege_setfont(float size, const wchar_t* typeface, PIMAGE pimg = NULL);
+
+/**
+ * @brief 设置用于GDI+文字渲染的浮点数大小和样式字体
+ * @param size 字体大小（浮点数），以单元格高度像素为单位，与GDI setfont()行为保持一致
+ * @param typeface 字体名称
+ * @param style 字体样式（Gdiplus::FontStyle标志的组合：FontStyleBold、FontStyleItalic等）
+ * @param pimg 目标图像指针，NULL 表示当前ege窗口
+ * @note 此函数直接创建GDI+ Font，允许使用浮点数字体大小和GDI+字体样式。
+ *       设置后，ege_drawtext将使用此GDI+字体，而不是从GDI HFONT转换。
+ *       大小表示单元格高度（类似GDI的LOGFONT.lfHeight）。实现内部会将其调整为
+ *       GDI+的em高度，以确保渲染大小与GDI字体一致。
+ */
+void EGEAPI ege_setfont(float size, const char* typeface, int style, PIMAGE pimg = NULL);
+
+/**
+ * @brief 设置用于GDI+文字渲染的浮点数大小和样式字体（Unicode版本）
+ * @param size 字体大小（浮点数），以单元格高度像素为单位，与GDI setfont()行为保持一致
+ * @param typeface 字体名称
+ * @param style 字体样式（Gdiplus::FontStyle标志的组合：FontStyleBold、FontStyleItalic等）
+ * @param pimg 目标图像指针，NULL 表示当前ege窗口
+ * @note 此函数直接创建GDI+ Font，允许使用浮点数字体大小和GDI+字体样式。
+ *       设置后，ege_drawtext将使用此GDI+字体，而不是从GDI HFONT转换。
+ *       大小表示单元格高度（类似GDI的LOGFONT.lfHeight）。实现内部会将其调整为
+ *       GDI+的em高度，以确保渲染大小与GDI字体一致。
+ */
+void EGEAPI ege_setfont(float size, const wchar_t* typeface, int style, PIMAGE pimg = NULL);
+
 /// @}
 
 #define getmaxx getwidth