SVNからのミラー

src/uw/image.cc

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+#include <X11/Xlib.h>
+#include <string>
+#define STB_IMAGE_IMPLEMENTATION
+#include "../dep/stb_image.hh"
+
+#include <stdexcept>
+
+#include "image.hh"
+
+namespace uw {
+  Image::Image(Screen &screen, const std::string imgPath) : uwScreen{ screen } {
+    if (imgPath.empty()) throw std::runtime_error("画像パスが空です。");
+
+    data = stbi_load(imgPath.c_str(), &width, &height, &chan, 4);
+    if (!data) throw std::runtime_error("画像の読み込みに失敗： " + imgPath);
+
+    imageExtent.width = width;
+    imageExtent.height = height;
+    imagePath = imgPath;
+
+    v = DefaultVisual(screen.getDisplay(), screen.getScreen());
+
+    createDepth();
+    createPixmap();
+    createImage();
+    createGC();
+  }
+
+  Image::~Image() {
+    if (gc) XFreeGC(uwScreen.getDisplay(), gc);
+    if (pm) XFreePixmap(uwScreen.getDisplay(), pm);
+    if (image) XFree(image);
+    if (data) stbi_image_free(data);
+  }
+
+  void Image::createDepth() {
+    depth = DefaultDepth(uwScreen.getDisplay(), uwScreen.getScreen());
+
+    if (depth != 24 && depth != 32) {
+      throw std::runtime_error(
+          "「" + std::to_string(depth) + "」の様な視覚の深さは未対応です。");
+    }
+
+    imageExtent.depth = depth;
+  }
+
+  void Image::createPixmap() {
+    pm = XCreatePixmap(uwScreen.getDisplay(), uwScreen.getWindow(), width, height,
+                       depth);
+  }
+
+  void Image::createImage() {
+    if (depth == 24) {
+      std::vector<uchar> cd(data, data + (width * height * 4));
+      cdata = cd;
+
+      for (int i = 0; i < width * height; i++) {
+        cdata[i * 4 + 0] = data[i * 4 + 2];
+        cdata[i * 4 + 1] = data[i * 4 + 1];
+        cdata[i * 4 + 2] = data[i * 4 + 0];
+        cdata[i * 4 + 3] = data[i * 4 + 3];
+      }
+
+      image = XCreateImage(uwScreen.getDisplay(), v, depth, ZPixmap, 0,
+          (char *)cdata.data(), width, height, 32, 0);
+    } else {
+      image = XCreateImage(uwScreen.getDisplay(), v, depth, ZPixmap, 0,
+          (char *)data, width, height, 32, 0);
+    }
+
+    if (!image) throw std::runtime_error("XImageの作成に失敗。");
+  }
+
+  void Image::createGC() {
+    gc = XCreateGC(uwScreen.getDisplay(), pm, 0, nullptr);
+    if (!gc) throw std::runtime_error("GCの作成に失敗。");
+  }
+}