image: Move image code into its own module.

[apitrace] / image / image_bmp.cpp

diff --git a/image/image_bmp.cpp b/image/image_bmp.cpp
new file mode 100644 (file)
index 0000000..e0c6428
--- /dev/null
+++ b/image/image_bmp.cpp
@@ -0,0 +1,139 @@
+/**************************************************************************
+ *
+ * Copyright 2011 Jose Fonseca
+ * Copyright 2008-2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+
+#include <assert.h>
+#include <stdint.h>
+
+#include "image.hpp"
+
+
+namespace image {
+
+
+#pragma pack(push,2)
+struct FileHeader {
+    uint16_t bfType;
+    uint32_t bfSize;
+    uint16_t bfReserved1;
+    uint16_t bfReserved2;
+    uint32_t bfOffBits;
+};
+#pragma pack(pop)
+
+struct InfoHeader {
+    uint32_t biSize;
+    int32_t biWidth;
+    int32_t biHeight;
+    uint16_t biPlanes;
+    uint16_t biBitCount;
+    uint32_t biCompression;
+    uint32_t biSizeImage;
+    int32_t biXPelsPerMeter;
+    int32_t biYPelsPerMeter;
+    uint32_t biClrUsed;
+    uint32_t biClrImportant;
+};
+
+struct Pixel {
+    uint8_t rgbBlue;
+    uint8_t rgbGreen;
+    uint8_t rgbRed;
+    uint8_t rgbAlpha;
+};
+
+
+bool
+Image::writeBMP(const char *filename) const {
+    assert(channels == 4);
+
+    struct FileHeader bmfh;
+    struct InfoHeader bmih;
+    unsigned x, y;
+
+    bmfh.bfType = 0x4d42;
+    bmfh.bfSize = 14 + 40 + height*width*4;
+    bmfh.bfReserved1 = 0;
+    bmfh.bfReserved2 = 0;
+    bmfh.bfOffBits = 14 + 40;
+
+    bmih.biSize = 40;
+    bmih.biWidth = width;
+    bmih.biHeight = height;
+    bmih.biPlanes = 1;
+    bmih.biBitCount = 32;
+    bmih.biCompression = 0;
+    bmih.biSizeImage = height*width*4;
+    bmih.biXPelsPerMeter = 0;
+    bmih.biYPelsPerMeter = 0;
+    bmih.biClrUsed = 0;
+    bmih.biClrImportant = 0;
+
+    std::ofstream stream(filename, std::ofstream::binary);
+
+    if (!stream) {
+        return false;
+    }
+
+    stream.write((const char *)&bmfh, 14);
+    stream.write((const char *)&bmih, 40);
+
+    unsigned stride = width*4;
+
+    if (flipped) {
+        for (y = 0; y < height; ++y) {
+            const unsigned char *ptr = pixels + y * stride;
+            for (x = 0; x < width; ++x) {
+                struct Pixel pixel;
+                pixel.rgbRed   = ptr[x*4 + 0];
+                pixel.rgbGreen = ptr[x*4 + 1];
+                pixel.rgbBlue  = ptr[x*4 + 2];
+                pixel.rgbAlpha = ptr[x*4 + 3];
+                stream.write((const char *)&pixel, 4);
+            }
+        }
+    } else {
+        y = height;
+        while (y--) {
+            const unsigned char *ptr = pixels + y * stride;
+            for (x = 0; x < width; ++x) {
+                struct Pixel pixel;
+                pixel.rgbRed   = ptr[x*4 + 0];
+                pixel.rgbGreen = ptr[x*4 + 1];
+                pixel.rgbBlue  = ptr[x*4 + 2];
+                pixel.rgbAlpha = ptr[x*4 + 3];
+                stream.write((const char *)&pixel, 4);
+            }
+        }
+    }
+
+    stream.close();
+
+    return true;
+}
+
+
+} /* namespace image */