added resizer

lib/danbooru_image_resizer/GIFReader.cpp

@@ -0,0 +1,58 @@
+#include <string.h>
+#include <gd.h>
+#include "GIFReader.h"
+#include "RowBuffer.h"
+#include "Resize.h"
+
+bool GIF::Read(FILE *f, Resizer *resizer, char error[1024])
+{
+	RowBuffer Rows;
+	bool Ret = false;
+	gdImage *image = gdImageCreateFromGif(f);
+
+	if(!image)
+	{
+		strcpy(error, "couldn't read GIF");
+		return false;
+	}
+
+	if(!Rows.Init(image->sx, image->sy, 3))
+	{
+		strcpy(error, "out of memory");
+		goto cleanup;
+	}
+
+	resizer->SetSource(image->sx, image->sy, 3);
+	for(int y = 0; y < image->sy; ++y)
+	{
+		uint8_t *p = Rows.GetRow(y);
+		if(p == NULL)
+		{
+			strcpy(error, "out of memory");
+			goto cleanup;
+		}
+
+		for(int x = 0; x < image->sx; ++x)
+		{
+			int c = gdImageGetTrueColorPixel(image, x, y);
+			(*p++) = gdTrueColorGetRed(c);
+			(*p++) = gdTrueColorGetGreen(c);
+			(*p++) = gdTrueColorGetBlue(c);
+		}
+
+		int DiscardRow;
+		if(!resizer->Run(Rows.GetRows(), Rows.GetStartRow(), Rows.GetEndRow(), DiscardRow))
+		{
+			strcpy(error, resizer->GetError());
+			goto cleanup;
+		}
+
+		Rows.DiscardRows(DiscardRow);
+	}
+
+	Ret = true;
+
+cleanup:
+	gdImageDestroy(image);
+	return Ret;
+}