From 8ae17b481a8f0a0c7d78e975a32e9e6df055b8df Mon Sep 17 00:00:00 2001
From: Cameron Cawley
Date: Fri, 1 Mar 2019 00:15:43 +0000
Subject: IMAGE: Move bitmap writing code out of OpenGLGraphicsManager

---
 image/bmp.cpp | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 image/bmp.h   |  9 +++++++++
 2 files changed, 64 insertions(+)

(limited to 'image')

diff --git a/image/bmp.cpp b/image/bmp.cpp
index 28eb049035..ce2b099797 100644
--- a/image/bmp.cpp
+++ b/image/bmp.cpp
@@ -132,4 +132,59 @@ bool BitmapDecoder::loadStream(Common::SeekableReadStream &stream) {
 	return true;
 }
 
+bool writeBMP(Common::WriteStream &out, const Graphics::Surface &input, const bool bottomUp) {
+	const Graphics::PixelFormat requiredFormat_3byte(3, 8, 8, 8, 0, 0, 8, 16, 0);
+
+	Graphics::Surface *tmp = NULL;
+	const Graphics::Surface *surface;
+
+	if (input.format == requiredFormat_3byte) {
+		surface = &input;
+	} else {
+		surface = tmp = input.convertTo(requiredFormat_3byte);
+	}
+
+	int dstPitch = surface->w * 3;
+	int extraDataLength = (dstPitch % 4) ? 4 - (dstPitch % 4) : 0;
+	int padding = 0;
+
+	out.writeByte('B');
+	out.writeByte('M');
+	out.writeUint32LE(surface->h * dstPitch + 54);
+	out.writeUint32LE(0);
+	out.writeUint32LE(54);
+	out.writeUint32LE(40);
+	out.writeUint32LE(surface->w);
+	out.writeUint32LE(surface->h);
+	out.writeUint16LE(1);
+	out.writeUint16LE(24);
+	out.writeUint32LE(0);
+	out.writeUint32LE(0);
+	out.writeUint32LE(0);
+	out.writeUint32LE(0);
+	out.writeUint32LE(0);
+	out.writeUint32LE(0);
+
+
+	if (bottomUp) {
+		for (uint y = 0; y < surface->h; ++y) {
+			out.write((const void *)surface->getBasePtr(0, y), dstPitch);
+			out.write(&padding, extraDataLength);
+		}
+	} else {
+		for (uint y = surface->h; y-- > 0;) {
+			out.write((const void *)surface->getBasePtr(0, y), dstPitch);
+			out.write(&padding, extraDataLength);
+		}
+	}
+
+	// free tmp surface
+	if (tmp) {
+		tmp->free();
+		delete tmp;
+	}
+
+	return true;
+}
+
 } // End of namespace Image
diff --git a/image/bmp.h b/image/bmp.h
index b482cc674b..a23f1e0978 100644
--- a/image/bmp.h
+++ b/image/bmp.h
@@ -37,6 +37,7 @@
 
 namespace Common {
 class SeekableReadStream;
+class WriteStream;
 }
 
 namespace Graphics {
@@ -66,6 +67,14 @@ private:
 	uint16 _paletteColorCount;
 };
 
+/**
+ * Outputs an uncompressed BMP stream of the given input surface.
+ *
+ * @param bottomUp Flip the vertical axis so pixel data is drawn from the
+ * bottom up, instead of from the top down.
+ */
+bool writeBMP(Common::WriteStream &out, const Graphics::Surface &input, const bool bottomUp = false);
+
 } // End of namespace Image
 
 #endif
-- 
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