cpp/openttd-patchpack/source Changeset - r6985:c27a9a2405aa

Changeset - r6985:c27a9a2405aa

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truelight - 17 years ago 2007-06-21 12:36:46
truelight@openttd.org

(svn r10241) -Codechange: CopyToBuffer now produces a buffer that is unreadable from outside the blitter, so the blitter can store anything he likes
-Codechange: added CopyImageToBuffer, which produces a readable buffer for screenshots
-Fix: 32bpp-anim now holds animation on transparent objects to avoid strange graphical effects
-Fix: 32bpp-anim now works correct on mouse-movement (it holds the palette animation correctly)

11 files changed with 156 insertions and 63 deletions:

src/blitter/32bpp_anim.cpp

src/blitter/32bpp_anim.hpp

src/blitter/32bpp_base.cpp

src/blitter/32bpp_base.hpp

src/blitter/8bpp_base.cpp

src/blitter/8bpp_base.hpp

src/blitter/base.hpp

src/blitter/null.hpp

src/gfx.cpp

src/screenshot.cpp

src/texteff.cpp

0 comments (0 inline, 0 general)

src/blitter/32bpp_anim.cpp

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@@ @@ -76,12 +76,49 @@ void Blitter_32bppAnim::Draw(Blitter::Bl @@
 			anim++;
 			src += ScaleByZoom(1, zoom);
+		}
+	}
+}
 void Blitter_32bppAnim::DrawColorMappingRect(void *dst, int width, int height, int pal)
+{
 	uint32 *udst = (uint32 *)dst;
 	uint8 *anim;
 	anim = this->anim_buf + ((uint32 *)dst - (uint32 *)_screen.dst_ptr);
 	if (pal == PALETTE_TO_TRANSPARENT) {
 		do {
 			for (int i = 0; i != width; i++) {
 				*udst = MakeTransparent(*udst, 60);
 				*anim = 0;
 				udst++;
 				anim++;
+			}
 			udst = udst - width + _screen.pitch;
 			anim = anim - width + this->anim_buf_width;
 		} while (--height);
 		return;
+	}
 	if (pal == PALETTE_TO_STRUCT_GREY) {
 		do {
 			for (int i = 0; i != width; i++) {
 				*udst = MakeGrey(*udst);
 				*anim = 0;
 				udst++;
 				anim++;
+			}
 			udst = udst - width + _screen.pitch;
 			anim = anim - width + this->anim_buf_width;
 		} while (--height);
 		return;
+	}
 	DEBUG(misc, 0, "32bpp blitter doesn't know how to draw this color table ('%d')", pal);
+}
 void Blitter_32bppAnim::SetPixel(void *video, int x, int y, uint8 color)
+{
 	*((uint32 *)video + x + y * _screen.pitch) = LookupColourInPalette(color);
 	/* Set the color in the anim-buffer too */
 	this->anim_buf[((uint32 *)video - (uint32 *)_screen.dst_ptr) + x + y * this->anim_buf_width] = color;
+}
@@ @@ -116,12 +153,55 @@ void Blitter_32bppAnim::DrawRect(void *v @@
+		}
 		video = (uint32 *)video + _screen.pitch;
 		anim_line += this->anim_buf_width;
 	} while (--height);
+}
 void Blitter_32bppAnim::CopyFromBuffer(void *video, const void *src, int width, int height)
+{
 	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
 	uint32 *dst = (uint32 *)video;
 	uint32 *usrc = (uint32 *)src;
 	uint8 *anim_line;
 	anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;
 	for (; height > 0; height--) {
 		memcpy(dst, usrc, width * sizeof(uint32));
 		usrc += width;
 		dst += _screen.pitch;
 		/* Copy back the anim-buffer */
 		memcpy(anim_line, usrc, width * sizeof(uint8));
 		usrc = (uint32 *)((uint8 *)usrc + width);
 		anim_line += this->anim_buf_width;
+	}
 	/* We update the palette (or the pixels that do animation) immediatly, to avoid graphical glitches */
 	this->PaletteAnimate(217, _use_dos_palette ? 38 : 28);
+}
 void Blitter_32bppAnim::CopyToBuffer(const void *video, void *dst, int width, int height)
+{
 	assert(video >= _screen.dst_ptr && video <= (uint32 *)_screen.dst_ptr + _screen.width + _screen.height * _screen.pitch);
 	uint32 *udst = (uint32 *)dst;
 	uint32 *src = (uint32 *)video;
 	uint8 *anim_line;
 	anim_line = ((uint32 *)video - (uint32 *)_screen.dst_ptr) + this->anim_buf;
 	for (; height > 0; height--) {
 		memcpy(udst, src, width * sizeof(uint32));
 		src += _screen.pitch;
 		udst += width;
 		/* Copy the anim-buffer */
 		memcpy(udst, anim_line, width * sizeof(uint8));
 		udst = (uint32 *)((uint8 *)udst + width);
 		anim_line += this->anim_buf_width;
+	}
+}
 void Blitter_32bppAnim::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
+{
 	uint8 *dst, *src;
 	/* We need to scroll the anim-buffer too */
 	if (scroll_y > 0) {

src/blitter/32bpp_anim.hpp

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Show inline comments

@@ @@ -19,15 +19,18 @@ public: @@
 		anim_buf(NULL),
 		anim_buf_width(0),
 		anim_buf_height(0)
 	{}
 	/* virtual */ void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom);
 	/* virtual */ void DrawColorMappingRect(void *dst, int width, int height, int pal);
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color);
 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color);
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color);
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
 	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
 	/* virtual */ void PaletteAnimate(uint start, uint count);
 	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
 };
 class FBlitter_32bppAnim: public BlitterFactory<FBlitter_32bppAnim> {

src/blitter/32bpp_base.cpp

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Show inline comments

@@ @@ -78,49 +78,46 @@ void Blitter_32bppBase::DrawLine(void *v @@
 			y += stepy;
 			frac += dx;
 			if (x > 0 && y > 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);
+		}
+	}
+}
 void Blitter_32bppBase::CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch)
 void Blitter_32bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
+{
 	int direction = (height < 0) ? -1 : 1;
 	uint32 *dst = (uint32 *)video;
 	uint32 *usrc = (uint32 *)src;
 	height = abs(height);
 	for (; height > 0; height--) {
 		memcpy(dst, usrc, width * sizeof(uint32));
 		usrc += src_pitch * direction;
 		dst += _screen.pitch * direction;
 		usrc += width;
 		dst += _screen.pitch;
+	}
+}
-void Blitter_32bppBase::CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
 void Blitter_32bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
+{
 	int direction = (height < 0) ? -1 : 1;
 	uint32 *udst = (uint32 *)dst;
 	uint32 *src = (uint32 *)video;
 	height = abs(height);
 	for (; height > 0; height--) {
 		memcpy(udst, src, width * sizeof(uint32));
 		src += _screen.pitch * direction;
 		udst += dst_pitch * direction;
 		src += _screen.pitch;
 		udst += width;
+	}
+}
-void Blitter_32bppBase::MoveBuffer(void *video_dst, const void *video_src, int width, int height)
+void Blitter_32bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
+{
 	uint32 *dst = (uint32 *)video_dst;
 	uint32 *src = (uint32 *)video_src;
 	uint32 *udst = (uint32 *)dst;
 	uint32 *src = (uint32 *)video;
 	for (; height > 0; height--) {
-		memmove(dst, src, width * sizeof(uint32));
+		memcpy(udst, src, width * sizeof(uint32));
 		src += _screen.pitch;
-		dst += _screen.pitch;
+		udst += dst_pitch;
+	}
+}
 void Blitter_32bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
+{
 	const uint32 *src;
@@ @@ -143,14 +140,17 @@ void Blitter_32bppBase::ScrollBuffer(voi @@
 			width -= scroll_x;
 		} else {
 			src -= scroll_x;
 			width += scroll_x;
+		}
 		/* Negative height as we want to copy from bottom to top */
 		this->CopyFromBuffer(dst, src, width, -height, _screen.pitch);
 		for (int h = height; h > 0; h--) {
 			memcpy(dst, src, width * sizeof(uint32));
 			src -= _screen.pitch;
 			dst -= _screen.pitch;
+		}
 	} else {
 		/* Calculate pointers */
 		dst = (uint32 *)video + left + top * _screen.pitch;
 		src = dst - scroll_y * _screen.pitch;
 		/* Decrese height. (scroll_y is <=0). */
@@ @@ -166,13 +166,17 @@ void Blitter_32bppBase::ScrollBuffer(voi @@
 			src -= scroll_x;
 			width += scroll_x;
+		}
 		/* the y-displacement may be 0 therefore we have to use memmove,
 		 * because source and destination may overlap */
 		this->MoveBuffer(dst, src, width, height);
 		for (int h = height; h > 0; h--) {
 			memmove(dst, src, width * sizeof(uint32));
 			src += _screen.pitch;
 			dst += _screen.pitch;
+		}
+	}
+}
 int Blitter_32bppBase::BufferSize(int width, int height)
+{
 	return width * height * sizeof(uint32);

src/blitter/32bpp_base.hpp

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@@ @@ -15,15 +15,15 @@ public: @@
 //	/* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);
 	/* virtual */ void *MoveTo(const void *video, int x, int y);
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color);
 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color);
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color);
 	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color);
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch);
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
 	/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height);
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
 	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
 	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
 	/* virtual */ int BufferSize(int width, int height);
 	/* virtual */ void PaletteAnimate(uint start, uint count);
 	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
 	/**

src/blitter/8bpp_base.cpp

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@@ @@ -83,49 +83,45 @@ void Blitter_8bppBase::DrawLine(void *vi @@
 			frac += dx;
 			if (x > 0 && y > 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, color);
+		}
+	}
+}
-void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch)
 void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
+{
 	int direction = (height < 0) ? -1 : 1;
 	uint8 *dst = (uint8 *)video;
 	uint8 *usrc = (uint8 *)src;
 	height = abs(height);
 	for (; height > 0; height--) {
 		memcpy(dst, usrc, width);
 		usrc += src_pitch * direction;
 		dst += _screen.pitch * direction;
 		memcpy(dst, usrc, width * sizeof(uint8));
 		usrc += width;
 		dst += _screen.pitch;
+	}
+}
-void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
 void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
+{
 	int direction = (height < 0) ? -1 : 1;
 	uint8 *udst = (uint8 *)dst;
 	uint8 *src = (uint8 *)video;
 	height = abs(height);
 	for (; height > 0; height--) {
 		memcpy(udst, src, width);
 		src += _screen.pitch * direction;
 		udst += dst_pitch * direction;
 		memcpy(udst, src, width * sizeof(uint8));
 		src += _screen.pitch;
 		udst += width;
+	}
+}
-void Blitter_8bppBase::MoveBuffer(void *video_dst, const void *video_src, int width, int height)
+void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
+{
 	uint8 *dst = (uint8 *)video_dst;
 	uint8 *src = (uint8 *)video_src;
 	uint8 *udst = (uint8 *)dst;
 	uint8 *src = (uint8 *)video;
 	for (; height > 0; height--) {
-		memmove(dst, src, width);
+		memcpy(udst, src, width * sizeof(uint8));
 		src += _screen.pitch;
-		dst += _screen.pitch;
+		udst += dst_pitch;
+	}
+}
 void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
+{
 	const uint8 *src;
@@ @@ -148,14 +144,17 @@ void Blitter_8bppBase::ScrollBuffer(void @@
 			width -= scroll_x;
 		} else {
 			src -= scroll_x;
 			width += scroll_x;
+		}
 		/* Negative height as we want to copy from bottom to top */
 		this->CopyFromBuffer(dst, src, width, -height, _screen.pitch);
 		for (int h = height; h > 0; h--) {
 			memcpy(dst, src, width * sizeof(uint8));
 			src -= _screen.pitch;
 			dst -= _screen.pitch;
+		}
 	} else {
 		/* Calculate pointers */
 		dst = (uint8 *)video + left + top * _screen.pitch;
 		src = dst - scroll_y * _screen.pitch;
 		/* Decrese height. (scroll_y is <=0). */
@@ @@ -171,13 +170,17 @@ void Blitter_8bppBase::ScrollBuffer(void @@
 			src -= scroll_x;
 			width += scroll_x;
+		}
 		/* the y-displacement may be 0 therefore we have to use memmove,
 		 * because source and destination may overlap */
 		this->MoveBuffer(dst, src, width, height);
 		for (int h = height; h > 0; h--) {
 			memmove(dst, src, width * sizeof(uint8));
 			src += _screen.pitch;
 			dst += _screen.pitch;
+		}
+	}
+}
 int Blitter_8bppBase::BufferSize(int width, int height)
+{
 	return width * height;

src/blitter/8bpp_base.hpp

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@@ @@ -15,15 +15,15 @@ public: @@
 //	/* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);
 	/* virtual */ void *MoveTo(const void *video, int x, int y);
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color);
 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color);
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color);
 	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color);
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch);
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
 	/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height);
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height);
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height);
 	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch);
 	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y);
 	/* virtual */ int BufferSize(int width, int height);
 	/* virtual */ void PaletteAnimate(uint start, uint count);
 	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation();
 };

src/blitter/base.hpp

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@@ @@ -118,34 +118,35 @@ public: @@
 	/**
 	 * Copy from a buffer to the screen.
 	 * @param video The destionation pointer (video-buffer).
 	 * @param src The buffer from which the data will be read.
 	 * @param width The width of the buffer.
 	 * @param height The height of the buffer.
-	 * @param src_pitch The pitch (byte per line) of the source buffer.
+	 * @note You can not do anything with the content of the buffer, as the blitter can store non-pixel data in it too!
 	 */
-	virtual void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch) = 0;
 	virtual void CopyFromBuffer(void *video, const void *src, int width, int height) = 0;
 	/**
 	 * Copy from the screen to a buffer.
 	 * @param video The destination pointer (video-buffer).
 	 * @param dst The buffer in which the data will be stored.
 	 * @param width The width of the buffer.
 	 * @param height The height of the buffer.
-	 * @param dst_pitch The pitch (byte per line) of the destination buffer.
+	 * @note You can not do anything with the content of the buffer, as the blitter can store non-pixel data in it too!
 	 */
-	virtual void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) = 0;
 	virtual void CopyToBuffer(const void *video, void *dst, int width, int height) = 0;
 	/**
 	 * Move the videobuffer some places (via memmove).
 	 * @param video_dst The destination pointer (video-buffer).
 	 * @param video_src The source pointer (video-buffer).
 	 * @param width The width of the buffer to move.
 	 * @param height The height of the buffer to move.
 	 * Copy from the screen to a buffer in a palette format for 8bpp and RGBA format for 32bpp.
 	 * @param video The destination pointer (video-buffer).
 	 * @param dst The buffer in which the data will be stored.
 	 * @param width The width of the buffer.
 	 * @param height The height of the buffer.
 	 * @param dst_pitch The pitch (byte per line) of the destination buffer.
 	 */
-	virtual void MoveBuffer(void *video_dst, const void *video_src, int width, int height) = 0;
+	virtual void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) = 0;
 	/**
 	 * Scroll the videobuffer some 'x' and 'y' value.
 	 * @param video The buffer to scroll into.
 	 * @param left The left value of the screen to scroll.
 	 * @param top The top value of the screen to scroll.

src/blitter/null.hpp

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@@ @@ -16,15 +16,15 @@ public: @@
 	/* virtual */ Sprite *Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator);
 	/* virtual */ void *MoveTo(const void *video, int x, int y) { return NULL; };
 	/* virtual */ void SetPixel(void *video, int x, int y, uint8 color) {};
 	/* virtual */ void SetPixelIfEmpty(void *video, int x, int y, uint8 color) {};
 	/* virtual */ void DrawRect(void *video, int width, int height, uint8 color) {};
 	/* virtual */ void DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 color) {};
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height, int src_pitch) {};
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) {};
 	/* virtual */ void MoveBuffer(void *video_dst, const void *video_src, int width, int height) {};
 	/* virtual */ void CopyFromBuffer(void *video, const void *src, int width, int height) {};
 	/* virtual */ void CopyToBuffer(const void *video, void *dst, int width, int height) {};
 	/* virtual */ void CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch) {};
 	/* virtual */ void ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y) {};
 	/* virtual */ int BufferSize(int width, int height) { return 0; };
 	/* virtual */ void PaletteAnimate(uint start, uint count) { };
 	/* virtual */ Blitter::PaletteAnimation UsePaletteAnimation() { return Blitter::PALETTE_ANIMATION_NONE; };
 };

src/gfx.cpp

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Show inline comments

@@ @@ -833,13 +833,13 @@ void ScreenSizeChanged() @@
 void UndrawMouseCursor()
+{
 	if (_cursor.visible) {
 		Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
 		_cursor.visible = false;
-		blitter->CopyFromBuffer(blitter->MoveTo(_screen.dst_ptr, _cursor.draw_pos.x, _cursor.draw_pos.y), _cursor_backup, _cursor.draw_size.x, _cursor.draw_size.y, _cursor.draw_size.x);
 		blitter->CopyFromBuffer(blitter->MoveTo(_screen.dst_ptr, _cursor.draw_pos.x, _cursor.draw_pos.y), _cursor_backup, _cursor.draw_size.x, _cursor.draw_size.y);
 		_video_driver->make_dirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);
+	}
+}
 void DrawMouseCursor()
+{
@@ @@ -880,13 +880,13 @@ void DrawMouseCursor() @@
 	_cursor.draw_pos.y = y;
 	_cursor.draw_size.y = h;
 	assert(blitter->BufferSize(w, h) < (int)sizeof(_cursor_backup));
 	/* Make backup of stuff below cursor */
-	blitter->CopyToBuffer(blitter->MoveTo(_screen.dst_ptr, _cursor.draw_pos.x, _cursor.draw_pos.y), _cursor_backup, _cursor.draw_size.x, _cursor.draw_size.y, _cursor.draw_size.x);
 	blitter->CopyToBuffer(blitter->MoveTo(_screen.dst_ptr, _cursor.draw_pos.x, _cursor.draw_pos.y), _cursor_backup, _cursor.draw_size.x, _cursor.draw_size.y);
 	/* Draw cursor on screen */
 	_cur_dpi = &_screen;
 	DrawSprite(_cursor.sprite, _cursor.pal, _cursor.pos.x, _cursor.pos.y);
 	_video_driver->make_dirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);

src/screenshot.cpp

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Show inline comments

@@ @@ -482,13 +482,13 @@ void SetScreenshotFormat(int i) @@
 /* screenshot generator that dumps the current video buffer */
 static void CurrentScreenCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
+{
 	Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
 	void *src = blitter->MoveTo(_screen.dst_ptr, 0, y);
-	blitter->CopyToBuffer(src, buf, _screen.width, n, pitch);
+	blitter->CopyImageToBuffer(src, buf, _screen.width, n, pitch);
+}
 /* generate a large piece of the world */
 static void LargeWorldCallback(void *userdata, void *buf, uint y, uint pitch, uint n)
+{
 	ViewPort *vp = (ViewPort *)userdata;

src/texteff.cpp

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Show inline comments

@@ @@ -52,13 +52,13 @@ TileIndex _animated_tile_list[MAX_ANIMAT @@
 static bool _textmessage_dirty = false;
 static bool _textmessage_visible = false;
 /* The chatbox grows from the bottom so the coordinates are pixels from
  * the left and pixels from the bottom. The height is the maximum height */
 static const Oblong _textmsg_box = {10, 30, 500, 150};
-static uint8 _textmessage_backup[150 * 500 * 4]; // (height * width)
+static uint8 _textmessage_backup[150 * 500 * 5]; // (height * width)
 static inline uint GetTextMessageCount()
+{
 	uint i;
 	for (i = 0; i < MAX_CHAT_MESSAGES; i++) {
@@ @@ -160,13 +160,13 @@ void UndrawTextMessage() @@
 			width = _screen.width - x;
+		}
 		if (width <= 0 || height <= 0) return;
 		_textmessage_visible = false;
 		/* Put our 'shot' back to the screen */
-		blitter->CopyFromBuffer(blitter->MoveTo(_screen.dst_ptr, x, y), _textmessage_backup, width, height, _textmsg_box.width);
 		blitter->CopyFromBuffer(blitter->MoveTo(_screen.dst_ptr, x, y), _textmessage_backup, width, height);
 		/* And make sure it is updated next time */
 		_video_driver->make_dirty(x, y, width, height);
 		_textmessage_dirty = true;
+	}
+}
@@ @@ -220,14 +220,16 @@ void DrawTextMessage() @@
+	}
 	if (x + width >= _screen.width) {
 		width = _screen.width - x;
+	}
 	if (width <= 0 || height <= 0) return;
 	assert(blitter->BufferSize(width, height) < (int)sizeof(_textmessage_backup));
 	/* Make a copy of the screen as it is before painting (for undraw) */
-	blitter->CopyToBuffer(blitter->MoveTo(_screen.dst_ptr, x, y), _textmessage_backup, width, height, _textmsg_box.width);
 	blitter->CopyToBuffer(blitter->MoveTo(_screen.dst_ptr, x, y), _textmessage_backup, width, height);
 	_cur_dpi = &_screen; // switch to _screen painting
 	/* Paint a half-transparent box behind the text messages */
 	GfxFillRect(
 			_textmsg_box.x,

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