COMMON: Copy TransparentSurface from Wintermute engine to common code

1 files changed, 851 insertions, 0 deletions

diff --git a/graphics/transparent_surface.cpp b/graphics/transparent_surface.cpp
new file mode 100644
index 0000000000..c2d334e731
--- /dev/null
+++ b/graphics/transparent_surface.cpp
@@ -0,0 +1,851 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ *
+ * The bottom part of this is file is adapted from SDL_rotozoom.c. The
+ * relevant copyright notice for those specific functions can be found at the
+ * top of that section.
+ *
+ */
+
+
+
+#include "common/algorithm.h"
+#include "common/endian.h"
+#include "common/util.h"
+#include "common/rect.h"
+#include "common/math.h"
+#include "common/textconsole.h"
+#include "graphics/primitives.h"
+#include "graphics/transparent_surface.h"
+#include "graphics/transform_tools.h"
+
+//#define ENABLE_BILINEAR
+
+namespace Graphics {
+
+static const int kAShift = 0;//img->format.aShift;
+
+static const int kBModShift = 0;//img->format.bShift;
+static const int kGModShift = 8;//img->format.gShift;
+static const int kRModShift = 16;//img->format.rShift;
+static const int kAModShift = 24;//img->format.aShift;
+
+#ifdef SCUMM_LITTLE_ENDIAN
+static const int kAIndex = 0;
+static const int kBIndex = 1;
+static const int kGIndex = 2;
+static const int kRIndex = 3;
+
+#else
+static const int kAIndex = 3;
+static const int kBIndex = 2;
+static const int kGIndex = 1;
+static const int kRIndex = 0;
+#endif
+
+void doBlitOpaqueFast(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep);
+void doBlitBinaryFast(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep);
+void doBlitAlphaBlend(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep, uint32 color);
+void doBlitAdditiveBlend(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep, uint32 color);
+void doBlitSubtractiveBlend(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep, uint32 color);
+
+TransparentSurface::TransparentSurface() : Surface(), _alphaMode(ALPHA_FULL) {}
+
+TransparentSurface::TransparentSurface(const Surface &surf, bool copyData) : Surface(), _alphaMode(ALPHA_FULL) {
+	if (copyData) {
+		copyFrom(surf);
+	} else {
+		w = surf.w;
+		h = surf.h;
+		pitch = surf.pitch;
+		format = surf.format;
+		// We need to cast the const qualifier away here because 'pixels'
+		// always needs to be writable. 'surf' however is a constant Surface,
+		// thus getPixels will always return const pixel data.
+		pixels = const_cast<void *>(surf.getPixels());
+	}
+}
+
+/**
+ * Optimized version of doBlit to be used w/opaque blitting (no alpha).
+ */
+void doBlitOpaqueFast(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep) {
+
+	byte *in;
+	byte *out;
+
+	for (uint32 i = 0; i < height; i++) {
+		out = outo;
+		in = ino;
+		memcpy(out, in, width * 4);
+		for (uint32 j = 0; j < width; j++) {
+			out[kAIndex] = 0xFF;
+			out += 4;
+		}
+		outo += pitch;
+		ino += inoStep;
+	}
+}
+
+/**
+ * Optimized version of doBlit to be used w/binary blitting (blit or no-blit, no blending).
+ */
+void doBlitBinaryFast(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep) {
+
+	byte *in;
+	byte *out;
+
+	for (uint32 i = 0; i < height; i++) {
+		out = outo;
+		in = ino;
+		for (uint32 j = 0; j < width; j++) {
+			uint32 pix = *(uint32 *)in;
+			int a = (pix >> kAShift) & 0xff;
+
+			if (a != 0) {   // Full opacity (Any value not exactly 0 is Opaque here)
+				*(uint32 *)out = pix;
+				out[kAIndex] = 0xFF;
+			}
+			out += 4;
+			in += inStep;
+		}
+		outo += pitch;
+		ino += inoStep;
+	}
+}
+
+/**
+ * Optimized version of doBlit to be used with alpha blended blitting
+ * @param ino a pointer to the input surface
+ * @param outo a pointer to the output surface
+ * @param width width of the input surface
+ * @param height height of the input surface
+ * @param pitch pitch of the output surface - that is, width in bytes of every row, usually bpp * width of the TARGET surface (the area we are blitting to might be smaller, do the math)
+ * @inStep size in bytes to skip to address each pixel, usually bpp of the source surface
+ * @inoStep width in bytes of every row on the *input* surface / kind of like pitch
+ * @color colormod in 0xAARRGGBB format - 0xFFFFFFFF for no colormod
+ */
+void doBlitAlphaBlend(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep, uint32 color) {
+	byte *in;
+	byte *out;
+
+	if (color == 0xffffffff) {
+
+		for (uint32 i = 0; i < height; i++) {
+			out = outo;
+			in = ino;
+			for (uint32 j = 0; j < width; j++) {
+
+				if (in[kAIndex] != 0) {
+					out[kAIndex] = 255;
+					out[kRIndex] = ((in[kRIndex] * in[kAIndex]) + out[kRIndex] * (255 - in[kAIndex])) >> 8;
+					out[kGIndex] = ((in[kGIndex] * in[kAIndex]) + out[kGIndex] * (255 - in[kAIndex])) >> 8;
+					out[kBIndex] = ((in[kBIndex] * in[kAIndex]) + out[kBIndex] * (255 - in[kAIndex])) >> 8;
+				}
+
+				in += inStep;
+				out += 4;
+			}
+			outo += pitch;
+			ino += inoStep;
+		}
+	} else {
+
+		byte ca = (color >> kAModShift) & 0xFF;
+		byte cr = (color >> kRModShift) & 0xFF;
+		byte cg = (color >> kGModShift) & 0xFF;
+		byte cb = (color >> kBModShift) & 0xFF;
+
+		for (uint32 i = 0; i < height; i++) {
+			out = outo;
+			in = ino;
+			for (uint32 j = 0; j < width; j++) {
+
+				uint32 ina = in[kAIndex] * ca >> 8;
+				out[kAIndex] = 255;
+				out[kBIndex] = (out[kBIndex] * (255 - ina) >> 8);
+				out[kGIndex] = (out[kGIndex] * (255 - ina) >> 8);
+				out[kRIndex] = (out[kRIndex] * (255 - ina) >> 8);
+
+				out[kBIndex] = out[kBIndex] + (in[kBIndex] * ina * cb >> 16);
+				out[kGIndex] = out[kGIndex] + (in[kGIndex] * ina * cg >> 16);
+				out[kRIndex] = out[kRIndex] + (in[kRIndex] * ina * cr >> 16);
+
+				in += inStep;
+				out += 4;
+			}
+			outo += pitch;
+			ino += inoStep;
+		}
+	}
+}
+
+/**
+ * Optimized version of doBlit to be used with additive blended blitting
+ */
+void doBlitAdditiveBlend(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep, uint32 color) {
+	byte *in;
+	byte *out;
+
+	if (color == 0xffffffff) {
+
+		for (uint32 i = 0; i < height; i++) {
+			out = outo;
+			in = ino;
+			for (uint32 j = 0; j < width; j++) {
+
+				if (in[kAIndex] != 0) {
+					out[kRIndex] = MIN((in[kRIndex] * in[kAIndex] >> 8) + out[kRIndex], 255);
+					out[kGIndex] = MIN((in[kGIndex] * in[kAIndex] >> 8) + out[kGIndex], 255);
+					out[kBIndex] = MIN((in[kBIndex] * in[kAIndex] >> 8) + out[kBIndex], 255);
+				}
+
+				in += inStep;
+				out += 4;
+			}
+			outo += pitch;
+			ino += inoStep;
+		}
+	} else {
+
+		byte ca = (color >> kAModShift) & 0xFF;
+		byte cr = (color >> kRModShift) & 0xFF;
+		byte cg = (color >> kGModShift) & 0xFF;
+		byte cb = (color >> kBModShift) & 0xFF;
+
+		for (uint32 i = 0; i < height; i++) {
+			out = outo;
+			in = ino;
+			for (uint32 j = 0; j < width; j++) {
+
+				uint32 ina = in[kAIndex] * ca >> 8;
+
+				if (cb != 255) {
+					out[kBIndex] = MIN(out[kBIndex] + ((in[kBIndex] * cb * ina) >> 16), 255u);
+				} else {
+					out[kBIndex] = MIN(out[kBIndex] + (in[kBIndex] * ina >> 8), 255u);
+				}
+
+				if (cg != 255) {
+					out[kGIndex] = MIN(out[kGIndex] + ((in[kGIndex] * cg * ina) >> 16), 255u);
+				} else {
+					out[kGIndex] = MIN(out[kGIndex] + (in[kGIndex] * ina >> 8), 255u);
+				}
+
+				if (cr != 255) {
+					out[kRIndex] = MIN(out[kRIndex] + ((in[kRIndex] * cr * ina) >> 16), 255u);
+				} else {
+					out[kRIndex] = MIN(out[kRIndex] + (in[kRIndex] * ina >> 8), 255u);
+				}
+
+				in += inStep;
+				out += 4;
+			}
+			outo += pitch;
+			ino += inoStep;
+		}
+	}
+}
+
+/**
+ * Optimized version of doBlit to be used with subtractive blended blitting
+ */
+void doBlitSubtractiveBlend(byte *ino, byte *outo, uint32 width, uint32 height, uint32 pitch, int32 inStep, int32 inoStep, uint32 color) {
+	byte *in;
+	byte *out;
+
+	if (color == 0xffffffff) {
+
+		for (uint32 i = 0; i < height; i++) {
+			out = outo;
+			in = ino;
+			for (uint32 j = 0; j < width; j++) {
+
+				if (in[kAIndex] != 0) {
+					out[kRIndex] = MAX(out[kRIndex] - ((in[kRIndex] * out[kRIndex]) * in[kAIndex] >> 16), 0);
+					out[kGIndex] = MAX(out[kGIndex] - ((in[kGIndex] * out[kGIndex]) * in[kAIndex] >> 16), 0);
+					out[kBIndex] = MAX(out[kBIndex] - ((in[kBIndex] * out[kBIndex]) * in[kAIndex] >> 16), 0);
+				}
+
+				in += inStep;
+				out += 4;
+			}
+			outo += pitch;
+			ino += inoStep;
+		}
+	} else {
+
+		byte cr = (color >> kRModShift) & 0xFF;
+		byte cg = (color >> kGModShift) & 0xFF;
+		byte cb = (color >> kBModShift) & 0xFF;
+
+		for (uint32 i = 0; i < height; i++) {
+			out = outo;
+			in = ino;
+			for (uint32 j = 0; j < width; j++) {
+
+				out[kAIndex] = 255;
+				if (cb != 255) {
+					out[kBIndex] = MAX(out[kBIndex] - ((in[kBIndex] * cb  * (out[kBIndex]) * in[kAIndex]) >> 24), 0);
+				} else {
+					out[kBIndex] = MAX(out[kBIndex] - (in[kBIndex] * (out[kBIndex]) * in[kAIndex] >> 16), 0);
+				}
+
+				if (cg != 255) {
+					out[kGIndex] = MAX(out[kGIndex] - ((in[kGIndex] * cg  * (out[kGIndex]) * in[kAIndex]) >> 24), 0);
+				} else {
+					out[kGIndex] = MAX(out[kGIndex] - (in[kGIndex] * (out[kGIndex]) * in[kAIndex] >> 16), 0);
+				}
+
+				if (cr != 255) {
+					out[kRIndex] = MAX(out[kRIndex] - ((in[kRIndex] * cr * (out[kRIndex]) * in[kAIndex]) >> 24), 0);
+				} else {
+					out[kRIndex] = MAX(out[kRIndex] - (in[kRIndex] * (out[kRIndex]) * in[kAIndex] >> 16), 0);
+				}
+
+				in += inStep;
+				out += 4;
+			}
+			outo += pitch;
+			ino += inoStep;
+		}
+	}
+}
+
+Common::Rect TransparentSurface::blit(Graphics::Surface &target, int posX, int posY, int flipping, Common::Rect *pPartRect, uint color, int width, int height, TSpriteBlendMode blendMode) {
+
+	Common::Rect retSize;
+	retSize.top = 0;
+	retSize.left = 0;
+	retSize.setWidth(0);
+	retSize.setHeight(0);
+	// Check if we need to draw anything at all
+	int ca = (color >> 24) & 0xff;
+
+	if (ca == 0) {
+		return retSize;
+	}
+
+	// Create an encapsulating surface for the data
+	TransparentSurface srcImage(*this, false);
+	// TODO: Is the data really in the screen format?
+	if (format.bytesPerPixel != 4) {
+		warning("TransparentSurface can only blit 32bpp images, but got %d", format.bytesPerPixel * 8);
+		return retSize;
+	}
+
+	if (pPartRect) {
+
+		int xOffset = pPartRect->left;
+		int yOffset = pPartRect->top;
+
+		if (flipping & FLIP_V) {
+			yOffset = srcImage.h - pPartRect->bottom;
+		}
+
+		if (flipping & FLIP_H) {
+			xOffset = srcImage.w - pPartRect->right;
+		}
+
+		srcImage.pixels = getBasePtr(xOffset, yOffset);
+		srcImage.w = pPartRect->width();
+		srcImage.h = pPartRect->height();
+
+		debug(6, "Blit(%d, %d, %d, [%d, %d, %d, %d], %08x, %d, %d)", posX, posY, flipping,
+			  pPartRect->left,  pPartRect->top, pPartRect->width(), pPartRect->height(), color, width, height);
+	} else {
+
+		debug(6, "Blit(%d, %d, %d, [%d, %d, %d, %d], %08x, %d, %d)", posX, posY, flipping, 0, 0,
+			  srcImage.w, srcImage.h, color, width, height);
+	}
+
+	if (width == -1) {
+		width = srcImage.w;
+	}
+	if (height == -1) {
+		height = srcImage.h;
+	}
+
+#ifdef SCALING_TESTING
+	// Hardcode scaling to 66% to test scaling
+	width = width * 2 / 3;
+	height = height * 2 / 3;
+#endif
+
+	Graphics::Surface *img = nullptr;
+	Graphics::Surface *imgScaled = nullptr;
+	byte *savedPixels = nullptr;
+	if ((width != srcImage.w) || (height != srcImage.h)) {
+		// Scale the image
+		img = imgScaled = srcImage.scale(width, height);
+		savedPixels = (byte *)img->getPixels();
+	} else {
+		img = &srcImage;
+	}
+
+	// Handle off-screen clipping
+	if (posY < 0) {
+		img->h = MAX(0, (int)img->h - -posY);
+		img->setPixels((byte *)img->getBasePtr(0, -posY));
+		posY = 0;
+	}
+
+	if (posX < 0) {
+		img->w = MAX(0, (int)img->w - -posX);
+		img->setPixels((byte *)img->getBasePtr(-posX, 0));
+		posX = 0;
+	}
+
+	img->w = CLIP((int)img->w, 0, (int)MAX((int)target.w - posX, 0));
+	img->h = CLIP((int)img->h, 0, (int)MAX((int)target.h - posY, 0));
+
+	if ((img->w > 0) && (img->h > 0)) {
+		int xp = 0, yp = 0;
+
+		int inStep = 4;
+		int inoStep = img->pitch;
+		if (flipping & FLIP_H) {
+			inStep = -inStep;
+			xp = img->w - 1;
+		}
+
+		if (flipping & FLIP_V) {
+			inoStep = -inoStep;
+			yp = img->h - 1;
+		}
+
+		byte *ino = (byte *)img->getBasePtr(xp, yp);
+		byte *outo = (byte *)target.getBasePtr(posX, posY);
+
+		if (color == 0xFFFFFFFF && blendMode == BLEND_NORMAL && _alphaMode == ALPHA_OPAQUE) {
+			doBlitOpaqueFast(ino, outo, img->w, img->h, target.pitch, inStep, inoStep);
+		} else if (color == 0xFFFFFFFF && blendMode == BLEND_NORMAL && _alphaMode == ALPHA_BINARY) {
+			doBlitBinaryFast(ino, outo, img->w, img->h, target.pitch, inStep, inoStep);
+		} else {
+			if (blendMode == BLEND_ADDITIVE) {
+				doBlitAdditiveBlend(ino, outo, img->w, img->h, target.pitch, inStep, inoStep, color);
+			} else if (blendMode == BLEND_SUBTRACTIVE) {
+				doBlitSubtractiveBlend(ino, outo, img->w, img->h, target.pitch, inStep, inoStep, color);
+			} else {
+				assert(blendMode == BLEND_NORMAL);
+				doBlitAlphaBlend(ino, outo, img->w, img->h, target.pitch, inStep, inoStep, color);
+			}
+		}
+
+	}
+
+	retSize.setWidth(img->w);
+	retSize.setHeight(img->h);
+
+	if (imgScaled) {
+		imgScaled->setPixels(savedPixels);
+		imgScaled->free();
+		delete imgScaled;
+	}
+
+	return retSize;
+}
+
+/**
+ * Writes a color key to the alpha channel of the surface
+ * @param rKey  the red component of the color key
+ * @param gKey  the green component of the color key
+ * @param bKey  the blue component of the color key
+ * @param overwriteAlpha if true, all other alpha will be set fully opaque
+ */
+void TransparentSurface::applyColorKey(uint8 rKey, uint8 gKey, uint8 bKey, bool overwriteAlpha) {
+	assert(format.bytesPerPixel == 4);
+	for (int i = 0; i < h; i++) {
+		for (int j = 0; j < w; j++) {
+			uint32 pix = ((uint32 *)pixels)[i * w + j];
+			uint8 r, g, b, a;
+			format.colorToARGB(pix, a, r, g, b);
+			if (r == rKey && g == gKey && b == bKey) {
+				a = 0;
+				((uint32 *)pixels)[i * w + j] = format.ARGBToColor(a, r, g, b);
+			} else if (overwriteAlpha) {
+				a = 255;
+				((uint32 *)pixels)[i * w + j] = format.ARGBToColor(a, r, g, b);
+			}
+		}
+	}
+}
+
+AlphaType TransparentSurface::getAlphaMode() const {
+	return _alphaMode;
+}
+
+void TransparentSurface::setAlphaMode(AlphaType mode) {
+	_alphaMode = mode;
+}
+
+
+
+
+
+
+/*
+
+The below two functions are adapted from SDL_rotozoom.c,
+taken from SDL_gfx-2.0.18.
+
+Its copyright notice:
+
+=============================================================================
+SDL_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces
+
+Copyright (C) 2001-2012  Andreas Schiffler
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software. If you use this software
+in a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+
+2. Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source
+distribution.
+
+Andreas Schiffler -- aschiffler at ferzkopp dot net
+=============================================================================
+
+
+The functions have been adapted for different structures and coordinate
+systems.
+
+*/
+
+
+
+
+
+TransparentSurface *TransparentSurface::rotoscale(const TransformStruct &transform) const {
+
+	assert(transform._angle != 0); // This would not be ideal; rotoscale() should never be called in conditional branches where angle = 0 anyway.
+
+	Common::Point newHotspot;
+	Common::Rect srcRect(0, 0, (int16)w, (int16)h);
+	Common::Rect rect = TransformTools::newRect(Common::Rect(srcRect), transform, &newHotspot);
+	Common::Rect dstRect(0, 0, (int16)(rect.right - rect.left), (int16)(rect.bottom - rect.top));
+
+	TransparentSurface *target = new TransparentSurface();
+	assert(format.bytesPerPixel == 4);
+
+	int srcW = w;
+	int srcH = h;
+	int dstW = dstRect.width();
+	int dstH = dstRect.height();
+
+	target->create((uint16)dstW, (uint16)dstH, this->format);
+
+	if (transform._zoom.x == 0 || transform._zoom.y == 0) {
+		return target;
+	}
+
+	uint32 invAngle = 360 - (transform._angle % 360);
+	float invCos = cos(invAngle * M_PI / 180.0);
+	float invSin = sin(invAngle * M_PI / 180.0);
+
+	struct tColorRGBA { byte r; byte g; byte b; byte a; };
+	int icosx = (int)(invCos * (65536.0f * kDefaultZoomX / transform._zoom.x));
+	int isinx = (int)(invSin * (65536.0f * kDefaultZoomX / transform._zoom.x));
+	int icosy = (int)(invCos * (65536.0f * kDefaultZoomY / transform._zoom.y));
+	int isiny = (int)(invSin * (65536.0f * kDefaultZoomY / transform._zoom.y));
+
+
+	bool flipx = false, flipy = false; // TODO: See mirroring comment in RenderTicket ctor
+
+	int xd = (srcRect.left + transform._hotspot.x) << 16;
+	int yd = (srcRect.top + transform._hotspot.y) << 16;
+	int cx = newHotspot.x;
+	int cy = newHotspot.y;
+
+	int ax = -icosx * cx;
+	int ay = -isiny * cx;
+	int sw = srcW - 1;
+	int sh = srcH - 1;
+
+	tColorRGBA *pc = (tColorRGBA*)target->getBasePtr(0, 0);
+
+	for (int y = 0; y < dstH; y++) {
+		int t = cy - y;
+		int sdx = ax + (isinx * t) + xd;
+		int sdy = ay - (icosy * t) + yd;
+		for (int x = 0; x < dstW; x++) {
+			int dx = (sdx >> 16);
+			int dy = (sdy >> 16);
+			if (flipx) {
+				dx = sw - dx;
+			}
+			if (flipy) {
+				dy = sh - dy;
+			}
+
+#ifdef ENABLE_BILINEAR
+			if ((dx > -1) && (dy > -1) && (dx < sw) && (dy < sh)) {
+				const tColorRGBA *sp = (const tColorRGBA *)getBasePtr(dx, dy);
+				tColorRGBA c00, c01, c10, c11, cswap;
+				c00 = *sp;
+				sp += 1;
+				c01 = *sp;
+				sp += (this->pitch / 4);
+				c11 = *sp;
+				sp -= 1;
+				c10 = *sp;
+				if (flipx) {
+					cswap = c00; c00=c01; c01=cswap;
+					cswap = c10; c10=c11; c11=cswap;
+				}
+				if (flipy) {
+					cswap = c00; c00=c10; c10=cswap;
+					cswap = c01; c01=c11; c11=cswap;
+				}
+				/*
+				* Interpolate colors
+				*/
+				int ex = (sdx & 0xffff);
+				int ey = (sdy & 0xffff);
+				int t1, t2;
+				t1 = ((((c01.r - c00.r) * ex) >> 16) + c00.r) & 0xff;
+				t2 = ((((c11.r - c10.r) * ex) >> 16) + c10.r) & 0xff;
+				pc->r = (((t2 - t1) * ey) >> 16) + t1;
+				t1 = ((((c01.g - c00.g) * ex) >> 16) + c00.g) & 0xff;
+				t2 = ((((c11.g - c10.g) * ex) >> 16) + c10.g) & 0xff;
+				pc->g = (((t2 - t1) * ey) >> 16) + t1;
+				t1 = ((((c01.b - c00.b) * ex) >> 16) + c00.b) & 0xff;
+				t2 = ((((c11.b - c10.b) * ex) >> 16) + c10.b) & 0xff;
+				pc->b = (((t2 - t1) * ey) >> 16) + t1;
+				t1 = ((((c01.a - c00.a) * ex) >> 16) + c00.a) & 0xff;
+				t2 = ((((c11.a - c10.a) * ex) >> 16) + c10.a) & 0xff;
+				pc->a = (((t2 - t1) * ey) >> 16) + t1;
+			}
+#else
+			if ((dx >= 0) && (dy >= 0) && (dx < srcW) && (dy < srcH)) {
+				const tColorRGBA *sp = (const tColorRGBA *)getBasePtr(dx, dy);
+				*pc = *sp;
+			}
+#endif
+			sdx += icosx;
+			sdy += isiny;
+			pc++;
+		}
+	}
+	return target;
+}
+
+TransparentSurface *TransparentSurface::scale(uint16 newWidth, uint16 newHeight) const {
+
+	Common::Rect srcRect(0, 0, (int16)w, (int16)h);
+	Common::Rect dstRect(0, 0, (int16)newWidth, (int16)newHeight);
+
+	TransparentSurface *target = new TransparentSurface();
+
+	assert(format.bytesPerPixel == 4);
+
+	int srcW = srcRect.width();
+	int srcH = srcRect.height();
+	int dstW = dstRect.width();
+	int dstH = dstRect.height();
+
+	target->create((uint16)dstW, (uint16)dstH, this->format);
+
+#ifdef ENABLE_BILINEAR
+
+	// NB: The actual order of these bytes may not be correct, but
+	// since all values are treated equal, that does not matter.
+	struct tColorRGBA { byte r; byte g; byte b; byte a; };
+
+	bool flipx = false, flipy = false; // TODO: See mirroring comment in RenderTicket ctor
+
+
+	int *sax = new int[dstW + 1];
+	int *say = new int[dstH + 1];
+	assert(sax && say);
+
+	/*
+	* Precalculate row increments
+	*/
+	int spixelw = (srcW - 1);
+	int spixelh = (srcH - 1);
+	int sx = (int) (65536.0f * (float) spixelw / (float) (dstW - 1));
+	int sy = (int) (65536.0f * (float) spixelh / (float) (dstH - 1));
+
+	/* Maximum scaled source size */
+	int ssx = (srcW << 16) - 1;
+	int ssy = (srcH << 16) - 1;
+
+	/* Precalculate horizontal row increments */
+	int csx = 0;
+	int *csax = sax;
+	for (int x = 0; x <= dstW; x++) {
+		*csax = csx;
+		csax++;
+		csx += sx;
+
+		/* Guard from overflows */
+		if (csx > ssx) {
+			csx = ssx;
+		}
+	}
+
+	/* Precalculate vertical row increments */
+	int csy = 0;
+	int *csay = say;
+	for (int y = 0; y <= dstH; y++) {
+		*csay = csy;
+		csay++;
+		csy += sy;
+
+		/* Guard from overflows */
+		if (csy > ssy) {
+			csy = ssy;
+		}
+	}
+
+	const tColorRGBA *sp = (const tColorRGBA *) getBasePtr(0, 0);
+	tColorRGBA *dp = (tColorRGBA *) target->getBasePtr(0, 0);
+	int spixelgap = srcW;
+
+	if (flipx) {
+		sp += spixelw;
+	}
+	if (flipy) {
+		sp += spixelgap * spixelh;
+	}
+
+	csay = say;
+	for (int y = 0; y < dstH; y++) {
+		const tColorRGBA *csp = sp;
+		csax = sax;
+		for (int x = 0; x < dstW; x++) {
+			/*
+			* Setup color source pointers
+			*/
+			int ex = (*csax & 0xffff);
+			int ey = (*csay & 0xffff);
+			int cx = (*csax >> 16);
+			int cy = (*csay >> 16);
+
+			const tColorRGBA *c00, *c01, *c10, *c11;
+			c00 = sp;
+			c01 = sp;
+			c10 = sp;
+			if (cy < spixelh) {
+				if (flipy) {
+					c10 -= spixelgap;
+				} else {
+					c10 += spixelgap;
+				}
+			}
+			c11 = c10;
+			if (cx < spixelw) {
+				if (flipx) {
+					c01--;
+					c11--;
+				} else {
+					c01++;
+					c11++;
+				}
+			}
+
+			/*
+			* Draw and interpolate colors
+			*/
+			int t1, t2;
+			t1 = ((((c01->r - c00->r) * ex) >> 16) + c00->r) & 0xff;
+			t2 = ((((c11->r - c10->r) * ex) >> 16) + c10->r) & 0xff;
+			dp->r = (((t2 - t1) * ey) >> 16) + t1;
+			t1 = ((((c01->g - c00->g) * ex) >> 16) + c00->g) & 0xff;
+			t2 = ((((c11->g - c10->g) * ex) >> 16) + c10->g) & 0xff;
+			dp->g = (((t2 - t1) * ey) >> 16) + t1;
+			t1 = ((((c01->b - c00->b) * ex) >> 16) + c00->b) & 0xff;
+			t2 = ((((c11->b - c10->b) * ex) >> 16) + c10->b) & 0xff;
+			dp->b = (((t2 - t1) * ey) >> 16) + t1;
+			t1 = ((((c01->a - c00->a) * ex) >> 16) + c00->a) & 0xff;
+			t2 = ((((c11->a - c10->a) * ex) >> 16) + c10->a) & 0xff;
+			dp->a = (((t2 - t1) * ey) >> 16) + t1;
+
+			/*
+			* Advance source pointer x
+			*/
+			int *salastx = csax;
+			csax++;
+			int sstepx = (*csax >> 16) - (*salastx >> 16);
+			if (flipx) {
+				sp -= sstepx;
+			} else {
+				sp += sstepx;
+			}
+
+			/*
+			* Advance destination pointer x
+			*/
+			dp++;
+		}
+		/*
+		* Advance source pointer y
+		*/
+		int *salasty = csay;
+		csay++;
+		int sstepy = (*csay >> 16) - (*salasty >> 16);
+		sstepy *= spixelgap;
+		if (flipy) {
+			sp = csp - sstepy;
+		} else {
+			sp = csp + sstepy;
+		}
+	}
+
+	delete[] sax;
+	delete[] say;
+
+#else
+
+	int *scaleCacheX = new int[dstW];
+	for (int x = 0; x < dstW; x++) {
+		scaleCacheX[x] = (x * srcW) / dstW;
+	}
+
+	for (int y = 0; y < dstH; y++) {
+		uint32 *destP = (uint32 *)target->getBasePtr(0, y);
+		const uint32 *srcP = (const uint32 *)getBasePtr(0, (y * srcH) / dstH);
+		for (int x = 0; x < dstW; x++) {
+			*destP++ = srcP[scaleCacheX[x]];
+		}
+	}
+	delete[] scaleCacheX;
+
+#endif
+
+	return target;
+
+}
+
+} // End of namespace Graphics