C++ GfxSurface::create方法代码示例

/**
 * Translates a raw image resource into a graphics surface. The caller is then responsible
 * for managing and destroying the surface when done with it
 *
 * @imgData Raw image resource
 * @size Size of the resource
 */
GfxSurface surfaceFromRes(const byte *imgData) {
	Rect r(0, 0, READ_LE_UINT16(imgData), READ_LE_UINT16(imgData + 2));
	GfxSurface s;
	s.create(r.width(), r.height());
	s._centroid.x = READ_LE_UINT16(imgData + 4);
	s._centroid.y = READ_LE_UINT16(imgData + 6);
	s._transColor = *(imgData + 8);

	bool rleEncoded = (imgData[9] & 2) != 0;

	const byte *srcP = imgData + 10;
	Graphics::Surface destSurface = s.lockSurface();
	byte *destP = (byte *)destSurface.getBasePtr(0, 0);

	if (!rleEncoded) {
		Common::copy(srcP, srcP + (r.width() * r.height()), destP);
	} else {
		Common::set_to(destP, destP + (r.width() * r.height()), s._transColor);

		for (int yp = 0; yp < r.height(); ++yp) {
			int width = r.width();
			destP = (byte *)destSurface.getBasePtr(0, yp);

			while (width > 0) {
				uint8 controlVal = *srcP++;
				if ((controlVal & 0x80) == 0) {
					// Copy specified number of bytes

					Common::copy(srcP, srcP + controlVal, destP);
					width -= controlVal;
					srcP += controlVal;
					destP += controlVal;
				} else if ((controlVal & 0x40) == 0) {
					// Skip a specified number of output pixels
					destP += controlVal & 0x3f;
					width -= controlVal & 0x3f;
				} else {
					// Copy a specified pixel a given number of times
					controlVal &= 0x3f;
					int pixel = *srcP++;

					Common::set_to(destP, destP + controlVal, pixel);
					destP += controlVal;
					width -= controlVal;
				}
			}
			assert(width == 0);
		}
	}

	s.unlockSurface();
	return s;
}

/**
 * Scales a passed surface, creating a new surface with the result
 * @param srcImage		Source image to scale
 * @param NewWidth		New width for scaled image
 * @param NewHeight		New height for scaled image
 * @remarks Caller is responsible for freeing the returned surface
 */
static GfxSurface ResizeSurface(GfxSurface &src, int xSize, int ySize, int transIndex) {
	GfxSurface s;
	s.create(xSize, ySize);

	Graphics::Surface srcImage = src.lockSurface();
	Graphics::Surface destImage = s.lockSurface();

	int *horizUsage = scaleLine(xSize, srcImage.w);
	int *vertUsage = scaleLine(ySize, srcImage.h);

	// Loop to create scaled version
	for (int yp = 0; yp < ySize; ++yp) {
		byte *destP = (byte *)destImage.getBasePtr(0, yp);

		if (vertUsage[yp] == -1) {
			Common::set_to(destP, destP + xSize, transIndex);
		} else {
			const byte *srcP = (const byte *)srcImage.getBasePtr(0, vertUsage[yp]);

			for (int xp = 0; xp < xSize; ++xp) {
				if (horizUsage[xp] != -1) {
					const byte *tempSrcP = srcP + horizUsage[xp];
					*destP++ = *tempSrcP++;
				} else {
					// Pixel overrun at the end of the line
					*destP++ = transIndex;
				}
			}
		}
	}

	// Unlock surfaces
	src.unlockSurface();
	s.unlockSurface();

	// Delete arrays and return surface
	delete[] horizUsage;
	delete[] vertUsage;
	return s;
}

/**
 * Copys an area from one GfxSurface to another
 */
void GfxSurface::copyFrom(GfxSurface &src, Rect srcBounds, Rect destBounds, Region *priorityRegion) {
	GfxSurface srcImage;
	if (srcBounds.isEmpty())
		return;

	if (srcBounds == src.getBounds())
		srcImage = src;
	else {
		// Set the source image to be the subset specified by the source bounds
		Graphics::Surface srcSurface = src.lockSurface();

		srcImage.create(srcBounds.width(), srcBounds.height());
		Graphics::Surface destSurface = srcImage.lockSurface();

		const byte *srcP = (const byte *)srcSurface.getBasePtr(srcBounds.left, srcBounds.top);
		byte *destP = (byte *)destSurface.pixels;
		for (int yp = srcBounds.top; yp < srcBounds.bottom; ++yp, srcP += srcSurface.pitch, destP += destSurface.pitch) {
			Common::copy(srcP, srcP + srcBounds.width(), destP);
		}

		srcImage.unlockSurface();
		src.unlockSurface();
	}

	if ((destBounds.width() != srcBounds.width()) || (destBounds.height() != srcBounds.height()))
		srcImage = ResizeSurface(srcImage, destBounds.width(), destBounds.height(), src._transColor);

	Graphics::Surface srcSurface = srcImage.lockSurface();
	Graphics::Surface destSurface = lockSurface();

	// Adjust bounds to ensure destination will be on-screen
	int srcX = 0, srcY = 0;
	if (destBounds.left < 0) {
		srcX = -destBounds.left;
		destBounds.left = 0;
	}
	if (destBounds.top < 0) {
		srcY = -destBounds.top;
		destBounds.top = 0;
	}
	if (destBounds.right > destSurface.w)
		destBounds.right = destSurface.w;
	if (destBounds.bottom > destSurface.h)
		destBounds.bottom = destSurface.h;

	if (destBounds.isValidRect()) {
		const byte *pSrc = (const byte *)srcSurface.getBasePtr(srcX, srcY);
		byte *pDest = (byte *)destSurface.getBasePtr(destBounds.left, destBounds.top);

		for (int y = 0; y < destBounds.height(); ++y, pSrc += srcSurface.pitch, pDest += destSurface.pitch) {

			if (!priorityRegion && (src._transColor == -1))
				Common::copy(pSrc, pSrc + destBounds.width(), pDest);
			else {
				const byte *tempSrc = pSrc;
				byte *tempDest = pDest;
				int xp = destBounds.left;

				while (tempSrc < (pSrc + destBounds.width())) {
					if (!priorityRegion || !priorityRegion->contains(Common::Point(
							xp + _globals->_sceneManager._scene->_sceneBounds.left,
							destBounds.top + y + _globals->_sceneManager._scene->_sceneBounds.top))) {
						if (*tempSrc != src._transColor)
							*tempDest = *tempSrc;
					}
					++tempSrc;
					++tempDest;
					++xp;
				}
			}
		}
	}

	unlockSurface();
	srcImage.unlockSurface();
}