1 files changed, 415 insertions, 0 deletions
diff --git a/engines/dreamweb/vgagrafx.cpp b/engines/dreamweb/vgagrafx.cpp
new file mode 100644
index 0000000000..3c92640768
--- /dev/null
+++ b/engines/dreamweb/vgagrafx.cpp
@@ -0,0 +1,415 @@
+/* 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.
+ *
+ */
+
+#include "dreamweb/dreamweb.h"
+#include "engines/util.h"
+#include "graphics/surface.h"
+
+namespace DreamGen {
+
+uint8 *DreamGenContext::workspace() {
+	uint8 *result = segRef(data.word(kWorkspace)).ptr(0, 0);
+	return result;
+}
+
+void DreamGenContext::allocatework() {
+	data.word(kWorkspace) = allocatemem(0x1000);
+}
+
+void DreamGenContext::multiget() {
+	multiget(ds.ptr(si, 0), di, bx, cl, ch);
+	si += cl * ch;
+	di += bx * kScreenwidth + kScreenwidth * ch;
+	cx = 0;
+}
+
+void DreamGenContext::multiget(uint8 *dst, uint16 x, uint16 y, uint8 w, uint8 h) {
+	const uint8 *src = workspace() + x + y * kScreenwidth;
+	if (y + h > 200)
+		h = 200 - y;
+	if (x + w > 320)
+		w = 320 - x;
+	//debug(1, "multiget %u,%u %ux%u -> segment: %04x->%04x", x, y, w, h, (uint16)ds, (uint16)es);
+	for(unsigned l = 0; l < h; ++l) {
+		const uint8 *src_p = src + kScreenwidth * l;
+		uint8 *dst_p = dst + w * l;
+		memcpy(dst_p, src_p, w);
+	}
+}
+
+void DreamGenContext::multiput() {
+	multiput(ds.ptr(si, 0), di, bx, cl, ch);
+	si += cl * ch;
+	di += bx * kScreenwidth + kScreenwidth * ch;
+	cx = 0;
+}
+
+void DreamGenContext::multiput(const uint8 *src, uint16 x, uint16 y, uint8 w, uint8 h) {
+	uint8 *dst = workspace() + x + y * kScreenwidth;
+	if (y + h > 200)
+		h = 200 - y;
+	if (x + w > 320)
+		w = 320 - x;
+	//debug(1, "multiput %ux%u -> segment: %04x->%04x", w, h, (uint16)ds, (uint16)es);
+	for(unsigned l = 0; l < h; ++l) {
+		const uint8 *src_p = src + w * l;
+		uint8 *dst_p = dst + kScreenwidth * l;
+		memcpy(dst_p, src_p, w);
+	}
+}
+
+void DreamGenContext::multidump(uint16 x, uint16 y, uint8 width, uint8 height) {
+	unsigned offset = x + y * kScreenwidth;
+	//debug(1, "multidump %ux%u(segment: %04x) -> %d,%d(address: %d)", w, h, (uint16)ds, x, y, offset);
+	engine->blit(workspace() + offset, kScreenwidth, x, y, width, height);
+}
+
+void DreamGenContext::multidump() {
+	multidump(di, bx, cl, ch);
+	unsigned offset = di + bx * kScreenwidth;
+	si = di = offset + ch * kScreenwidth;
+	cx = 0;
+}
+
+void DreamGenContext::worktoscreen() {
+	uint size = 320 * 200;
+	engine->blit(workspace(), 320, 0, 0, 320, 200);
+	di = si = size;
+	cx = 0;
+}
+
+void DreamGenContext::printundermon() {
+	engine->printUnderMonitor();
+}
+
+void DreamGenContext::cls() {
+	engine->cls();
+}
+
+void DreamGenContext::frameoutnm(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
+	dst += pitch * y + x;
+
+	for (uint16 j = 0; j < height; ++j) {
+		memcpy(dst, src, width);
+		dst += pitch;
+		src += width;
+	}
+}
+
+void DreamGenContext::frameoutbh(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
+	uint16 stride = pitch - width;
+	dst += y * pitch + x;
+
+	for (uint16 i = 0; i < height; ++i) {
+		for (uint16 j = 0; j < width; ++j) {
+			if (*dst == 0xff) {
+				*dst = *src;
+			}
+			++src;
+			++dst;
+		}
+		dst += stride;
+	}
+}
+
+void DreamGenContext::frameoutfx(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
+	uint16 stride = pitch - width;
+	dst += y * pitch + x;
+	dst -= width;
+
+	for (uint16 j = 0; j < height; ++j) {
+		for (uint16 i = 0; i < width; ++i) {
+			uint8 pixel = src[width - i - 1];
+			if (pixel)
+				*dst = pixel;
+			++dst;
+		}
+		src += width;
+		dst += stride;
+	}
+}
+
+void DreamGenContext::doshake() {
+	uint8 &counter = data.byte(kShakecounter);
+	_cmp(counter, 48);
+	if (flags.z())
+		return;
+
+	_add(counter, 1);
+	static const int shakeTable[] = {
+		0, -2,  3, -2,  0,  2,  4, -1,
+		1, -3,  3,  2,  0, -2,  3, -2,
+		0,  2,  4, -1,  1, -3,  3,  2,
+		0, -2,  3, -2,  0,  2,  4, -1,
+
+		1, -3,  3,  2,  0, -2,  3, -2,
+		0,  2,  4, -1,  1, -3,  3,  2,
+		0, -2,  3, -2,  0,  2,  4, -1,
+		1, -3,  3,  2,  0, -2,  3, -2,
+
+		0,  2,  4, -1,  1, -3,  3,  2,
+		0, -2,  3, -2,  0,  2,  4, -1,
+		1, -3,  3,  2,  0, -2,  3, -2,
+		0,  2,  4, -1,  1, -3,  3,  2,
+
+		0, -2,  3, -2,  0,  2,  4, -1,
+		1, -3,  3,  0,
+	};
+	int offset = shakeTable[counter];
+	engine->setShakePos(offset >= 0 ? offset : -offset);
+}
+
+void DreamGenContext::vsync() {
+	push(ax);
+	push(bx);
+	push(cx);
+	push(dx);
+	push(si);
+	push(di);
+	push(es);
+	push(ds);
+	engine->waitForVSync();
+	ds = pop();
+	es = pop();
+	di = pop();
+	si = pop();
+	dx = pop();
+	cx = pop();
+	bx = pop();
+	ax = pop();
+}
+
+void DreamGenContext::setmode() {
+	vsync();
+	initGraphics(320, 200, false);
+}
+
+static Common::String getFilename(Context &context) {
+	uint16 name_ptr = context.dx;
+	Common::String name;
+	uint8 c;
+	while((c = context.cs.byte(name_ptr++)) != 0)
+		name += (char)c;
+	return name;
+}
+
+void DreamGenContext::showpcx() {
+	Common::String name = getFilename(*this);
+	Common::File pcxFile;
+
+	if (!pcxFile.open(name)) {
+		warning("showpcx: Could not open '%s'", name.c_str());
+		return;
+	}
+
+	uint8 *maingamepal;
+	int i, j;
+
+	// Read the 16-color palette into the 'maingamepal' buffer. Note that
+	// the color components have to be adjusted from 8 to 6 bits.
+
+	pcxFile.seek(16, SEEK_SET);
+	es = data.word(kBuffers);
+	maingamepal = es.ptr(kMaingamepal, 768);
+	pcxFile.read(maingamepal, 48);
+
+	memset(maingamepal + 48, 0xff, 720);
+	for (i = 0; i < 48; i++) {
+		maingamepal[i] >>= 2;
+	}
+
+	// Decode the image data.
+
+	Graphics::Surface *s = g_system->lockScreen();
+	Common::Rect rect(640, 480);
+
+	s->fillRect(rect, 0);
+	pcxFile.seek(128, SEEK_SET);
+
+	for (int y = 0; y < 480; y++) {
+		byte *dst = (byte *)s->getBasePtr(0, y);
+		int decoded = 0;
+
+		while (decoded < 320) {
+			byte col = pcxFile.readByte();
+			byte len;
+
+			if ((col & 0xc0) == 0xc0) {
+				len = col & 0x3f;
+				col = pcxFile.readByte();
+			} else {
+				len = 1;
+			}
+
+			// The image uses 16 colors and is stored as four bit
+			// planes, one for each bit of the color, least
+			// significant bit plane first.
+
+			for (i = 0; i < len; i++) {
+				int plane = decoded / 80;
+				int pos = decoded % 80;
+
+				for (j = 0; j < 8; j++) {
+					byte bit = (col >> (7 - j)) & 1;
+					dst[8 * pos + j] |= (bit << plane);
+				}
+
+				decoded++;
+			}
+		}
+	}
+
+	g_system->unlockScreen();
+	pcxFile.close();
+}
+
+void DreamGenContext::frameoutv(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
+	// NB : These resilience checks were not in the original engine, but did they result in undefined behaviour
+	// or was something broken during porting to C++?
+	assert(pitch == 320);
+
+	if(x >= 320)
+		return;
+	if(y >= 200)
+		return;
+	if(x + width > 320) {
+		width = 320 - x;
+	}
+	if(y + height > 200) {
+		height = 200 - y;
+	}
+
+	uint16 stride = pitch - width;
+	dst += pitch * y + x;
+
+	for (uint16 j = 0; j < height; ++j) {
+		for (uint16 i = 0; i < width; ++i) {
+			uint8 pixel = *src++;
+			if (pixel)
+				*dst = pixel;
+			++dst;
+		}
+		dst += stride;
+	}
+}
+
+void DreamGenContext::showframe(const Frame *frameData, uint16 x, uint16 y, uint16 frameNumber, uint8 effectsFlag) {
+	uint8 width, height;
+	showframe(frameData, x, y, frameNumber, effectsFlag, &width, &height);
+}
+
+void DreamGenContext::showframe(const Frame *frameData, uint16 x, uint16 y, uint16 frameNumber, uint8 effectsFlag, uint8 *width, uint8 *height) {
+	const Frame *frame = frameData + frameNumber;
+	if ((frame->width == 0) && (frame->height == 0)) {
+		*width = 0;
+		*height = 0;
+		return;
+	}
+
+//notblankshow:
+	if ((effectsFlag & 128) == 0) {
+		x += frame->x;
+		y += frame->y;
+	}
+//skipoffsets:
+
+	*width = frame->width;
+	*height = frame->height;
+	const uint8 *pSrc = ((const uint8 *)frameData) + frame->ptr() + 2080;
+
+	if (effectsFlag) {
+		if (effectsFlag & 128) { //centred
+			x -= *width / 2;
+			y -= *height / 2;
+		}
+		if (effectsFlag & 64) { //diffdest
+			frameoutfx(es.ptr(0, dx * *height), pSrc, dx, *width, *height, x, y);
+			return;
+		}
+		if (effectsFlag & 8) { //printlist
+			/*
+			push(ax);
+			al = x - data.word(kMapadx);
+			ah = y - data.word(kMapady);
+			//addtoprintlist(); // NB: Commented in the original asm
+			ax = pop();
+			*/
+		}
+		if (effectsFlag & 4) { //flippedx
+			frameoutfx(workspace(), pSrc, 320, *width, *height, x, y);
+			return;
+		}
+		if (effectsFlag & 2) { //nomask
+			frameoutnm(workspace(), pSrc, 320, *width, *height, x, y);
+			return;
+		}
+		if (effectsFlag & 32) {
+			frameoutbh(workspace(), pSrc, 320, *width, *height, x, y);
+			return;
+		}
+	}
+//noeffects:
+	frameoutv(workspace(), pSrc, 320, *width, *height, x, y);
+	return;
+}
+
+void DreamGenContext::showframe() {
+	uint8 width, height;
+	showframe((Frame *)ds.ptr(0, 0), di, bx, ax & 0x1ff, ah & 0xfe, &width, &height);
+	cl = width;
+	ch = height;
+}
+
+void DreamGenContext::clearwork() {
+	memset(workspace(), 0, 320*200);
+}
+
+void DreamGenContext::zoom() {
+	if (data.word(kWatchingtime) != 0)
+		return;
+	if (data.byte(kZoomon) != 1)
+		return;
+	if (data.byte(kCommandtype) >= 199) {
+		putunderzoom();
+		return;
+	}
+	uint16 srcOffset = (data.word(kOldpointery) - 9) * 320 + (data.word(kOldpointerx) - 11);
+	uint16 dstOffset = (kZoomy + 4) * 320 + (kZoomx + 5);
+	const uint8 *src = workspace() + srcOffset;
+	uint8 *dst = workspace() + dstOffset;
+	for(size_t i=0; i<20; ++i) {
+		for(size_t j=0; j<23; ++j) {
+			uint8 v = src[j];
+			dst[2*j+0] = v;
+			dst[2*j+1] = v; 
+			dst[2*j+320] = v;
+			dst[2*j+321] = v; 
+		}
+		src += 320;
+		dst += 320*2;
+	}
+	crosshair();
+	data.byte(kDidzoom) = 1;
+}
+
+} /*namespace dreamgen */
+