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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*
*/
#include "common/stdafx.h"
#include "common/scummsys.h"
#include "common/system.h"
#include "graphics/scaler.h"
#include "graphics/scaler/intern.h"
template<int bitFormat>
uint16 quadBlockInterpolate(const uint8* src, uint32 srcPitch) {
uint16 colorx1y1 = *(((const uint16*)src));
uint16 colorx2y1 = *(((const uint16*)src) + 1);
uint16 colorx1y2 = *(((const uint16*)(src + srcPitch)));
uint16 colorx2y2 = *(((const uint16*)(src + srcPitch)) + 1);
return Q_INTERPOLATE<bitFormat>(colorx1y1, colorx2y1, colorx1y2, colorx2y2);
}
template<int bitFormat>
void createThumbnail_2(const uint8* src, uint32 srcPitch, uint8* dstPtr, uint32 dstPitch, int width, int height) {
assert(width % 2 == 0);
assert(height % 2 == 0);
for (int y = 0; y < height; y += 2) {
for (int x = 0; x < width; x += 2, dstPtr += 2) {
*((uint16*)dstPtr) = quadBlockInterpolate<bitFormat>(src + 2 * x, srcPitch);
}
dstPtr += (dstPitch - 2 * width / 2);
src += 2 * srcPitch;
}
}
template<int bitFormat>
void createThumbnail_4(const uint8* src, uint32 srcPitch, uint8* dstPtr, uint32 dstPitch, int width, int height) {
assert(width % 4 == 0);
assert(height % 4 == 0);
for (int y = 0; y < height; y += 4) {
for (int x = 0; x < width; x += 4, dstPtr += 2) {
uint16 upleft = quadBlockInterpolate<bitFormat>(src + 2 * x, srcPitch);
uint16 upright = quadBlockInterpolate<bitFormat>(src + 2 * (x + 2), srcPitch);
uint16 downleft = quadBlockInterpolate<bitFormat>(src + srcPitch * 2 + 2 * x, srcPitch);
uint16 downright = quadBlockInterpolate<bitFormat>(src + srcPitch * 2 + 2 * (x + 2), srcPitch);
*((uint16*)dstPtr) = Q_INTERPOLATE<bitFormat>(upleft, upright, downleft, downright);
}
dstPtr += (dstPitch - 2 * width / 4);
src += 4 * srcPitch;
}
}
void createThumbnail(const uint8* src, uint32 srcPitch, uint8* dstPtr, uint32 dstPitch, int width, int height) {
// only 1/2 and 1/4 downscale supported
if (width != 320 && width != 640)
return;
int downScaleMode = (width == 320) ? 2 : 4;
if (downScaleMode == 2) {
if (gBitFormat == 565)
createThumbnail_2<565>(src, srcPitch, dstPtr, dstPitch, width, height);
else if (gBitFormat == 555)
createThumbnail_2<555>(src, srcPitch, dstPtr, dstPitch, width, height);
} else if (downScaleMode == 4) {
if (gBitFormat == 565)
createThumbnail_4<565>(src, srcPitch, dstPtr, dstPitch, width, height);
else if (gBitFormat == 555)
createThumbnail_4<555>(src, srcPitch, dstPtr, dstPitch, width, height);
}
}
/**
* Copies the current screen contents to a new surface, using RGB565 format.
* WARNING: surf->free() must be called by the user to avoid leaking.
*
* @param surf the surfce to store the data in it
*/
static bool grabScreen565(Graphics::Surface *surf) {
Graphics::Surface screen;
if (!g_system->grabRawScreen(&screen))
return false;
assert(screen.bytesPerPixel == 1 && screen.pixels != 0);
byte palette[256 * 4];
g_system->grabPalette(&palette[0], 0, 256);
surf->create(screen.w, screen.h, 2);
for (uint y = 0; y < screen.h; ++y) {
for (uint x = 0; x < screen.w; ++x) {
byte r, g, b;
r = palette[((uint8*)screen.pixels)[y * screen.pitch + x] * 4];
g = palette[((uint8*)screen.pixels)[y * screen.pitch + x] * 4 + 1];
b = palette[((uint8*)screen.pixels)[y * screen.pitch + x] * 4 + 2];
((uint16*)surf->pixels)[y * surf->w + x] = (((r >> 3) & 0x1F) << 11) | (((g >> 2) & 0x3F) << 5) | ((b >> 3) & 0x1F);
}
}
screen.free();
return true;
}
bool createThumbnailFromScreen(Graphics::Surface* surf) {
assert(surf);
int screenWidth = g_system->getWidth();
int screenHeight = g_system->getHeight();
Graphics::Surface screen;
if (!grabScreen565(&screen))
return false;
uint16 width = screenWidth;
if (screenWidth < 320) {
// Special case to handle MM NES (uses a screen width of 256)
width = 320;
// center MM NES screen
Graphics::Surface newscreen;
newscreen.create(width, screen.h, screen.bytesPerPixel);
uint8 *dst = (uint8*)newscreen.getBasePtr((320 - screenWidth) / 2, 0);
uint8 *src = (uint8*)screen.getBasePtr(0, 0);
uint16 height = screen.h;
while (height--) {
memcpy(dst, src, screen.pitch);
dst += newscreen.pitch;
src += screen.pitch;
}
screen.free();
screen = newscreen;
} else if (screenWidth == 720) {
// Special case to handle Hercules mode
width = 640;
screenHeight = 400;
// cut off menu and so on..
Graphics::Surface newscreen;
newscreen.create(width, 400, screen.bytesPerPixel);
uint8 *dst = (uint8*)newscreen.getBasePtr(0, (400 - 240) / 2);
uint8 *src = (uint8*)screen.getBasePtr(41, 28);
for (int y = 0; y < 240; ++y) {
memcpy(dst, src, 640 * screen.bytesPerPixel);
dst += newscreen.pitch;
src += screen.pitch;
}
screen.free();
screen = newscreen;
}
uint16 newHeight = !(screenHeight % 240) ? kThumbnailHeight2 : kThumbnailHeight1;
int gBitFormatBackUp = gBitFormat;
gBitFormat = 565;
surf->create(kThumbnailWidth, newHeight, sizeof(uint16));
createThumbnail((const uint8*)screen.pixels, width * sizeof(uint16), (uint8*)surf->pixels, surf->pitch, width, screenHeight);
gBitFormat = gBitFormatBackUp;
screen.free();
return true;
}
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