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/* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef BACKENDS_GRAPHICS_ATARI_VIDEL_H
#define BACKENDS_GRAPHICS_ATARI_VIDEL_H
#include "backends/graphics/atari/atari-graphics.h"
#include "backends/graphics/atari/atari-c2p-asm.h"
#include "backends/graphics/atari/atari-graphics-asm.h"
#include "common/system.h"
class AtariVidelManager : public AtariGraphicsManager {
public:
AtariVidelManager() {
// using virtual methods so must be done here
allocateSurfaces();
}
~AtariVidelManager() {
// using virtual methods so must be done here
freeSurfaces();
}
private:
void copyRectToSurface(Graphics::Surface &dstSurface, const Graphics::Surface &srcSurface,
int destX, int destY,
const Common::Rect &subRect) const override {
assert(subRect.left % 16 == 0);
assert(subRect.width() % 16 == 0);
assert(destX % 16 == 0);
assert(srcSurface.format == dstSurface.format);
const int bitsPerPixel = getBitsPerPixel(dstSurface.format);
// 'pChunkyEnd' is a delicate parameter: the c2p routine compares it to the address register
// used for pixel reading; two common mistakes:
// 1. (subRect.left, subRect.bottom) = beginning of the next line *including the offset*
// 2. (subRect.right, subRect.bottom) = even worse, end of the *next* line, not current one
const byte *pChunky = (const byte *)srcSurface.getBasePtr(subRect.left, subRect.top);
const byte *pChunkyEnd = (const byte *)srcSurface.getBasePtr(subRect.right, subRect.bottom-1);
byte *pScreen = (byte *)dstSurface.getPixels() + destY * dstSurface.pitch + destX * bitsPerPixel/8;
if (bitsPerPixel == 8) {
if (srcSurface.pitch == subRect.width()) {
if (srcSurface.pitch == dstSurface.pitch) {
asm_c2p1x1_8(pChunky, pChunkyEnd, pScreen);
return;
} else if (srcSurface.pitch == dstSurface.pitch/2) {
asm_c2p1x1_8_tt(pChunky, pChunkyEnd, pScreen, dstSurface.pitch);
return;
}
}
asm_c2p1x1_8_rect(
pChunky, pChunkyEnd,
subRect.width(),
srcSurface.pitch,
pScreen,
dstSurface.pitch);
} else {
if (srcSurface.pitch == subRect.width() && srcSurface.pitch/2 == dstSurface.pitch) {
asm_c2p1x1_4(pChunky, pChunkyEnd, pScreen);
return;
}
asm_c2p1x1_4_rect(
pChunky, pChunkyEnd,
subRect.width(),
srcSurface.pitch,
pScreen,
dstSurface.pitch);
}
}
void drawMaskedSprite(Graphics::Surface &dstSurface,
const Graphics::Surface &srcSurface, const Graphics::Surface &srcMask,
int destX, int destY,
const Common::Rect &subRect) const override {
assert(subRect.width() % 16 == 0);
assert(subRect.width() == srcSurface.w);
assert(srcSurface.format == dstSurface.format);
const int bitsPerPixel = getBitsPerPixel(dstSurface.format);
if (bitsPerPixel == 4) {
asm_draw_4bpl_sprite(
(uint16 *)dstSurface.getPixels(), (const uint16 *)srcSurface.getBasePtr(subRect.left, subRect.top),
(const uint16 *)srcMask.getBasePtr(subRect.left, subRect.top),
destX, destY,
dstSurface.pitch, subRect.width(), subRect.height());
} else if (bitsPerPixel == 8) {
asm_draw_8bpl_sprite(
(uint16 *)dstSurface.getPixels(), (const uint16 *)srcSurface.getBasePtr(subRect.left, subRect.top),
(const uint16 *)srcMask.getBasePtr(subRect.left, subRect.top),
destX, destY,
dstSurface.pitch, subRect.width(), subRect.height());
}
}
};
#endif
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