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Draw.c
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Draw.c
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/*
* Tilengine - The 2D retro graphics engine with raster effects
* Copyright (C) 2015-2019 Marc Palacios Domenech <mailto:[email protected]>
* All rights reserved
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
* */
#include <string.h>
#include <stdlib.h>
#include "Tilengine.h"
#include "Draw.h"
#include "Engine.h"
#include "Tileset.h"
#include "Tilemap.h"
#include "ObjectList.h"
#include "Sprite.h"
/* private prototypes */
static void DrawSpriteCollision (int nsprite, uint8_t *srcpixel, uint16_t *dstpixel, int width, int dx);
static void DrawSpriteCollisionScaling (int nsprite, uint8_t *srcpixel, uint16_t *dstpixel, int width, int dx, int srcx);
static bool check_sprite_coverage(Sprite* sprite, int nscan)
{
/* check sprite coverage */
if (nscan < sprite->dstrect.y1 || nscan >= sprite->dstrect.y2)
return false;
if (sprite->dstrect.x2 < 0 || sprite->srcrect.x2 < 0)
return false;
if ((sprite->flags & FLAG_MASKED) && nscan >= engine->sprite_mask_top && nscan <= engine->sprite_mask_bottom)
return false;
return true;
}
/* Draws the next scanline of the frame started with TLN_BeginFrame() or TLN_BeginWindowFrame() */
bool DrawScanline(void)
{
int line = engine->line;
uint8_t* scan = GetFramebufferLine(line);
int size = engine->framebuffer.width;
int c;
int index;
bool background_priority = false; /* at least one tile in priority layer */
bool sprite_priority = false; /* at least one sprite in priority layer */
List* list;
/* call raster effect callback */
if (engine->cb_raster)
engine->cb_raster(line);
/* background is bitmap */
if (engine->bgbitmap && engine->bgpalette)
{
if (size > engine->bgbitmap->width)
size = engine->bgbitmap->width;
if (line < engine->bgbitmap->height)
engine->blit_fast(TLN_GetBitmapPtr(engine->bgbitmap, 0, line), engine->bgpalette, scan, size, 1, 0, NULL);
}
/* background is solid color */
else if (engine->bgcolor)
BlitColor(scan, engine->bgcolor, size);
background_priority = false;
memset(engine->priority, 0, engine->framebuffer.pitch);
memset(engine->collision, -1, engine->framebuffer.width * sizeof(uint16_t));
/* draw background layers */
for (c = engine->numlayers - 1; c >= 0; c--)
{
Layer* layer = &engine->layers[c];
if (layer->ok)
{
/* update if dirty */
if (engine->dirty || layer->dirty)
{
UpdateLayer(c);
layer->dirty = false;
}
/* draw */
if (!layer->priority && line >= layer->clip.y1 && line <= layer->clip.y2)
{
if (layer->draw(c, line) == true)
background_priority = true;
}
}
}
/* draw regular sprites */
list = &engine->list_sprites;
index = list->first;
while (index != -1)
{
Sprite* sprite = &engine->sprites[index];
/* update if dirty */
if (sprite->world_space && (sprite->dirty || engine->dirty))
{
sprite->x = sprite->xworld - engine->xworld;
sprite->y = sprite->yworld - engine->yworld;
UpdateSprite(sprite);
sprite->dirty = false;
}
if (check_sprite_coverage(sprite, line))
{
if (!(sprite->flags & FLAG_PRIORITY))
sprite->draw(index, line);
else
sprite_priority = true;
}
index = sprite->list_node.next;
}
/* draw background layers with priority */
for (c = engine->numlayers - 1; c >= 0; c--)
{
const Layer* layer = &engine->layers[c];
if (layer->ok && layer->priority && line >= layer->clip.y1 && line <= layer->clip.y2)
layer->draw(c, line);
}
/* overlay background tiles with priority */
if (background_priority == true)
{
uint32_t* src = (uint32_t*)engine->priority;
uint32_t* dst = (uint32_t*)scan;
for (c = 0; c < engine->framebuffer.width; c++)
{
if (*src)
*dst = *src;
src++;
dst++;
}
}
/* draw sprites with priority */
if (sprite_priority == true)
{
index = list->first;
while (index != -1)
{
Sprite* sprite = &engine->sprites[index];
if (check_sprite_coverage(sprite, line) && (sprite->flags & FLAG_PRIORITY))
sprite->draw(index, line);
index = sprite->list_node.next;
}
}
/* next scanline */
engine->dirty = false;
engine->line++;
return engine->line < engine->framebuffer.height;
}
/* draw scanline of tiled background */
static bool DrawLayerScanline (int nlayer, int nscan)
{
const Layer *layer = &engine->layers[nlayer];
const TLN_Tileset tileset = layer->tileset;
const TLN_Tilemap tilemap = layer->tilemap;
int shift;
TLN_Tile tile;
uint8_t *srcpixel;
int x,x1;
int xpos, ypos;
int xtile, ytile;
int srcx, srcy;
int direction, width;
int column;
int line;
uint8_t *dstpixel;
uint8_t *dstpixel_pri;
uint8_t *dst;
bool color_key;
bool priority = false;
/* mosaic effect */
if (layer->mosaic.h != 0)
{
shift = 0;
dstpixel = layer->mosaic.buffer;
if (nscan % layer->mosaic.h == 0)
memset (dstpixel, 0, engine->framebuffer.width);
else
goto draw_end;
}
else
{
shift = 2;
dstpixel = GetFramebufferLine (nscan);
}
/* target lines */
x = layer->clip.x1;
dstpixel += (x << shift);
dstpixel_pri = engine->priority;
xpos = (layer->hstart + x) % layer->width;
xtile = xpos >> tileset->hshift;
srcx = xpos & tileset->hmask;
/* fill whole scanline */
column = x % tileset->width;
while (x < layer->clip.x2)
{
int tilewidth;
/* column offset: update ypos */
if (layer->column)
{
ypos = (layer->vstart + nscan + layer->column[column]) % layer->height;
if (ypos < 0)
ypos = layer->height + ypos;
}
else
ypos = (layer->vstart + nscan) % layer->height;
ytile = ypos >> tileset->vshift;
srcy = ypos & tileset->vmask;
tile = &tilemap->tiles[ytile*tilemap->cols + xtile];
/* get effective tile width */
tilewidth = tileset->width - srcx;
x1 = x + tilewidth;
if (x1 > layer->clip.x2)
x1 = layer->clip.x2;
width = x1 - x;
/* paint if not empty tile */
if (tile->index)
{
const uint16_t tile_index = tileset->tiles[tile->index];
/* H/V flip */
if (tile->flags & FLAG_FLIPX)
{
direction = -1;
srcx = tilewidth - 1;
}
else
direction = 1;
if (tile->flags & FLAG_FLIPY)
srcy = tileset->height - srcy - 1;
/* paint tile scanline */
srcpixel = &GetTilesetPixel (tileset, tile_index, srcx, srcy);
if (tile->flags & FLAG_PRIORITY)
{
dst = dstpixel_pri;
priority = true;
}
else
{
dst = dstpixel;
}
line = GetTilesetLine (tileset, tile_index, srcy);
color_key = *(tileset->color_key + line);
layer->blitters[color_key] (srcpixel, layer->palette, dst, width, direction, 0, layer->blend);
}
/* next tile */
x += width;
width <<= shift;
dstpixel += width;
dstpixel_pri += width;
xtile = (xtile + 1) % tilemap->cols;
srcx = 0;
column++;
}
draw_end:
if (layer->mosaic.h != 0)
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = layer->mosaic.buffer + offset;
uint8_t* dstptr = GetFramebufferLine (nscan) + offset;
int width = layer->clip.x2 - layer->clip.x1;
if (layer->blend != NULL)
BlitMosaicBlend (srcptr, layer->palette, dstptr, width, layer->mosaic.w, layer->blend);
else
BlitMosaicSolid (srcptr, layer->palette, dstptr, width, layer->mosaic.w);
}
return priority;
}
/* draw scanline of tiled background with scaling */
static bool DrawLayerScanlineScaling (int nlayer, int nscan)
{
const Layer *layer = &engine->layers[nlayer];
const TLN_Tileset tileset = layer->tileset;
const TLN_Tilemap tilemap = layer->tilemap;
int shift;
TLN_Tile tile;
uint8_t *srcpixel;
int x,x1;
int xpos, ypos;
int xtile, ytile;
int srcx, srcy;
int direction, width;
int column;
int line;
uint8_t *dstpixel;
uint8_t *dstpixel_pri;
uint8_t *dst;
fix_t fix_tilewidth;
fix_t fix_x;
fix_t dx;
bool color_key;
bool priority = false;
/* mosaic effect */
if (layer->mosaic.h != 0)
{
shift = 0;
dstpixel = layer->mosaic.buffer;
if (nscan % layer->mosaic.h == 0)
memset (dstpixel, 0, engine->framebuffer.width);
else
goto draw_end;
}
else
{
shift = 2;
dstpixel = GetFramebufferLine (nscan);
}
/* target lines */
x = layer->clip.x1;
dstpixel += (x << shift);
dstpixel_pri = engine->priority;
xpos = (layer->hstart + fix2int(x*layer->dx)) % layer->width;
xtile = xpos >> tileset->hshift;
srcx = xpos & tileset->hmask;
/* fill whole scanline */
fix_x = int2fix (x);
column = x % tileset->width;
while (x < layer->clip.x2)
{
int tilewidth;
int tilescalewidth;
/* column offset: update ypos */
ypos = nscan;
if (layer->column)
ypos += layer->column[column];
ypos = layer->vstart + fix2int(ypos*layer->dy);
if (ypos < 0)
ypos = layer->height + ypos;
else
ypos = ypos % layer->height;
ytile = ypos >> tileset->vshift;
srcy = ypos & tileset->vmask;
tile = &tilemap->tiles[ytile*tilemap->cols + xtile];
/* get effective tile width */
tilewidth = tileset->width - srcx;
dx = int2fix(tilewidth);
fix_tilewidth = tilewidth * layer->xfactor;
fix_x += fix_tilewidth;
x1 = fix2int (fix_x);
tilescalewidth = x1 - x;
if (tilescalewidth)
dx /= tilescalewidth;
else
dx = 0;
/* right clip */
if (x1 > layer->clip.x2)
x1 = layer->clip.x2;
width = x1 - x;
/* paint if tile is not empty */
if (tile->index)
{
const uint16_t tile_index = tileset->tiles[tile->index];
/* volteado H/V */
if (tile->flags & FLAG_FLIPX)
{
direction = -dx;
srcx = tilewidth - 1;
}
else
direction = dx;
if (tile->flags & FLAG_FLIPY)
srcy = tileset->height - srcy - 1;
/* pinta tile scanline */
srcpixel = &GetTilesetPixel (tileset, tile_index, srcx, srcy);
if (tile->flags & FLAG_PRIORITY)
{
dst = dstpixel_pri;
priority = true;
}
else
{
dst = dstpixel;
}
line = GetTilesetLine (tileset, tile_index, srcy);
color_key = *(tileset->color_key + line);
layer->blitters[color_key] (srcpixel, layer->palette, dst, width, direction, 0, layer->blend);
}
/* next tile */
width <<= shift;
dstpixel += width;
dstpixel_pri += width;
x = x1;
xtile = (xtile + 1) % tilemap->cols;
srcx = 0;
column++;
}
draw_end:
if (layer->mosaic.h != 0)
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = layer->mosaic.buffer + offset;
uint8_t* dstptr = GetFramebufferLine (nscan) + offset;
int width = layer->clip.x2 - layer->clip.x1;
if (layer->blend != NULL)
BlitMosaicBlend (srcptr, layer->palette, dstptr, width, layer->mosaic.w, layer->blend);
else
BlitMosaicSolid (srcptr, layer->palette, dstptr, width, layer->mosaic.w);
}
return priority;
}
/* draw scanline of tiled background with affine transform */
static bool DrawLayerScanlineAffine (int nlayer, int nscan)
{
Layer *layer = &engine->layers[nlayer];
const TLN_Tileset tileset = layer->tileset;
const TLN_Tilemap tilemap = layer->tilemap;
const TLN_Palette palette = layer->palette;
int shift;
TLN_Tile tile;
int x, width;
int x1,y1, x2,y2;
fix_t dx, dy;
int xpos, ypos;
int xtile, ytile;
int srcx, srcy;
uint8_t *dstpixel;
Point2D p1,p2;
/* mosaic effect */
if (layer->mosaic.h != 0)
{
shift = 0;
dstpixel = layer->mosaic.buffer;
if (nscan % layer->mosaic.h == 0)
memset (dstpixel, 0, engine->framebuffer.width);
else
goto draw_end;
}
else
{
shift = 2;
dstpixel = engine->tmpindex;
memset (dstpixel, 0, engine->framebuffer.width);
}
/* target lines */
x = layer->clip.x1;
width = layer->clip.x2;
xpos = layer->hstart;
ypos = layer->vstart + nscan;
Point2DSet (&p1, (math2d_t)xpos,(math2d_t)ypos);
Point2DSet (&p2, (math2d_t)xpos + width, (math2d_t)ypos);
Point2DMultiply (&p1, &layer->transform);
Point2DMultiply (&p2, &layer->transform);
x1 = float2fix(p1.x);
y1 = float2fix(p1.y);
x2 = float2fix(p2.x);
y2 = float2fix(p2.y);
dx = (x2 - x1) / width;
dy = (y2 - y1) / width;
while (x < width)
{
xpos = abs((fix2int(x1) + layer->width)) % layer->width;
ypos = abs((fix2int(y1) + layer->height)) % layer->height;
xtile = xpos >> tileset->hshift;
ytile = ypos >> tileset->vshift;
srcx = xpos & tileset->hmask;
srcy = ypos & tileset->vmask;
tile = &tilemap->tiles[ytile*tilemap->cols + xtile];
/* paint if not empty tile */
if (tile->index)
{
const uint16_t tile_index = tileset->tiles[tile->index];
/* H/V flip */
if (tile->flags & FLAG_FLIPX)
srcx = tileset->width - srcx - 1;
if (tile->flags & FLAG_FLIPY)
srcy = tileset->height - srcy - 1;
/* pinta scanline tile */
*dstpixel = GetTilesetPixel (tileset, tile_index, srcx, srcy);
}
/* next pixel */
x++;
x1 += dx;
y1 += dy;
dstpixel++;
}
draw_end:
if (layer->mosaic.h != 0)
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = layer->mosaic.buffer + offset;
uint8_t* dstptr = GetFramebufferLine (nscan) + offset;
int width = layer->clip.x2 - layer->clip.x1;
if (layer->blend != NULL)
BlitMosaicBlend (srcptr, layer->palette, dstptr, width, layer->mosaic.w, layer->blend);
else
BlitMosaicSolid (srcptr, layer->palette, dstptr, width, layer->mosaic.w);
}
else
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = engine->tmpindex + offset;
uint8_t* dstptr = GetFramebufferLine (nscan) + offset;
int width = layer->clip.x2 - layer->clip.x1;
layer->blitters[1] (srcptr, layer->palette, dstptr, width, 1, 0, layer->blend);
}
return false;
}
/* draw scanline of tiled background with per-pixel mapping */
static bool DrawLayerScanlinePixelMapping (int nlayer, int nscan)
{
Layer *layer = &engine->layers[nlayer];
const TLN_Tileset tileset = layer->tileset;
const TLN_Tilemap tilemap = layer->tilemap;
const TLN_Palette palette = layer->palette;
const int hstart = layer->hstart + layer->width;
const int vstart = layer->vstart + layer->height;
int shift;
TLN_Tile tile;
int x, width;
int xpos, ypos;
int xtile, ytile;
int srcx, srcy;
uint8_t *dstpixel;
TLN_PixelMap* pixel_map;
/* mosaic effect */
if (layer->mosaic.h != 0)
{
shift = 0;
dstpixel = layer->mosaic.buffer;
if (nscan % layer->mosaic.h == 0)
memset (dstpixel, 0, engine->framebuffer.width);
else
goto draw_end;
}
else
{
shift = 2;
dstpixel = engine->tmpindex;
memset (dstpixel, 0, engine->framebuffer.width);
}
/* target lines */
x = layer->clip.x1;
width = layer->clip.x2 - layer->clip.x1;
pixel_map = &layer->pixel_map[nscan*engine->framebuffer.width + x];
while (x < width)
{
xpos = abs(hstart + pixel_map->dx) % layer->width;
ypos = abs(vstart + pixel_map->dy) % layer->height;
xtile = xpos >> tileset->hshift;
ytile = ypos >> tileset->vshift;
srcx = xpos & tileset->hmask;
srcy = ypos & tileset->vmask;
tile = &tilemap->tiles[ytile*tilemap->cols + xtile];
/* paint if not empty tile */
if (tile->index)
{
const uint16_t tile_index = tileset->tiles[tile->index];
/* H/V flip */
if (tile->flags & FLAG_FLIPX)
srcx = tileset->width - srcx - 1;
if (tile->flags & FLAG_FLIPY)
srcy = tileset->height - srcy - 1;
/* paint tile scanline */
*dstpixel = GetTilesetPixel (tileset, tile_index, srcx, srcy);
}
/* next pixel */
x++;
dstpixel++;
pixel_map++;
}
draw_end:
if (layer->mosaic.h != 0)
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = layer->mosaic.buffer + offset;
uint8_t* dstptr = GetFramebufferLine (nscan) + offset;
int width = layer->clip.x2 - layer->clip.x1;
if (layer->blend != NULL)
BlitMosaicBlend (srcptr, layer->palette, dstptr, width, layer->mosaic.w, layer->blend);
else
BlitMosaicSolid (srcptr, layer->palette, dstptr, width, layer->mosaic.w);
}
else
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = engine->tmpindex + offset;
uint8_t* dstptr = GetFramebufferLine (nscan) + offset;
int width = layer->clip.x2 - layer->clip.x1;
layer->blitters[1] (srcptr, layer->palette, dstptr, width, 1, 0, layer->blend);
}
return true;
}
/* draw sprite scanline */
static bool DrawSpriteScanline (int nsprite, int nscan)
{
int w;
Sprite *sprite;
uint8_t *srcpixel;
uint8_t *dstscan;
uint32_t *dstpixel;
int srcx, srcy;
int direction;
sprite = &engine->sprites[nsprite];
dstscan = GetFramebufferLine(nscan);
srcx = sprite->srcrect.x1;
srcy = sprite->srcrect.y1 + (nscan - sprite->dstrect.y1);
w = sprite->dstrect.x2 - sprite->dstrect.x1;
/* H/V flip */
if (sprite->flags & FLAG_FLIPX)
{
direction = -1;
srcx = sprite->info->w - srcx - 1;
}
else
direction = 1;
if (sprite->flags & FLAG_FLIPY)
srcy = sprite->info->h - srcy - 1;
srcpixel = sprite->pixels + (srcy*sprite->pitch) + srcx;
dstpixel = (uint32_t*)(dstscan + (sprite->dstrect.x1 << 2));
sprite->blitter (srcpixel, sprite->palette, dstpixel, w, direction, 0, sprite->blend);
if (sprite->do_collision)
{
uint16_t* dstpixel = engine->collision + sprite->dstrect.x1;
DrawSpriteCollision (nsprite, srcpixel, dstpixel, w, direction);
}
return true;
}
/* draw sprite scanline with scaling */
static bool DrawScalingSpriteScanline (int nsprite, int nscan)
{
Sprite *sprite;
uint8_t *srcpixel;
uint8_t *dstscan;
uint32_t *dstpixel;
int srcx, srcy;
int dstw,dstx,dx;
struct Palette* palette;
sprite = &engine->sprites[nsprite];
dstscan = GetFramebufferLine(nscan);
srcx = sprite->srcrect.x1;
srcy = sprite->srcrect.y1 + (nscan - sprite->dstrect.y1)*sprite->dy;
dstw = sprite->dstrect.x2 - sprite->dstrect.x1;
/* H/V flip */
if (sprite->flags & FLAG_FLIPX)
{
srcx = int2fix(sprite->info->w) - srcx;
dstx = sprite->dstrect.x2;
dx = -sprite->dx;
}
else
{
dstx = sprite->dstrect.x1;
dx = sprite->dx;
}
if (sprite->flags & FLAG_FLIPY)
srcy = int2fix(sprite->info->h) - srcy;
palette = sprite->palette;
srcpixel = sprite->pixels + (fix2int(srcy)*sprite->pitch);
dstpixel = (uint32_t*)(dstscan + (sprite->dstrect.x1 << 2));
sprite->blitter (srcpixel, sprite->palette, dstpixel, dstw, dx, srcx, sprite->blend);
if (sprite->do_collision)
{
uint16_t* dstpixel = engine->collision + sprite->dstrect.x1;
DrawSpriteCollisionScaling (nsprite, srcpixel, dstpixel, dstw, dx, srcx);
}
return true;
}
/* Experimental WIP: blit pre-rotated sprite */
static bool DrawSpriteScanlineRotation(int nsprite, int nscan)
{
int w;
Sprite *sprite;
uint8_t *srcpixel;
uint8_t *dstscan;
uint32_t *dstpixel;
int srcx, srcy;
int direction;
sprite = &engine->sprites[nsprite];
/* comprueba que el sprite está en este scanline y es visible */
/*
if (nscan<sprite->dstrect.y1 || nscan >= sprite->dstrect.y2)
return false;
if (sprite->dstrect.x2 < 0 || sprite->srcrect.x2 < 0)
return false;
*/
if (nscan < sprite->y || nscan > sprite->y + sprite->rotation_bitmap->height)
return false;
dstscan = GetFramebufferLine(nscan);
/*
srcx = sprite->srcrect.x1;
srcy = sprite->srcrect.y1 + (nscan - sprite->dstrect.y1);
w = sprite->dstrect.x2 - sprite->dstrect.x1;
*/
srcx = sprite->srcrect.x1;
srcy = sprite->srcrect.y1 + (nscan - sprite->y);
w = sprite->dstrect.x2 - sprite->dstrect.x1;
/* volteado H/V */
if (sprite->flags & FLAG_FLIPX)
{
direction = -1;
srcx = sprite->rotation_bitmap->width - srcx - 1;
}
else
direction = 1;
if (sprite->flags & FLAG_FLIPY)
srcy = sprite->rotation_bitmap->height - srcy - 1;
srcpixel = sprite->rotation_bitmap->data + (srcy*sprite->rotation_bitmap->pitch) + srcx;
dstpixel = (uint32_t*)(dstscan + (sprite->dstrect.x1 << 2));
sprite->blitter(srcpixel, sprite->palette, dstpixel, w, direction, 0, sprite->blend);
if (sprite->do_collision)
{
uint16_t* dstpixel = engine->collision + sprite->dstrect.x1;
DrawSpriteCollision(nsprite, srcpixel, dstpixel, w, direction);
}
return true;
}
/* updates per-pixel sprite collision buffer */
static void DrawSpriteCollision (int nsprite, uint8_t *srcpixel, uint16_t *dstpixel, int width, int dx)
{
while (width)
{
if (*srcpixel)
{
if (*dstpixel != 0xFFFF)
{
engine->sprites[nsprite].collision = true;
engine->sprites[*dstpixel].collision = true;
}
*dstpixel = (uint16_t)nsprite;
}
srcpixel += dx;
dstpixel++;
width--;
}
}
/* updates per-pixel sprite collision buffer for scaled sprite */
static void DrawSpriteCollisionScaling (int nsprite, uint8_t *srcpixel, uint16_t *dstpixel, int width, int dx, int srcx)
{
while (width)
{
uint32_t src = *(srcpixel + srcx/(1 << FIXED_BITS));
if (src)
{
if (*dstpixel != 0xFFFF)
{
engine->sprites[nsprite].collision = true;
engine->sprites[*dstpixel].collision = true;
}
*dstpixel = (uint16_t)nsprite;
}
/* next pixel */
srcx += dx;
dstpixel++;
width--;
}
}
/* draws regular bitmap scanline for bitmap-based layer */
static bool DrawBitmapScanline(int nlayer, int nscan)
{
const Layer *layer = &engine->layers[nlayer];
TLN_Bitmap bitmap = layer->bitmap;
TLN_Palette palette = layer->palette;
uint8_t *srcpixel;
int shift;
int x, x1;
int xpos, ypos;
int direction, width;
uint8_t *dstpixel;
bool color_key;
/* mosaic effect */
if (layer->mosaic.h != 0)
{
shift = 0;
dstpixel = layer->mosaic.buffer;
if (nscan % layer->mosaic.h == 0)
memset(dstpixel, 0, engine->framebuffer.width);
else
goto draw_end;
}
else
{
shift = 2;
dstpixel = GetFramebufferLine(nscan);
}
/* target lines */
x = layer->clip.x1;
dstpixel += (x << shift);
ypos = (layer->vstart + nscan) % layer->height;
xpos = (layer->hstart + x) % layer->width;
direction = 1;
color_key = true;
/* draws bitmap scanline */
while (x < layer->clip.x2)
{
/* get effective width */
width = layer->width - xpos;
x1 = x + width;
if (x1 > layer->clip.x2)
x1 = layer->clip.x2;
width = x1 - x;
srcpixel = (uint8_t*)get_bitmap_ptr(bitmap, xpos, ypos);
layer->blitters[color_key](srcpixel, palette, dstpixel, width, direction, 0, layer->blend);
x += width;
width <<= shift;
dstpixel += width;
xpos = 0;
}
draw_end:
if (layer->mosaic.h != 0)
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = layer->mosaic.buffer + offset;
uint8_t* dstptr = GetFramebufferLine(nscan) + offset;
int width = layer->clip.x2 - layer->clip.x1;
if (layer->blend != NULL)
BlitMosaicBlend(srcptr, layer->palette, dstptr, width, layer->mosaic.w, layer->blend);
else
BlitMosaicSolid(srcptr, layer->palette, dstptr, width, layer->mosaic.w);
}
return false;
}
/* draws regular bitmap scanline for bitmap-based layer with scaling */
static bool DrawBitmapScanlineScaling(int nlayer, int nscan)
{
const Layer *layer = &engine->layers[nlayer];
int shift;
uint8_t *srcpixel;
int x, x1;
int xpos, ypos;
int direction, width;
uint8_t *dstpixel;
fix_t fix_tilewidth;
fix_t fix_x;
fix_t dx;
bool color_key;
/* mosaic effect */
if (layer->mosaic.h != 0)
{
shift = 0;
dstpixel = layer->mosaic.buffer;
if (nscan % layer->mosaic.h == 0)
memset(dstpixel, 0, engine->framebuffer.width);
else
goto draw_end;
}
else
{
shift = 2;
dstpixel = GetFramebufferLine(nscan);
}
/* target line */
x = layer->clip.x1;
dstpixel += (x << shift);
xpos = (layer->hstart + fix2int(x*layer->dx)) % layer->width;
/* fill whole scanline */
fix_x = int2fix(x);
while (x < layer->clip.x2)
{
int tilescalewidth;
ypos = layer->vstart + fix2int(nscan*layer->dy);
if (ypos < 0)
ypos = layer->height + ypos;
else
ypos = ypos % layer->height;
/* get effective width */
width = layer->width - xpos;
dx = int2fix(width);
fix_tilewidth = width * layer->xfactor;
fix_x += fix_tilewidth;
x1 = fix2int(fix_x);
tilescalewidth = x1 - x;
if (tilescalewidth)
dx /= tilescalewidth;
else
dx = 0;
/* right clipping */
if (x1 > layer->clip.x2)
x1 = layer->clip.x2;
width = x1 - x;
/* draw bitmap scanline */
direction = dx;
srcpixel = (uint8_t*)get_bitmap_ptr(layer->bitmap, xpos, ypos);
color_key = true;
layer->blitters[color_key](srcpixel, layer->palette, dstpixel, width, direction, 0, layer->blend);
/* next */
width <<= shift;
dstpixel += width;
x = x1;
xpos = 0;
}
draw_end:
if (layer->mosaic.h != 0)
{
int offset = (layer->clip.x1 << shift);
uint8_t* srcptr = layer->mosaic.buffer + offset;