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gzdoom-gles/src/v_draw.cpp
Christoph Oelckers 3a198a29dc - fixed: fullscreen images with texture scaling used the unscaled size for 
positioning. To avoid future problems with them I added a new DTA_Fullscreen
  option for DrawTexture.


SVN r1983 (trunk)
2009-11-15 14:33:35 +00:00

1167 lines
28 KiB
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/*
** v_draw.cpp
** Draw patches and blocks to a canvas
**
**---------------------------------------------------------------------------
** Copyright 1998-2008 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include <stdio.h>
#include <stdarg.h>
#include "doomtype.h"
#include "v_video.h"
#include "m_swap.h"
#include "r_defs.h"
#include "r_draw.h"
#include "r_main.h"
#include "r_things.h"
#include "r_translate.h"
#include "doomstat.h"
#include "v_palette.h"
#include "i_system.h"
#include "i_video.h"
#include "templates.h"
#include "d_net.h"
#include "colormatcher.h"
// [RH] Stretch values to make a 320x200 image best fit the screen
// without using fractional steppings
int CleanXfac, CleanYfac;
// [RH] Effective screen sizes that the above scale values give you
int CleanWidth, CleanHeight;
CVAR (Bool, hud_scale, false, CVAR_ARCHIVE);
// For routines that take RGB colors, cache the previous lookup in case there
// are several repetitions with the same color.
static int LastPal = -1;
static uint32 LastRGB;
static int PalFromRGB(uint32 rgb)
{
if (LastPal >= 0 && LastRGB == rgb)
{
return LastPal;
}
// Quick check for black and white.
if (rgb == MAKEARGB(255,0,0,0))
{
LastPal = GPalette.BlackIndex;
}
else if (rgb == MAKEARGB(255,255,255,255))
{
LastPal = GPalette.WhiteIndex;
}
else
{
LastPal = ColorMatcher.Pick(RPART(rgb), GPART(rgb), BPART(rgb));
}
LastRGB = rgb;
return LastPal;
}
void STACK_ARGS DCanvas::DrawTexture (FTexture *img, double x, double y, int tags_first, ...)
{
va_list tags;
va_start(tags, tags_first);
DrawTextureV(img, x, y, tags_first, tags);
}
void STACK_ARGS DCanvas::DrawTextureV(FTexture *img, double x, double y, uint32 tag, va_list tags)
{
FTexture::Span unmaskedSpan[2];
const FTexture::Span **spanptr, *spans;
static short bottomclipper[MAXWIDTH], topclipper[MAXWIDTH];
DrawParms parms;
if (!ParseDrawTextureTags(img, x, y, tag, tags, &parms, false))
{
return;
}
if (parms.masked)
{
spanptr = &spans;
}
else
{
spanptr = NULL;
}
if (APART(parms.colorOverlay) != 0)
{
// The software renderer cannot invert the source without inverting the overlay
// too. That means if the source is inverted, we need to do the reverse of what
// the invert overlay flag says to do.
INTBOOL invertoverlay = (parms.style.Flags & STYLEF_InvertOverlay);
if (parms.style.Flags & STYLEF_InvertSource)
{
invertoverlay = !invertoverlay;
}
if (invertoverlay)
{
parms.colorOverlay = PalEntry(parms.colorOverlay).InverseColor();
}
// Note that this overrides DTA_Translation in software, but not in hardware.
FDynamicColormap *colormap = GetSpecialLights(MAKERGB(255,255,255),
parms.colorOverlay & MAKEARGB(0,255,255,255), 0);
parms.translation = &colormap->Maps[(APART(parms.colorOverlay)*NUMCOLORMAPS/255)*256];
}
if (parms.translation != NULL)
{
dc_colormap = (lighttable_t *)parms.translation;
}
else
{
dc_colormap = identitymap;
}
fixedcolormap = dc_colormap;
ESPSResult mode = R_SetPatchStyle (parms.style, parms.alpha, 0, parms.fillcolor);
BYTE *destorgsave = dc_destorg;
dc_destorg = screen->GetBuffer();
double x0 = parms.x - parms.left * parms.destwidth / parms.texwidth;
double y0 = parms.y - parms.top * parms.destheight / parms.texheight;
if (mode != DontDraw)
{
const BYTE *pixels;
int stop4;
if (spanptr == NULL)
{ // Create a single span for forced unmasked images
spans = unmaskedSpan;
unmaskedSpan[0].TopOffset = 0;
unmaskedSpan[0].Length = img->GetHeight();
unmaskedSpan[1].TopOffset = 0;
unmaskedSpan[1].Length = 0;
}
fixed_t centeryback = centeryfrac;
centeryfrac = 0;
sprtopscreen = FLOAT2FIXED(y0);
// There is not enough precision in the drawing routines to keep the full
// precision for y0. :(
sprtopscreen &= ~(FRACUNIT - 1);
double yscale = parms.destheight / img->GetHeight();
double iyscale = 1 / yscale;
spryscale = FLOAT2FIXED(yscale);
#if 0
// Fix precision errors that are noticeable at some resolutions
if ((y0 + parms.destheight) > (y0 + yscale * img->GetHeight()))
{
spryscale++;
}
#endif
sprflipvert = false;
//dc_iscale = FLOAT2FIXED(iyscale);
//dc_texturemid = FLOAT2FIXED((-y0) * iyscale);
//dc_iscale = 0xffffffffu / (unsigned)spryscale;
dc_iscale = DivScale32(1, spryscale);
dc_texturemid = FixedMul(-sprtopscreen, dc_iscale) + FixedMul(centeryfrac-FRACUNIT, dc_iscale);
fixed_t frac = 0;
double xiscale = img->GetWidth() / parms.destwidth;
double x2 = x0 + parms.destwidth;
if (bottomclipper[0] != parms.dclip)
{
clearbufshort(bottomclipper, screen->GetWidth(), (short)parms.dclip);
}
if (parms.uclip != 0)
{
if (topclipper[0] != parms.uclip)
{
clearbufshort(topclipper, screen->GetWidth(), (short)parms.uclip);
}
mceilingclip = topclipper;
}
else
{
mceilingclip = zeroarray;
}
mfloorclip = bottomclipper;
if (parms.flipX)
{
frac = (img->GetWidth() << FRACBITS) - 1;
xiscale = -xiscale;
}
if (parms.windowleft > 0 || parms.windowright < parms.texwidth)
{
double xscale = parms.destwidth / parms.texwidth;
x0 += parms.windowleft * xscale;
frac += FLOAT2FIXED(parms.windowleft);
x2 -= (parms.texwidth - parms.windowright) * xscale;
}
if (x0 < parms.lclip)
{
frac += FLOAT2FIXED((parms.lclip - x0) * xiscale);
x0 = parms.lclip;
}
if (x2 > parms.rclip)
{
x2 = parms.rclip;
}
// Drawing short output ought to fit in the data cache well enough
// if we draw one column at a time, so do that, since it's simpler.
if (parms.destheight < 32 || (parms.dclip - parms.uclip) < 32)
{
mode = DoDraw0;
}
dc_x = int(x0);
int x2_i = int(x2);
fixed_t xiscale_i = FLOAT2FIXED(xiscale);
if (mode == DoDraw0)
{
// One column at a time
stop4 = dc_x;
}
else // DoDraw1`
{
// Up to four columns at a time
stop4 = x2_i & ~3;
}
if (dc_x < x2_i)
{
while ((dc_x < stop4) && (dc_x & 3))
{
pixels = img->GetColumn(frac >> FRACBITS, spanptr);
R_DrawMaskedColumn(pixels, spans);
dc_x++;
frac += xiscale_i;
}
while (dc_x < stop4)
{
rt_initcols();
for (int zz = 4; zz; --zz)
{
pixels = img->GetColumn(frac >> FRACBITS, spanptr);
R_DrawMaskedColumnHoriz(pixels, spans);
dc_x++;
frac += xiscale_i;
}
rt_draw4cols(dc_x - 4);
}
while (dc_x < x2_i)
{
pixels = img->GetColumn(frac >> FRACBITS, spanptr);
R_DrawMaskedColumn(pixels, spans);
dc_x++;
frac += xiscale_i;
}
}
centeryfrac = centeryback;
}
R_FinishSetPatchStyle ();
dc_destorg = destorgsave;
if (ticdup != 0 && menuactive == MENU_Off)
{
NetUpdate();
}
}
bool DCanvas::ParseDrawTextureTags (FTexture *img, double x, double y, DWORD tag, va_list tags, DrawParms *parms, bool hw) const
{
INTBOOL boolval;
int intval;
bool translationset = false;
bool virtBottom;
if (img == NULL || img->UseType == FTexture::TEX_Null)
{
va_end(tags);
return false;
}
// Do some sanity checks on the coordinates.
if (x < -16383 || x > 16383 || y < -16383 || y > 16383)
{
va_end(tags);
return false;
}
virtBottom = false;
parms->texwidth = img->GetScaledWidthDouble();
parms->texheight = img->GetScaledHeightDouble();
parms->windowleft = 0;
parms->windowright = parms->texwidth;
parms->dclip = this->GetHeight();
parms->uclip = 0;
parms->lclip = 0;
parms->rclip = this->GetWidth();
parms->destwidth = parms->windowright;
parms->destheight = parms->texheight;
parms->top = img->GetScaledTopOffset();
parms->left = img->GetScaledLeftOffset();
parms->alpha = FRACUNIT;
parms->fillcolor = -1;
parms->remap = NULL;
parms->translation = NULL;
parms->colorOverlay = 0;
parms->alphaChannel = false;
parms->flipX = false;
parms->shadowAlpha = 0;
parms->shadowColor = 0;
parms->virtWidth = this->GetWidth();
parms->virtHeight = this->GetHeight();
parms->keepratio = false;
parms->style.BlendOp = 255; // Dummy "not set" value
parms->masked = true;
parms->bilinear = false;
parms->specialcolormap = NULL;
parms->colormapstyle = NULL;
parms->x = x;
parms->y = y;
// Parse the tag list for attributes. (For floating point attributes,
// consider that the C ABI dictates that all floats be promoted to
// doubles when passed as function arguments.)
while (tag != TAG_DONE)
{
va_list *more_p;
DWORD data;
switch (tag)
{
case TAG_IGNORE:
default:
data = va_arg(tags, DWORD);
break;
case TAG_MORE:
more_p = va_arg(tags, va_list *);
va_end (tags);
#ifndef NO_VA_COPY
va_copy (tags, *more_p);
#else
tags = *more_p;
#endif
break;
case DTA_DestWidth:
parms->destwidth = va_arg(tags, int);
break;
case DTA_DestWidthF:
parms->destwidth = va_arg(tags, double);
break;
case DTA_DestHeight:
parms->destheight = va_arg(tags, int);
break;
case DTA_DestHeightF:
parms->destheight = va_arg(tags, double);
break;
case DTA_Clean:
boolval = va_arg(tags, INTBOOL);
if (boolval)
{
parms->x = (parms->x - 160.0) * CleanXfac + (Width * 0.5);
parms->y = (parms->y - 100.0) * CleanYfac + (Height * 0.5);
parms->destwidth = parms->texwidth * CleanXfac;
parms->destheight = parms->texheight * CleanYfac;
}
break;
case DTA_CleanNoMove:
boolval = va_arg(tags, INTBOOL);
if (boolval)
{
parms->destwidth = parms->texwidth * CleanXfac;
parms->destheight = parms->texheight * CleanYfac;
}
break;
case DTA_320x200:
boolval = va_arg(tags, INTBOOL);
if (boolval)
{
parms->virtWidth = 320;
parms->virtHeight = 200;
}
break;
case DTA_Bottom320x200:
boolval = va_arg(tags, INTBOOL);
if (boolval)
{
parms->virtWidth = 320;
parms->virtHeight = 200;
}
virtBottom = true;
break;
case DTA_HUDRules:
{
bool xright = parms->x < 0;
bool ybot = parms->y < 0;
intval = va_arg(tags, int);
if (hud_scale)
{
parms->x *= CleanXfac;
if (intval == HUD_HorizCenter)
parms->x += Width * 0.5;
else if (xright)
parms->x = Width + parms->x;
parms->y *= CleanYfac;
if (ybot)
parms->y = Height + parms->y;
parms->destwidth = parms->texwidth * CleanXfac;
parms->destheight = parms->texheight * CleanYfac;
}
else
{
if (intval == HUD_HorizCenter)
parms->x += Width * 0.5;
else if (xright)
parms->x = Width + parms->x;
if (ybot)
parms->y = Height + parms->y;
}
}
break;
case DTA_VirtualWidth:
parms->virtWidth = va_arg(tags, int);
break;
case DTA_VirtualWidthF:
parms->virtWidth = va_arg(tags, double);
break;
case DTA_VirtualHeight:
parms->virtHeight = va_arg(tags, int);
break;
case DTA_VirtualHeightF:
parms->virtHeight = va_arg(tags, double);
break;
case DTA_Fullscreen:
boolval = va_arg(tags, INTBOOL);
if (boolval)
{
parms->x = parms->y = 0;
parms->virtWidth = img->GetScaledWidthDouble();
parms->virtHeight = img->GetScaledHeightDouble();
}
break;
case DTA_Alpha:
parms->alpha = MIN<fixed_t>(FRACUNIT, va_arg (tags, fixed_t));
break;
case DTA_AlphaChannel:
parms->alphaChannel = va_arg(tags, INTBOOL);
break;
case DTA_FillColor:
parms->fillcolor = va_arg(tags, uint32);
break;
case DTA_Translation:
parms->remap = va_arg(tags, FRemapTable *);
break;
case DTA_ColorOverlay:
parms->colorOverlay = va_arg(tags, DWORD);
break;
case DTA_FlipX:
parms->flipX = va_arg(tags, INTBOOL);
break;
case DTA_TopOffset:
parms->top = va_arg(tags, int);
break;
case DTA_TopOffsetF:
parms->top = va_arg(tags, double);
break;
case DTA_LeftOffset:
parms->left = va_arg(tags, int);
break;
case DTA_LeftOffsetF:
parms->left = va_arg(tags, double);
break;
case DTA_CenterOffset:
if (va_arg(tags, int))
{
parms->left = parms->texwidth * 0.5;
parms->top = parms->texheight * 0.5;
}
break;
case DTA_CenterBottomOffset:
if (va_arg(tags, int))
{
parms->left = parms->texwidth * 0.5;
parms->top = parms->texheight;
}
break;
case DTA_WindowLeft:
parms->windowleft = va_arg(tags, int);
break;
case DTA_WindowLeftF:
parms->windowleft = va_arg(tags, double);
break;
case DTA_WindowRight:
parms->windowright = va_arg(tags, int);
break;
case DTA_WindowRightF:
parms->windowright = va_arg(tags, double);
break;
case DTA_ClipTop:
parms->uclip = va_arg(tags, int);
if (parms->uclip < 0)
{
parms->uclip = 0;
}
break;
case DTA_ClipBottom:
parms->dclip = va_arg(tags, int);
if (parms->dclip > this->GetHeight())
{
parms->dclip = this->GetHeight();
}
break;
case DTA_ClipLeft:
parms->lclip = va_arg(tags, int);
if (parms->lclip < 0)
{
parms->lclip = 0;
}
break;
case DTA_ClipRight:
parms->rclip = va_arg(tags, int);
if (parms->rclip > this->GetWidth())
{
parms->rclip = this->GetWidth();
}
break;
case DTA_ShadowAlpha:
parms->shadowAlpha = MIN<fixed_t>(FRACUNIT, va_arg (tags, fixed_t));
break;
case DTA_ShadowColor:
parms->shadowColor = va_arg(tags, int);
break;
case DTA_Shadow:
boolval = va_arg(tags, INTBOOL);
if (boolval)
{
parms->shadowAlpha = FRACUNIT/2;
parms->shadowColor = 0;
}
else
{
parms->shadowAlpha = 0;
}
break;
case DTA_Masked:
parms->masked = va_arg(tags, INTBOOL);
break;
case DTA_BilinearFilter:
parms->bilinear = va_arg(tags, INTBOOL);
break;
case DTA_KeepRatio:
// I think this is a terribly misleading name, since it actually turns
// *off* aspect ratio correction.
parms->keepratio = va_arg(tags, INTBOOL);
break;
case DTA_RenderStyle:
parms->style.AsDWORD = va_arg(tags, DWORD);
break;
case DTA_SpecialColormap:
parms->specialcolormap = va_arg(tags, FSpecialColormap *);
break;
case DTA_ColormapStyle:
parms->colormapstyle = va_arg(tags, FColormapStyle *);
break;
}
tag = va_arg(tags, DWORD);
}
va_end (tags);
if (parms->uclip >= parms->dclip || parms->lclip >= parms->rclip)
{
return false;
}
if (parms->virtWidth != Width || parms->virtHeight != Height)
{
VirtualToRealCoords(parms->x, parms->y, parms->destwidth, parms->destheight,
parms->virtWidth, parms->virtHeight, virtBottom, !parms->keepratio);
}
if (parms->destwidth <= 0 || parms->destheight <= 0)
{
return false;
}
if (parms->remap != NULL)
{
parms->translation = parms->remap->Remap;
}
if (parms->style.BlendOp == 255)
{
if (parms->fillcolor != ~0u)
{
if (parms->alphaChannel)
{
parms->style = STYLE_Shaded;
}
else if (parms->alpha < FRACUNIT)
{
parms->style = STYLE_TranslucentStencil;
}
else
{
parms->style = STYLE_Stencil;
}
}
else if (parms->alpha < FRACUNIT)
{
parms->style = STYLE_Translucent;
}
else
{
parms->style = STYLE_Normal;
}
}
return true;
}
void DCanvas::VirtualToRealCoords(double &x, double &y, double &w, double &h,
double vwidth, double vheight, bool vbottom, bool handleaspect) const
{
int myratio = handleaspect ? CheckRatio (Width, Height) : 0;
double right = x + w;
double bottom = y + h;
if (myratio != 0 && myratio != 4)
{ // The target surface is either 16:9 or 16:10, so expand the
// specified virtual size to avoid undesired stretching of the
// image. Does not handle non-4:3 virtual sizes. I'll worry about
// those if somebody expresses a desire to use them.
x = (x - vwidth * 0.5) * Width * 960 / (vwidth * BaseRatioSizes[myratio][0]) + Width * 0.5;
w = (right - vwidth * 0.5) * Width * 960 / (vwidth * BaseRatioSizes[myratio][0]) + Width * 0.5 - x;
}
else
{
x = x * Width / vwidth;
w = right * Width / vwidth - x;
}
if (myratio == 4)
{ // The target surface is 5:4
y = (y - vheight * 0.5) * Height * 600 / (vheight * BaseRatioSizes[myratio][1]) + Height * 0.5;
h = (bottom - vheight * 0.5) * Height * 600 / (vheight * BaseRatioSizes[myratio][1]) + Height * 0.5 - y;
if (vbottom)
{
y += (Height - Height * BaseRatioSizes[myratio][3] / 48.0) * 0.5;
}
}
else
{
y = y * Height / vheight;
h = bottom * Height / vheight - y;
}
}
void DCanvas::VirtualToRealCoordsFixed(fixed_t &x, fixed_t &y, fixed_t &w, fixed_t &h,
int vwidth, int vheight, bool vbottom, bool handleaspect) const
{
double dx, dy, dw, dh;
dx = FIXED2FLOAT(x);
dy = FIXED2FLOAT(y);
dw = FIXED2FLOAT(w);
dh = FIXED2FLOAT(h);
VirtualToRealCoords(dx, dy, dw, dh, vwidth, vheight, vbottom, handleaspect);
x = FLOAT2FIXED(dx);
y = FLOAT2FIXED(dy);
w = FLOAT2FIXED(dw);
h = FLOAT2FIXED(dh);
}
void DCanvas::VirtualToRealCoordsInt(int &x, int &y, int &w, int &h,
int vwidth, int vheight, bool vbottom, bool handleaspect) const
{
double dx, dy, dw, dh;
dx = x;
dy = y;
dw = w;
dh = h;
VirtualToRealCoords(dx, dy, dw, dh, vwidth, vheight, vbottom, handleaspect);
x = int(dx + 0.5);
y = int(dy + 0.5);
w = int(dx + dw + 0.5) - x;
h = int(dy + dh + 0.5) - y;
}
void DCanvas::FillBorder (FTexture *img)
{
int myratio = CheckRatio (Width, Height);
if (myratio == 0)
{ // This is a 4:3 display, so no border to show
return;
}
int bordtop, bordbottom, bordleft, bordright, bord;
if (myratio & 4)
{ // Screen is taller than it is wide
bordleft = bordright = 0;
bord = Height - Height * BaseRatioSizes[myratio][3] / 48;
bordtop = bord / 2;
bordbottom = bord - bordtop;
}
else
{ // Screen is wider than it is tall
bordtop = bordbottom = 0;
bord = Width - Width * BaseRatioSizes[myratio][3] / 48;
bordleft = bord / 2;
bordright = bord - bordleft;
}
if (img != NULL)
{
FlatFill (0, 0, Width, bordtop, img); // Top
FlatFill (0, bordtop, bordleft, Height - bordbottom, img); // Left
FlatFill (Width - bordright, bordtop, Width, Height - bordbottom, img); // Right
FlatFill (0, Height - bordbottom, Width, Height, img); // Bottom
}
else
{
Clear (0, 0, Width, bordtop, 0, 0); // Top
Clear (0, bordtop, bordleft, Height - bordbottom, 0, 0); // Left
Clear (Width - bordright, bordtop, Width, Height - bordbottom, 0, 0); // Right
Clear (0, Height - bordbottom, Width, Height, 0, 0); // Bottom
}
}
void DCanvas::PUTTRANSDOT (int xx, int yy, int basecolor, int level)
{
static int oldyy;
static int oldyyshifted;
#if 0
if(xx < 32)
cc += 7-(xx>>2);
else if(xx > (finit_width - 32))
cc += 7-((finit_width-xx) >> 2);
// if(cc==oldcc) //make sure that we don't double fade the corners.
// {
if(yy < 32)
cc += 7-(yy>>2);
else if(yy > (finit_height - 32))
cc += 7-((finit_height-yy) >> 2);
// }
if(cc > cm && cm != NULL)
{
cc = cm;
}
else if(cc > oldcc+6) // don't let the color escape from the fade table...
{
cc=oldcc+6;
}
#endif
if (yy == oldyy+1)
{
oldyy++;
oldyyshifted += GetPitch();
}
else if (yy == oldyy-1)
{
oldyy--;
oldyyshifted -= GetPitch();
}
else if (yy != oldyy)
{
oldyy = yy;
oldyyshifted = yy * GetPitch();
}
BYTE *spot = GetBuffer() + oldyyshifted + xx;
DWORD *bg2rgb = Col2RGB8[1+level];
DWORD *fg2rgb = Col2RGB8[63-level];
DWORD fg = fg2rgb[basecolor];
DWORD bg = bg2rgb[*spot];
bg = (fg+bg) | 0x1f07c1f;
*spot = RGB32k[0][0][bg&(bg>>15)];
}
void DCanvas::DrawLine(int x0, int y0, int x1, int y1, int palColor, uint32 realcolor)
//void DrawTransWuLine (int x0, int y0, int x1, int y1, BYTE palColor)
{
const int WeightingScale = 0;
const int WEIGHTBITS = 6;
const int WEIGHTSHIFT = 16-WEIGHTBITS;
const int NUMWEIGHTS = (1<<WEIGHTBITS);
const int WEIGHTMASK = (NUMWEIGHTS-1);
if (palColor < 0)
{
palColor = PalFromRGB(realcolor);
}
Lock();
int deltaX, deltaY, xDir;
if (y0 > y1)
{
int temp = y0; y0 = y1; y1 = temp;
temp = x0; x0 = x1; x1 = temp;
}
PUTTRANSDOT (x0, y0, palColor, 0);
if ((deltaX = x1 - x0) >= 0)
{
xDir = 1;
}
else
{
xDir = -1;
deltaX = -deltaX;
}
if ((deltaY = y1 - y0) == 0)
{ // horizontal line
if (x0 > x1)
{
swap (x0, x1);
}
memset (GetBuffer() + y0*GetPitch() + x0, palColor, deltaX+1);
}
else if (deltaX == 0)
{ // vertical line
BYTE *spot = GetBuffer() + y0*GetPitch() + x0;
int pitch = GetPitch ();
do
{
*spot = palColor;
spot += pitch;
} while (--deltaY != 0);
}
else if (deltaX == deltaY)
{ // diagonal line.
BYTE *spot = GetBuffer() + y0*GetPitch() + x0;
int advance = GetPitch() + xDir;
do
{
*spot = palColor;
spot += advance;
} while (--deltaY != 0);
}
else
{
// line is not horizontal, diagonal, or vertical
fixed_t errorAcc = 0;
if (deltaY > deltaX)
{ // y-major line
fixed_t errorAdj = (((unsigned)deltaX << 16) / (unsigned)deltaY) & 0xffff;
if (xDir < 0)
{
if (WeightingScale == 0)
{
while (--deltaY)
{
errorAcc += errorAdj;
y0++;
int weighting = (errorAcc >> WEIGHTSHIFT) & WEIGHTMASK;
PUTTRANSDOT (x0 - (errorAcc >> 16), y0, palColor, weighting);
PUTTRANSDOT (x0 - (errorAcc >> 16) - 1, y0,
palColor, WEIGHTMASK - weighting);
}
}
else
{
while (--deltaY)
{
errorAcc += errorAdj;
y0++;
int weighting = ((errorAcc * WeightingScale) >> (WEIGHTSHIFT+8)) & WEIGHTMASK;
PUTTRANSDOT (x0 - (errorAcc >> 16), y0, palColor, weighting);
PUTTRANSDOT (x0 - (errorAcc >> 16) - 1, y0,
palColor, WEIGHTMASK - weighting);
}
}
}
else
{
if (WeightingScale == 0)
{
while (--deltaY)
{
errorAcc += errorAdj;
y0++;
int weighting = (errorAcc >> WEIGHTSHIFT) & WEIGHTMASK;
PUTTRANSDOT (x0 + (errorAcc >> 16), y0, palColor, weighting);
PUTTRANSDOT (x0 + (errorAcc >> 16) + xDir, y0,
palColor, WEIGHTMASK - weighting);
}
}
else
{
while (--deltaY)
{
errorAcc += errorAdj;
y0++;
int weighting = ((errorAcc * WeightingScale) >> (WEIGHTSHIFT+8)) & WEIGHTMASK;
PUTTRANSDOT (x0 + (errorAcc >> 16), y0, palColor, weighting);
PUTTRANSDOT (x0 + (errorAcc >> 16) + xDir, y0,
palColor, WEIGHTMASK - weighting);
}
}
}
}
else
{ // x-major line
fixed_t errorAdj = (((DWORD) deltaY << 16) / (DWORD) deltaX) & 0xffff;
if (WeightingScale == 0)
{
while (--deltaX)
{
errorAcc += errorAdj;
x0 += xDir;
int weighting = (errorAcc >> WEIGHTSHIFT) & WEIGHTMASK;
PUTTRANSDOT (x0, y0 + (errorAcc >> 16), palColor, weighting);
PUTTRANSDOT (x0, y0 + (errorAcc >> 16) + 1,
palColor, WEIGHTMASK - weighting);
}
}
else
{
while (--deltaX)
{
errorAcc += errorAdj;
x0 += xDir;
int weighting = ((errorAcc * WeightingScale) >> (WEIGHTSHIFT+8)) & WEIGHTMASK;
PUTTRANSDOT (x0, y0 + (errorAcc >> 16), palColor, weighting);
PUTTRANSDOT (x0, y0 + (errorAcc >> 16) + 1,
palColor, WEIGHTMASK - weighting);
}
}
}
PUTTRANSDOT (x1, y1, palColor, 0);
}
Unlock();
}
void DCanvas::DrawPixel(int x, int y, int palColor, uint32 realcolor)
{
if (palColor < 0)
{
palColor = PalFromRGB(realcolor);
}
Buffer[Pitch * y + x] = (BYTE)palColor;
}
//==========================================================================
//
// DCanvas :: Clear
//
// Set an area to a specified color.
//
//==========================================================================
void DCanvas::Clear (int left, int top, int right, int bottom, int palcolor, uint32 color)
{
int x, y;
BYTE *dest;
if (left == right || top == bottom)
{
return;
}
assert(left < right);
assert(top < bottom);
if (palcolor < 0)
{
if (APART(color) != 255)
{
Dim(color, APART(color)/255.f, left, top, right - left, bottom - top);
return;
}
palcolor = PalFromRGB(color);
}
dest = Buffer + top * Pitch + left;
x = right - left;
for (y = top; y < bottom; y++)
{
memset(dest, palcolor, x);
dest += Pitch;
}
}
/********************************/
/* */
/* Other miscellaneous routines */
/* */
/********************************/
//
// V_DrawBlock
// Draw a linear block of pixels into the view buffer.
//
void DCanvas::DrawBlock (int x, int y, int _width, int _height, const BYTE *src) const
{
int srcpitch = _width;
int destpitch;
BYTE *dest;
if (ClipBox (x, y, _width, _height, src, srcpitch))
{
return; // Nothing to draw
}
destpitch = Pitch;
dest = Buffer + y*Pitch + x;
do
{
memcpy (dest, src, _width);
src += srcpitch;
dest += destpitch;
} while (--_height);
}
//
// V_GetBlock
// Gets a linear block of pixels from the view buffer.
//
void DCanvas::GetBlock (int x, int y, int _width, int _height, BYTE *dest) const
{
const BYTE *src;
#ifdef RANGECHECK
if (x<0
||x+_width > Width
|| y<0
|| y+_height>Height)
{
I_Error ("Bad V_GetBlock");
}
#endif
src = Buffer + y*Pitch + x;
while (_height--)
{
memcpy (dest, src, _width);
src += Pitch;
dest += _width;
}
}
// Returns true if the box was completely clipped. False otherwise.
bool DCanvas::ClipBox (int &x, int &y, int &w, int &h, const BYTE *&src, const int srcpitch) const
{
if (x >= Width || y >= Height || x+w <= 0 || y+h <= 0)
{ // Completely clipped off screen
return true;
}
if (x < 0) // clip left edge
{
src -= x;
w += x;
x = 0;
}
if (x+w > Width) // clip right edge
{
w = Width - x;
}
if (y < 0) // clip top edge
{
src -= y*srcpitch;
h += y;
y = 0;
}
if (y+h > Height) // clip bottom edge
{
h = Height - y;
}
return false;
}
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