Magic-Mirror/gecko-dev
1
0
Fork 0
mirror of https://github.com/mozilla/gecko-dev.git synced 2024-11-08 20:47:44 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
c89b1af446
gecko-dev/gfx/src/nsBlender.cpp

1076 lines
32 KiB
C++
Raw Blame History

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the NPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsBlender.h"
#include "nsIDeviceContext.h"
#include "nsCRT.h"
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
nsBlender :: nsBlender()
{
NS_INIT_REFCNT();
mContext = nsnull;
}
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
nsBlender::~nsBlender()
{
NS_IF_RELEASE(mContext);
}
NS_IMPL_ISUPPORTS1(nsBlender, nsIBlender);
//------------------------------------------------------------
// need to set up some masks for 16 bit blending
// Use compile-time constants where possible for marginally smaller
// footprint (don't need fields in nsBlender) but also for faster code
#if defined(XP_MAC) || defined(XP_MACOSX)
#define BLEND_RED_MASK 0x7c00
#define BLEND_GREEN_MASK 0x03e0
#define BLEND_BLUE_MASK 0x001f
#define BLEND_RED_SET_MASK 0xf8
#define BLEND_GREEN_SET_MASK 0xf8
#define BLEND_BLUE_SET_MASK 0xf8
#define BLEND_RED_SHIFT 7
#define BLEND_GREEN_SHIFT 2
#define BLEND_BLUE_SHIFT 3
#else // XP_WIN, XP_UNIX, ???
#define BLEND_RED_MASK 0xf800
#define BLEND_GREEN_MASK 0x07e0
#define BLEND_BLUE_MASK 0x001f
#define BLEND_RED_SET_MASK 0xf8
#define BLEND_GREEN_SET_MASK 0xfC
#define BLEND_BLUE_SET_MASK 0xf8
#define BLEND_RED_SHIFT 8
#define BLEND_GREEN_SHIFT 3
#define BLEND_BLUE_SHIFT 3
#endif
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
NS_IMETHODIMP
nsBlender::Init(nsIDeviceContext *aContext)
{
mContext = aContext;
NS_IF_ADDREF(mContext);
return NS_OK;
}
static void rangeCheck(nsIDrawingSurface* surface, PRInt32& aX, PRInt32& aY, PRInt32& aWidth, PRInt32& aHeight)
{
PRUint32 width, height;
surface->GetDimensions(&width, &height);
// ensure that the origin is within bounds of the drawing surface.
if (aX < 0)
aX = 0;
else if (aX > (PRInt32)width)
aX = width;
if (aY < 0)
aY = 0;
else if (aY > (PRInt32)height)
aY = height;
// ensure that the dimensions are within bounds.
if (aX + aWidth > (PRInt32)width)
aWidth = width - aX;
if (aY + aHeight > (PRInt32)height)
aHeight = height - aY;
}
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
NS_IMETHODIMP
nsBlender::Blend(PRInt32 aSX, PRInt32 aSY, PRInt32 aWidth, PRInt32 aHeight, nsDrawingSurface aSrc,
nsDrawingSurface aDst, PRInt32 aDX, PRInt32 aDY, float aSrcOpacity,
nsDrawingSurface aSecondSrc, nscolor aSrcBackColor,
nscolor aSecondSrcBackColor)
{
if (aSecondSrc) {
// the background color options are obsolete and should be removed.
NS_ASSERTION(aSrcBackColor == NS_RGB(0, 0, 0),
"Background color for primary source must be black");
NS_ASSERTION(aSecondSrcBackColor == NS_RGB(255, 255, 255),
"Background color for secondary source must be white");
if (aSrcBackColor != NS_RGB(0, 0, 0) ||
aSecondSrcBackColor != NS_RGB(255, 255, 255)) {
// disable multi-buffer blending; pretend the primary buffer
// is all opaque pixels
aSecondSrc = nsnull;
}
}
nsresult result = NS_ERROR_FAILURE;
nsIDrawingSurface* srcSurface = (nsIDrawingSurface *)aSrc;
nsIDrawingSurface* destSurface = (nsIDrawingSurface *)aDst;
nsIDrawingSurface* secondSrcSurface = (nsIDrawingSurface *)aSecondSrc;
// range check the coordinates in both the source and destination buffers.
rangeCheck(srcSurface, aSX, aSY, aWidth, aHeight);
rangeCheck(destSurface, aDX, aDY, aWidth, aHeight);
PRUint8* srcBytes = nsnull;
PRUint8* secondSrcBytes = nsnull;
PRUint8* destBytes = nsnull;
PRInt32 srcSpan, destSpan, secondSrcSpan;
PRInt32 srcRowBytes, destRowBytes, secondSrcRowBytes;
if (NS_OK == srcSurface->Lock(aSX, aSY, aWidth, aHeight, (void**)&srcBytes, &srcRowBytes, &srcSpan, NS_LOCK_SURFACE_READ_ONLY)) {
if (NS_OK == destSurface->Lock(aDX, aDY, aWidth, aHeight, (void**)&destBytes, &destRowBytes, &destSpan, 0)) {
NS_ASSERTION(srcSpan == destSpan, "Mismatched bitmap formats (src/dest) in Blender");
if (srcSpan == destSpan) {
if (secondSrcSurface) {
if (NS_OK == secondSrcSurface->Lock(aSX, aSY, aWidth, aHeight, (void**)&secondSrcBytes, &secondSrcRowBytes, &secondSrcSpan, NS_LOCK_SURFACE_READ_ONLY)) {
NS_ASSERTION(srcSpan == secondSrcSpan && srcRowBytes == secondSrcRowBytes,
"Mismatched bitmap formats (src/secondSrc) in Blender");
if (srcSpan != secondSrcSpan || srcRowBytes != secondSrcRowBytes) {
// disable second source if there's a format mismatch
secondSrcBytes = nsnull;
}
} else {
// failed to lock. So, pretend it was never there.
secondSrcSurface = nsnull;
secondSrcBytes = nsnull;
}
}
result = Blend(srcBytes, srcRowBytes,
destBytes, destRowBytes,
secondSrcBytes,
srcSpan, aHeight, aSrcOpacity);
if (secondSrcSurface) {
secondSrcSurface->Unlock();
}
}
destSurface->Unlock();
}
srcSurface->Unlock();
}
return result;
}
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
NS_IMETHODIMP nsBlender::Blend(PRInt32 aSX, PRInt32 aSY, PRInt32 aWidth, PRInt32 aHeight, nsIRenderingContext *aSrc,
nsIRenderingContext *aDest, PRInt32 aDX, PRInt32 aDY, float aSrcOpacity,
nsIRenderingContext *aSecondSrc, nscolor aSrcBackColor,
nscolor aSecondSrcBackColor)
{
// just hand off to the drawing surface blender, to make code easier to maintain.
nsDrawingSurface srcSurface, destSurface, secondSrcSurface = nsnull;
aSrc->GetDrawingSurface(&srcSurface);
aDest->GetDrawingSurface(&destSurface);
if (aSecondSrc != nsnull)
aSecondSrc->GetDrawingSurface(&secondSrcSurface);
return Blend(aSX, aSY, aWidth, aHeight, srcSurface, destSurface,
aDX, aDY, aSrcOpacity, secondSrcSurface, aSrcBackColor,
aSecondSrcBackColor);
}
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
nsresult nsBlender::Blend(PRUint8 *aSrcBits, PRInt32 aSrcStride,
PRUint8 *aDestBits, PRInt32 aDestStride,
PRUint8 *aSecondSrcBits,
PRInt32 aSrcBytes, PRInt32 aLines, float aOpacity)
{
nsresult result = NS_OK;
PRUint32 depth;
mContext->GetDepth(depth);
// now do the blend
switch (depth){
case 32:
Do32Blend(aOpacity, aLines, aSrcBytes, aSrcBits, aDestBits,
aSecondSrcBits, aSrcStride, aDestStride, nsHighQual);
break;
case 24:
Do24Blend(aOpacity, aLines, aSrcBytes, aSrcBits, aDestBits,
aSecondSrcBits, aSrcStride, aDestStride, nsHighQual);
break;
case 16:
Do16Blend(aOpacity, aLines, aSrcBytes, aSrcBits, aDestBits,
aSecondSrcBits, aSrcStride, aDestStride, nsHighQual);
break;
case 8:
{
#if 0
IL_ColorSpace *thespace = nsnull;
if ((result = mContext->GetILColorSpace(thespace)) == NS_OK) {
Do8Blend(aOpacity, aLines, aSrcBytes, aSrcBits, aDestBits,
aSecondSrcBits, aSrcStride, aDestStride, thespace,
nsHighQual);
IL_ReleaseColorSpace(thespace);
}
#endif
break;
}
}
return result;
}
/**
This is the simple case where the opacity == 1.0. We just copy the pixels.
*/
static void DoOpaqueBlend(PRInt32 aNumLines, PRInt32 aNumBytes,
PRUint8 *aSImage, PRUint8 *aDImage,
PRInt32 aSLSpan, PRInt32 aDLSpan)
{
PRIntn y;
for (y = 0; y < aNumLines; y++) {
memcpy(aDImage, aSImage, aNumBytes);
aSImage += aSLSpan;
aDImage += aDLSpan;
}
}
/**
This is the case where we have a single source buffer, all of whose
pixels have an alpha value of 1.0.
Here's how to get the formula for calculating new destination pixels:
There's a destination pixel whose current color is D (0 <= D <= 255).
We are required to find the new color value for the destination pixel, call it X.
We are given S, the color value of the source pixel (0 <= S <= 255).
We are also given P, the opacity to blend with (0 < P < 256).
Note that we have deliberately defined P's "opaque" range bound to be 256
and not 255. This considerably speeds up the code.
Then we have the equation
X = D*(1 - P/256) + S*(P/256)
Rearranging gives
X = D + ((S - D)*P)/256
This form minimizes the number of integer multiplications, which are much more
expensive than shifts, adds and subtractions on most processors.
*/
static void DoSingleImageBlend(PRUint32 aOpacity256, PRInt32 aNumLines, PRInt32 aNumBytes,
PRUint8 *aSImage, PRUint8 *aDImage,
PRInt32 aSLSpan, PRInt32 aDLSpan)
{
PRIntn y;
for (y = 0; y < aNumLines; y++) {
PRUint8 *s2 = aSImage;
PRUint8 *d2 = aDImage;
PRIntn i;
for (i = 0; i < aNumBytes; i++) {
PRUint32 destPix = *d2;
*d2 = (PRUint8)(destPix + (((*s2 - destPix)*aOpacity256) >> 8));
d2++;
s2++;
}
aSImage += aSLSpan;
aDImage += aDLSpan;
}
}
/**
After disposing of the simpler cases, here we have two source buffers.
So here's how to get the formula for calculating new destination pixels:
If the source pixel is the same in each buffer, then the pixel was painted with
alpha=1.0 and we use the formula from above to compute the destination pixel.
However, if the source pixel is different in each buffer (and is not just the
background color for each buffer, which indicates alpha=0.0), then the pixel was
painted with some partial alpha value and we need to (at least implicitly) recover
that alpha value along with the actual color value. So...
There's a destination pixel whose current color is D (0 <= D <= 255).
We are required to find the new color value for the destination pixel, call it X.
We are given S, the color value of the source pixel painted onto black (0 <= S <= 255).
We are given T, the color value of the source pixel painted onto white (0 <= T <= 255).
We are also given P, the opacity to blend with (0 < P < 256).
Let A be the alpha value the source pixel was painted with (0 <= A <= 255).
Let C be the color value of the source pixel (0 <= C <= 255).
Note that even though (as above) we set the "opaque" range bound for P at 256,
we set the "opaque" range bound for A at 255. This turns out to simplify the formulae
and speed up the code.
Then we have the equations
S = C*(A/255)
T = 255*(1 - A/255) + C*(A/255)
X = D*(1 - (A/255)*(P/256)) + C*(A/255)*(P/256)
Rearranging and crunching the algebra gives
X = D + ((S - (D*(255 + S - T))/255)*P)/256
This is the simplest form I could find. Apart from the two integer multiplies,
which I think are minimal, the most troublesome part is the division by 255,
but I have a fast way to do that (for numbers in the range encountered) using
two adds and two shifts.
*/
void
nsBlender::Do32Blend(float aOpacity, PRInt32 aNumLines, PRInt32 aNumBytes,
PRUint8 *aSImage, PRUint8 *aDImage, PRUint8 *aSecondSImage,
PRInt32 aSLSpan, PRInt32 aDLSpan, nsBlendQuality aBlendQuality)
{
/* Use alpha ranging from 0 to 256 inclusive. This means that we get accurate
results when we divide by 256. */
PRUint32 opacity256 = (PRUint32)(aOpacity*256);
// Handle simpler cases
if (opacity256 <= 0) {
return;
} else if (opacity256 >= 256) {
DoOpaqueBlend(aNumLines, aNumBytes, aSImage, aDImage, aSLSpan, aDLSpan);
return;
} else if (nsnull == aSecondSImage) {
DoSingleImageBlend(opacity256, aNumLines, aNumBytes, aSImage, aDImage, aSLSpan, aDLSpan);
return;
}
PRIntn numPixels = aNumBytes/4;
PRIntn y;
for (y = 0; y < aNumLines; y++) {
PRUint8 *s2 = aSImage;
PRUint8 *d2 = aDImage;
PRUint8 *ss2 = aSecondSImage;
PRIntn x;
for (x = 0; x < numPixels; x++) {
PRUint32 pixSColor = *((PRUint32*)(s2))&0xFFFFFF;
PRUint32 pixSSColor = *((PRUint32*)(ss2))&0xFFFFFF;
if ((pixSColor != 0x000000) || (pixSSColor != 0xFFFFFF)) {
if (pixSColor != pixSSColor) {
PRIntn i;
// the original source pixel was alpha-blended into the background.
// We have to extract the original alpha and color value.
for (i = 0; i < 4; i++) {
PRUint32 destPix = *d2;
PRUint32 onBlack = *s2;
PRUint32 imageAlphaTimesDestPix = (255 + onBlack - *ss2)*destPix;
PRUint32 adjustedDestPix;
FAST_DIVIDE_BY_255(adjustedDestPix, imageAlphaTimesDestPix);
*d2 = (PRUint8)(destPix + (((onBlack - adjustedDestPix)*opacity256) >> 8));
d2++;
s2++;
ss2++;
}
} else {
PRIntn i;
for (i = 0; i < 4; i++) {
PRUint32 destPix = *d2;
PRUint32 onBlack = *s2;
*d2 = (PRUint8)(destPix + (((onBlack - destPix)*opacity256) >> 8));
d2++;
s2++;
}
ss2 += 4;
}
} else {
d2 += 4;
s2 += 4;
ss2 += 4;
}
}
aSImage += aSLSpan;
aDImage += aDLSpan;
aSecondSImage += aSLSpan;
}
}
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
void
nsBlender::Do24Blend(float aOpacity, PRInt32 aNumLines, PRInt32 aNumBytes,
PRUint8 *aSImage, PRUint8 *aDImage, PRUint8 *aSecondSImage,
PRInt32 aSLSpan, PRInt32 aDLSpan, nsBlendQuality aBlendQuality)
{
/* Use alpha ranging from 0 to 256 inclusive. This means that we get accurate
results when we divide by 256. */
PRUint32 opacity256 = (PRUint32)(aOpacity*256);
// Handle simpler cases
if (opacity256 <= 0) {
return;
} else if (opacity256 >= 256) {
DoOpaqueBlend(aNumLines, aNumBytes, aSImage, aDImage, aSLSpan, aDLSpan);
return;
} else if (nsnull == aSecondSImage) {
DoSingleImageBlend(opacity256, aNumLines, aNumBytes, aSImage, aDImage, aSLSpan, aDLSpan);
return;
}
PRIntn numPixels = aNumBytes/3;
PRIntn y;
for (y = 0; y < aNumLines; y++) {
PRUint8 *s2 = aSImage;
PRUint8 *d2 = aDImage;
PRUint8 *ss2 = aSecondSImage;
PRIntn x;
for (x = 0; x < numPixels; x++) {
PRUint32 pixSColor = s2[0] | (s2[1] << 8) | (s2[2] << 16);
PRUint32 pixSSColor = ss2[0] | (ss2[1] << 8) | (ss2[2] << 16);
if ((pixSColor != 0x000000) || (pixSSColor != 0xFFFFFF)) {
if (pixSColor != pixSSColor) {
PRIntn i;
// the original source pixel was alpha-blended into the background.
// We have to extract the original alpha and color value.
for (i = 0; i < 3; i++) {
PRUint32 destPix = *d2;
PRUint32 onBlack = *s2;
PRUint32 imageAlphaTimesDestPix = (255 + onBlack - *ss2)*destPix;
PRUint32 adjustedDestPix;
FAST_DIVIDE_BY_255(adjustedDestPix, imageAlphaTimesDestPix);
*d2 = (PRUint8)(destPix + (((onBlack - adjustedDestPix)*opacity256) >> 8));
d2++;
s2++;
ss2++;
}
} else {
PRIntn i;
for (i = 0; i < 3; i++) {
PRUint32 destPix = *d2;
PRUint32 onBlack = *s2;
*d2 = (PRUint8)(destPix + (((onBlack - destPix)*opacity256) >> 8));
d2++;
s2++;
}
ss2 += 3;
}
} else {
d2 += 3;
s2 += 3;
ss2 += 3;
}
}
aSImage += aSLSpan;
aDImage += aDLSpan;
aSecondSImage += aSLSpan;
}
}
//------------------------------------------------------------
#define RED16(x) (((x) & BLEND_RED_MASK) >> BLEND_RED_SHIFT)
#define GREEN16(x) (((x) & BLEND_GREEN_MASK) >> BLEND_GREEN_SHIFT)
#define BLUE16(x) (((x) & BLEND_BLUE_MASK) << BLEND_BLUE_SHIFT)
#define MAKE16(r, g, b) \
(PRUint16)(((r) & BLEND_RED_SET_MASK) << BLEND_RED_SHIFT) \
| (((g) & BLEND_GREEN_SET_MASK) << BLEND_GREEN_SHIFT) \
| (((b) & BLEND_BLUE_SET_MASK) >> BLEND_BLUE_SHIFT)
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
void
nsBlender::Do16Blend(float aOpacity, PRInt32 aNumLines, PRInt32 aNumBytes,
PRUint8 *aSImage, PRUint8 *aDImage, PRUint8 *aSecondSImage,
PRInt32 aSLSpan, PRInt32 aDLSpan, nsBlendQuality aBlendQuality)
{
PRUint32 opacity256 = (PRUint32)(aOpacity*256);
// Handle simpler cases
if (opacity256 <= 0) {
return;
} else if (opacity256 >= 256) {
DoOpaqueBlend(aNumLines, aNumBytes, aSImage, aDImage, aSLSpan, aDLSpan);
return;
}
PRIntn numPixels = aNumBytes/2;
if (nsnull == aSecondSImage) {
PRIntn y;
for (y = 0; y < aNumLines; y++) {
PRUint16 *s2 = (PRUint16*)aSImage;
PRUint16 *d2 = (PRUint16*)aDImage;
PRIntn i;
for (i = 0; i < numPixels; i++) {
PRUint32 destPix = *d2;
PRUint32 destPixR = RED16(destPix);
PRUint32 destPixG = GREEN16(destPix);
PRUint32 destPixB = BLUE16(destPix);
PRUint32 srcPix = *s2;
*d2 = MAKE16(destPixR + (((RED16(srcPix) - destPixR)*opacity256) >> 8),
destPixG + (((GREEN16(srcPix) - destPixG)*opacity256) >> 8),
destPixB + (((BLUE16(srcPix) - destPixB)*opacity256) >> 8));
d2++;
s2++;
}
aSImage += aSLSpan;
aDImage += aDLSpan;
}
return;
}
PRUint32 srcBackgroundColor = MAKE16(0x00, 0x00, 0x00);
PRUint32 src2BackgroundColor = MAKE16(0xFF, 0xFF, 0xFF);
PRIntn y;
for (y = 0; y < aNumLines; y++) {
PRUint16 *s2 = (PRUint16*)aSImage;
PRUint16 *d2 = (PRUint16*)aDImage;
PRUint16 *ss2 = (PRUint16*)aSecondSImage;
PRIntn x;
for (x = 0; x < numPixels; x++) {
PRUint32 srcPix = *s2;
PRUint32 src2Pix = *ss2;
if ((srcPix != srcBackgroundColor) || (src2Pix != src2BackgroundColor)) {
PRUint32 destPix = *d2;
PRUint32 destPixR = RED16(destPix);
PRUint32 destPixG = GREEN16(destPix);
PRUint32 destPixB = BLUE16(destPix);
PRUint32 srcPixR = RED16(srcPix);
PRUint32 srcPixG = GREEN16(srcPix);
PRUint32 srcPixB = BLUE16(srcPix);
if (srcPix != src2Pix) {
PRUint32 imageAlphaTimesDestPixR = (255 + srcPixR - RED16(src2Pix))*destPixR;
PRUint32 imageAlphaTimesDestPixG = (255 + srcPixG - GREEN16(src2Pix))*destPixG;
PRUint32 imageAlphaTimesDestPixB = (255 + srcPixB - BLUE16(src2Pix))*destPixB;
PRUint32 adjustedDestPixR;
FAST_DIVIDE_BY_255(adjustedDestPixR, imageAlphaTimesDestPixR);
PRUint32 adjustedDestPixG;
FAST_DIVIDE_BY_255(adjustedDestPixG, imageAlphaTimesDestPixG);
PRUint32 adjustedDestPixB;
FAST_DIVIDE_BY_255(adjustedDestPixB, imageAlphaTimesDestPixB);
*d2 = MAKE16(destPixR + (((srcPixR - adjustedDestPixR)*opacity256) >> 8),
destPixG + (((srcPixG - adjustedDestPixG)*opacity256) >> 8),
destPixB + (((srcPixB - adjustedDestPixB)*opacity256) >> 8));
} else {
*d2 = MAKE16(destPixR + (((srcPixR - destPixR)*opacity256) >> 8),
destPixG + (((srcPixG - destPixG)*opacity256) >> 8),
destPixB + (((srcPixB - destPixB)*opacity256) >> 8));
}
}
d2++;
s2++;
ss2++;
}
aSImage += aSLSpan;
aDImage += aDLSpan;
aSecondSImage += aSLSpan;
}
}
//------------------------------------------------------------
extern void inv_colormap(PRInt16 colors,PRUint8 *aCMap,PRInt16 bits,PRUint32 *dist_buf,PRUint8 *aRGBMap );
/** ---------------------------------------------------
* See documentation in nsBlender.h
* @update 2/25/00 dwc
*/
void
nsBlender::Do8Blend(float aOpacity, PRInt32 aNumlines, PRInt32 aNumbytes,
PRUint8 *aSImage, PRUint8 *aDImage, PRUint8 *aSecondSImage,
PRInt32 aSLSpan, PRInt32 aDLSpan, IL_ColorSpace *aColorMap,
nsBlendQuality aBlendQuality)
{
#if 0
PRUint32 r,g,b,r1,g1,b1,i;
PRUint8 *d1,*d2,*s1,*s2;
PRInt32 x,y,val1,val2,numlines;
PRUint8 *mapptr,*invermap;
PRUint32 *distbuffer;
PRUint32 quantlevel,tnum,num,shiftnum;
NI_RGB *map;
if (nsnull == aColorMap->cmap.map) {
NS_ASSERTION(PR_FALSE, "NULL Colormap during 8-bit blend");
return;
}
val2 = (PRUint8)(aOpacity*255);
val1 = 255-val2;
// build a colormap we can use to get an inverse map
map = aColorMap->cmap.map+10;
mapptr = new PRUint8[256*3];
invermap = mapptr;
for(i=0;i<216;i++){
*invermap=map->blue;
invermap++;
*invermap=map->green;
invermap++;
*invermap=map->red;
invermap++;
map++;
}
for(i=216;i<256;i++){
*invermap=0;
invermap++;
*invermap=0;
invermap++;
*invermap=0;
invermap++;
}
quantlevel = aBlendQuality+2;
quantlevel = 4; // 4 5
shiftnum = (8-quantlevel)+8; // 12 11
tnum = 2; // 2 2
for(i=1;i<=quantlevel;i++)
tnum = 2*tnum; // 2, 4, 8, tnum = 16 32
num = tnum; // num = 16 32
for(i=1;i<3;i++)
num = num*tnum; // 256, 4096 32768
distbuffer = new PRUint32[num]; // new PRUint[4096] 32768
invermap = new PRUint8[num];
inv_colormap(216,mapptr,quantlevel,distbuffer,invermap ); // 216,mapptr[],4,distbuffer[4096],invermap[12288])
// now go thru the image and blend (remember, its bottom upwards)
s1 = aSImage;
d1 = aDImage;
numlines = aNumlines;
for(y = 0; y < aNumlines; y++){
s2 = s1;
d2 = d1;
for(x = 0; x < aNumbytes; x++){
i = (*d2);
i-=10;
r = mapptr[(3 * i) + 2];
g = mapptr[(3 * i) + 1];
b = mapptr[(3 * i)];
i =(*s2);
i-=10;
r1 = mapptr[(3 * i) + 2];
g1 = mapptr[(3 * i) + 1];
b1 = mapptr[(3 * i)];
r = ((r*val1)+(r1*val2))>>shiftnum;
//r=r>>quantlevel;
if(r>tnum)
r = tnum;
g = ((g*val1)+(g1*val2))>>shiftnum;
//g=g>>quantlevel;
if(g>tnum)
g = tnum;
b = ((b*val1)+(b1*val2))>>shiftnum;
//b=b>>quantlevel;
if(b>tnum)
b = tnum;
r = (r<<(2*quantlevel))+(g<<quantlevel)+b;
r = (invermap[r]+10);
(*d2)=r;
d2++;
s2++;
}
s1 += aSLSpan;
d1 += aDLSpan;
}
delete[] distbuffer;
delete[] invermap;
#endif
}
//------------------------------------------------------------
static PRInt32 bcenter, gcenter, rcenter;
static PRUint32 gdist, rdist, cdist;
static PRInt32 cbinc, cginc, crinc;
static PRUint32 *gdp, *rdp, *cdp;
static PRUint8 *grgbp, *rrgbp, *crgbp;
static PRInt32 gstride, rstride;
static PRInt32 x, xsqr, colormax;
static PRInt32 cindex;
static void maxfill(PRUint32 *buffer,PRInt32 side );
static PRInt32 redloop( void );
static PRInt32 greenloop( PRInt32 );
static PRInt32 blueloop( PRInt32 );
/** --------------------------------------------------------------------------
* Create an inverse colormap for a given color table
* @param colors -- Number of colors
* @param aCMap -- The color map
* @param aBits -- Resolution in bits for the inverse map
* @param dist_buf -- a buffer to hold the temporary colors in while we calculate the map
* @param aRGBMap -- the map to put the inverse colors into for the color table
* @return VOID
*/
void
inv_colormap(PRInt16 aNumColors,PRUint8 *aCMap,PRInt16 aBits,PRUint32 *dist_buf,PRUint8 *aRGBMap )
{
PRInt32 nbits = 8 - aBits; // 3
PRUint32 r,g,b;
colormax = 1 << aBits; // 32
x = 1 << nbits; // 8
xsqr = 1 << (2 * nbits); // 64
// Compute "strides" for accessing the arrays
gstride = colormax; // 32
rstride = colormax * colormax; // 1024
maxfill( dist_buf, colormax );
for (cindex = 0;cindex < aNumColors;cindex++ ){
r = aCMap[(3 * cindex) + 2];
g = aCMap[(3 * cindex) + 1];
b = aCMap[(3 * cindex)];
rcenter = r >> nbits;
gcenter = g >> nbits;
bcenter = b >> nbits;
rdist = r - (rcenter * x + x/2);
gdist = g - (gcenter * x + x/2);
cdist = b - (bcenter * x + x/2);
cdist = rdist*rdist + gdist*gdist + cdist*cdist;
crinc = 2 * ((rcenter + 1) * xsqr - (r * x));
cginc = 2 * ((gcenter + 1) * xsqr - (g * x));
cbinc = 2 * ((bcenter + 1) * xsqr - (b * x));
// Array starting points.
cdp = dist_buf + rcenter * rstride + gcenter * gstride + bcenter; // dist 01533120 ..
crgbp = aRGBMap + rcenter * rstride + gcenter * gstride + bcenter; // aRGBMap 01553168
(void)redloop();
}
}
/** --------------------------------------------------------------------------
* find a red max or min value in a color cube
* @return a red component in a certain span
*/
static PRInt32
redloop()
{
PRInt32 detect,r,first;
PRInt32 txsqr = xsqr + xsqr;
static PRInt32 rxx;
detect = 0;
rdist = cdist; // 48
rxx = crinc; // 128
rdp = cdp;
rrgbp = crgbp; // 01553168
first = 1;
for (r=rcenter;r<colormax;r++,rdp+=rstride,rrgbp+=rstride,rdist+=rxx,rxx+=txsqr,first=0){
if ( greenloop( first ) )
detect = 1;
else
if ( detect )
break;
}
rxx=crinc-txsqr;
rdist = cdist-rxx;
rdp=cdp-rstride;
rrgbp=crgbp-rstride;
first=1;
for (r=rcenter-1;r>=0;r--,rdp-=rstride,rrgbp-=rstride,rxx-=txsqr,rdist-=rxx,first=0){
if ( greenloop( first ) )
detect = 1;
else
if ( detect )
break;
}
return detect;
}
/** --------------------------------------------------------------------------
* find a green max or min value in a color cube
* @return a red component in a certain span
*/
static PRInt32
greenloop(PRInt32 aRestart)
{
PRInt32 detect,g,first;
PRInt32 txsqr = xsqr + xsqr;
static PRInt32 here, min, max;
static PRInt32 ginc, gxx, gcdist;
static PRUint32 *gcdp;
static PRUint8 *gcrgbp;
if(aRestart){
here = gcenter;
min = 0;
max = colormax - 1;
ginc = cginc;
}
detect = 0;
gcdp=rdp;
gdp=rdp;
gcrgbp=rrgbp;
grgbp=rrgbp;
gcdist=rdist;
gdist=rdist;
// loop up.
for(g=here,gxx=ginc,first=1;g<=max;
g++,gdp+=gstride,gcdp+=gstride,grgbp+=gstride,gcrgbp+=gstride,
gdist+=gxx,gcdist+=gxx,gxx+=txsqr,first=0){
if(blueloop(first)){
if (!detect){
if (g>here){
here = g;
rdp = gcdp;
rrgbp = gcrgbp;
rdist = gcdist;
ginc = gxx;
}
detect=1;
}
}else
if (detect){
break;
}
}
// loop down
gcdist = rdist-gxx;
gdist = gcdist;
gdp=rdp-gstride;
gcdp=gdp;
grgbp=rrgbp-gstride;
gcrgbp = grgbp;
for (g=here-1,gxx=ginc-txsqr,
first=1;g>=min;g--,gdp-=gstride,gcdp-=gstride,grgbp-=gstride,gcrgbp-=gstride,
gxx-=txsqr,gdist-=gxx,gcdist-=gxx,first=0){
if (blueloop(first)){
if (!detect){
here = g;
rdp = gcdp;
rrgbp = gcrgbp;
rdist = gcdist;
ginc = gxx;
detect = 1;
}
} else
if ( detect ){
break;
}
}
return detect;
}
/** --------------------------------------------------------------------------
* find a blue max or min value in a color cube
* @return a red component in a certain span
*/
static PRInt32
blueloop(PRInt32 aRestart )
{
PRInt32 detect,b,i=cindex;
register PRUint32 *dp;
register PRUint8 *rgbp;
register PRInt32 bxx;
PRUint32 bdist;
register PRInt32 txsqr = xsqr + xsqr;
register PRInt32 lim;
static PRInt32 here, min, max;
static PRInt32 binc;
if (aRestart){
here = bcenter;
min = 0;
max = colormax - 1;
binc = cbinc;
}
detect = 0;
bdist = gdist;
// Basic loop, finds first applicable cell.
for (b=here,bxx=binc,dp=gdp,rgbp=grgbp,lim=max;b<=lim;
b++,dp++,rgbp++,bdist+=bxx,bxx+=txsqr){
if(*dp>bdist){
if(b>here){
here = b;
gdp = dp;
grgbp = rgbp;
gdist = bdist;
binc = bxx;
}
detect = 1;
break;
}
}
// Second loop fills in a run of closer cells.
for (;b<=lim;b++,dp++,rgbp++,bdist+=bxx,bxx+=txsqr){
if (*dp>bdist){
*dp = bdist;
*rgbp = i;
}
else{
break;
}
}
// Basic loop down, do initializations here
lim = min;
b = here - 1;
bxx = binc - txsqr;
bdist = gdist - bxx;
dp = gdp - 1;
rgbp = grgbp - 1;
// The 'find' loop is executed only if we didn't already find something.
if (!detect)
for (;b>=lim;b--,dp--,rgbp--,bxx-=txsqr,bdist-=bxx){
if (*dp>bdist){
here = b;
gdp = dp;
grgbp = rgbp;
gdist = bdist;
binc = bxx;
detect = 1;
break;
}
}
// Update loop.
for (;b>=lim;b--,dp--,rgbp--,bxx-=txsqr,bdist-=bxx){
if (*dp>bdist){
*dp = bdist;
*rgbp = i;
} else{
break;
}
}
// If we saw something, update the edge trackers.
return detect;
}
/** --------------------------------------------------------------------------
* fill in a span with a max value
* @return VOID
*/
static void
maxfill(PRUint32 *buffer,PRInt32 side )
{
register PRInt32 maxv = ~0L;
register PRInt32 i;
register PRUint32 *bp;
for (i=side*side*side,bp=buffer;i>0;i--,bp++) // side*side*side = 32768
*bp = maxv;
}
//------------------------------------------------------------
Reference in New Issue View Git Blame Copy Permalink