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ZXGraphics.c
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//
// ZX Graphics library, part of Another Graphics library
//
// Created by error on 14.01.18.
// Copyright © 2018 errorsoft. All rights reserved.
//
#include "ZXGraphics.h"
#include "ZXGraphicsBitBlit.h"
#include <stdlib.h>
#include <assert.h>
#define false 0
#define true 1
#define PixelOn ZXFastPixelOn
#define PixelOff ZXFastPixelOff
#define PixelChange ZXFastPixelChange
#define SetPixel ZXFastSetPixel
#define GetPixel ZXFastGetPixel
#define CalcScanSize ZXCalcScanSizeM
#define CalcFullBytes ZXCalcFullBytesM
#define PixelPtrData ZXPixelPtrDataM
#define BitmapScanSize ZXBitmapScanSizeM
#define BitmapIsOffset ZXBitmapIsOffsetM
#define BitmapIsClipRect ZXBitmapIsClipRectM
#define BitmapIsDrawLastPixel ZXBitmapIsDrawLastPixelM
#define BitmapPixelPtr ZXBitmapPixelPtrM
#define BitmapBeginPtr ZXBitmapBeginPtrM
#define BitmapEndPtr ZXBitmapEndPtrM
#define BitmapDataSize ZXBitmapDataSizeM
#define ClipSpan ClipSpanM
#define ClipValue ClipValueM
#define IsDrawRectIntersectRect IsDrawRectIntersectRectM
#define IsDrawRectIntersectSize IsDrawRectIntersectSizeM
// ====================================================================
// Macros
// ====================================================================
#define OffsetPoint(px, py, offset) \
do { \
(px) += (offset).x; \
(py) += (offset).y; \
} while(0)
#define IsPointClippedForBitmapSize(bitmap, x, y) \
(((x) < 0) || ((y) < 0) || (x >= (bitmap)->width) || (y >= (bitmap)->height))
#define IsPointClippedForRect(rect, x, y) \
((x < (rect).left) || (y < (rect).top) || (x >= (rect).right) || (y >= (rect).bottom))
#ifdef USE_CLIPRECT
#define IsPointClippedForBitmap(bitmap, x, y) \
( ZXBitmapIsClipRect((bitmap)) ? \
IsPointClippedForRect((bitmap)->clipRect, (x), (y)) : \
IsPointClippedForBitmapSize((bitmap), (x), (y)) )
#else
#define IsPointClippedForBitmap(bitmap, x, y) \
IsPointClippedForBitmapSize((bitmap), (x), (y)) )
#endif
// horz
#define IsYEntryToBitmap(bitmap, y) \
( ((y) >= 0) && ((y) <= ((bitmap)->height - 1)) )
#define IsYEntryToBitmapClip(bitmap, y) \
( ((y) >= (bitmap)->clipRect.top) && ((y) < ((bitmap)->clipRect.bottom)) )
#define IsHorzEntryToBitmap(bitmap, x1, x2) \
(Max((x1), 0) <= Min((x2), (bitmap)->width - 1))
#define IsHorzEntryToBitmapClip(bitmap, x1, x2) \
(Max((x1), (bitmap)->clipRect.left) <= Min((x2), (bitmap)->clipRect.right - 1))
// vert
#define IsXEntryToBitmap(bitmap, x) \
( ((x) >= 0) && ((x) <= ((bitmap)->width - 1)) )
#define IsXEntryToBitmapClip(bitmap, x) \
( ((x) >= (bitmap)->clipRect.left) && ((x) < ((bitmap)->clipRect.right)) )
#define IsVertEntryToBitmap(bitmap, y1, y2) \
(Max((y1), 0) <= Min((y2), (bitmap)->height - 1))
#define IsVertEntryToBitmapClip(bitmap, y1, y2) \
(Max((y1), (bitmap)->clipRect.top) <= Min((y2), (bitmap)->clipRect.bottom - 1))
// ====================================================================
// ZXBitmap object
// ====================================================================
ZXData ZXCreateBitmapData(int width, int heignt) {
ZXData data;
data = (ZXData)malloc(sizeof(unsigned char) * CalcScanSize(width) * heignt);
return data;
}
ZXBitmapRef ZXLinkBitmapCreate(int width, int height, ZXData data) {
ZXBitmapRef obj;
obj = (ZXBitmapRef)malloc(sizeof(ZXBitmap));
if(obj == NULL)
return NULL;
obj->width = width;
obj->height = height;
obj->isClipRect = false;
obj->isOffset = false;
obj->isDrawLastPixel = false;
#ifdef USE_PRECALC_SCANSIZE
obj->scanSize = CalcScanSize(obj->width);
#endif
obj->data = data;
return obj;
}
ZXBitmapRef ZXBitmapCreate(int width, int height) {
ZXData data;
ZXBitmapRef obj;
data = ZXCreateBitmapData(width, height);
if(data == NULL)
return NULL;
obj = ZXLinkBitmapCreate(width, height, data);
if(obj == NULL)
free(data);
return obj;
}
ZXBitmapRef ZXBitmapFree(ZXBitmapRef bitmap) {
free(bitmap->data);
free(bitmap);
return NULL;
}
ZXBitmapRef ZXLinkBitmapFree(ZXBitmapRef bitmap) {
free(bitmap);
return NULL;
}
int ZXBitmapResize(ZXBitmapRef bitmap, int newWidth, int newHeight) {
free(bitmap->data);
bitmap->data = ZXCreateBitmapData(newWidth, newHeight);
if(bitmap->data == NULL)
return 0;
#ifdef USE_PRECALC_SCANSIZE
bitmap->scanSize = CalcScanSize(bitmap->width);
#endif
return 1;
}
int ZXBitmapCopy(ZXBitmapRef dest, ZXBitmapRef src) {
ZXData pEndDest, pDest, pSrc;
if((dest->width != src->width) || (dest->height != src->height))
return 0;
pDest = dest->data;
pSrc = src->data;
pEndDest = pDest + BitmapDataSize(dest);
for(; pDest < pEndDest; pDest++) {
*pDest = *pSrc;
pSrc++;
}
return 1;
}
void ZXBitmapCopyInfo(ZXBitmapRef dest, ZXBitmapRef src) {
memcpy(dest, src, sizeof(ZXBitmap));
}
void ZXBitmapCopyData(ZXBitmapRef bitmap, ZXData data) {
ZXData pEndDest, p;
pEndDest = bitmap->data + BitmapDataSize(bitmap);
for(p = bitmap->data; p < pEndDest; p++) {
*p = *data;
data++;
}
}
ZXBitmapRef ZXBitmapClone(ZXBitmapRef bitmap) {
ZXBitmapRef obj;
obj = ZXBitmapCreate(bitmap->width, bitmap->height);
if(obj == NULL)
return NULL;
obj->offset = bitmap->offset;
obj->clipRect = bitmap->clipRect;
obj->isClipRect = bitmap->isClipRect;
obj->isOffset = bitmap->isOffset;
obj->isDrawLastPixel = bitmap->isDrawLastPixel;
ZXBitmapCopy(obj, bitmap);
return obj;
}
void ZXBitmapInvert(ZXBitmapRef bitmap) {
ZXData end, p;
end = bitmap->data + BitmapDataSize(bitmap);
for(p = bitmap->data; p < end ;p++)
*p = ~(*p);
}
//TODO: test
void ZXBitmapFlipHorz(ZXBitmapRef bitmap) {
unsigned char t;
int x, y, compX, w, h;
w = bitmap->width / 2;
h = bitmap->height;
compX = bitmap->width - 1;
for(x = 0; x < w; x++) {
for(y = 0; y < h; y++) {
t = GetPixel(bitmap, x, y);
SetPixel(bitmap, x, y, GetPixel(bitmap, compX, y));
SetPixel(bitmap, compX, y, t);
}
compX--;
}
}
//TODO: optimize me please
void ZXBitmapFlipVert(ZXBitmapRef bitmap) {
unsigned char t;
int x, y, compY, w, h;
w = bitmap->width;
h = bitmap->height / 2;
compY = bitmap->height - 1;
for(y = 0; y < h; y++) {
for(x = 0; x < w; x++) {
t = GetPixel(bitmap, x, y);
SetPixel(bitmap, x, y, GetPixel(bitmap, x, compY));
SetPixel(bitmap, x, compY, t);
}
compY--;
}
}
//TODO: test
//TODO: rewrite me please
int ZXBitmapRotate90(ZXBitmapRef bitmap, int angle) {
ZXBitmapRef r;
int x, y;
unsigned char t;
if((angle < 1) || (angle > 3))
return 0;
if((angle == 1) || (angle == 3))
r = ZXBitmapCreate(bitmap->height, bitmap->width);
else
r = ZXBitmapCreate(bitmap->width, bitmap->height);
if(r == NULL)
return 0;
switch(angle) {
case 1:
for(y = 0; y < bitmap->height; y++) {
for(x = 0; x < bitmap->width; x++) {
t = GetPixel(bitmap, x, bitmap->height - y - 1);
SetPixel(r, y, x, t);
}
}
break;
case 2:
for(y = 0; y < bitmap->height; y++) {
for(x = 0; x < bitmap->width; x++) {
t = GetPixel(bitmap, bitmap->width - x - 1, bitmap->height - y - 1);
SetPixel(r, x, y, t);
}
}
break;
case 3:
for(y = 0; y < bitmap->height; y++) {
for(x = 0; x < bitmap->width; x++) {
t = GetPixel(bitmap, bitmap->width - x - 1, y);
SetPixel(r, y, x, t);
}
}
break;
}
// it`s magic
bitmap->height = r->height;
bitmap->width = r->width;
#ifdef USE_PRECALC_SCANSIZE
bitmap->scanSize = r->scanSize;
#endif
free(bitmap->data);
bitmap->data = r->data;
ZXLinkBitmapFree(r);
return 1;
}
void ZXBitmapSetClipRect(ZXBitmapRef bitmap, int x, int y, int width, int height) {
if(width < 0 || height < 0)
return;
bitmap->isClipRect = (width != 0 && height != 0);
bitmap->clipRect.left = ClipValueM(0, bitmap->width, x);
bitmap->clipRect.top = ClipValueM(0, bitmap->height, y);
bitmap->clipRect.right = Min(bitmap->clipRect.left + width, bitmap->width);
bitmap->clipRect.bottom = Min(bitmap->clipRect.right + height, bitmap->height);
}
// ====================================================================
// Bitmap helpers
// ====================================================================
int ZXCalcScanSize(int width) {
return ZXCalcScanSizeM(width);
}
int ZXCalcFullBytes(int x, int width) {
return ZXCalcFullBytesM(x, width);
}
ZXData ZXPixelPtrData(ZXData data, int scanSize, int x, int y) {
return ZXPixelPtrDataM(data, scanSize, x, y);
}
int ZXBitmapScanSize(ZXBitmapRef bitmap) {
return ZXBitmapScanSizeM(bitmap);
}
int ZXBitmapIsOffset(ZXBitmapRef bitmap) {
return ZXBitmapIsOffsetM(bitmap);
}
int ZXBitmapIsClipRect(ZXBitmapRef bitmap) {
return ZXBitmapIsClipRectM(bitmap);
}
ZXData ZXBitmapPixelPtr(ZXBitmapRef bitmap, int x, int y) {
return ZXBitmapPixelPtrM(bitmap, x, y);
}
ZXData ZXBitmapBeginPtr(ZXBitmapRef bitmap, int x, int y) {
return ZXBitmapBeginPtrM(bitmap, x, y);
}
ZXData ZXBitmapEndPtr(ZXBitmapRef bitmap, int x, int y) {
return ZXBitmapEndPtrM(bitmap, x, y);
}
int ZXBitmapDataSize(ZXBitmapRef bitmap) {
return ZXBitmapDataSizeM(bitmap);
}
// ====================================================================
// Raw
// ====================================================================
void ZXRawSetPixel(ZXBitmapRef bitmap, int x, int y, int color) {
ZXData p;
p = BitmapPixelPtr(bitmap, x, y);
switch(color) {
case 0:
*p &= ~(0x80 >> (x%8));
break;
case 1:
*p |= (0x80 >> (x%8));
break;
case 2:
*p ^= (0x80 >> (x%8));
break;
}
}
// --------------------------------------------------------------------
void ZXRawPixelOn(ZXBitmapRef bitmap, int x, int y) {
ZXFastPixelOn(bitmap, x, y);
}
// --------------------------------------------------------------------
void ZXRawPixelOff(ZXBitmapRef bitmap, int x, int y) {
ZXFastPixelOff(bitmap, x, y);
}
// --------------------------------------------------------------------
void ZXRawPixelChange(ZXBitmapRef bitmap, int x, int y) {
ZXFastPixelChange(bitmap, x, y);
}
// --------------------------------------------------------------------
int ZXRawGetPixel(ZXBitmapRef bitmap, int x, int y) {
ZXData p;
p = bitmap->data + BitmapScanSize(bitmap) * y + x / 8;
return (*p >> (7 - x % 8)) & 0x01;
}
// --------------------------------------------------------------------
void ZXRawDrawLine(ZXBitmapRef bitmap, int x1, int y1, int x2, int y2, int color, int isDrawLastPixel) {
int t, dist, x_error, y_error, dx, dy, x_inc, y_inc;
dx = x2 - x1;
dy = y2 - y1;
if(dx > 0)x_inc = 1; else x_inc = -1;
if(dx == 0)x_inc = 0;
if(dy > 0)y_inc = 1; else y_inc = -1;
if(dy == 0)y_inc = 0;
dx = Abs(dx);
dy = Abs(dy);
dist = Max(dx, dy);
x_error = dist / 2;
y_error = dist / 2;
for(t = 0; t < dist; t++)
{
SetPixel(bitmap, x1, y1, color);
x_error = x_error + dx;
y_error = y_error + dy;
if(x_error >= dist)
{
x_error = x_error - dist;
x1 = x1 + x_inc;
}
if(y_error >= dist)
{
y_error = y_error - dist;
y1 = y1 + y_inc;
}
}
if(isDrawLastPixel)
SetPixel(bitmap, x1, y1, color);
}
// --------------------------------------------------------------------
static const unsigned char horzRightByte[] =
{
0x80,// 9
0xC0,// 10
0xE0,// 11
0xF0,// 12
0xF8,// 13
0xFC,// 14
0xFE,// 15
0xFF,
};
static const unsigned char horzLeftByte[] =
{
0xFF,// 0
0x7F,// 1
0x3F,// 2
0x1F,// 3
0x0F,// 4
0x07,// 5
0x03,// 6
0x01,// 7
};
// DONE
void ZXRawDrawHorz(ZXBitmapRef bitmap, int y, int x1, int x2, int color) {
int t;
ZXData p, begin, end;
unsigned char byte;
if(x1 > x2) {
t = x1; x1 = x2; x2 = t;
}
// less an 8 pixels
if(x2 - x1 < 7) {
for(t = x1; t <= x2; t++)
SetPixel(bitmap, t, y, color);
return;
}
// left pixels
if(x1 % 8) {
p = BitmapPixelPtr(bitmap, x1, y);
if(color == 0)
*p &= ~horzLeftByte[x1 % 8];
else if(color == 1)
*p |= horzLeftByte[x1 % 8];
else
*p ^= horzLeftByte[x1 % 8];
}
// full bytes
byte = color * 0xFF;
begin = BitmapBeginPtr(bitmap, x1, y);
end = BitmapEndPtr(bitmap, x2, y);
if(color != 2)
for(p = begin; p < end; p++)
*p = byte;
else
for(p = begin; p < end; p++)
*p ^= byte;
// right pixels
if((x2 + 1) % 8) {
p = BitmapPixelPtr(bitmap, x2, y);
if(color == 0)
*p &= ~horzRightByte[x2 % 8];
else if(color == 1)
*p |= horzRightByte[x2 % 8];
else
*p ^= horzRightByte[x2 % 8];
}
}
// --------------------------------------------------------------------
void ZXRawDrawClipHorz(ZXBitmapRef bitmap, int y, int x1, int x2, int color) {
// cliprect
#ifdef USE_CLIPRECT
if(BitmapIsClipRect(bitmap)) {
if(!IsYEntryToBitmapClip(bitmap, y))
return;
if(!IsHorzEntryToBitmapClip(bitmap, x1, x2))
return;
ClipSpan(bitmap->clipRect.left, bitmap->clipRect.right - 1, x1, x2);
} else
#endif
{
if(!IsYEntryToBitmap(bitmap, y))
return;
if(!IsHorzEntryToBitmap(bitmap, x1, x2))
return;
ClipSpan(0, bitmap->width - 1, x1, x2);
}
ZXRawDrawHorz(bitmap, y, x1, x2, color);
}
// --------------------------------------------------------------------
// DONE
void ZXRawDrawVert(ZXBitmapRef bitmap, int x, int y1, int y2, int color) {
unsigned char byte;
ZXData p;
int t, y, scanline;
if(y1 > y2)
Swap(y1, y2, t);
byte = 0x80 >> (x % 8);
p = BitmapPixelPtr(bitmap, x, y1);
scanline = BitmapScanSize(bitmap);
if(color == 0)
for(y = y1; y <= y2; y++) {
*p &= ~byte;
p += scanline;
}
else if(color == 1)
for(y = y1; y <= y2; y++) {
*p |= byte;
p += scanline;
}
else
for(y = y1; y <= y2; y++) {
*p ^= byte;
p += scanline;
}
}
// --------------------------------------------------------------------
void ZXRawDrawClipVert(ZXBitmapRef bitmap, int x, int y1, int y2, int color) {
// cliprect
#ifdef USE_CLIPRECT
if(BitmapIsClipRect(bitmap)) {
if(!IsXEntryToBitmapClip(bitmap, x))
return;
if(!IsVertEntryToBitmapClip(bitmap, y1, y2))
return;
ClipSpan(bitmap->clipRect.top, bitmap->clipRect.bottom - 1, y1, y2);
} else
#endif
{
if(!IsXEntryToBitmap(bitmap, x))
return;
if(!IsVertEntryToBitmap(bitmap, y1, y2))
return;
ClipSpan(0, bitmap->height - 1, y1, y2);
}
ZXRawDrawVert(bitmap, x, y1, y2, color);
}
// --------------------------------------------------------------------
// ====1====
// | |
// 3 4
// | |
// ====2====
void ZXRawDrawRect(ZXBitmapRef bitmap, int x1, int y1, int x2, int y2, int color) {
// 1
ZXRawDrawClipHorz(bitmap, y1, x1, x2, color);
// 2
if(y1 != y2)
ZXRawDrawClipHorz(bitmap, y2, x1, x2, color);
// 3, 4
if(y2 - y1 > 1) {
// 3
ZXRawDrawClipVert(bitmap, x1, y1 + 1, y2 - 1, color);
// 4
if(x1 != x2)
ZXRawDrawClipVert(bitmap, x2, y1 + 1, y2 - 1, color);
}
}
// --------------------------------------------------------------------
void ZXRawDrawSides(ZXBitmapRef bitmap, int x1, int y1, int x2, int y2, int sides, int color) {
// 1
if(sides & SideTop)
ZXRawDrawClipHorz(bitmap, y1, x1, x2, color);
// 2
if(y1 != y2)
if(sides & SideBottom)
ZXRawDrawClipHorz(bitmap, y2, x1, x2, color);
// 3, 4
if(y2 - y1 > 1) {
// 3
if(sides & SideLeft)
ZXRawDrawClipVert(bitmap, x1, y1 + BoolTo01(sides & SideTop), y2 - BoolTo01(sides & SideBottom), color);
// 4
if(x1 != x2)
if(sides & SideRight)
ZXRawDrawClipVert(bitmap, x2, y1 + BoolTo01(sides & SideTop), y2 - BoolTo01(sides & SideBottom), color);
}
}
// --------------------------------------------------------------------
void ZXRawFillRect(ZXBitmapRef bitmap, int x1, int y1, int x2, int y2, int color) {
int y;
for(y = y1; y <= y2; y++)
ZXRawDrawHorz(bitmap, y, x1, x2, color);
}
// --------------------------------------------------------------------
// 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
// _________________________________________________________________________________________________
// H | | | | | | | H | | | | | | | H | | | | | | | H
// ' ' ' '
// ' ' ' '
// ' left byte ' full bytes ' end byte '
// ^_______________________^_______________________________^_______________^________________________
// offset->H | | | | | | | H | | | | | | | H | | | | | | | H
// -----------------------------------------------------------------------------------------------------
// | X X X X ' X X X X | X X X X ' X X X X | X X X X ' X X X X |
// -------------------------------------------------------------------------------------------------
// <-- srcOffset
static const unsigned char rByte[] =
{
0x00,
0x80,// 9
0xC0,// 10
0xE0,// 11
0xF0,// 12
0xF8,// 13
0xFC,// 14
0xFE,// 15
};
static const unsigned char lByte[] =
{
0xFF,// 0
0x7F,// 1
0x3F,// 2
0x1F,// 3
0x0F,// 4
0x07,// 5
0x03,// 6
0x01,// 7
};
// WARNING!!!
// GOLD VERSION.
// If you do not want to go to hell, then do not go into this code.
// This function is working of 100%, but is very hard for mind.
// Any changes of this fuction or any BitBlit functions should be accompanied
// running "ZXGraphicsGen.py" and running test functions in zxGraphicsTest.h.
// BEGIN $RawBitBlit(WriteByte1, WriteByte2, WriteByte3, WriteByte4)$. Do not change this line!
void ZXRawBitBlitCopy(ZXBitmapRef bitmap, int x, int y,
ZXBitmapRef src, int srcX, int srcY, int srcWidth, int srcHeight)
{
/* dest and src */
ZXData pScan, pSrcScan, pScanEnd;
ZXData p, pSrc;
unsigned char b;
int scan, srcScan;
/* offsets, flags, etc */
int offset, srcOffset, endPixels;
int fullBytes, endLine;
int compRealOffset, realOffset;
int isRegular;
/* calculate the sizes of scan lines */
scan = BitmapScanSize(bitmap);
srcScan = BitmapScanSize(src);
/* get pointers to a byte corresponding to a pixel */
pScan = BitmapPixelPtr(bitmap, x, y);
pSrcScan = BitmapPixelPtr(src, srcX, srcY);
/* calculating end vertical line */
endLine = y + srcHeight;
/* bitmap offset */
offset = x % 8;
/* src offset */
srcOffset = srcX % 8;
/* get information about how much pixels should be shifted, */
/* important: when (offset < srcOffset) one byte is completely absorbed when outputting the left byte */
if(offset >= srcOffset)
realOffset = offset - srcOffset;
else
realOffset = 8 - (srcOffset - offset);
compRealOffset = 8 - realOffset;
/* count of full-size bytes */
fullBytes = CalcFullBytes(x, srcWidth);
/* offset end pixel */
endPixels = (x + srcWidth) % 8;
/* regular draw or not */
/* a) snap to right colum */
/* b) snap to left colum */
isRegular = (offset + srcWidth >= 8) || (offset == 0);
/* main loop y */
for(; y < endLine; y++) {
p = pScan;
pSrc = pSrcScan;
/* take care of left byte */
/* xxxxxxxx XXXXXXXX xxxxxxxx */
/* ^ we here */
if(offset != 0) {
if (offset >= srcOffset) {
b = *pSrc >> realOffset;
/* need next byte if we haven't real offset */
if(realOffset == 0)
pSrc++;
}
else {
b = (*pSrc << compRealOffset) |
(*(pSrc + 1) >> realOffset);
/* we completely used a byte, take a new */
pSrc++;
}
/* combine dest and src */
if(isRegular)
*p = (*p & rByte[offset]) | (b & lByte[offset]); /* $WriteByte1$ */
else
*p = (*p & ~(rByte[srcWidth] >> offset)) | (b & rByte[srcWidth] >> offset); /* $WriteByte2$ */
p++;
}
/* main loop x */
/* xxxxxxxx XXXXXXXX xxxxxxxx */
/* ^ we here */
pScanEnd = p + fullBytes;
if(realOffset != 0) {
for(; p < pScanEnd; p++) {
b = (*pSrc << compRealOffset) |
(*(pSrc + 1) >> realOffset);
/* combine dest and src */
*p = b; /* $WriteByte3$ */
pSrc++;
}
}
else {
for(; p < pScanEnd; p++) {
b = *pSrc;
/* combine dest and src */
*p = b; /* $WriteByte3$ */
pSrc++;
}
}
/* take care of right byte */
/* xxxxxxxx XXXXXXXX xxxxxxxx */
/* ^ we here */
if(isRegular && endPixels) {
if(realOffset != 0) {
b = *pSrc << compRealOffset;
/* .. end pixel is double byte src */
if(endPixels > realOffset)
b |= *(pSrc + 1) >> realOffset;
}
else
b = *pSrc;
/* combine dest and src */
*p = (*p & lByte[endPixels]) | (b & rByte[endPixels]); /* $WriteByte4$ */
}
pScan += scan;
pSrcScan += srcScan;
}
}
// END $RawBitBlit$. Do not change this line!
// --------------------------------------------------------------------
// BEGIN $RawMaskBlit(WriteByte1, WriteByte2, WriteByte3, WriteByte4)$. Do not change this line!
void ZXRawMaskBlitCopy(ZXBitmapRef bitmap, int x, int y,
ZXBitmapRef src, int srcX, int srcY, int srcWidth, int srcHeight, ZXData maskData)
{
/* dest and src */
ZXData pScan, pSrcScan, pMaskScan, pScanEnd;
ZXData p, pSrc, pMask;
unsigned char b, m;
int scan, srcScan;
/* offsets, flags, etc */
int offset, srcOffset, endPixels;
int fullBytes, endLine;
int compRealOffset, realOffset;
int isRegular;
/* calculate the sizes of scan lines */
scan = BitmapScanSize(bitmap);
srcScan = BitmapScanSize(src);
/* get pointers to a byte corresponding to a pixel */
pScan = BitmapPixelPtr(bitmap, x, y);
pSrcScan = BitmapPixelPtr(src, srcX, srcY);
pMaskScan = PixelPtrData(maskData, srcScan, srcX, srcY);
/* calculating end vertical line */
endLine = y + srcHeight;
/* bitmap offset */
offset = x % 8;
/* src offset */
srcOffset = srcX % 8;
/* get information about how much pixels should be shifted, */
/* important: when (offset < srcOffset) one byte is completely absorbed when outputting the left byte */
if(offset >= srcOffset)
realOffset = offset - srcOffset;
else
realOffset = 8 - (srcOffset - offset);
compRealOffset = 8 - realOffset;
/* count of full-size bytes */
fullBytes = CalcFullBytes(x, srcWidth);
/* offset end pixel */
endPixels = (x + srcWidth) % 8;
/* regular draw or not */
/* a) snap to right colum */
/* b) snap to left colum */
isRegular = (offset + srcWidth >= 8) || (offset == 0);
/* main loop y */
for(; y < endLine; y++) {
p = pScan;
pSrc = pSrcScan;
pMask = pMaskScan;
/* take care of left byte */
/* xxxxxxxx XXXXXXXX xxxxxxxx */
/* ^ we here */
if(offset != 0) {
if (offset >= srcOffset) {
b = *pSrc >> realOffset;
m = *pMask >> realOffset;
/* need next byte if we haven't real offset */
if(realOffset == 0) {
pSrc++;
pMask++;
}
}
else {
b = (*pSrc << compRealOffset) |
(*(pSrc + 1) >> realOffset);
m = (*pMask << compRealOffset) |
(*(pMask + 1) >> realOffset);
/* we completely used a byte, take a new */
pSrc++;
pMask++;
}
/* combine dest and src */
if(isRegular) {
b = (*p & rByte[offset]) | (b & lByte[offset]);/* $WriteByte1$ */
*p = (*p & ~m) | (b & m);
}
else {
b = (*p & ~(rByte[srcWidth] >> offset)) | (b & (rByte[srcWidth] >> offset));/* $WriteByte2$ */
*p = (*p & ~m) | (b & m);
}
p++;
}
/* main loop x */
/* xxxxxxxx XXXXXXXX xxxxxxxx */
/* ^ we here */
pScanEnd = p + fullBytes;
if(realOffset != 0) {
for(; p < pScanEnd; p++) {
b = (*pSrc << compRealOffset) |
(*(pSrc + 1) >> realOffset);
m = (*pMask << compRealOffset) |
(*(pMask + 1) >> realOffset);
/* combine dest and src */
b = b; /* $WriteByte3$ */
*p = (*p & (~m)) | (b & m);
pSrc++;
pMask++;
}
}
else {
for(; p < pScanEnd; p++) {
b = *pSrc;
m = *pMask;
/* combine dest and src */
b = b; /* $WriteByte3$ */
*p = (*p & (~m)) | (b & m);
pSrc++;
pMask++;
}
}
/* take care of right byte */
/* xxxxxxxx XXXXXXXX xxxxxxxx */
/* ^ we here */
if(isRegular && endPixels) {
if(realOffset != 0) {
b = *pSrc << compRealOffset;
m = *pMask << compRealOffset;
/* .. end pixel is double byte src */
if(endPixels > realOffset) {