Fix renderer so it can render partial characters at borders.
Try to make the code a bit clearer by encapsulating the coordinate transform stuff more clearly.
This commit is contained in:
Stefan `Sec` Zehl
parent
f98c33d49b
commit
db4d929b2a
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@ -10,133 +10,157 @@ char font_direction = FONT_DIR_LTR;
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/* Exported Functions */
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int DoChar(int sx, int sy, int c){
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int x=0;
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/* how many bytes is it high? */
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char height=(font->u8Height-1)/8+1;
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char hoff=(8-(font->u8Height%8))%8;
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const uint8_t * data;
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int width,preblank=0,postblank=0;
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do { /* Get Character data */
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/* Does this font provide this character? */
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if(c<font->u8FirstChar)
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c=font->u8FirstChar+1; // error
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if(c>font->u8LastChar && font->charExtra == NULL)
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c=font->u8FirstChar+1; // error
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if(c>font->u8LastChar && font->charExtra != NULL){
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int cc=0;
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while( font->charExtra[cc] < c)
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cc++;
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if(font->charExtra[cc] > c)
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c=font->u8FirstChar+1; // error
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else
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c=font->u8LastChar+cc+1;
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};
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/* starting offset into character source data */
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int toff=0;
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if(font->u8Width==0){
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for(int y=0;y<c-font->u8FirstChar;y++)
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toff+=font->charInfo[y].widthBits;
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width=font->charInfo[c-font->u8FirstChar].widthBits;
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toff*=height;
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data=&font->au8FontTable[toff];
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postblank=1;
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}else if(font->u8Width==1){ // NEW CODE
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// Find offset and length for our character
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for(int y=0;y<c-font->u8FirstChar;y++)
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toff+=font->charInfo[y].widthBits;
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width=font->charInfo[c-font->u8FirstChar].widthBits;
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if(font->au8FontTable[toff]>>4 == 15){ // It's a raw character!
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preblank = font->au8FontTable[toff+1];
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postblank= font->au8FontTable[toff+2];
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data=&font->au8FontTable[toff+3];
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width=(width-3/height);
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}else{
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data=pk_decode(&font->au8FontTable[toff],&width);
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}
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}else{
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toff=(c-font->u8FirstChar)*font->u8Width*height;
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width=font->u8Width;
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data=&font->au8FontTable[toff];
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};
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}while(0);
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/* "real" coordinates. Our physical display is upside down */
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int rx=RESX-sx-1;
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int ry=RESY-sy-font->u8Height;
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#define xy_(x,yb) ( ( (RESY_B-1) -(yb)) * RESX + \
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( (RESX-1) -( x)) )
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/* Does this font provide this character? */
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if(c<font->u8FirstChar)
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c=font->u8FirstChar+1; // error
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if(c>font->u8LastChar && font->charExtra == NULL)
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c=font->u8FirstChar+1; // error
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if(c>font->u8LastChar && font->charExtra != NULL){
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int cc=0;
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while( font->charExtra[cc] < c)
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cc++;
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if(font->charExtra[cc] > c)
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c=font->u8FirstChar+1; // error
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else
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c=font->u8LastChar+cc+1;
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};
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/* starting offset into character source data */
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int toff=0,width,preblank=0,blank=0;
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if(font->u8Width==0){
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for(int y=0;y<c-font->u8FirstChar;y++)
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toff+=font->charInfo[y].widthBits;
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width=font->charInfo[c-font->u8FirstChar].widthBits;
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toff*=height;
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data=&font->au8FontTable[toff];
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blank=1;
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}else if(font->u8Width==1){ // NEW CODE
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// Find offset and length for our character
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for(int y=0;y<c-font->u8FirstChar;y++)
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toff+=font->charInfo[y].widthBits;
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width=font->charInfo[c-font->u8FirstChar].widthBits;
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if(font->au8FontTable[toff]>>4 == 15){ // It's a raw character!
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preblank = font->au8FontTable[toff+1];
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blank= font->au8FontTable[toff+2];
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data=&font->au8FontTable[toff+3];
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width=(width-3/height);
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}else{
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data=pk_decode(&font->au8FontTable[toff],&width);
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}
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}else{
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toff=(c-font->u8FirstChar)*font->u8Width*height;
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width=font->u8Width;
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data=&font->au8FontTable[toff];
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};
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// boundary sanity checks
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if(sx<0 || sy<0 || sx >= RESX || (sy+font->u8Height) >= RESY)
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return sx; // nothing printed.
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int x=0;
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/* raw character data */
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int byte;
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unsigned char mask;
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/* print forward or backward? */
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int dmul=0;
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if(font_direction==FONT_DIR_RTL){
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dmul=1;
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if(sx-(width+preblank+blank)<=0) // sanity check for left side
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return sx;
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} else if (font_direction==FONT_DIR_LTR){
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dmul=-1;
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if(sx+(width+preblank+blank)>=RESX) // sanity check for right side
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return sx;
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};
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/* Our display height is non-integer. Adjust for that. */
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sy+=RESY%8;
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/* Fonts may not be byte-aligned, shift up so the top matches */
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sy-=hoff;
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/* break down the position on byte boundaries */
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char yidx=ry/8;
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char yoff=ry%8;
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signed int yidx=sy/8;
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signed int yoff=sy%8;
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rx+=dmul*preblank;
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if(yoff<0) { /* % operator is stupid on negative values */
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yoff+=8;
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yidx-=1;
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};
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sx+=preblank;
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/* multiple 8-bit-lines */
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for(int y=0;y<=height;y++){
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if(yidx+y<0)
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continue;
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if(yidx+y>=RESY_B)
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continue;
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// Number of bits we need to do in this line:
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int m=yoff+font->u8Height-8*y;
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m=yoff+height*8-y*8;
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if(m>8)m=8;
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if(m<0)m=0;
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mask=255<<(8-m);
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mask=255>>(8-m); // Generate bitmask
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/* Empty space at top is not to be masked, we consider it
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not to be part of the font */
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if(y==0){
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mask=mask>>yoff;
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};
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mask=mask<<(yoff+hoff);
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}else if(y==1 && yoff+hoff>8){
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mask=mask<<(yoff+hoff-8);
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};
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if(mask==0) // Optimize :-)
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break;
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continue;
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if(font_direction==FONT_DIR_LTR)
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flip(mask);
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flip(mask);
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for(int m=1;m<=preblank;m++){
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lcdBuffer[(rx-dmul*(m))+(yidx+y)*RESX]&=~mask;
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/* Optional: empty space to the left */
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for(int b=1;b<=preblank;b++){
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if(sx-b<0)
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continue;
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if(sx-b>=RESX)
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continue;
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lcdBuffer[xy_(sx-b,yidx+y)]&=~mask;
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};
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/* Render character */
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for(x=0;x<width;x++){
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unsigned char b1,b2;
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if(y==0)
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b1=0;
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else
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b1=data[x*height+y-1];
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b1=data[x*height+(height-1)-(y-1)];
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if(y==height)
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b2=0;
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else
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b2=data[x*height+y];
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b2=data[x*height+(height-1)-(y)];
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byte= (b1<<(8-yoff)) | (b2>>yoff);
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if(font_direction==FONT_DIR_LTR)
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flip(byte);
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byte= (b1>>(8-yoff)) | (b2<<yoff);
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flip(byte);
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lcdBuffer[(rx+dmul*x)+(yidx+y)*RESX]&=~mask;
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lcdBuffer[(rx+dmul*x)+(yidx+y)*RESX]|=byte;
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if(sx+x<0)
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continue;
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if(sx+x>=RESX)
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continue;
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lcdBuffer[xy_(sx+x,yidx+y)]&=~mask;
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lcdBuffer[xy_(sx+x,yidx+y)]|=byte;
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};
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for(int m=0;m<blank;m++){
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lcdBuffer[(rx+dmul*(x+m))+(yidx+y)*RESX]&=~mask;
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/* Optional: empty space to the right */
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for(int m=0;m<postblank;m++){
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if(sx+x+m<0)
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continue;
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if(sx+x+m>=RESX)
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continue;
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lcdBuffer[xy_(sx+x+m,yidx+y)]&=~mask;
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};
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};
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return sx-dmul*(x+preblank+blank);
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return sx+(width+postblank);
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};
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#define UTF8
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