/**
* Compose a colour based on RGBA values and the current pixel value.
* Handles fully transparent and solid pixels in a special (faster) way.
*/
static inline uint32 ComposeColourRGBA(uint r, uint g, uint b, uint a, uint32 current)
{
if (a == 0) return current;
if (a >= 255) return ComposeColour(0xFF, r, g, b);
return ComposeColourRGBANoCheck(r, g, b, a, current);
}
/**
* Compose a colour based on Pixel value, alpha value, and the current pixel value.
*/
static inline uint32 ComposeColourPANoCheck(uint32 colour, uint a, uint32 current)
{
uint r = GB(colour, 16, 8);
uint g = GB(colour, 8, 8);
uint b = GB(colour, 0, 8);
return ComposeColourRGBANoCheck(r, g, b, a, current);
}
/**
* Compose a colour based on Pixel value, alpha value, and the current pixel value.
*/
static inline Colour ComposeColourPANoCheck(Colour colour, uint a, Colour current)
{
uint r = colour.r;
uint g = colour.g;
uint b = colour.b;
return ComposeColourRGBANoCheck(r, g, b, a, current);
}
inline void Blitter_32bppOptimized::Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom)
{
const SpriteData *src = (const SpriteData *)bp->sprite;
/* src_px : each line begins with uint32 n = 'number of bytes in this line',
* then n times is the Colour struct for this line */
const Colour *src_px = (const Colour *)(src->data + src->offset[zoom][0]);
/* src_n : each line begins with uint32 n = 'number of bytes in this line',
* then interleaved stream of 'm' and 'n' channels. 'm' is remap,
* 'n' is number of bytes with the same alpha channel class */
const uint8 *src_n = (const uint8 *)(src->data + src->offset[zoom][1]);
/* skip upper lines in src_px and src_n */
for (uint i = bp->skip_top; i != 0; i--) {
src_px = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
src_n += *(uint32 *)src_n;
}
/* skip lines in dst */
uint32 *dst = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;
/* store so we don't have to access it via bp everytime (compiler assumes pointer aliasing) */
const byte *remap = bp->remap;
for (int y = 0; y < bp->height; y++) {
/* next dst line begins here */
uint32 *dst_ln = dst + bp->pitch;
/* next src line begins here */
const Colour *src_px_ln = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
src_px++;
/* next src_n line begins here */
const uint8 *src_n_ln = src_n + *(uint32 *)src_n;
src_n += 4;
/* we will end this line when we reach this point */
uint32 *dst_end = dst + bp->skip_left;
/* number of pixels with the same aplha channel class */
uint n;
while (dst < dst_end) {
n = *src_n++;
if (src_px->a == 0) {
dst += n;
src_px ++;
src_n++;
} else {
if (dst + n > dst_end) {
uint d = dst_end - dst;
src_px += d;
src_n += d;
dst = dst_end - bp->skip_left;
dst_end = dst + bp->width;
n = min<uint>(n - d, (uint)bp->width);
goto draw;
}
dst += n;
src_px += n;
src_n += n;
}
}
dst -= bp->skip_left;
dst_end -= bp->skip_left;
dst_end += bp->width;
while (dst < dst_end) {
n = min<uint>(*src_n++, (uint)(dst_end - dst));
if (src_px->a == 0) {
dst += n;
src_px++;
src_n++;
continue;
}
draw:;
switch (mode) {
case BM_COLOUR_REMAP:
if (src_px->a == 255) {
do {
uint m = *src_n;
/* In case the m-channel is zero, do not remap this pixel in any way */
if (m == 0) {
*dst = src_px->data;
} else {
uint r = remap[m];
if (r != 0) *dst = this->LookupColourInPalette(r);
}
dst++;
src_px++;
src_n++;
} while (--n != 0);
} else {
do {
uint m = *src_n;
if (m == 0) {
*dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
} else {
uint r = remap[m];
if (r != 0) *dst = ComposeColourPANoCheck(this->LookupColourInPalette(r), src_px->a, *dst);
}
dst++;
src_px++;
src_n++;
} while (--n != 0);
}
break;
case BM_TRANSPARENT:
/* TODO -- We make an assumption here that the remap in fact is transparency, not some colour.
* This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
* we produce a result the newgrf maker didn't expect ;) */
/* Make the current colour a bit more black, so it looks like this image is transparent */
src_n += n;
if (src_px->a == 255) {
src_px += n;
do {
*dst = MakeTransparent(*dst, 3, 4);
dst++;
} while (--n != 0);
} else {
do {
*dst = MakeTransparent(*dst, (256 * 4 - src_px->a), 256 * 4);
dst++;
src_px++;
} while (--n != 0);
}
break;
default:
if (src_px->a == 255) {
/* faster than memcpy(), n is usually low */
src_n += n;
do {
*dst = src_px->data;
dst++;
src_px++;
} while (--n != 0);
} else {
src_n += n;
do {
*dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
dst++;
src_px++;
} while (--n != 0);
}
break;
}
}
dst = dst_ln;
src_px = src_px_ln;
src_n = src_n_ln;
}
}
inline void Blitter_32bppAnim::Draw(const Blitter::BlitterParams *bp, ZoomLevel zoom)
{
const SpriteData *src = (const SpriteData *)bp->sprite;
const Colour *src_px = (const Colour *)(src->data + src->offset[zoom][0]);
const uint16 *src_n = (const uint16 *)(src->data + src->offset[zoom][1]);
for (uint i = bp->skip_top; i != 0; i--) {
src_px = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
src_n = (const uint16 *)((const byte *)src_n + *(const uint32 *)src_n);
}
Colour *dst = (Colour *)bp->dst + bp->top * bp->pitch + bp->left;
uint16 *anim = this->anim_buf + ((uint32 *)bp->dst - (uint32 *)_screen.dst_ptr) + bp->top * this->anim_buf_width + bp->left;
const byte *remap = bp->remap; // store so we don't have to access it via bp everytime
for (int y = 0; y < bp->height; y++) {
Colour *dst_ln = dst + bp->pitch;
uint16 *anim_ln = anim + this->anim_buf_width;
const Colour *src_px_ln = (const Colour *)((const byte *)src_px + *(const uint32 *)src_px);
src_px++;
const uint16 *src_n_ln = (const uint16 *)((const byte *)src_n + *(const uint32 *)src_n);
src_n += 2;
Colour *dst_end = dst + bp->skip_left;
uint n;
while (dst < dst_end) {
n = *src_n++;
if (src_px->a == 0) {
dst += n;
src_px ++;
src_n++;
if (dst > dst_end) anim += dst - dst_end;
} else {
if (dst + n > dst_end) {
uint d = dst_end - dst;
src_px += d;
src_n += d;
dst = dst_end - bp->skip_left;
dst_end = dst + bp->width;
n = min<uint>(n - d, (uint)bp->width);
goto draw;
}
dst += n;
src_px += n;
src_n += n;
}
}
dst -= bp->skip_left;
dst_end -= bp->skip_left;
dst_end += bp->width;
while (dst < dst_end) {
n = min<uint>(*src_n++, (uint)(dst_end - dst));
if (src_px->a == 0) {
anim += n;
dst += n;
src_px++;
src_n++;
continue;
}
draw:;
switch (mode) {
case BM_COLOUR_REMAP:
if (src_px->a == 255) {
do {
uint m = *src_n;
/* In case the m-channel is zero, do not remap this pixel in any way */
if (m == 0) {
*dst = src_px->data;
*anim = 0;
} else {
uint r = remap[GB(m, 0, 8)];
*anim = r | (m & 0xFF00);
if (r != 0) *dst = this->AdjustBrightness(this->LookupColourInPalette(r), GB(m, 8, 8));
}
anim++;
dst++;
src_px++;
src_n++;
} while (--n != 0);
} else {
do {
uint m = *src_n;
if (m == 0) {
*dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
*anim = 0;
} else {
uint r = remap[GB(m, 0, 8)];
*anim = 0;
if (r != 0) *dst = ComposeColourPANoCheck(this->AdjustBrightness(this->LookupColourInPalette(r), GB(m, 8, 8)), src_px->a, *dst);
}
anim++;
dst++;
src_px++;
src_n++;
} while (--n != 0);
}
break;
case BM_TRANSPARENT:
/* TODO -- We make an assumption here that the remap in fact is transparency, not some colour.
* This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
* we produce a result the newgrf maker didn't expect ;) */
/* Make the current colour a bit more black, so it looks like this image is transparent */
src_n += n;
if (src_px->a == 255) {
src_px += n;
do {
*dst = MakeTransparent(*dst, 3, 4);
*anim = 0;
anim++;
dst++;
} while (--n != 0);
} else {
do {
*dst = MakeTransparent(*dst, (256 * 4 - src_px->a), 256 * 4);
*anim = 0;
anim++;
dst++;
src_px++;
} while (--n != 0);
}
break;
default:
if (src_px->a == 255) {
do {
/* Compiler assumes pointer aliasing, can't optimise this on its own */
uint m = GB(*src_n, 0, 8);
/* Above PALETTE_ANIM_START is palette animation */
*anim++ = *src_n;
*dst++ = (m >= PALETTE_ANIM_START) ? this->AdjustBrightness(this->LookupColourInPalette(m), GB(*src_n, 8, 8)) : src_px->data;
src_px++;
src_n++;
} while (--n != 0);
} else {
do {
uint m = GB(*src_n, 0, 8);
*anim++ = 0;
if (m >= PALETTE_ANIM_START) {
*dst = ComposeColourPANoCheck(this->AdjustBrightness(this->LookupColourInPalette(m), GB(*src_n, 8, 8)), src_px->a, *dst);
} else {
*dst = ComposeColourRGBANoCheck(src_px->r, src_px->g, src_px->b, src_px->a, *dst);
}
dst++;
src_px++;
src_n++;
} while (--n != 0);
}
break;
}
}
anim = anim_ln;
dst = dst_ln;
src_px = src_px_ln;
src_n = src_n_ln;
}
}