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Better naming for the blit permutation variables
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@1bsyl
1bsyl committed Feb 9, 2019
1 parent f6a2ae6 commit 1aa2ad2
Showing 1 changed file with 81 additions and 80 deletions.
161 changes: 81 additions & 80 deletions src/video/SDL_blit_N.c
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Expand Up @@ -2152,53 +2152,54 @@ Blit4to4CopyAlpha(SDL_BlitInfo * info)
/* permutation for mapping srcfmt to dstfmt, overloading or not the alpha channel */
static void
get_permutation(SDL_PixelFormat *srcfmt, SDL_PixelFormat *dstfmt,
int *_r , int *_g, int *_b, int *_a, int *_missing)
int *_p0 , int *_p1, int *_p2, int *_p3, int *_alpha_channel)
{
int missing = 0, r, g, b, a = 0;
int alpha_channel = 0, p0, p1, p2, p3;
int Pixel = 0x04030201; /* identity permutation */

if (srcfmt->Amask) {
RGBA_FROM_PIXEL(Pixel, srcfmt, r, g, b, a);
RGBA_FROM_PIXEL(Pixel, srcfmt, p0, p1, p2, p3);
} else {
RGB_FROM_PIXEL(Pixel, srcfmt, r, g, b);
RGB_FROM_PIXEL(Pixel, srcfmt, p0, p1, p2);
p3 = 0;
}

if (dstfmt->Amask) {
if (srcfmt->Amask) {
PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, a);
PIXEL_FROM_RGBA(Pixel, dstfmt, p0, p1, p2, p3);
} else {
PIXEL_FROM_RGBA(Pixel, dstfmt, r, g, b, 0);
PIXEL_FROM_RGBA(Pixel, dstfmt, p0, p1, p2, 0);
}
} else {
PIXEL_FROM_RGB(Pixel, dstfmt, r, g, b);
PIXEL_FROM_RGB(Pixel, dstfmt, p0, p1, p2);
}

r = Pixel & 0xFF;
g = (Pixel >> 8) & 0xFF;
b = (Pixel >> 16) & 0xFF;
a = (Pixel >> 24) & 0xFF;

if (r == 0) {
r = 1;
missing = 0;
} else if (g == 0) {
g = 1;
missing = 1;
} else if (b == 0) {
b = 1;
missing = 2;
} else if (a == 0) {
a = 1;
missing = 3;
p0 = Pixel & 0xFF;
p1 = (Pixel >> 8) & 0xFF;
p2 = (Pixel >> 16) & 0xFF;
p3 = (Pixel >> 24) & 0xFF;

if (p0 == 0) {
p0 = 1;
alpha_channel = 0;
} else if (p1 == 0) {
p1 = 1;
alpha_channel = 1;
} else if (p2 == 0) {
p2 = 1;
alpha_channel = 2;
} else if (p3 == 0) {
p3 = 1;
alpha_channel = 3;
}

*_r = r - 1;
*_g = g - 1;
*_b = b - 1;
*_a = a - 1;
*_p0 = p0 - 1;
*_p1 = p1 - 1;
*_p2 = p2 - 1;
*_p3 = p3 - 1;

if (_missing) {
*_missing = missing;
if (_alpha_channel) {
*_alpha_channel = alpha_channel;
}
return;
}
Expand Down Expand Up @@ -2228,20 +2229,20 @@ BlitNtoN(SDL_BlitInfo * info)
Uint32 *dst32 = (Uint32*)dst;

/* Find the appropriate permutation */
int missing = 0, r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, &missing);
int alpha_channel, p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, &alpha_channel);

while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP(
{
Uint8 *s8 = (Uint8 *)src32;
Uint8 *d8 = (Uint8 *)dst32;
d8[0] = s8[r];
d8[1] = s8[g];
d8[2] = s8[b];
d8[3] = s8[a];
d8[missing] = alpha;
d8[0] = s8[p0];
d8[1] = s8[p1];
d8[2] = s8[p2];
d8[3] = s8[p3];
d8[alpha_channel] = alpha;
++src32;
++dst32;
}, width);
Expand All @@ -2259,17 +2260,17 @@ BlitNtoN(SDL_BlitInfo * info)
Uint32 *src32 = (Uint32*)src;

/* Find the appropriate permutation */
int r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, NULL);
int p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, NULL);

while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP(
{
Uint8 *s8 = (Uint8 *)src32;
dst[0] = s8[r];
dst[1] = s8[g];
dst[2] = s8[b];
dst[0] = s8[p0];
dst[1] = s8[p1];
dst[2] = s8[p2];
++src32;
dst += 3;
}, width);
Expand All @@ -2287,19 +2288,19 @@ BlitNtoN(SDL_BlitInfo * info)
Uint32 *dst32 = (Uint32*)dst;

/* Find the appropriate permutation */
int missing = 0, r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, &missing);
int alpha_channel, p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, &alpha_channel);

while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP(
{
Uint8 *d8 = (Uint8 *)dst32;
d8[0] = src[r];
d8[1] = src[g];
d8[2] = src[b];
d8[3] = src[a];
d8[missing] = alpha;
d8[0] = src[p0];
d8[1] = src[p1];
d8[2] = src[p2];
d8[3] = src[p3];
d8[alpha_channel] = alpha;
src += 3;
++dst32;
}, width);
Expand Down Expand Up @@ -2354,19 +2355,19 @@ BlitNtoNCopyAlpha(SDL_BlitInfo * info)
Uint32 *dst32 = (Uint32*)dst;

/* Find the appropriate permutation */
int r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, NULL);
int p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, NULL);

while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP(
{
Uint8 *s8 = (Uint8 *)src32;
Uint8 *d8 = (Uint8 *)dst32;
d8[0] = s8[r];
d8[1] = s8[g];
d8[2] = s8[b];
d8[3] = s8[a];
d8[0] = s8[p0];
d8[1] = s8[p1];
d8[2] = s8[p2];
d8[3] = s8[p3];
++src32;
++dst32;
}, width);
Expand Down Expand Up @@ -2566,8 +2567,8 @@ BlitNtoNKey(SDL_BlitInfo * info)
Uint32 *dst32 = (Uint32*)dst;

/* Find the appropriate permutation */
int missing = 0, r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, &missing);
int alpha_channel, p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, &alpha_channel);

while (height--) {
/* *INDENT-OFF* */
Expand All @@ -2576,11 +2577,11 @@ BlitNtoNKey(SDL_BlitInfo * info)
if ((*src32 & rgbmask) != ckey) {
Uint8 *s8 = (Uint8 *)src32;
Uint8 *d8 = (Uint8 *)dst32;
d8[0] = s8[r];
d8[1] = s8[g];
d8[2] = s8[b];
d8[3] = s8[a];
d8[missing] = alpha;
d8[0] = s8[p0];
d8[1] = s8[p1];
d8[2] = s8[p2];
d8[3] = s8[p3];
d8[alpha_channel] = alpha;
}
++src32;
++dst32;
Expand Down Expand Up @@ -2663,18 +2664,18 @@ BlitNtoNKey(SDL_BlitInfo * info)
Uint32 *src32 = (Uint32*)src;

/* Find the appropriate permutation */
int r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, NULL);
int p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, NULL);

while (height--) {
/* *INDENT-OFF* */
DUFFS_LOOP(
{
if ((*src32 & rgbmask) != ckey) {
Uint8 *s8 = (Uint8 *)src32;
dst[0] = s8[r];
dst[1] = s8[g];
dst[2] = s8[b];
dst[0] = s8[p0];
dst[1] = s8[p1];
dst[2] = s8[p2];
}
++src32;
dst += 3;
Expand All @@ -2697,8 +2698,8 @@ BlitNtoNKey(SDL_BlitInfo * info)
Uint8 k2 = (ckey >> 16) & 0xFF;

/* Find the appropriate permutation */
int missing = 0, r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, &missing);
int alpha_channel, p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, &alpha_channel);

while (height--) {
/* *INDENT-OFF* */
Expand All @@ -2710,11 +2711,11 @@ BlitNtoNKey(SDL_BlitInfo * info)

if (k0 != s0 || k1 != s1 || k2 != s2) {
Uint8 *d8 = (Uint8 *)dst32;
d8[0] = src[r];
d8[1] = src[g];
d8[2] = src[b];
d8[3] = src[a];
d8[missing] = alpha;
d8[0] = src[p0];
d8[1] = src[p1];
d8[2] = src[p2];
d8[3] = src[p3];
d8[alpha_channel] = alpha;
}
src += 3;
++dst32;
Expand Down Expand Up @@ -2812,8 +2813,8 @@ BlitNtoNKeyCopyAlpha(SDL_BlitInfo * info)
Uint32 *dst32 = (Uint32*)dst;

/* Find the appropriate permutation */
int r, g, b, a;
get_permutation(srcfmt, dstfmt, &r, &g, &b, &a, NULL);
int p0, p1, p2, p3;
get_permutation(srcfmt, dstfmt, &p0, &p1, &p2, &p3, NULL);

while (height--) {
/* *INDENT-OFF* */
Expand All @@ -2822,10 +2823,10 @@ BlitNtoNKeyCopyAlpha(SDL_BlitInfo * info)
if ((*src32 & rgbmask) != ckey) {
Uint8 *s8 = (Uint8 *)src32;
Uint8 *d8 = (Uint8 *)dst32;
d8[0] = s8[r];
d8[1] = s8[g];
d8[2] = s8[b];
d8[3] = s8[a];
d8[0] = s8[p0];
d8[1] = s8[p1];
d8[2] = s8[p2];
d8[3] = s8[p3];
}
++src32;
++dst32;
Expand Down

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