Commit 1aa2ad2fe8ac7337d7620b159b53ef3a5a2ed7d1
2019-02-09T17:40:32
Better naming for the blit permutation variables
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diff --git a/src/video/SDL_blit_N.c b/src/video/SDL_blit_N.c
index 5908285..c31cd9a 100644
--- a/src/video/SDL_blit_N.c
+++ b/src/video/SDL_blit_N.c
@@ -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;
}
@@ -2228,8 +2229,8 @@ 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* */
@@ -2237,11 +2238,11 @@ BlitNtoN(SDL_BlitInfo * info)
{
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);
@@ -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);
@@ -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);
@@ -2354,8 +2355,8 @@ 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* */
@@ -2363,10 +2364,10 @@ BlitNtoNCopyAlpha(SDL_BlitInfo * info)
{
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);
@@ -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* */
@@ -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;
@@ -2663,8 +2664,8 @@ 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* */
@@ -2672,9 +2673,9 @@ BlitNtoNKey(SDL_BlitInfo * info)
{
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;
@@ -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* */
@@ -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;
@@ -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* */
@@ -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;