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wrlib: do not create an alpha channel if the original image did not have it in RFlipImage

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As it does not cost anything in the current code to not add this channel,
it is then probably a good idea to keep the output image with the same
format as the input image, this avoid wasting +33% of memory for something
that may be at best unused and at worst will induce extra cost when
manipulating the image.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
This commit is contained in:
Christophe CURIS
2014-07-04 23:28:36 +02:00
committed by Carlos R. Mafra
parent f2dea1b840
commit cd29983e03
1 changed files with 10 additions and 14 deletions
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24
wrlib/flip.c
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@@ -35,32 +35,30 @@ RImage *RVerticalFlipImage(RImage *source)
RImage *target;
int nwidth, nheight;
int x, y;
int bpp = source->format == RRGBAFormat ? 4 : 3;
nwidth = source->width;
nheight = source->height;
target = RCreateImage(nwidth, nheight, True);
target = RCreateImage(nwidth, nheight, (source->format != RRGBFormat));
if (!target)
return NULL;
if (bpp == 3) {
if (source->format == RRGBFormat) {
unsigned char *optr, *nptr;
optr = source->data;
nptr = target->data + 4 * (nwidth * nheight - nwidth);
nptr = target->data + 3 * (nwidth * nheight - nwidth);
for (y = 0; y < nheight; y++) {
for (x = 0; x < nwidth; x++) {
nptr[0] = optr[0];
nptr[1] = optr[1];
nptr[2] = optr[2];
nptr[3] = 255;
optr += 3;
nptr += 4;
nptr += 3;
}
nptr -= (nwidth * 4) * 2;
nptr -= (nwidth * 3) * 2;
}
} else {
unsigned char *optr, *nptr;
@@ -89,32 +87,30 @@ RImage *RHorizontalFlipImage(RImage *source)
RImage *target;
int nwidth, nheight;
int x, y;
int bpp = source->format == RRGBAFormat ? 4 : 3;
nwidth = source->width;
nheight = source->height;
target = RCreateImage(nwidth, nheight, True);
target = RCreateImage(nwidth, nheight, (source->format != RRGBFormat));
if (!target)
return NULL;
if (bpp == 3) {
if (source->format == RRGBFormat) {
unsigned char *optr, *nptr;
optr = source->data;
nptr = target->data + 4 * (nwidth - 1);
nptr = target->data + 3 * (nwidth - 1);
for (y = nheight; y; y--) {
for (x = 0; x < nwidth; x++) {
nptr[0] = optr[0];
nptr[1] = optr[1];
nptr[2] = optr[2];
nptr[3] = 255;
optr += 3;
nptr -= 4;
nptr -= 3;
}
nptr += (nwidth * 4) * 2;
nptr += (nwidth * 3) * 2;
}
} else {
unsigned char *optr, *nptr;