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draw_bmp: fix IMGFMT_BGR32 use

This commit is contained in:
Rudolf Polzer 2012-10-22 17:28:36 +02:00 committed by wm4
parent 77016efd27
commit e1e056fe5d
1 changed files with 15 additions and 9 deletions
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24
sub/draw_bmp.c
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@ -255,14 +255,19 @@ static inline int min(int x, int y)
return y;
}
static void unpremultiply_and_split_bgra(mp_image_t *img, mp_image_t *alpha)
static void unpremultiply_and_split_IMGFMT_BGR32(mp_image_t *img,
mp_image_t *alpha)
{
int x, y;
for (y = 0; y < img->h; ++y) {
unsigned char *irow = &img->planes[0][img->stride[0] * y];
uint32_t *irow = (uint32_t *) &img->planes[0][img->stride[0] * y];
unsigned char *arow = &alpha->planes[0][alpha->stride[0] * y];
for (x = 0; x < img->w; ++x) {
unsigned char aval = irow[4 * x + 3];
uint32_t pval = irow[x];
unsigned char aval = (pval >> 24);
unsigned char rval = (pval >> 16) & 0xFF;
unsigned char gval = (pval >> 8) & 0xFF;
unsigned char bval = pval & 0xFF;
// multiplied = separate * alpha / 255
// separate = rint(multiplied * 255 / alpha)
// = floor(multiplied * 255 / alpha + 0.5)
@ -271,9 +276,10 @@ static void unpremultiply_and_split_bgra(mp_image_t *img, mp_image_t *alpha)
int div = (int) aval;
int add = div / 2;
if (aval) {
irow[4 * x + 0] = min(255, (irow[4 * x + 0] * 255 + add) / div);
irow[4 * x + 1] = min(255, (irow[4 * x + 1] * 255 + add) / div);
irow[4 * x + 2] = min(255, (irow[4 * x + 2] * 255 + add) / div);
rval = min(255, (rval * 255 + add) / div);
gval = min(255, (gval * 255 + add) / div);
bval = min(255, (bval * 255 + add) / div);
irow[x] = bval + (gval << 8) + (rval << 16) + (aval << 24);
}
arow[x] = aval;
}
@ -293,10 +299,10 @@ static bool sub_bitmap_to_mp_images(struct mp_image **sbi, int *color_yuv,
// swscale the bitmap from w*h to dw*dh, changing BGRA8 into YUV444P16
// and make a scaled copy of A8
mp_image_t *sbisrc = new_mp_image(sb->w, sb->h);
mp_image_setfmt(sbisrc, IMGFMT_BGRA);
mp_image_setfmt(sbisrc, IMGFMT_BGR32);
sbisrc->planes[0] = sb->bitmap;
sbisrc->stride[0] = sb->stride;
mp_image_t *sbisrc2 = alloc_mpi(sb->dw, sb->dh, IMGFMT_BGRA);
mp_image_t *sbisrc2 = alloc_mpi(sb->dw, sb->dh, IMGFMT_BGR32);
mp_image_swscale(sbisrc2, sbisrc, csp, SWS_BILINEAR);
// sbisrc2 now is the original image in premultiplied alpha, but
@ -304,7 +310,7 @@ static bool sub_bitmap_to_mp_images(struct mp_image **sbi, int *color_yuv,
// now, un-premultiply so we can work in YUV color space, also extract
// alpha
*sba = alloc_mpi(sb->dw, sb->dh, IMGFMT_Y8);
unpremultiply_and_split_bgra(sbisrc2, *sba);
unpremultiply_and_split_IMGFMT_BGR32(sbisrc2, *sba);
// convert to the output format
*sbi = alloc_mpi(sb->dw, sb->dh, imgfmt);