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author | Carl Eugen Hoyos <cehoyos@ag.or.at> | 2012-01-31 00:03:26 +0100 |
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committer | Carl Eugen Hoyos <cehoyos@ag.or.at> | 2012-01-31 00:03:26 +0100 |
commit | ea604de91eaa69dece127a3755ba5d39705428af (patch) | |
tree | afeea8e45c77024d05217b7a2eaef5f38320d413 | |
parent | f0d6828dbe308b277525d3df19c0014833be2271 (diff) | |
download | ffmpeg-ea604de91eaa69dece127a3755ba5d39705428af.tar.gz |
Simplify "deloco" and support decoding of 48bit loco png.
-rw-r--r-- | libavcodec/pngdec.c | 84 |
1 files changed, 31 insertions, 53 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 392395aac7..75f882c6ca 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -260,46 +260,21 @@ static void png_filter_row(PNGDSPContext *dsp, uint8_t *dst, int filter_type, } } -static av_always_inline void convert_to_rgb32_loco(uint8_t *dst, const uint8_t *src, int width, int loco) -{ - int j; - unsigned int r, g, b, a; - - for(j = 0;j < width; j++) { - r = src[0]; - g = src[1]; - b = src[2]; - a = src[3]; - if(loco) { - r = (r+g)&0xff; - b = (b+g)&0xff; - } - dst[0] = r; - dst[1] = g; - dst[2] = b; - dst[3] = a; - dst += 4; - src += 4; - } +/* This used to be called "deloco" in FFmpeg + * and is actually an inverse reversible colorspace transformation */ +#define YUV2RGB(NAME, TYPE) \ +static void deloco_ ## NAME(TYPE *dst, int size, int alpha) \ +{ \ + int i; \ + for (i = 0; i < size; i += 3 + alpha) { \ + int g = dst [i+1]; \ + dst[i+0] += g; \ + dst[i+2] += g; \ + } \ } -static void convert_to_rgb32(uint8_t *dst, const uint8_t *src, int width, int loco) -{ - if(loco) - convert_to_rgb32_loco(dst, src, width, 1); - else - memcpy(dst, src, width * 4); -} - -static void deloco_rgb24(uint8_t *dst, int size) -{ - int i; - for(i=0; i<size; i+=3) { - int g = dst[i+1]; - dst[i+0] += g; - dst[i+2] += g; - } -} +YUV2RGB(rgb8, uint8_t) +YUV2RGB(rgb16, uint16_t) /* process exactly one decompressed row */ static void png_handle_row(PNGDecContext *s) @@ -309,14 +284,6 @@ static void png_handle_row(PNGDecContext *s) if (!s->interlace_type) { ptr = s->image_buf + s->image_linesize * s->y; - /* need to swap bytes correctly for RGB_ALPHA */ - if (s->color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - png_filter_row(s, s->tmp_row, s->crow_buf[0], s->crow_buf + 1, - s->last_row, s->row_size, s->bpp); - convert_to_rgb32(ptr, s->tmp_row, s->width, s->filter_type == PNG_FILTER_TYPE_LOCO); - FFSWAP(uint8_t*, s->last_row, s->tmp_row); - } else { - /* in normal case, we avoid one copy */ if (s->y == 0) last_row = s->last_row; else @@ -324,17 +291,28 @@ static void png_handle_row(PNGDecContext *s) png_filter_row(s, ptr, s->crow_buf[0], s->crow_buf + 1, last_row, s->row_size, s->bpp); - } /* loco lags by 1 row so that it doesn't interfere with top prediction */ - if (s->filter_type == PNG_FILTER_TYPE_LOCO && - s->color_type == PNG_COLOR_TYPE_RGB && s->y > 0) - deloco_rgb24(ptr - s->image_linesize, s->row_size); + if (s->filter_type == PNG_FILTER_TYPE_LOCO && s->y > 0) { + if (s->bit_depth == 16) { + deloco_rgb16((uint16_t *)(ptr - s->image_linesize), s->row_size / 2, + s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); + } else { + deloco_rgb8(ptr - s->image_linesize, s->row_size, + s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); + } + } s->y++; if (s->y == s->height) { s->state |= PNG_ALLIMAGE; - if (s->filter_type == PNG_FILTER_TYPE_LOCO && - s->color_type == PNG_COLOR_TYPE_RGB) - deloco_rgb24(ptr, s->row_size); + if (s->filter_type == PNG_FILTER_TYPE_LOCO) { + if (s->bit_depth == 16) { + deloco_rgb16((uint16_t *)ptr, s->row_size / 2, + s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); + } else { + deloco_rgb8(ptr, s->row_size, + s->color_type == PNG_COLOR_TYPE_RGB_ALPHA); + } + } } } else { got_line = 0; |