mirror of
https://github.com/reactos/reactos.git
synced 2024-07-14 00:25:05 +00:00
371 lines
7.8 KiB
C
371 lines
7.8 KiB
C
#include "fitz-base.h"
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#include "fitz-world.h"
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#include "fitz-draw.h"
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typedef unsigned char byte;
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static FORCEINLINE void srown(byte * restrict src, byte * restrict dst, unsigned w, unsigned denom, unsigned n)
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{
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unsigned x, left, k;
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unsigned sum[FZ_MAXCOLORS];
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left = 0;
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for (k = 0; k < n; k++)
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sum[k] = 0;
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for (x = 0; x < w; x++)
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{
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for (k = 0; k < n; k++)
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sum[k] += src[x * n + k];
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if (++left == denom)
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{
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left = 0;
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for (k = 0; k < n; k++)
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{
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dst[k] = sum[k] / denom;
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sum[k] = 0;
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}
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dst += n;
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}
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}
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/* left overs */
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if (left)
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for (k = 0; k < n; k++)
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dst[k] = sum[k] / left;
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}
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static inline void srownp2(byte * restrict src, byte * restrict dst, unsigned w, unsigned log2denom, unsigned n)
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{
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unsigned x, left, k;
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unsigned sum[FZ_MAXCOLORS];
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left = 0;
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for (k = 0; k < n; k++)
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sum[k] = 0;
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for (x = 0; x < w; x++)
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{
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for (k = 0; k < n; k++)
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sum[k] += src[x * n + k];
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if (++left == (1<<log2denom))
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{
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left = 0;
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for (k = 0; k < n; k++)
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{
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dst[k] = sum[k] >> log2denom;
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sum[k] = 0;
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}
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dst += n;
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}
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}
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/* left overs */
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if (left)
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for (k = 0; k < n; k++)
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dst[k] = sum[k] / left;
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}
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static FORCEINLINE void srow1d9(byte * restrict src, byte * restrict dst, unsigned w)
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{
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int left, runs;
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unsigned sum;
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left = w % 9;
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runs = w / 9;
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while (runs-- > 0)
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{
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sum = *src++;
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sum += *src++;
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sum += *src++;
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sum += *src++;
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sum += *src++;
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sum += *src++;
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sum += *src++;
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sum += *src++;
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sum += *src++;
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*dst++ = sum / 9;
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}
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/* left overs */
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if (left)
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{
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runs = left;
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sum = *src++;
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while (--runs > 0)
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sum += *src++;
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*dst = sum / left;
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}
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}
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static void srow1(byte *src, byte *dst, int w, int denom)
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{
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if (9 == denom)
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srow1d9(src, dst, w);
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else
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srown(src, dst, w, denom, 1);
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}
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static FORCEINLINE void srow2d3(byte *src, byte *dst, int w)
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{
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int left;
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int runs;
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unsigned sum0, sum1;
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left = w % 3;
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runs = w / 3;
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while (runs-- > 0)
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{
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sum0 = *src++;
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sum1 = *src++;
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sum0 += *src++;
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sum1 += *src++;
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sum0 += *src++;
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sum1 += *src++;
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*dst++ = sum0 / 3;
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*dst++ = sum1 / 3;
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}
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/* left overs */
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if (left)
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{
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sum0 = *src++;
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sum1 = *src++;
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if (2 == left)
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{
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sum0 += *src++;
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sum1 += *src++;
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}
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*dst++ = sum0 / left;
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*dst = sum1 / left;
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}
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}
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static void srow2(byte *src, byte *dst, int w, int denom)
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{
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if (3 == denom)
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srow2d3(src, dst, w);
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else
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srown(src, dst, w, denom, 2);
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}
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static void srow4(byte *src, byte *dst, int w, int denom)
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{
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srown(src, dst, w, denom, 4);
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}
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static void srow5(byte *src, byte *dst, int w, int denom)
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{
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srown(src, dst, w, denom, 5);
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}
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static void srow5p2(byte * restrict src, byte * restrict dst, int w, int log2denom)
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{
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srownp2(src, dst, w, log2denom, 5);
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}
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static FORCEINLINE void scoln(byte * restrict src, byte * restrict dst, int w, int denom, int n)
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{
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int x, y, k;
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byte *s;
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int sum[FZ_MAXCOLORS];
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for (x = 0; x < w; x++)
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{
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s = src + (x * n);
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for (k = 0; k < n; k++)
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sum[k] = 0;
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for (y = 0; y < denom; y++)
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for (k = 0; k < n; k++)
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sum[k] += s[y * w * n + k];
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for (k = 0; k < n; k++)
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dst[k] = sum[k] / denom;
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dst += n;
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}
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}
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static inline void scolnp2(byte *src, byte *dst, int w, int log2denom, int n)
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{
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int x, y, k;
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byte *s;
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int sum[FZ_MAXCOLORS];
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for (x = 0; x < w; x++)
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{
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s = src + (x * n);
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for (k = 0; k < n; k++)
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sum[k] = 0;
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for (y = 0; y < (1<<log2denom); y++)
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for (k = 0; k < n; k++)
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sum[k] += s[y * w * n + k];
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for (k = 0; k < n; k++)
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dst[k] = sum[k] >> log2denom;
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dst += n;
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}
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}
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static void scol1(byte *src, byte *dst, int w, int denom)
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{
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scoln(src, dst, w, denom, 1);
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}
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static FORCEINLINE void scol2d3(byte *src, byte *dst, int w)
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{
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byte *srcend;
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int sum0, sum1;
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int w2 = w * 2;
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srcend = src + w2;
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while (src < srcend)
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{
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sum0 = src[0];
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sum1 = src[1];
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sum0 += src[w2];
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sum1 += src[w2 + 1];
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sum0 += src[2 * w2];
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sum1 += src[2 * w2 + 1];
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*dst++ = sum0 / 3;
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*dst++ = sum1 / 3;
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src += 2;
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}
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}
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static void scol2(byte *src, byte *dst, int w, int denom)
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{
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if (3 == denom)
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scol2d3(src, dst, w);
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else
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scoln(src, dst, w, denom, 2);
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}
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static void scol4(byte *src, byte *dst, int w, int denom)
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{
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scoln(src, dst, w, denom, 4);
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}
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static void scol5(byte *src, byte *dst, int w, int denom)
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{
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scoln(src, dst, w, denom, 5);
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}
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static void scol5p2(byte *src, byte *dst, int w, int denom)
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{
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scolnp2(src, dst, w, denom, 5);
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}
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void (*fz_srown)(byte *src, byte *dst, int w, int denom, int n) = srown;
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void (*fz_srow1)(byte *src, byte *dst, int w, int denom) = srow1;
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void (*fz_srow2)(byte *src, byte *dst, int w, int denom) = srow2;
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void (*fz_srow4)(byte *src, byte *dst, int w, int denom) = srow4;
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void (*fz_srow5)(byte *src, byte *dst, int w, int denom) = srow5;
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void (*fz_scoln)(byte *src, byte *dst, int w, int denom, int n) = scoln;
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void (*fz_scol1)(byte *src, byte *dst, int w, int denom) = scol1;
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void (*fz_scol2)(byte *src, byte *dst, int w, int denom) = scol2;
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void (*fz_scol4)(byte *src, byte *dst, int w, int denom) = scol4;
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void (*fz_scol5)(byte *src, byte *dst, int w, int denom) = scol5;
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fz_error *
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fz_scalepixmap(fz_pixmap **dstp, fz_pixmap *src, int xdenom, int ydenom)
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{
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fz_error *error;
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fz_pixmap *dst;
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unsigned char *buf;
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int y, iy, oy;
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int ow, oh, n;
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int ydenom2 = ydenom;
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void (*srowx)(byte *src, byte *dst, int w, int denom) = nil;
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void (*scolx)(byte *src, byte *dst, int w, int denom) = nil;
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ow = (src->w + xdenom - 1) / xdenom;
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oh = (src->h + ydenom - 1) / ydenom;
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n = src->n;
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buf = fz_malloc(ow * n * ydenom);
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if (!buf)
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return fz_outofmem;
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error = fz_newpixmap(&dst, 0, 0, ow, oh, src->n);
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if (error)
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{
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fz_free(buf);
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return error;
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}
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switch (n)
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{
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case 1: srowx = fz_srow1; scolx = fz_scol1; break;
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case 2: srowx = fz_srow2; scolx = fz_scol2; break;
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case 4: srowx = fz_srow4; scolx = fz_scol4; break;
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case 5: srowx = fz_srow5; scolx = fz_scol5;
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if (!(xdenom & (xdenom - 1)))
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{
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unsigned v = xdenom;
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xdenom = 0;
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while ((v >>= 1)) xdenom++;
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srowx = srow5p2;
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}
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if (!(ydenom & (ydenom - 1)))
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{
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unsigned v = ydenom2;
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ydenom2 = 0;
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while ((v >>= 1)) ydenom2++;
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scolx = scol5p2;
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}
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break;
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}
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if (srowx && scolx)
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{
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for (y = 0, oy = 0; y < (src->h / ydenom) * ydenom; y += ydenom, oy++)
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{
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for (iy = 0; iy < ydenom; iy++)
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srowx(src->samples + (y + iy) * src->w * n,
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buf + iy * ow * n,
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src->w, xdenom);
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scolx(buf, dst->samples + oy * dst->w * n, dst->w, ydenom2);
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}
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ydenom = src->h - y;
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if (ydenom)
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{
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for (iy = 0; iy < ydenom; iy++)
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srowx(src->samples + (y + iy) * src->w * n,
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buf + iy * ow * n,
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src->w, xdenom);
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scolx(buf, dst->samples + oy * dst->w * n, dst->w, ydenom2);
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}
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}
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else
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{
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for (y = 0, oy = 0; y < (src->h / ydenom) * ydenom; y += ydenom, oy++)
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{
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for (iy = 0; iy < ydenom; iy++)
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fz_srown(src->samples + (y + iy) * src->w * n,
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buf + iy * ow * n,
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src->w, xdenom, n);
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fz_scoln(buf, dst->samples + oy * dst->w * n, dst->w, ydenom2, n);
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}
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ydenom = src->h - y;
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if (ydenom)
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{
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for (iy = 0; iy < ydenom; iy++)
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fz_srown(src->samples + (y + iy) * src->w * n,
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buf + iy * ow * n,
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src->w, xdenom, n);
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fz_scoln(buf, dst->samples + oy * dst->w * n, dst->w, ydenom2, n);
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}
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}
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fz_free(buf);
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*dstp = dst;
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return nil;
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}
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