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further code cleanup and some documentation

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svn path=/trunk/; revision=26752
This commit is contained in:
Sven Neumann
2008-08-25 10:26:41 +00:00
parent c206db2c2a
commit 5970750152
1 changed files with 150 additions and 140 deletions
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290
app/paint-funcs/scale-region.c
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@ -38,135 +38,137 @@
(((h) + (TILE_HEIGHT - 1)) / TILE_HEIGHT)) (((h) + (TILE_HEIGHT - 1)) / TILE_HEIGHT))
static void scale_region_buffer (PixelRegion *srcPR, static void scale_determine_levels (PixelRegion *srcPR,
PixelRegion *dstPR, PixelRegion *dstPR,
GimpInterpolationType interpolation, gint *levelx,
GimpProgressFunc progress_callback, gint *levely);
gpointer progress_data); static gint scale_determine_progress (PixelRegion *srcPR,
static void scale_region_tile (PixelRegion *srcPR, PixelRegion *dstPR,
PixelRegion *dstPR, gint levelx,
GimpInterpolationType interpolation, gint levely);
GimpProgressFunc progress_callback,
gpointer progress_data); static void scale_region_buffer (PixelRegion *srcPR,
static void scale (TileManager *srcTM, PixelRegion *dstPR,
TileManager *dstTM, GimpInterpolationType interpolation,
GimpInterpolationType interpolation, GimpProgressFunc progress_callback,
GimpProgressFunc progress_callback, gpointer progress_data);
gpointer progress_data, static void scale_region_tile (PixelRegion *srcPR,
gint *progress, PixelRegion *dstPR,
gint max_progress); GimpInterpolationType interpolation,
static void scale_pr (PixelRegion *srcPR, GimpProgressFunc progress_callback,
PixelRegion *dstPR, gpointer progress_data);
GimpInterpolationType interpolation); static void scale (TileManager *srcTM,
static void interpolate_bilinear (TileManager *srcTM, TileManager *dstTM,
const gint x0, GimpInterpolationType interpolation,
const gint y0, GimpProgressFunc progress_callback,
const gint x1, gpointer progress_data,
const gint y1, gint *progress,
const gdouble xfrac, gint max_progress);
const gdouble yfrac, static void scale_pr (PixelRegion *srcPR,
guchar *pixel); PixelRegion *dstPR,
static void interpolate_nearest (TileManager *srcTM, GimpInterpolationType interpolation);
const gint x0,
const gint y0, static void interpolate_bilinear (TileManager *srcTM,
const gint x1, const gint x0,
const gint y1, const gint y0,
const gdouble xfrac, const gint x1,
const gdouble yfrac, const gint y1,
guchar *pixel); const gdouble xfrac,
static void interpolate_cubic (TileManager *srcTM, const gdouble yfrac,
const gint x0, guchar *pixel);
const gint y0, static void interpolate_nearest (TileManager *srcTM,
const gdouble xfrac, const gint x0,
const gdouble yfrac, const gint y0,
guchar *pixel); const gint x1,
static void decimate_gauss (TileManager *srcTM, const gint y1,
const gint x0, const gdouble xfrac,
const gint y0, const gdouble yfrac,
guchar *pixel); guchar *pixel);
static void decimate_average (TileManager *srcTM, static void interpolate_cubic (TileManager *srcTM,
const gint x0, const gint x0,
const gint y0, const gint y0,
const gint x1, const gdouble xfrac,
const gint y1, const gdouble yfrac,
guchar *pixel); guchar *pixel);
static gfloat * create_lanczos3_lookup (void); static void decimate_gauss (TileManager *srcTM,
static void interpolate_lanczos3 (TileManager *srcTM, const gint x0,
const gint x0, const gint y0,
const gint y0, guchar *pixel);
const gint x1, static void decimate_average (TileManager *srcTM,
const gint y1, const gint x0,
const gdouble xfrac, const gint y0,
const gdouble yfrac, const gint x1,
guchar *pixel, const gint y1,
const gfloat *kernel_lookup); guchar *pixel);
static void decimate_average_pr (PixelRegion *srcPR, static gfloat * create_lanczos3_lookup (void);
const gint x0, static void interpolate_lanczos3 (TileManager *srcTM,
const gint y0, const gint x0,
const gint x1, const gint y0,
const gint y1, const gint x1,
guchar *pixel); const gint y1,
static void interpolate_bilinear_pr (PixelRegion *srcPR, const gdouble xfrac,
const gint x0, const gdouble yfrac,
const gint y0, guchar *pixel,
const gint x1, const gfloat *kernel_lookup);
const gint y1, static void decimate_average_pr (PixelRegion *srcPR,
const gdouble xfrac, const gint x0,
const gdouble yfrac, const gint y0,
guchar *pixel); const gint x1,
static void determine_levels (PixelRegion *srcPR, const gint y1,
PixelRegion *dstPR, guchar *pixel);
gint *levelx, static void interpolate_bilinear_pr (PixelRegion *srcPR,
gint *levely); const gint x0,
static gint determine_progress (PixelRegion *srcPR, const gint y0,
PixelRegion *dstPR, const gint x1,
gint levelx, const gint y1,
gint levely); const gdouble xfrac,
static inline void gaussan_lanczos2 (const guchar *pixels, const gdouble yfrac,
const gint bytes, guchar *pixel);
guchar *pixel); static inline void gaussan_lanczos2 (const guchar *pixels,
static inline void decimate_lanczos2 (TileManager *srcTM, const gint bytes,
const gint x0, guchar *pixel);
const gint y0, static inline void decimate_lanczos2 (TileManager *srcTM,
guchar *pixel); const gint x0,
static inline void pixel_average (const guchar *p1, const gint y0,
const guchar *p2, guchar *pixel);
const guchar *p3, static inline void pixel_average (const guchar *p1,
const guchar *p4, const guchar *p2,
guchar *pixel, const guchar *p3,
const gint bytes); const guchar *p4,
static inline void gaussan_decimate (const guchar *pixels, guchar *pixel,
const gint bytes, const gint bytes);
guchar *pixel); static inline void gaussan_decimate (const guchar *pixels,
static inline gdouble cubic_spline_fit (const gdouble dx, const gint bytes,
const gint pt0, guchar *pixel);
const gint pt1, static inline gdouble cubic_spline_fit (const gdouble dx,
const gint pt2, const gint pt0,
const gint pt3); const gint pt1,
static inline gdouble weighted_sum (const gdouble dx, const gint pt2,
const gdouble dy, const gint pt3);
const gint s00, static inline gdouble weighted_sum (const gdouble dx,
const gint s10, const gdouble dy,
const gint s01, const gint s00,
const gint s11); const gint s10,
static inline gdouble sinc (const gdouble x); const gint s01,
static inline gdouble lanczos3_mul_alpha (const guchar *pixels, const gint s11);
const gdouble *x_kernel, static inline gdouble sinc (const gdouble x);
const gdouble *y_kernel, static inline gdouble lanczos3_mul_alpha (const guchar *pixels,
const gint bytes, const gdouble *x_kernel,
const gint byte); const gdouble *y_kernel,
static inline gdouble lanczos3_mul (const guchar *pixels, const gint bytes,
const gdouble *x_kernel, const gint byte);
const gdouble *y_kernel, static inline gdouble lanczos3_mul (const guchar *pixels,
const gint bytes, const gdouble *x_kernel,
const gint byte); const gdouble *y_kernel,
const gint bytes,
const gint byte);
static void static void
determine_levels (PixelRegion *srcPR, scale_determine_levels (PixelRegion *srcPR,
PixelRegion *dstPR, PixelRegion *dstPR,
gint *levelx, gint *levelx,
gint *levely) gint *levely)
{ {
gdouble scalex = (gdouble) dstPR->w / (gdouble) srcPR->w; gdouble scalex = (gdouble) dstPR->w / (gdouble) srcPR->w;
gdouble scaley = (gdouble) dstPR->h / (gdouble) srcPR->h; gdouble scaley = (gdouble) dstPR->h / (gdouble) srcPR->h;
@ -203,16 +205,22 @@ determine_levels (PixelRegion *srcPR,
} }
} }
/* This function calculates the number of tiles that are written in
* one scale operation. This number is used as the max_progress
* parameter in calls to GimpProgressFunc.
*/
static gint static gint
determine_progress (PixelRegion *srcPR, scale_determine_progress (PixelRegion *srcPR,
PixelRegion *dstPR, PixelRegion *dstPR,
gint levelx, gint levelx,
gint levely) gint levely)
{ {
gint width = srcPR->w; gint width = srcPR->w;
gint height = srcPR->h; gint height = srcPR->h;
gint tiles = 0; gint tiles = 0;
/* The logic here should be kept in sync with scale_region_buffer(). */
while (levelx < 0 && levely < 0) while (levelx < 0 && levely < 0)
{ {
width <<= 1; width <<= 1;
@ -287,8 +295,8 @@ scale_region_buffer (PixelRegion *srcPR,
gint levely = 0; gint levely = 0;
/* determine scaling levels */ /* determine scaling levels */
determine_levels (srcPR, dstPR, &levelx, &levely); scale_determine_levels (srcPR, dstPR, &levelx, &levely);
max_progress = determine_progress (srcPR, dstPR, levelx, levely); max_progress = scale_determine_progress (srcPR, dstPR, levelx, levely);
pixel_region_init_data (&tmpPR0, pixel_region_init_data (&tmpPR0,
g_memdup (srcPR->data, width * height * bytes), g_memdup (srcPR->data, width * height * bytes),
@ -431,8 +439,8 @@ scale_region_tile (PixelRegion *srcPR,
gint levely = 0; gint levely = 0;
/* determine scaling levels */ /* determine scaling levels */
determine_levels (srcPR, dstPR, &levelx, &levely); scale_determine_levels (srcPR, dstPR, &levelx, &levely);
max_progress = determine_progress (srcPR, dstPR, levelx, levely); max_progress = scale_determine_progress (srcPR, dstPR, levelx, levely);
if (levelx == 0 && levely == 0) if (levelx == 0 && levely == 0)
{ {
@ -637,7 +645,7 @@ scale (TileManager *srcTM,
decimate_average (srcTM, sx0, sy0, sx1, sy1, pixel); decimate_average (srcTM, sx0, sy0, sx1, sy1, pixel);
else else
interpolate_bilinear (srcTM, sx0, sy0, sx1, sy1, interpolate_bilinear (srcTM, sx0, sy0, sx1, sy1,
xfrac, yfrac, pixel); xfrac, yfrac, pixel);
break; break;
case GIMP_INTERPOLATION_CUBIC: case GIMP_INTERPOLATION_CUBIC:
@ -653,8 +661,7 @@ scale (TileManager *srcTM,
decimate_lanczos2 (srcTM, sx0, sy0, pixel); decimate_lanczos2 (srcTM, sx0, sy0, pixel);
else else
interpolate_lanczos3 (srcTM, sx0, sy0, sx1, sy1, interpolate_lanczos3 (srcTM, sx0, sy0, sx1, sy1,
xfrac, yfrac, pixel, xfrac, yfrac, pixel, kernel_lookup);
kernel_lookup);
break; break;
} }
@ -1234,7 +1241,8 @@ interpolate_bilinear (TileManager *srcTM,
alphasum = weighted_sum (xfrac, yfrac, p1[1], p2[1], p3[1], p4[1]); alphasum = weighted_sum (xfrac, yfrac, p1[1], p2[1], p3[1], p4[1]);
if (alphasum > 0) if (alphasum > 0)
{ {
sum = weighted_sum (xfrac, yfrac, p1[0] * p1[1], p2[0] * p2[1], sum = weighted_sum (xfrac, yfrac,
p1[0] * p1[1], p2[0] * p2[1],
p3[0] * p3[1], p4[0] * p4[1]); p3[0] * p3[1], p4[0] * p4[1]);
sum /= alphasum; sum /= alphasum;
@ -1261,7 +1269,8 @@ interpolate_bilinear (TileManager *srcTM,
{ {
for (b = 0; b < 3; b++) for (b = 0; b < 3; b++)
{ {
sum = weighted_sum (xfrac, yfrac, p1[b] * p1[3], p2[b] * p2[3], sum = weighted_sum (xfrac, yfrac,
p1[b] * p1[3], p2[b] * p2[3],
p3[b] * p3[3], p4[b] * p4[3]); p3[b] * p3[3], p4[b] * p4[3]);
sum /= alphasum; sum /= alphasum;
pixel[b] = (guchar) CLAMP (sum, 0, 255); pixel[b] = (guchar) CLAMP (sum, 0, 255);
@ -1495,7 +1504,8 @@ interpolate_lanczos3 (TileManager *srcTM,
gint b, i; gint b, i;
gint x, y; gint x, y;
gdouble kx_sum, ky_sum; gdouble kx_sum, ky_sum;
gdouble x_kernel[6], y_kernel[6]; gdouble x_kernel[6];
gdouble y_kernel[6];
guchar pixels[36 * 4]; guchar pixels[36 * 4];
gdouble sum, alphasum; gdouble sum, alphasum;