+++ /dev/null
-/* babl - dynamically extendable universal pixel conversion library.
- * Copyright (C) 2005, Øyvind Kolås.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General
- * Public License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-/* FIXME: this file should be renamed model-gray.c */
-
-#include "babl.h"
-#include "util.h"
-#include "rgb-constants.h"
-#include "math.h"
-
-static void components (void);
-static void models (void);
-static void conversions (void);
-
-void babl_base_model_gray (void)
-{
- components ();
- models ();
- conversions ();
-}
-
-static void
-components (void)
-{
- babl_component_new (
- "Y",
- "id", BABL_LUMINANCE,
- "luma",
- NULL);
-
- babl_component_new (
- "Y*A",
- "id", BABL_LUMINANCE_MUL_ALPHA,
- "luma",
- NULL);
-
- babl_component_new (
- "Y-g2.2",
- "id", BABL_LUMINANCE_GAMMA_2_2,
- "luma",
- NULL);
-}
-
-static void
-models (void)
-{
- babl_model_new (
- "gray",
- "id", BABL_GRAY,
- babl_component_id (BABL_LUMINANCE),
- NULL);
-
- babl_model_new (
- "gray-g2.2",
- "id", BABL_GRAY_GAMMA_2_2,
- babl_component_id (BABL_LUMINANCE_GAMMA_2_2),
- NULL);
-
- babl_model_new (
- "graya-g2.2",
- "id", BABL_GRAY_GAMMA_2_2_ALPHA,
- babl_component_id (BABL_LUMINANCE_GAMMA_2_2),
- babl_component_id (BABL_ALPHA),
- NULL);
-
- babl_model_new (
- "graya",
- "id", BABL_GRAY_ALPHA,
- babl_component_id (BABL_LUMINANCE),
- babl_component_id (BABL_ALPHA),
- NULL);
-
- babl_model_new (
- "grayA",
- "id", BABL_GRAY_ALPHA_PREMULTIPLIED,
- babl_component_id (BABL_LUMINANCE_MUL_ALPHA),
- babl_component_id (BABL_ALPHA),
- NULL);
-
-}
-
-
-static void
-rgb_to_gray (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY
- while (n--)
- {
- double red, green, blue;
- double luminance, alpha;
-
- red = *(double *)src[0];
- green = *(double *)src[1];
- blue = *(double *)src[2];
- if (src_bands>3)
- alpha = *(double *)src[3];
- else
- alpha = 1.0;
-
- luminance = red * RGB_LUMINANCE_RED +
- green * RGB_LUMINANCE_GREEN +
- blue * RGB_LUMINANCE_BLUE;
- *(double*)dst[0] = luminance;
-
- if (dst_bands==2)
- *(double*)dst[1] = alpha;
-
- BABL_PLANAR_STEP
- }
-}
-
-
-static void
-rgb_to_gray_2_2 (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY
- while (n--)
- {
- double red, green, blue;
- double luminance, alpha;
-
- red = *(double *) src[0];
- green = *(double *) src[1];
- blue = *(double *) src[2];
- if (src_bands>3)
- alpha = *(double *)src[3];
- else
- alpha = 1.0;
-
- luminance = red * RGB_LUMINANCE_RED +
- green * RGB_LUMINANCE_GREEN +
- blue * RGB_LUMINANCE_BLUE;
- *(double*)dst[0] = linear_to_gamma_2_2 (luminance);
-
- if (dst_bands==2)
- *(double*)dst[1] = alpha;
-
- BABL_PLANAR_STEP
- }
-}
-
-
-static void
-gray_2_2_to_rgb (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY
- while (n--)
- {
- double luminance;
- double red, green, blue;
- double alpha;
-
- luminance = gamma_2_2_to_linear (*(double *)src[0]);
- red = luminance;
- green = luminance;
- blue = luminance;
- if (src_bands > 1)
- alpha = *(double *)src[1];
- else
- alpha = 1.0;
-
- *(double*)dst[0] = red;
- *(double*)dst[1] = green;
- *(double*)dst[2] = blue;
-
- if (dst_bands>3)
- *(double*)dst[3] = alpha;
-
- BABL_PLANAR_STEP
- }
-}
-
-
-
-static void
-gray_to_rgb (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY
- while (n--)
- {
- double luminance;
- double red, green, blue;
- double alpha;
-
- luminance = *(double *)src[0];
- red = luminance;
- green = luminance;
- blue = luminance;
- if (src_bands > 1)
- alpha = *(double *)src[1];
- else
- alpha = 1.0;
-
- *(double*)dst[0] = red;
- *(double*)dst[1] = green;
- *(double*)dst[2] = blue;
-
- if (dst_bands>3)
- *(double*)dst[3] = alpha;
-
- BABL_PLANAR_STEP
- }
-}
-
-static void
-gray_alpha_premultiplied_to_rgba (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY
- assert (src_bands == 2);
- assert (dst_bands == 4);
-
- while (n--)
- {
- double luminance = *(double *)src[0];
- double alpha = *(double *)src[1];
-
- if (alpha > 0.001)
- {
- luminance = luminance / alpha;
- }
- else
- {
- luminance = 0.0;
- }
-
- *(double*)dst[0] = luminance;
- *(double*)dst[1] = luminance;
- *(double*)dst[2] = luminance;
- *(double*)dst[3] = alpha;
- BABL_PLANAR_STEP
- }
-}
-
-
-static void
-rgba_to_gray_alpha_premultiplied (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY;
- assert (src_bands == 4);
- assert (dst_bands == 2);
-
- while (n--)
- {
- double red = *(double *)src[0];
- double green = *(double *)src[1];
- double blue = *(double *)src[2];
- double alpha = *(double *)src[3];
- double luminance;
-
- luminance = red * RGB_LUMINANCE_RED +
- green * RGB_LUMINANCE_GREEN +
- blue * RGB_LUMINANCE_BLUE;
-
- luminance *= alpha;
-
- *(double*)dst[0] = luminance;
- *(double*)dst[2] = alpha;
- BABL_PLANAR_STEP
- }
-}
-
-static void
-non_premultiplied_to_premultiplied (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY
-
- while (n--)
- {
- double alpha;
- int band;
-
- alpha = *(double *)src[src_bands-1];
- for (band=0; band<src_bands-1;band++)
- {
- *(double*)dst[band] = *(double*) src[band] * alpha;
- }
- *(double*)dst[dst_bands-1] = alpha;
-
- BABL_PLANAR_STEP
- }
-}
-
-static void
-premultiplied_to_non_premultiplied (int src_bands,
- void **src,
- int *src_pitch,
- int dst_bands,
- void **dst,
- int *dst_pitch,
- int n)
-{
- BABL_PLANAR_SANITY
-
- while (n--)
- {
- double alpha;
- int band;
-
- alpha = *(double *)src[src_bands-1];
- for (band=0; band<src_bands-1;band++)
- {
- if (alpha>0.001)
- {
- *(double*)dst[band] = *(double*) src[band] / alpha;
- }
- else
- {
- *(double*)dst[band] = 0.001;
- }
- }
- *(double*)dst[dst_bands-1] = alpha;
-
- BABL_PLANAR_STEP
- }
-}
-
-static void
-conversions (void)
-{
- babl_conversion_new (
- "babl-base: gray-g2.2 to rgba",
- "source", babl_model_id (BABL_GRAY_GAMMA_2_2),
- "destination", babl_model_id (BABL_RGBA),
- "planar", gray_2_2_to_rgb,
- NULL
- );
-
-
- babl_conversion_new (
- "babl-base: rgba to gray-g2.2",
- "source", babl_model_id (BABL_RGBA),
- "destination", babl_model_id (BABL_GRAY_GAMMA_2_2),
- "planar", rgb_to_gray_2_2,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: graya-g2.2 to rgba",
- "source", babl_model_id (BABL_GRAY_GAMMA_2_2_ALPHA),
- "destination", babl_model_id (BABL_RGBA),
- "planar", gray_2_2_to_rgb,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: rgba to graya-g2.2",
- "source", babl_model_id (BABL_RGBA),
- "destination", babl_model_id (BABL_GRAY_GAMMA_2_2_ALPHA),
- "planar", rgb_to_gray_2_2,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: gray to rgba",
- "source", babl_model_id (BABL_GRAY),
- "destination", babl_model_id (BABL_RGBA),
- "planar", gray_to_rgb,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: gray to rgb",
- "source", babl_model_id (BABL_GRAY),
- "destination", babl_model_id (BABL_RGB),
- "planar", gray_to_rgb,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: gray-alpha to rgba",
- "source", babl_model_id (BABL_GRAY_ALPHA),
- "destination", babl_model_id (BABL_RGBA),
- "planar", gray_to_rgb,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: gray-alpha to rgb",
- "source", babl_model_id (BABL_GRAY_ALPHA),
- "destination", babl_model_id (BABL_RGB),
- "planar", gray_to_rgb,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: rgba to gray-alpha",
- "source", babl_model_id (BABL_RGBA),
- "destination", babl_model_id (BABL_GRAY_ALPHA),
- "planar", rgb_to_gray,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: rgba to gray",
- "source", babl_model_id (BABL_RGBA),
- "destination", babl_model_id (BABL_GRAY),
- "planar", rgb_to_gray,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: rgb to gray-alpha",
- "source", babl_model_id (BABL_RGB),
- "destination", babl_model_id (BABL_GRAY_ALPHA),
- "planar", rgb_to_gray,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: rgb to gray",
- "source", babl_model_id (BABL_RGB),
- "destination", babl_model_id (BABL_GRAY),
- "planar", rgb_to_gray,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: gray-alpha to gray-alpha-premultiplied",
- "source", babl_model_id (BABL_GRAY_ALPHA),
- "destination", babl_model_id (BABL_GRAY_ALPHA_PREMULTIPLIED),
- "planar", non_premultiplied_to_premultiplied,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: gray-alpha-premultuplied to gray-alpha",
- "source", babl_model_id (BABL_GRAY_ALPHA_PREMULTIPLIED),
- "destination", babl_model_id (BABL_GRAY_ALPHA),
- "planar", premultiplied_to_non_premultiplied,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: gray-alpha-premultiplied to rgba",
- "source", babl_model_id (BABL_GRAY_ALPHA_PREMULTIPLIED),
- "destination", babl_model_id (BABL_RGBA),
- "planar", gray_alpha_premultiplied_to_rgba,
- NULL
- );
-
- babl_conversion_new (
- "babl-base: rgba to gray-alpha-premultiplied",
- "source", babl_model_id (BABL_RGBA),
- "destination", babl_model_id (BABL_GRAY_ALPHA_PREMULTIPLIED),
- "planar", rgba_to_gray_alpha_premultiplied,
- NULL
- );
-}
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