src/video/SDL_gamma.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 15 Sep 2008 06:33:23 +0000
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parent 2735 204be4fc2726
child 2859 99210400e8b9
permissions -rw-r--r--
Expanded the libm support and put it into a separate directory.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* Gamma correction support */
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#include "../libm/math.h"
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#include "SDL_sysvideo.h"
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static void
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CalculateGammaRamp(float gamma, Uint16 * ramp)
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{
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    int i;
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    /* 0.0 gamma is all black */
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    if (gamma <= 0.0f) {
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        for (i = 0; i < 256; ++i) {
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            ramp[i] = 0;
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        }
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        return;
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    } else
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        /* 1.0 gamma is identity */
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    if (gamma == 1.0f) {
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        for (i = 0; i < 256; ++i) {
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            ramp[i] = (i << 8) | i;
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        }
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        return;
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    } else
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        /* Calculate a real gamma ramp */
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    {
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        int value;
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        gamma = 1.0f / gamma;
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        for (i = 0; i < 256; ++i) {
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            value = (int) (pow((double) i / 256.0, gamma) * 65535.0 + 0.5);
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            if (value > 65535) {
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                value = 65535;
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            }
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            ramp[i] = (Uint16) value;
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        }
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    }
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}
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static void
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CalculateGammaFromRamp(float *gamma, Uint16 * ramp)
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{
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    /* The following is adapted from a post by Garrett Bass on OpenGL
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       Gamedev list, March 4, 2000.
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     */
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    float sum = 0.0f;
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    int i, count = 0;
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    *gamma = 1.0;
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    for (i = 1; i < 256; ++i) {
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        if ((ramp[i] != 0) && (ramp[i] != 65535)) {
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            double B = (double) i / 256.0;
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            double A = ramp[i] / 65535.0;
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            sum += (float) (log(A) / log(B));
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            count++;
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        }
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    }
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    if (count && sum > 0.0f) {
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        *gamma = 1.0f / (sum / count);
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    }
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}
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int
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SDL_SetGamma(float red, float green, float blue)
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{
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    Uint16 ramp[3][256];
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    CalculateGammaRamp(red, ramp[0]);
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    CalculateGammaRamp(green, ramp[1]);
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    CalculateGammaRamp(blue, ramp[2]);
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    return SDL_SetGammaRamp(ramp[0], ramp[1], ramp[2]);
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}
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/* Calculating the gamma by integrating the gamma ramps isn't exact,
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   so this function isn't officially supported.
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*/
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int
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SDL_GetGamma(float *red, float *green, float *blue)
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{
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    int succeeded;
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    Uint16 ramp[3][256];
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    succeeded = SDL_GetGammaRamp(ramp[0], ramp[1], ramp[2]);
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    if (succeeded >= 0) {
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        CalculateGammaFromRamp(red, ramp[0]);
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        CalculateGammaFromRamp(green, ramp[1]);
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        CalculateGammaFromRamp(blue, ramp[2]);
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    }
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    return succeeded;
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}
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int
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SDL_SetGammaRamp(const Uint16 * red, const Uint16 * green,
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                 const Uint16 * blue)
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{
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    SDL_VideoDevice *_this = SDL_GetVideoDevice();
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    int succeeded;
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    /* Lazily allocate the gamma tables */
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    if (!SDL_CurrentDisplay.gamma) {
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        SDL_GetGammaRamp(NULL, NULL, NULL);
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    }
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    /* Fill the gamma table with the new values */
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    if (red) {
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        SDL_memcpy(&SDL_CurrentDisplay.gamma[0 * 256], red,
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                   256 * sizeof(*SDL_CurrentDisplay.gamma));
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    }
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    if (green) {
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        SDL_memcpy(&SDL_CurrentDisplay.gamma[1 * 256], green,
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                   256 * sizeof(*SDL_CurrentDisplay.gamma));
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    }
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    if (blue) {
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        SDL_memcpy(&SDL_CurrentDisplay.gamma[2 * 256], blue,
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                   256 * sizeof(*SDL_CurrentDisplay.gamma));
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    }
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    /* Try to set the gamma ramp in the driver */
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    succeeded = -1;
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    if (_this && _this->SetDisplayGammaRamp) {
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        if (SDL_GetFocusWindow()) {
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            succeeded =
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                _this->SetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma);
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        } else {
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            succeeded = 0;
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        }
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    } else {
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        SDL_SetError("Gamma ramp manipulation not supported");
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    }
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    return succeeded;
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}
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int
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SDL_GetGammaRamp(Uint16 * red, Uint16 * green, Uint16 * blue)
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{
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    SDL_VideoDevice *_this = SDL_GetVideoDevice();
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    /* Lazily allocate the gamma table */
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    if (!SDL_CurrentDisplay.gamma) {
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        size_t rampsize = (3 * 256 * sizeof(*SDL_CurrentDisplay.gamma));
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        SDL_CurrentDisplay.gamma = SDL_malloc(rampsize * 2);
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        if (!SDL_CurrentDisplay.gamma) {
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            SDL_OutOfMemory();
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            return -1;
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        }
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        if (_this && _this->GetDisplayGammaRamp) {
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            /* Get the real hardware gamma */
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            _this->GetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma);
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        } else {
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            /* Assume an identity gamma */
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            int i;
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            for (i = 0; i < 256; ++i) {
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                SDL_CurrentDisplay.gamma[0 * 256 + i] = (i << 8) | i;
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                SDL_CurrentDisplay.gamma[1 * 256 + i] = (i << 8) | i;
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                SDL_CurrentDisplay.gamma[2 * 256 + i] = (i << 8) | i;
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            }
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        }
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        SDL_CurrentDisplay.saved_gamma = SDL_CurrentDisplay.gamma + (3 * 256);
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        SDL_memcpy(SDL_CurrentDisplay.saved_gamma, SDL_CurrentDisplay.gamma,
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                   rampsize);
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    }
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    /* Just copy from our internal table */
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    if (red) {
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        SDL_memcpy(red, &SDL_CurrentDisplay.gamma[0 * 256],
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                   256 * sizeof(*red));
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   193
    }
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    if (green) {
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        SDL_memcpy(green, &SDL_CurrentDisplay.gamma[1 * 256],
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                   256 * sizeof(*green));
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   197
    }
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    if (blue) {
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        SDL_memcpy(blue, &SDL_CurrentDisplay.gamma[2 * 256],
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                   256 * sizeof(*blue));
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   201
    }
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   202
    return 0;
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}
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/* vi: set ts=4 sw=4 expandtab: */