Mercurial > sdl-ios-xcode
view src/video/SDL_gamma.c @ 2825:620a91b6d263
Date: Tue, 02 Dec 2008 23:38:26 +0100
From: Couriersud
Subject: Re: SDL: Keyboard layout unknown
I have attached a diff which will add an additional keyboard layout to
the x11 driver. The issue arose, when I moved to ubuntu intrepid. I was
only able to map the keys available on my keyboard. The differences to
the existing keyboard was the mapping of HOME,UP,DOWN and some other
keys.
Now only one issue remains. Dead keys (e.g. ^, ` ') on european
keyboards do not generate a "scancode" event. Just a text event when the
key is composed (e.g. ?? ?? ??).
author | Sam Lantinga <slouken@libsdl.org> |
---|---|
date | Wed, 03 Dec 2008 04:32:24 +0000 |
parents | a98604b691c8 |
children | 99210400e8b9 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga 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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" /* Gamma correction support */ #include "../libm/math.h" #include "SDL_sysvideo.h" static void CalculateGammaRamp(float gamma, Uint16 * ramp) { int i; /* 0.0 gamma is all black */ if (gamma <= 0.0f) { for (i = 0; i < 256; ++i) { ramp[i] = 0; } return; } else /* 1.0 gamma is identity */ if (gamma == 1.0f) { for (i = 0; i < 256; ++i) { ramp[i] = (i << 8) | i; } return; } else /* Calculate a real gamma ramp */ { int value; gamma = 1.0f / gamma; for (i = 0; i < 256; ++i) { value = (int) (pow((double) i / 256.0, gamma) * 65535.0 + 0.5); if (value > 65535) { value = 65535; } ramp[i] = (Uint16) value; } } } static void CalculateGammaFromRamp(float *gamma, Uint16 * ramp) { /* The following is adapted from a post by Garrett Bass on OpenGL Gamedev list, March 4, 2000. */ float sum = 0.0f; int i, count = 0; *gamma = 1.0; for (i = 1; i < 256; ++i) { if ((ramp[i] != 0) && (ramp[i] != 65535)) { double B = (double) i / 256.0; double A = ramp[i] / 65535.0; sum += (float) (log(A) / log(B)); count++; } } if (count && sum > 0.0f) { *gamma = 1.0f / (sum / count); } } int SDL_SetGamma(float red, float green, float blue) { Uint16 ramp[3][256]; CalculateGammaRamp(red, ramp[0]); CalculateGammaRamp(green, ramp[1]); CalculateGammaRamp(blue, ramp[2]); return SDL_SetGammaRamp(ramp[0], ramp[1], ramp[2]); } /* Calculating the gamma by integrating the gamma ramps isn't exact, so this function isn't officially supported. */ int SDL_GetGamma(float *red, float *green, float *blue) { int succeeded; Uint16 ramp[3][256]; succeeded = SDL_GetGammaRamp(ramp[0], ramp[1], ramp[2]); if (succeeded >= 0) { CalculateGammaFromRamp(red, ramp[0]); CalculateGammaFromRamp(green, ramp[1]); CalculateGammaFromRamp(blue, ramp[2]); } return succeeded; } int SDL_SetGammaRamp(const Uint16 * red, const Uint16 * green, const Uint16 * blue) { SDL_VideoDevice *_this = SDL_GetVideoDevice(); int succeeded; /* Lazily allocate the gamma tables */ if (!SDL_CurrentDisplay.gamma) { SDL_GetGammaRamp(NULL, NULL, NULL); } /* Fill the gamma table with the new values */ if (red) { SDL_memcpy(&SDL_CurrentDisplay.gamma[0 * 256], red, 256 * sizeof(*SDL_CurrentDisplay.gamma)); } if (green) { SDL_memcpy(&SDL_CurrentDisplay.gamma[1 * 256], green, 256 * sizeof(*SDL_CurrentDisplay.gamma)); } if (blue) { SDL_memcpy(&SDL_CurrentDisplay.gamma[2 * 256], blue, 256 * sizeof(*SDL_CurrentDisplay.gamma)); } /* Try to set the gamma ramp in the driver */ succeeded = -1; if (_this && _this->SetDisplayGammaRamp) { if (SDL_GetFocusWindow()) { succeeded = _this->SetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma); } else { succeeded = 0; } } else { SDL_SetError("Gamma ramp manipulation not supported"); } return succeeded; } int SDL_GetGammaRamp(Uint16 * red, Uint16 * green, Uint16 * blue) { SDL_VideoDevice *_this = SDL_GetVideoDevice(); /* Lazily allocate the gamma table */ if (!SDL_CurrentDisplay.gamma) { size_t rampsize = (3 * 256 * sizeof(*SDL_CurrentDisplay.gamma)); SDL_CurrentDisplay.gamma = SDL_malloc(rampsize * 2); if (!SDL_CurrentDisplay.gamma) { SDL_OutOfMemory(); return -1; } if (_this && _this->GetDisplayGammaRamp) { /* Get the real hardware gamma */ _this->GetDisplayGammaRamp(_this, SDL_CurrentDisplay.gamma); } else { /* Assume an identity gamma */ int i; for (i = 0; i < 256; ++i) { SDL_CurrentDisplay.gamma[0 * 256 + i] = (i << 8) | i; SDL_CurrentDisplay.gamma[1 * 256 + i] = (i << 8) | i; SDL_CurrentDisplay.gamma[2 * 256 + i] = (i << 8) | i; } } SDL_CurrentDisplay.saved_gamma = SDL_CurrentDisplay.gamma + (3 * 256); SDL_memcpy(SDL_CurrentDisplay.saved_gamma, SDL_CurrentDisplay.gamma, rampsize); } /* Just copy from our internal table */ if (red) { SDL_memcpy(red, &SDL_CurrentDisplay.gamma[0 * 256], 256 * sizeof(*red)); } if (green) { SDL_memcpy(green, &SDL_CurrentDisplay.gamma[1 * 256], 256 * sizeof(*green)); } if (blue) { SDL_memcpy(blue, &SDL_CurrentDisplay.gamma[2 * 256], 256 * sizeof(*blue)); } return 0; } /* vi: set ts=4 sw=4 expandtab: */