From 65dd76a221e23a7200b33645326e90c0c02be7ed Mon Sep 17 00:00:00 2001 From: Jon Lund Steffensen Date: Mon, 24 May 2010 23:37:36 +0200 Subject: Use the prefix 'gamma' for gamma adjustment source files. --- src/gamma-w32gdi.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 src/gamma-w32gdi.c (limited to 'src/gamma-w32gdi.c') diff --git a/src/gamma-w32gdi.c b/src/gamma-w32gdi.c new file mode 100644 index 0000000..d1b6533 --- /dev/null +++ b/src/gamma-w32gdi.c @@ -0,0 +1,127 @@ +/* gamma-w32gdi.c -- Windows GDI gamma adjustment source + This file is part of Redshift. + + Redshift is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Redshift 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Redshift. If not, see . + + Copyright (c) 2010 Jon Lund Steffensen +*/ + +#include +#include + +#define WINVER 0x0500 +#include +#include + +#ifdef ENABLE_NLS +# include +# define _(s) gettext(s) +#else +# define _(s) s +#endif + +#include "w32gdi.h" +#include "colorramp.h" + +#define GAMMA_RAMP_SIZE 256 + + +int +w32gdi_init(w32gdi_state_t *state, char *args) +{ + BOOL r; + + /* Open device context */ + state->hDC = GetDC(NULL); + if (state->hDC == NULL) { + fputs(_("Unable to open device context.\n"), stderr); + return -1; + } + + /* Check support for gamma ramps */ + int cmcap = GetDeviceCaps(state->hDC, COLORMGMTCAPS); + if (cmcap != CM_GAMMA_RAMP) { + fputs(_("Display device does not support gamma ramps.\n"), + stderr); + return -1; + } + + /* Allocate space for saved gamma ramps */ + state->saved_ramps = malloc(3*GAMMA_RAMP_SIZE*sizeof(WORD)); + if (state->saved_ramps == NULL) { + perror("malloc"); + ReleaseDC(NULL, state->hDC); + return -1; + } + + /* Save current gamma ramps so we can restore them at program exit */ + r = GetDeviceGammaRamp(state->hDC, state->saved_ramps); + if (!r) { + fputs(_("Unable to save current gamma ramp.\n"), stderr); + ReleaseDC(NULL, state->hDC); + return -1; + } + + return 0; +} + +void +w32gdi_free(w32gdi_state_t *state) +{ + /* Free saved ramps */ + free(state->saved_ramps); + + /* Release device context */ + ReleaseDC(NULL, state->hDC); +} + +void +w32gdi_restore(w32gdi_state_t *state) +{ + /* Restore gamma ramps */ + BOOL r = SetDeviceGammaRamp(state->hDC, state->saved_ramps); + if (!r) fputs(_("Unable to restore gamma ramps.\n"), stderr); +} + +int +w32gdi_set_temperature(w32gdi_state_t *state, int temp, float gamma[3]) +{ + BOOL r; + + /* Create new gamma ramps */ + WORD *gamma_ramps = malloc(3*GAMMA_RAMP_SIZE*sizeof(WORD)); + if (gamma_ramps == NULL) { + perror("malloc"); + return -1; + } + + WORD *gamma_r = &gamma_ramps[0*GAMMA_RAMP_SIZE]; + WORD *gamma_g = &gamma_ramps[1*GAMMA_RAMP_SIZE]; + WORD *gamma_b = &gamma_ramps[2*GAMMA_RAMP_SIZE]; + + colorramp_fill(gamma_r, gamma_g, gamma_b, GAMMA_RAMP_SIZE, + temp, gamma); + + /* Set new gamma ramps */ + r = SetDeviceGammaRamp(state->hDC, gamma_ramps); + if (!r) { + fputs(_("Unable to set gamma ramps.\n"), stderr); + free(gamma_ramps); + return -1; + } + + free(gamma_ramps); + + return 0; +} -- cgit v1.2.3-70-g09d2