158 lines
4.6 KiB
C
158 lines
4.6 KiB
C
/* ****************************************************************************
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* link/usage/getscreen.c -- getting the screen.
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* Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libcasio.
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* libcasio is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libcasio 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.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libcasio; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************* */
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#include "usage.h"
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#define failure(CASIO__ERR) { err = casio_error_ ## CASIO__ERR; goto fail; }
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#define WIDTH CASIO_SEVEN_MAX_VRAM_WIDTH
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#define HEIGHT CASIO_SEVEN_MAX_VRAM_HEIGHT
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/* ---
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* Screen management.
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* --- */
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int CASIO_EXPORT casio_make_screen(casio_screen_t **screenp,
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unsigned int width, unsigned int height)
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{
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casio_screen_t *screen;
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casio_pixel_t **pixels, *base;
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int y;
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/* Allocate and prepare the screen. */
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screen = casio_alloc(sizeof(casio_screen_t)
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+ sizeof(casio_pixel_t*) * width
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+ sizeof(casio_pixel_t) * width * height, 1);
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if (!screen)
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return (casio_error_alloc);
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screen->casio_screen_width = width;
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screen->casio_screen_realwidth = width;
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screen->casio_screen_height = height;
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screen->casio_screen_realheight = height;
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screen->casio_screen_pixels = (casio_pixel_t **)&screen[1];
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/* Prepare the pixels. */
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pixels = screen->casio_screen_pixels;
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base = (casio_pixel_t*)(&pixels[height]);
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for (y = height - 1; y >= 0; y--)
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pixels[y] = base + y * width;
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*screenp = screen;
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return (0);
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}
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int CASIO_EXPORT casio_free_screen(casio_screen_t *screen)
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{
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casio_free(screen);
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return (0);
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}
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/* ---
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* Gather the screen on a legacy fx device, or using legacy fx-CG formats.
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* This also gathers a screen from the Prizm with protocol 7.00 compatibility.
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* --- */
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/* Legacy screenstreaming uses tweaks in Protocol 7.00 (managed in the
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* libcasio Protocol 7.00 link core code) to transmit a continuous feed
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* of images, not expecting the other party to answer (so we're not answering).
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*
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* In fact, not continuous: the calculator only sends a frame when it feels
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* like it, usually when the screen changes. Also, as the calculator doesn't
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* wait for us to send screens (it starts sending screens as soon as it is
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* on), it might be in the middle of sending a screen when we're joining in.
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* Fortunately, there is a "screen alignment" function in the packet receiving
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* function that we can use, that looks for the packet beginning. It may fail
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* sometimes, and get a weird screen, but it does its best. */
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/**
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* casio_get_seven_screen:
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* Get the screen through protocol 7.00.
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*/
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CASIO_LOCAL int casio_get_seven_screen(casio_link_t *handle,
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casio_screen_t **screenp)
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{
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int err = 0;
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casio_screen_t *screen;
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/* Make checks. */
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chk_passive(handle);
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/* Prepare the screen. */
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screen = *screenp;
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if (!(screen && screen->casio_screen_realwidth == WIDTH
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&& screen->casio_screen_realheight)) {
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/* Allocate the thing first, so that if we fail, the screen is
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* still there to be used by the user, in case. */
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if ((err = casio_make_screen(&screen, WIDTH, HEIGHT)))
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return (err);
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if (*screenp)
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casio_free_screen(*screenp);
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*screenp = screen;
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}
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/* Get the screen packet. */
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if ((err = casio_seven_receive(handle, CASIO_SEVEN_RECEIVEFLAG_SCRALIGN)))
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return (err);
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if (response.casio_seven_packet_type != casio_seven_type_ohp)
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return (casio_error_unknown);
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/* Convert the screen buffer and return. */
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screen->casio_screen_width = response.casio_seven_packet_width;
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screen->casio_screen_height = response.casio_seven_packet_height;
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casio_decode_picture(screen->casio_screen_pixels,
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response.casio_seven_packet_vram,
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response.casio_seven_packet_pictype,
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screen->casio_screen_width,
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screen->casio_screen_height);
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return (0);
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}
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/* ---
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* Public function.
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* --- */
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/**
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* casio_get_screen:
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* Get the screen.
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*
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* @arg handle the link handle.
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* @arg screen the screen to allocate/reallocate/reuse.
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* @return if it worked.
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*/
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int CASIO_EXPORT casio_get_screen(casio_link_t *handle,
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casio_screen_t **screenp)
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{
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int err = 0;
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casio_screen_t *screen;
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chk_handle(handle);
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chk_seven(handle); /* TODO: SCSI? */
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return (casio_get_seven_screen(handle, screenp));
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}
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