376 lines
10 KiB
C
376 lines
10 KiB
C
/*
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* Frame buffer low level functions for QEmacs
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*
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* Copyright (c) 2001, 2002 Fabrice Bellard.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qe.h"
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#include "cfb.h"
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#include "fbfrender.h"
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static unsigned int cfb15_get_color(unsigned int color)
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{
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unsigned int r, g, b;
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r = (color >> 16) & 0xff;
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g = (color >> 8) & 0xff;
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b = (color) & 0xff;
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return ((((r) >> 3) << 10) | (((g) >> 3) << 5) | ((b) >> 3));
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}
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static unsigned int cfb16_get_color(unsigned int color)
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{
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unsigned int r, g, b;
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r = (color >> 16) & 0xff;
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g = (color >> 8) & 0xff;
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b = (color) & 0xff;
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return ((((r) >> 3) << 11) | (((g) >> 2) << 5) | ((b) >> 3));
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}
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static unsigned int cfb24_get_color(unsigned int color)
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{
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return color & 0xffffff;
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}
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static void cfb16_fill_rectangle(QEditScreen *s,
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int x1, int y1, int w, int h, QEColor color)
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{
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CFBContext *cfb = s->priv_data;
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unsigned char *dest, *d;
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int y, n;
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unsigned int col;
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col = cfb->get_color(color);
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col = (col << 16) | col;
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dest = cfb->base + y1 * cfb->wrap + x1 * 2;
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for (y = 0; y < h; y++) {
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d = dest;
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n = w;
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if (((intptr_t)d & 3) != 0) {
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((uint16_t *)(void *)d)[0] = col;
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d += 2;
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n--;
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}
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while (n >= 8) {
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((uint32_t *)(void *)d)[0] = col;
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((uint32_t *)(void *)d)[1] = col;
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((uint32_t *)(void *)d)[2] = col;
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((uint32_t *)(void *)d)[3] = col;
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d += 16;
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n -= 8;
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}
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while (n > 0) {
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((uint16_t *)(void *)d)[0] = col;
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d += 2;
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n--;
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}
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dest += cfb->wrap;
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}
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}
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static void cfb16_xor_rectangle(QEditScreen *s,
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int x1, int y1, int w, int h, QEColor color)
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{
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CFBContext *cfb = s->priv_data;
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unsigned char *dest, *d;
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int y, n;
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unsigned int col;
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col = cfb->get_color(color);
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col = (col << 16) | col;
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dest = cfb->base + y1 * cfb->wrap + x1 * 2;
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for (y = 0; y < h; y++) {
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d = dest;
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for (n = w; n != 0; n--) {
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((uint16_t *)(void *)d)[0] ^= 0xffff;
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d += 2;
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}
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dest += cfb->wrap;
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}
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}
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static void cfb32_fill_rectangle(QEditScreen *s,
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int x1, int y1, int w, int h, QEColor color)
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{
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CFBContext *cfb = s->priv_data;
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unsigned char *dest, *d;
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int y, n;
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unsigned int col;
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col = cfb->get_color(color);
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dest = cfb->base + y1 * cfb->wrap + x1 * 4;
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for (y = 0; y < h; y++) {
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d = dest;
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n = w;
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while (n >= 4) {
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((uint32_t *)(void *)d)[0] = col;
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((uint32_t *)(void *)d)[1] = col;
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((uint32_t *)(void *)d)[2] = col;
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((uint32_t *)(void *)d)[3] = col;
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d += 16;
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n -= 4;
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}
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while (n > 0) {
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((uint32_t *)(void *)d)[0] = col;
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d += 4;
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n--;
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}
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dest += cfb->wrap;
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}
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}
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static void cfb32_xor_rectangle(QEditScreen *s,
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int x1, int y1, int w, int h, QEColor color)
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{
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CFBContext *cfb = s->priv_data;
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unsigned char *dest, *d;
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int y, n;
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unsigned int col = 0x00ffffff;
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dest = cfb->base + y1 * cfb->wrap + x1 * 4;
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for (y = 0; y < h; y++) {
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d = dest;
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for (n = w; n != 0; n--) {
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((uint32_t *)(void *)d)[0] ^= col;
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d += 4;
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}
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dest += cfb->wrap;
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}
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}
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static void cfb16_draw_glyph(QEditScreen *s1,
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int x1, int y1, int w, int h, QEColor color,
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unsigned char *glyph, int glyph_wrap)
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{
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CFBContext *cfb = s1->priv_data;
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unsigned char *dest, *d, *s, *src;
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int n;
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unsigned int col;
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col = cfb->get_color(color);
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dest = cfb->base + y1 * cfb->wrap + x1 * 2;
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src = glyph;
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while (h > 0) {
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n = w;
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s = src;
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d = dest;
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while (n >= 4) {
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if (s[0] >= 0x80)
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((uint16_t *)(void *)d)[0] = col;
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if (s[1] >= 0x80)
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((uint16_t *)(void *)d)[1] = col;
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if (s[2] >= 0x80)
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((uint16_t *)(void *)d)[2] = col;
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if (s[3] >= 0x80)
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((uint16_t *)(void *)d)[3] = col;
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s += 4;
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d += 4 * 2;
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n -= 4;
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}
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while (n > 0) {
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if (s[0] >= 0x80)
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((uint16_t *)(void *)d)[0] = col;
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s++;
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d += 2;
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n--;
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}
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h--;
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src += glyph_wrap;
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dest += cfb->wrap;
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}
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}
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static void cfb32_draw_glyph(QEditScreen *s1,
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int x1, int y1, int w, int h, QEColor color,
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unsigned char *glyph, int glyph_wrap)
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{
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CFBContext *cfb = s1->priv_data;
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unsigned char *dest, *d, *s, *src;
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int n;
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unsigned int col;
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col = cfb->get_color(color);
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dest = cfb->base + y1 * cfb->wrap + x1 * 4;
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src = glyph;
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while (h > 0) {
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n = w;
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s = src;
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d = dest;
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while (n >= 4) {
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if (s[0] >= 0x80)
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((uint32_t *)(void *)d)[0] = col;
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if (s[1] >= 0x80)
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((uint32_t *)(void *)d)[1] = col;
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if (s[2] >= 0x80)
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((uint32_t *)(void *)d)[2] = col;
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if (s[3] >= 0x80)
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((uint32_t *)(void *)d)[3] = col;
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s += 4;
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d += 4 * 4;
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n -= 4;
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}
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while (n > 0) {
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if (s[0] >= 0x80)
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((uint32_t *)(void *)d)[0] = col;
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s++;
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d += 4;
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n--;
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}
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h--;
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src += glyph_wrap;
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dest += cfb->wrap;
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}
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}
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static void cfb_draw_text(QEditScreen *s, QEFont *font,
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int x_start, int y, const unsigned int *str, int len,
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QEColor color)
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{
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CFBContext *cfb = s->priv_data;
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GlyphCache *g;
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unsigned char *glyph_ptr;
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int i, x1, y1, x2, y2, wrap, x;
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unsigned int cc;
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x = x_start;
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for (i = 0;i < len; i++) {
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cc = str[i];
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g = decode_cached_glyph(s, font, cc);
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if (!g)
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continue;
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x1 = x + g->x;
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x2 = x1 + g->w;
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y2 = y - g->y;
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y1 = y2 - g->h;
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glyph_ptr = g->data;
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wrap = g->w;
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if (x1 >= s->clip_x1 && y1 >= s->clip_y1 &&
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x2 <= s->clip_x2 && y2 <= s->clip_y2)
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goto draw;
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if (x2 <= s->clip_x1 || y2 <= s->clip_y1 ||
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x1 >= s->clip_x2 || y1 >= s->clip_y2)
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goto nodraw;
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if (x1 < s->clip_x1) {
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glyph_ptr += s->clip_x1 - x1;
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x1 = s->clip_x1;
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}
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if (x2 > s->clip_x2)
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x2 = s->clip_x2;
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if (y1 < s->clip_y1) {
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glyph_ptr += (s->clip_y1 - y1) * wrap;
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y1 = s->clip_y1;
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}
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if (y2 > s->clip_y2)
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y2 = s->clip_y2;
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draw:
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cfb->draw_glyph(s, x1, y1,
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x2 - x1, y2 - y1,
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color, glyph_ptr, wrap);
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nodraw:
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x += g->xincr;
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}
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/* underline synthesis */
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if (font->style & (QE_FONT_STYLE_UNDERLINE | QE_FONT_STYLE_LINE_THROUGH)) {
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int dy, h, w;
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h = (font->descent + 2) / 4;
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if (h < 1)
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h = 1;
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w = x - x_start;
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if (font->style & QE_FONT_STYLE_UNDERLINE) {
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dy = (font->descent + 1) / 3;
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fill_rectangle(s, x_start, y + dy, w, h, color);
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}
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if (font->style & QE_FONT_STYLE_LINE_THROUGH) {
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dy = -(font->ascent / 2 - 1);
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fill_rectangle(s, x_start, y + dy, w, h, color);
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}
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}
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}
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static void cfb_set_clip(qe__unused__ QEditScreen *s,
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qe__unused__ int x, qe__unused__ int y,
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qe__unused__ int w, qe__unused__ int h)
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{
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}
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int cfb_init(QEditScreen *s,
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void *base, int wrap, int depth, const char *font_path)
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{
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CFBContext *cfb = s->priv_data;
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cfb->base = base;
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cfb->wrap = wrap;
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cfb->depth = depth;
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cfb->bpp = (depth + 7) / 8;
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switch (depth) {
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case 15:
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cfb->get_color = cfb15_get_color;
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break;
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case 16:
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cfb->get_color = cfb16_get_color;
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break;
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case 24:
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default:
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cfb->get_color = cfb24_get_color;
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break;
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}
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switch (cfb->bpp) {
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case 2:
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s->dpy.dpy_fill_rectangle = cfb16_fill_rectangle;
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s->dpy.dpy_xor_rectangle = cfb16_xor_rectangle;
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cfb->draw_glyph = cfb16_draw_glyph;
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break;
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default:
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case 4:
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s->dpy.dpy_fill_rectangle = cfb32_fill_rectangle;
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s->dpy.dpy_xor_rectangle = cfb32_xor_rectangle;
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cfb->draw_glyph = cfb32_draw_glyph;
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break;
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}
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s->dpy.dpy_set_clip = cfb_set_clip;
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s->dpy.dpy_draw_text = cfb_draw_text;
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/* fbf font handling init */
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s->dpy.dpy_text_metrics = fbf_text_metrics;
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s->dpy.dpy_open_font = fbf_open_font;
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s->dpy.dpy_close_font = fbf_close_font;
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return fbf_render_init(font_path);
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}
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