mirror of
https://github.com/koreader/koreader
synced 2024-10-31 21:20:20 +00:00
365 lines
8.5 KiB
C
365 lines
8.5 KiB
C
/*
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KindlePDFViewer: buffer for blitting muPDF data to framebuffer (blitbuffer)
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Copyright (C) 2011 Hans-Werner Hilse <hilse@web.de>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "blitbuffer.h"
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int newBlitBufferNative(lua_State *L, int w, int h, BlitBuffer **newBuffer) {
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BlitBuffer *bb = (BlitBuffer*) lua_newuserdata(L, sizeof(BlitBuffer));
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luaL_getmetatable(L, "blitbuffer");
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lua_setmetatable(L, -2);
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bb->w = w;
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bb->pitch = (w + 1) / 2;
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bb->h = h;
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bb->data = malloc(bb->pitch * h);
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if(bb->data == NULL) {
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return luaL_error(L, "cannot allocate memory for blitbuffer");
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}
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memset(bb->data, 0, bb->pitch * h);
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bb->allocated = 1;
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if(newBuffer != NULL) {
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*newBuffer = bb;
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}
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return 1;
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}
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static int newBlitBuffer(lua_State *L) {
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int w = luaL_checkint(L, 1);
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int h = luaL_checkint(L, 2);
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return newBlitBufferNative(L, w, h, NULL);
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}
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static int getWidth(lua_State *L) {
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BlitBuffer *bb = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
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lua_pushinteger(L, bb->w);
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return 1;
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}
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static int getHeight(lua_State *L) {
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BlitBuffer *bb = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
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lua_pushinteger(L, bb->h);
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return 1;
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}
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static int freeBlitBuffer(lua_State *L) {
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BlitBuffer *bb = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
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if(bb->allocated && bb->data != NULL) {
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free(bb->data);
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bb->data = NULL;
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}
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return 0;
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}
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static int blitFullToBuffer(lua_State *L) {
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BlitBuffer *dst = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
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BlitBuffer *src = (BlitBuffer*) luaL_checkudata(L, 2, "blitbuffer");
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if(src->w != dst->w || src->h != dst->h) {
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return luaL_error(L, "blitbuffer size must be framebuffer size!");
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}
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memcpy(dst->data, src->data, src->pitch * src->h);
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return 0;
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}
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static int blitToBuffer(lua_State *L) {
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BlitBuffer *dst = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
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BlitBuffer *src = (BlitBuffer*) luaL_checkudata(L, 2, "blitbuffer");
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int xdest = luaL_checkint(L, 3);
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int ydest = luaL_checkint(L, 4);
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int xoffs = luaL_checkint(L, 5);
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int yoffs = luaL_checkint(L, 6);
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int w = luaL_checkint(L, 7);
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int h = luaL_checkint(L, 8);
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int x, y;
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// check bounds
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if(yoffs >= src->h) {
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return 0;
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} else if(yoffs + h > src->h) {
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h = src->h - yoffs;
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}
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if(ydest >= dst->h) {
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return 0;
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} else if(ydest + h > dst->h) {
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h = dst->h - ydest;
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}
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if(xoffs >= src->w) {
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return 0;
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} else if(xoffs + w > src->w) {
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w = src->w - xoffs;
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}
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if(xdest >= dst->w) {
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return 0;
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} else if(xdest + w > dst->w) {
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w = dst->w - xdest;
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}
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uint8_t *dstptr;
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uint8_t *srcptr;
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if(xdest & 1) {
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/* this will render the leftmost column */
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dstptr = (uint8_t*)(dst->data +
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ydest * dst->pitch +
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xdest / 2);
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srcptr = (uint8_t*)(src->data +
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yoffs * src->pitch +
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xoffs / 2 );
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if(xoffs & 1) {
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for(y = 0; y < h; y++) {
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*dstptr &= 0xF0;
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*dstptr |= *srcptr & 0x0F;
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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} else {
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for(y = 0; y < h; y++) {
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*dstptr &= 0xF0;
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*dstptr |= *srcptr >> 4;
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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}
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xdest++;
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xoffs++;
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w--;
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}
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dstptr = (uint8_t*)(dst->data +
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ydest * dst->pitch +
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xdest / 2);
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srcptr = (uint8_t*)(src->data +
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yoffs * src->pitch +
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xoffs / 2 );
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if(xoffs & 1) {
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for(y = 0; y < h; y++) {
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for(x = 0; x < (w / 2); x++) {
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dstptr[x] = (srcptr[x] << 4) | (srcptr[x+1] >> 4);
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}
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if(w & 1) {
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dstptr[x] &= 0x0F;
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dstptr[x] |= srcptr[x] << 4;
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}
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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} else {
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for(y = 0; y < h; y++) {
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memcpy(dstptr, srcptr, w / 2);
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if(w & 1) {
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dstptr[w/2] &= 0x0F;
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dstptr[w/2] |= (srcptr[w/2] & 0xF0);
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}
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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}
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return 0;
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}
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static int addblitToBuffer(lua_State *L) {
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BlitBuffer *dst = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
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BlitBuffer *src = (BlitBuffer*) luaL_checkudata(L, 2, "blitbuffer");
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int xdest = luaL_checkint(L, 3);
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int ydest = luaL_checkint(L, 4);
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int xoffs = luaL_checkint(L, 5);
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int yoffs = luaL_checkint(L, 6);
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int w = luaL_checkint(L, 7);
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int h = luaL_checkint(L, 8);
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int x, y;
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// check bounds
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if(yoffs >= src->h) {
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return 0;
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} else if(yoffs + h > src->h) {
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h = src->h - yoffs;
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}
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if(ydest >= dst->h) {
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return 0;
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} else if(ydest + h > dst->h) {
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h = dst->h - ydest;
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}
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if(xoffs >= src->w) {
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return 0;
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} else if(xoffs + w > src->w) {
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w = src->w - xoffs;
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}
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if(xdest >= dst->w) {
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return 0;
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} else if(xdest + w > dst->w) {
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w = dst->w - xdest;
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}
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uint8_t *dstptr;
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uint8_t *srcptr;
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if(xdest & 1) {
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/* this will render the leftmost column */
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dstptr = (uint8_t*)(dst->data +
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ydest * dst->pitch +
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xdest / 2);
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srcptr = (uint8_t*)(src->data +
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yoffs * src->pitch +
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xoffs / 2 );
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if(xoffs & 1) {
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for(y = 0; y < h; y++) {
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uint8_t v = (*dstptr & 0x0F) + (*srcptr & 0x0F);
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*dstptr = (*dstptr & 0xF0) | (v < 0x0F ? v : 0x0F);
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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} else {
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for(y = 0; y < h; y++) {
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uint8_t v = (*dstptr & 0x0F) + (*srcptr >> 4);
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*dstptr = (*dstptr & 0xF0) | (v < 0x0F ? v : 0x0F);
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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}
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xdest++;
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xoffs++;
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w--;
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}
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dstptr = (uint8_t*)(dst->data +
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ydest * dst->pitch +
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xdest / 2);
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srcptr = (uint8_t*)(src->data +
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yoffs * src->pitch +
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xoffs / 2 );
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if(xoffs & 1) {
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for(y = 0; y < h; y++) {
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for(x = 0; x < (w / 2); x++) {
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uint16_t v1 = (dstptr[x] & 0xF0) + ((srcptr[x] & 0x0F) << 4);
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uint8_t v2 = (dstptr[x] & 0x0F) + (srcptr[x+1] >> 4);
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dstptr[x] = (v1 < 0xF0 ? v1 : 0xF0) | (v2 < 0x0F ? v2 : 0x0F);
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}
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if(w & 1) {
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uint16_t v1 = (dstptr[x] & 0xF0) + ((srcptr[x] & 0x0F) << 4);
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dstptr[x] = (dstptr[x] & 0x0F) | (v1 < 0xF0 ? v1 : 0xF0);
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}
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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} else {
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for(y = 0; y < h; y++) {
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for(x = 0; x < (w / 2); x++) {
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uint16_t v1 = (dstptr[x] & 0xF0) + (srcptr[x] & 0xF0);
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uint8_t v2 = (dstptr[x] & 0x0F) + (srcptr[x] & 0x0F);
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dstptr[x] = (v1 < 0xF0 ? v1 : 0xF0) | (v2 < 0x0F ? v2 : 0x0F);
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}
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if(w & 1) {
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uint16_t v1 = (dstptr[x] & 0xF0) + (srcptr[x] & 0xF0);
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dstptr[x] = (dstptr[x] & 0x0F) | (v1 < 0xF0 ? v1 : 0xF0);
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}
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dstptr += dst->pitch;
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srcptr += src->pitch;
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}
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}
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return 0;
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}
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static int paintRect(lua_State *L) {
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BlitBuffer *dst = (BlitBuffer*) luaL_checkudata(L, 1, "blitbuffer");
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int x = luaL_checkint(L, 2);
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int y = luaL_checkint(L, 3);
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int w = luaL_checkint(L, 4);
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int h = luaL_checkint(L, 5);
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int c = luaL_checkint(L, 6);
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uint8_t *dstptr;
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int cy;
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if(w <= 0 || h <= 0 || x >= dst->w || y >= dst->h) {
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return 0;
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}
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if(x + w > dst->w) {
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w = dst->w - x;
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}
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if(y + h > dst->h) {
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h = dst->h - y;
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}
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if(x & 1) {
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/* this will render the leftmost column */
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dstptr = (uint8_t*)(dst->data +
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y * dst->pitch +
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x / 2);
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for(cy = 0; cy < h; cy++) {
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*dstptr &= 0xF0;
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*dstptr |= c;
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dstptr += dst->pitch;
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}
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x++;
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w--;
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}
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dstptr = (uint8_t*)(dst->data +
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y * dst->pitch +
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x / 2);
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for(cy = 0; cy < h; cy++) {
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memset(dstptr, c | (c << 4), w / 2);
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dstptr += dst->pitch;
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}
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if(w & 1) {
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dstptr = (uint8_t*)(dst->data +
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y * dst->pitch +
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(x + w + 1) / 2);
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for(cy = 0; cy < h; cy++) {
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*dstptr &= 0x0F;
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*dstptr |= (c << 4);
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dstptr += dst->pitch;
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}
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}
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return 0;
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}
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static const struct luaL_reg blitbuffer_func[] = {
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{"new", newBlitBuffer},
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{NULL, NULL}
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};
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static const struct luaL_reg blitbuffer_meth[] = {
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{"getWidth", getWidth},
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{"getHeight", getHeight},
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{"blitFrom", blitToBuffer},
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{"addblitFrom", addblitToBuffer},
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{"blitFullFrom", blitFullToBuffer},
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{"paintRect", paintRect},
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{"free", freeBlitBuffer},
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{"__gc", freeBlitBuffer},
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{NULL, NULL}
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};
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int luaopen_blitbuffer(lua_State *L) {
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luaL_newmetatable(L, "blitbuffer");
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lua_pushstring(L, "__index");
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lua_pushvalue(L, -2);
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lua_settable(L, -3);
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luaL_register(L, NULL, blitbuffer_meth);
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lua_setglobal(L, "blitbuffer");
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luaL_register(L, "Blitbuffer", blitbuffer_func);
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return 1;
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}
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