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/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "cards.h"
static SDL_Surface *
dibSurface(SDL_RWops *rw, Uint32 offset, Uint32 length) {
Uint32 bitmapLength = 0x0E + length;
Uint8 *buffer = malloc(bitmapLength);
if (!buffer) {
SDL_SetError("malloc error: %s", strerror(errno));
return NULL;
}
SDL_RWops *bitmap = SDL_RWFromMem(buffer, bitmapLength);
if (!bitmap) {
free(buffer);
return NULL;
}
if (SDL_RWseek(rw, offset, RW_SEEK_SET) < 0) goto fail;
Uint32 dibHeaderLength = SDL_ReadLE32(rw);
Uint32 bitmapDataOffset = 0x0E + dibHeaderLength;
if (dibHeaderLength == 0x0C) {
if (SDL_RWseek(rw, 0x06, RW_SEEK_CUR) < 0) goto fail;
Uint16 bitsPerPixel = SDL_ReadLE16(rw);
bitmapDataOffset += 3 * (1 << bitsPerPixel);
} else if (dibHeaderLength == 0x28) {
if (SDL_RWseek(rw, 0x0A, RW_SEEK_CUR) < 0) goto fail;
Uint16 bitsPerPixel = SDL_ReadLE16(rw);
if (SDL_RWseek(rw, 0x10, RW_SEEK_CUR) < 0) goto fail;
Uint32 paletteLength = SDL_ReadLE32(rw);
if (!paletteLength) paletteLength = 1 << bitsPerPixel;
bitmapDataOffset += 4 * paletteLength;
} else {
SDL_SetError("unrecognized DIB header length %u", dibHeaderLength);
goto fail;
}
SDL_WriteU8(bitmap, 'B');
SDL_WriteU8(bitmap, 'M');
SDL_WriteLE32(bitmap, bitmapLength);
SDL_WriteLE16(bitmap, 0); // reserved
SDL_WriteLE16(bitmap, 0); // reserved
SDL_WriteLE32(bitmap, bitmapDataOffset);
if (SDL_RWseek(rw, offset, RW_SEEK_SET) < 0) goto fail;
if (SDL_RWread(rw, &buffer[SDL_RWtell(bitmap)], length, 1) < 1) goto fail;
SDL_RWseek(bitmap, 0, RW_SEEK_SET);
SDL_Surface *surface = SDL_LoadBMP_RW(bitmap, 1);
free(buffer);
return surface;
fail:
SDL_RWclose(bitmap);
free(buffer);
return NULL;
}
static int setColorKey(struct Cards *cards) {
int i = Cards_Empty;
if (SDL_SetColorKey(cards->surfaces[i], SDL_TRUE, 1) < 0) return -1;
for (i = Cards_X; i <= Cards_O; ++i) {
if (SDL_SetColorKey(cards->surfaces[i], SDL_TRUE, 12) < 0) return -1;
}
return 0;
}
static int setAlphaCorners(struct Cards *cards) {
SDL_Surface *alpha = NULL;
for (int i = 0; i < Cards_Count; ++i) {
if (!cards->surfaces[i]) continue;
alpha = SDL_ConvertSurfaceFormat(
cards->surfaces[i], SDL_PIXELFORMAT_RGBA32, 0
);
if (!alpha) return -1;
if (SDL_SetSurfaceBlendMode(alpha, SDL_BLENDMODE_BLEND) < 0) goto fail;
SDL_Rect rects[8] = {
{ 0, 0, 2, 1 },
{ 0, 1, 1, 1 },
{ Cards_Width - 2, 0, 2, 1 },
{ Cards_Width - 1, 1, 1, 1 },
{ 0, Cards_Height - 1, 2, 1 },
{ 0, Cards_Height - 2, 1, 1 },
{ Cards_Width - 2, Cards_Height - 1, 2, 1 },
{ Cards_Width - 1, Cards_Height - 2, 1, 1 },
};
Uint32 trans = SDL_MapRGBA(alpha->format, 0x00, 0x00, 0x00, 0x00);
if (SDL_FillRects(alpha, rects, 8, trans) < 0) goto fail;
SDL_FreeSurface(cards->surfaces[i]);
cards->surfaces[i] = alpha;
}
return 0;
fail:
SDL_FreeSurface(alpha);
return -1;
}
static int setBlackBorders(struct Cards *cards) {
for (int i = Cards_Diamond + Cards_A; i <= Cards_Heart + Cards_K; ++i) {
if (!cards->surfaces[i]) continue;
SDL_Rect rects[8] = {
{ 2, 0, Cards_Width - 4, 1 },
{ 2, Cards_Height - 1, Cards_Width - 4, 1 },
{ 0, 2, 1, Cards_Height - 4 },
{ Cards_Width - 1, 2, 1, Cards_Height - 4 },
{ 1, 1, 1, 1 },
{ Cards_Width - 2, 1, 1, 1 },
{ 1, Cards_Height - 2, 1, 1 },
{ Cards_Width - 2, Cards_Height - 2, 1, 1 },
};
Uint32 black = SDL_MapRGB(cards->surfaces[i]->format, 0x00, 0x00, 0x00);
if (SDL_FillRects(cards->surfaces[i], rects, 8, black) < 0) return -1;
}
return 0;
}
struct Cards *Cards_Load(SDL_RWops *rw, enum Cards_Flags flags) {
struct Cards *cards = calloc(1, sizeof(*cards));
if (!cards) {
SDL_SetError("calloc error: %s", strerror(errno));
return NULL;
}
if (SDL_RWseek(rw, 0, RW_SEEK_SET) < 0) goto fail;
if (SDL_ReadU8(rw) != 'M' || SDL_ReadU8(rw) != 'Z') {
SDL_SetError("invalid MZ signature");
goto fail;
}
if (SDL_RWseek(rw, 0x3C, RW_SEEK_SET) < 0) goto fail;
Uint16 neOffset = SDL_ReadLE16(rw);
if (SDL_RWseek(rw, neOffset, RW_SEEK_SET) < 0) goto fail;
if (SDL_ReadU8(rw) != 'N' || SDL_ReadU8(rw) != 'E') {
SDL_SetError("invalid NE signature");
goto fail;
}
if (SDL_RWseek(rw, neOffset + 0x24, RW_SEEK_SET) < 0) goto fail;
Uint16 resourceTableOffset = neOffset + SDL_ReadLE16(rw);
if (SDL_RWseek(rw, resourceTableOffset, RW_SEEK_SET) < 0) goto fail;
Uint16 alignmentShift = SDL_ReadLE16(rw);
Uint16 resourceCount;
for (;;) {
Uint16 typeID = SDL_ReadLE16(rw);
resourceCount = SDL_ReadLE16(rw);
SDL_ReadLE32(rw); // reserved
if (!typeID) {
SDL_SetError("no bitmap resources");
goto fail;
}
if (typeID == 0x8002) break;
if (SDL_RWseek(rw, 0x0C * resourceCount, RW_SEEK_CUR) < 0) goto fail;
}
for (Uint16 i = 0; i < resourceCount; ++i) {
Uint16 offset = SDL_ReadLE16(rw);
Uint16 length = SDL_ReadLE16(rw);
SDL_ReadLE16(rw); // flags
Uint16 id = SDL_ReadLE16(rw);
SDL_ReadLE32(rw); // reserved
id &= 0x7FFF;
if (id >= Cards_Count) continue;
Sint64 next = SDL_RWtell(rw);
if (next < 0) goto fail;
cards->surfaces[id] = dibSurface(
rw,
(Uint32)offset << alignmentShift,
(Uint32)length << alignmentShift
);
if (!cards->surfaces[id]) goto fail;
if (SDL_RWseek(rw, next, RW_SEEK_SET) < 0) goto fail;
}
for (int i = Cards_Club + Cards_A; i <= Cards_Spade + Cards_K; ++i) {
if (cards->surfaces[i]) continue;
SDL_SetError("missing resource %d", i);
goto fail;
}
for (int i = Cards_Empty; i <= Cards_Back12; ++i) {
if (cards->surfaces[i]) continue;
SDL_SetError("missing resource %d", i);
goto fail;
}
for (int i = Cards_X; i <= Cards_O; ++i) {
if (cards->surfaces[i]) continue;
SDL_SetError("missing resource %d", i);
goto fail;
}
if (flags & Cards_ColorKey) {
if (setColorKey(cards) < 0) goto fail;
}
if (flags & Cards_AlphaCorners) {
if (setAlphaCorners(cards) < 0) goto fail;
}
if (flags & Cards_BlackBorders) {
if (setBlackBorders(cards) < 0) goto fail;
}
return cards;
fail:
Cards_Free(cards);
return NULL;
}
void Cards_Free(struct Cards *cards) {
for (int i = 0; i < Cards_Count; ++i) {
if (!cards->surfaces[i]) continue;
SDL_FreeSurface(cards->surfaces[i]);
}
free(cards);
}
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