79 lines
1.9 KiB
C
Executable File
79 lines
1.9 KiB
C
Executable File
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#include "decode.h"
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void decode_spr(const uint8_t *src, int src_pitch, int w, int h, int depth, uint8_t *dst, int dst_pitch, int dst_x, int dst_y, bool reverse_bitplanes) {
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assert((src_pitch & 7) == 0);
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src_pitch /= 8;
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assert((w & 7) == 0);
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w /= 8;
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dst += dst_y * dst_pitch + dst_x;
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const int bitplane_size = src_pitch * h;
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for (int y = 0; y < h; ++y) {
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for (int x = 0; x < w; ++x) {
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for (int i = 0; i < 8; ++i) {
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int color = 0;
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const int mask = 1 << (7 - i);
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for (int bit = 0; bit < depth; ++bit) {
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if (src[bit * bitplane_size] & mask) {
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color |= 1 << (reverse_bitplanes ? bit : (3 - bit));
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}
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}
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dst[x * 8 + i] = color;
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}
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++src;
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}
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src += src_pitch - w;
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dst += dst_pitch;
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}
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}
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void decode_amiga_blk(const uint8_t *src, uint8_t *dst, int dst_pitch) {
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uint16_t data[4];
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for (int y = 0; y < 16; ++y) {
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for (int p = 0; p < 4; ++p) {
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data[p] = READ_BE_UINT16(src); src += 2;
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}
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for (int b = 0; b < 16; ++b) {
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const int mask = 1 << (15 - b);
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uint8_t color = 0;
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for (int p = 0; p < 4; ++p) {
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if (data[p] & mask) {
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color |= 1 << p;
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}
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}
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dst[b] = color;
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}
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dst += dst_pitch;
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}
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}
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void decode_amiga_gfx(uint8_t *dst, int dst_pitch, int w, int h, int depth, const uint8_t *src, int src_pitch, uint8_t palette_mask, uint16_t gfx_mask) {
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assert((src_pitch & 15) == 0);
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src_pitch /= 16;
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assert((w & 15) == 0);
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w /= 16;
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const int plane_size = src_pitch * 2 * h;
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for (int y = 0; y < h; ++y) {
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for (int x = 0; x < w; ++x) {
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for (int i = 0; i < 16; ++i) {
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const int mask = 1 << (15 - i);
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if (gfx_mask & mask) {
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int color = 0;
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for (int bit = 0; bit < depth; ++bit) {
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if (READ_BE_UINT16(src + bit * plane_size) & mask) {
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color |= 1 << bit;
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}
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}
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if (palette_mask == 0 && color == 0) {
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continue;
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}
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dst[x * 16 + i] = palette_mask | color;
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}
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}
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src += 2;
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}
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src += src_pitch - w;
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dst += dst_pitch;
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}
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}
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