1

/* $Id$ */

     2

     3

/** @file 8bpp_optimized.cpp */

     4

     5

#include "../stdafx.h"

     6

#include "../zoom.hpp"

     7

#include "../gfx.h"

     8

#include "../debug.h"

     9

#include "8bpp_optimized.hpp"

    10

    11

static FBlitter_8bppOptimized iFBlitter_8bppOptimized;

    12

    13

void Blitter_8bppOptimized::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)

    14

{

    15

	const uint8 *src, *src_next;

    16

	uint8 *dst, *dst_line;

    17

	uint offset = 0;

    18

    19

	/* Find the offset of this zoom-level */

    20

	offset = ((const uint8 *)bp->sprite)[(int)zoom * 2] | ((const byte *)bp->sprite)[(int)zoom * 2 + 1] << 8;

    21

    22

	/* Find where to start reading in the source sprite */

    23

	src = (const uint8 *)bp->sprite + offset;

    24

	dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left;

    25

    26

	/* Skip over the top lines in the source image */

    27

	for (int y = 0; y < bp->skip_top; y++) {

    28

		uint trans, pixels;

    29

		for (;;) {

    30

			trans = *src++;

    31

			pixels = *src++;

    32

			if (trans == 0 && pixels == 0) break;

    33

			src += pixels;

    34

		}

    35

	}

    36

    37

	src_next = src;

    38

    39

	for (int y = 0; y < bp->height; y++) {

    40

		dst = dst_line;

    41

		dst_line += bp->pitch;

    42

    43

		uint skip_left = bp->skip_left;

    44

		int width = bp->width;

    45

    46

		for (;;) {

    47

			src = src_next;

    48

			uint8 trans = *src++;

    49

			uint8 pixels = *src++;

    50

			src_next = src + pixels;

    51

			if (trans == 0 && pixels == 0) break;

    52

			if (width <= 0) continue;

    53

    54

			if (skip_left != 0) {

    55

				if (skip_left < trans) {

    56

					trans -= skip_left;

    57

					skip_left = 0;

    58

				} else {

    59

					skip_left -= trans;

    60

					trans = 0;

    61

				}

    62

				if (skip_left < pixels) {

    63

					src += skip_left;

    64

					pixels -= skip_left;

    65

					skip_left = 0;

    66

				} else {

    67

					src += pixels;

    68

					skip_left -= pixels;

    69

					pixels = 0;

    70

				}

    71

			}

    72

			if (skip_left != 0) continue;

    73

    74

			/* Skip transparent pixels */

    75

			dst += trans;

    76

			width -= trans;

    77

			if (width <= 0) continue;

    78

			if (pixels > width) pixels = width;

    79

			width -= pixels;

    80

    81

			switch (mode) {

    82

				case BM_COLOUR_REMAP:

    83

					for (uint x = 0; x < pixels; x++) {

    84

						if (bp->remap[*src] != 0) *dst = bp->remap[*src];

    85

						dst++; src++;

    86

					}

    87

					break;

    88

    89

				case BM_TRANSPARENT:

    90

					for (uint x = 0; x < pixels; x++) {

    91

						*dst = bp->remap[*dst];

    92

						dst++; src++;

    93

					}

    94

					break;

    95

    96

				default:

    97

					memcpy(dst, src, pixels);

    98

					dst += pixels; src += pixels;

    99

					break;

   100

			}

   101

		}

   102

	}

   103

}

   104

   105

Sprite *Blitter_8bppOptimized::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)

   106

{

   107

	Sprite *dest_sprite;

   108

	byte *temp_dst;

   109

	uint memory = 0;

   110

	uint index = 0;

   111

   112

	/* Make memory for all zoom-levels */

   113

	memory += (int)ZOOM_LVL_END * sizeof(uint16);

   114

	for (int i = 0; i < (int)ZOOM_LVL_END; i++) {

   115

		memory += UnScaleByZoom(sprite->height, (ZoomLevel)i) * UnScaleByZoom(sprite->width, (ZoomLevel)i);

   116

		index += 2;

   117

	}

   118

   119

	/* We have no idea how much memory we really need, so just guess something */

   120

	memory *= 5;

   121

	temp_dst = MallocT<byte>(memory);

   122

   123

	/* Make the sprites per zoom-level */

   124

	for (int i = 0; i < (int)ZOOM_LVL_END; i++) {

   125

		/* Store the scaled image */

   126

		const SpriteLoader::CommonPixel *src;

   127

   128

		/* Store the index table */

   129

		temp_dst[i * 2] = index & 0xFF;

   130

		temp_dst[i * 2 + 1] = (index >> 8) & 0xFF;

   131

   132

		byte *dst = &temp_dst[index];

   133

   134

		for (int y = 0; y < UnScaleByZoom(sprite->height, (ZoomLevel)i); y++) {

   135

			uint trans = 0;

   136

			uint pixels = 0;

   137

			uint last_color = 0;

   138

			uint count_index = 0;

   139

			uint rx = 0;

   140

			src = &sprite->data[ScaleByZoom(y, (ZoomLevel)i) * sprite->width];

   141

   142

			for (int x = 0; x < UnScaleByZoom(sprite->width, (ZoomLevel)i); x++) {

   143

				uint color = 0;

   144

   145

				/* Get the color keeping in mind the zoom-level */

   146

				for (int j = 0; j < ScaleByZoom(1, (ZoomLevel)i); j++) {

   147

					if (src->m != 0) color = src->m;

   148

					src++;

   149

					rx++;

   150

					/* Because of the scaling it might happen we read outside the buffer. Avoid that. */

   151

					if (rx == sprite->width) break;

   152

				}

   153

   154

				if (last_color == 0 || color == 0 || pixels == 255) {

   155

					if (count_index != 0) {

   156

						/* Write how many non-transparent bytes we get */

   157

						temp_dst[count_index] = pixels;

   158

						pixels = 0;

   159

						count_index = 0;

   160

					}

   161

					/* As long as we find transparency bytes, keep counting */

   162

					if (color == 0) {

   163

						last_color = 0;

   164

						trans++;

   165

						continue;

   166

					}

   167

					/* No longer transparency, so write the amount of transparent bytes */

   168

					*dst = trans;

   169

					dst++; index++;

   170

					trans = 0;

   171

					/* Reserve a byte for the pixel counter */

   172

					count_index = index;

   173

					dst++; index++;

   174

				}

   175

				last_color = color;

   176

				pixels++;

   177

				*dst = color;

   178

				dst++; index++;

   179

			}

   180

   181

			if (count_index != 0) temp_dst[count_index] = pixels;

   182

   183

			/* Write line-ending */

   184

			*dst = 0; dst++; index++;

   185

			*dst = 0; dst++; index++;

   186

		}

   187

	}

   188

   189

	/* Safety check, to make sure we guessed the size correctly */

   190

	assert(index < memory);

   191

   192

	/* Allocate the exact amount of memory we need */

   193

	dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + index);

   194

   195

	dest_sprite->height = sprite->height;

   196

	dest_sprite->width  = sprite->width;

   197

	dest_sprite->x_offs = sprite->x_offs;

   198

	dest_sprite->y_offs = sprite->y_offs;

   199

	memcpy(dest_sprite->data, temp_dst, index);

   200

	free(temp_dst);

   201

   202

	return dest_sprite;

   203

}