diff options
Diffstat (limited to 'trunk/libsprite.c')
| -rw-r--r-- | trunk/libsprite.c | 49 |
1 files changed, 38 insertions, 11 deletions
diff --git a/trunk/libsprite.c b/trunk/libsprite.c index 2120f94..4a7e1ac 100644 --- a/trunk/libsprite.c +++ b/trunk/libsprite.c @@ -18,17 +18,22 @@ struct sprite_header { uint32_t first_used_bit; /* old format only (spriteType = 0) */ uint32_t last_used_bit; uint32_t image_size; /* bytes */ - uint32_t mask_size; + uint32_t mask_size; /* bytes */ }; struct sprite_mask_state { uint32_t x; uint32_t y; + uint32_t max_x; + uint32_t max_y; + uint32_t offset_into_word; + uint32_t current_byte_index; + uint32_t current_word; }; static struct sprite_mode oldmodes[256]; -static uint8_t sprite_16bpp_translate[] = { +static const uint8_t sprite_16bpp_translate[] = { 0x00, 0x08, 0x10, 0x18, 0x20, 0x29, 0x31, 0x39, 0x41, 0x4a, 0x52, 0x5a, 0x62, 0x6a, 0x73, 0x7b, 0x83, 0x8b, 0x94, 0x9c, 0xa4, 0xac, 0xb4, 0xbd, @@ -39,18 +44,18 @@ static uint8_t sprite_16bpp_translate[] = { * which in turn requires sprite_load_palette(FILE* f) * defined in this file */ -static uint32_t sprite_1bpp_palette[] = { 0xffffff00, 0x0 }; +static const uint32_t sprite_1bpp_palette[] = { 0xffffff00, 0x0 }; -static uint32_t sprite_2bpp_palette[] = { 0xffffff00, 0xbbbbbb00, 0x77777700, 0x0 }; +static const uint32_t sprite_2bpp_palette[] = { 0xffffff00, 0xbbbbbb00, 0x77777700, 0x0 }; -static uint32_t sprite_4bpp_palette[] = { +static const uint32_t sprite_4bpp_palette[] = { 0xffffff00, 0xdddddd00, 0xbbbbbb00, 0x99999900, 0x77777700, 0x55555500, 0x33333300, 0x0, 0x449900, 0xeeee0000, 0xcc0000, 0xdd000000, 0xeeeebb00, 0x55880000, 0xffbb0000, 0xbbff00 }; -static uint32_t sprite_8bpp_palette[] = { +static const uint32_t sprite_8bpp_palette[] = { 0x0, 0x11111100, 0x22222200, 0x33333300, 0x44000000, 0x55111100, 0x66222200, 0x77333300, 0x4400, 0x11115500, 0x22226600, 0x33337700, @@ -117,10 +122,11 @@ static uint32_t sprite_8bpp_palette[] = { 0xcccccc00, 0xdddddd00, 0xeeeeee00, 0xffffff00 }; -void sprite_init() +void sprite_init(void) { for (uint32_t i = 0; i < 256; i++) { oldmodes[i].colorbpp = 0; + oldmodes[i].maskbpp = 1; oldmodes[i].xdpi = 0; oldmodes[i].ydpi = 0; } @@ -173,7 +179,7 @@ void sprite_init() /* old modes have the same mask bpp as their colour bpp -- PRM1-781 */ for (uint32_t i = 0; i < 256; i++) { - oldmodes[i].maskbpp = oldmodes[i].colorbpp; + oldmodes[i].mask_width = oldmodes[i].colorbpp; } } @@ -212,6 +218,7 @@ struct sprite_mode* sprite_get_mode(uint32_t spriteMode) * unless bit 31 is set (http://select.riscos.com/prm/graphics/sprites/alphachannel.html) */ mode->maskbpp = (hasEightBitAlpha ? 8 : 1); + mode->mask_width = mode->maskbpp; mode->xdpi = (spriteMode & 0x07ffc000) >> 14; /* preserve bits 14-26 only */ mode->ydpi = (spriteMode & 0x00003ffe) >> 1; /* preserve bits 1-13 only */ @@ -277,6 +284,7 @@ uint32_t sprite_palette_lookup(struct sprite* sprite, uint32_t pixel) return translated_pixel; } +/* TODO: could make static inline? */ uint32_t sprite_cmyk_to_rgb(uint32_t cmyk) { const uint8_t c = cmyk & 0xff; @@ -297,12 +305,15 @@ uint32_t sprite_cmyk_to_rgb(uint32_t cmyk) return r << 24 | g << 16 | b << 8; } +/* TODO: could make static inline? */ uint32_t sprite_upscale_color(uint32_t pixel, struct sprite_mode* mode) { switch (mode->colorbpp) { case 32: if (mode->color_model == SPRITE_RGB) { /* swap from 0xAABBGGRR to 0xRRGGBBAA */ + /*uint8_t alpha = pixel & (0xff << 24); + TODO: think about mask/alpha */ return BSWAP(pixel); } else { return sprite_cmyk_to_rgb(pixel); @@ -337,13 +348,30 @@ uint32_t sprite_upscale_color(uint32_t pixel, struct sprite_mode* mode) } } +struct sprite_mask_state* sprite_init_mask_state(struct sprite* sprite, struct sprite_header* header, uint8_t* mask) +{ + struct sprite_mask_state* mask_state = malloc(sizeof(struct sprite_mask_state)); + + mask_state->x = header->first_used_bit; + mask_state->y = 0; + mask_state->max_x = header->width_words * 32 - (31 - header->last_used_bit) - 1; + mask_state->max_y = sprite->height - 1; + mask_state->offset_into_word = mask_state->x % 32; + mask_state->current_byte_index = 0; + mask_state->current_word = BTUINT((mask + mask_state->current_byte_index)); + + return mask_state; +} + /* Get the next mask byte. * Mask of 0xff denotes 100% opaque, 0x00 denotes 100% transparent */ -uint8_t sprite_get_mask(struct sprite* sprite, struct sprite_header* header, struct sprite_mask_state* mask_state) +uint8_t sprite_next_mask_pixel(struct sprite* sprite, struct sprite_header* header, struct sprite_mask_state* mask_state) { /* a 1bpp mask (for new mode sprites), each row is word aligned (therefore potential righthand wastage */ sprite = sprite; header = header; mask_state = mask_state; + + return 0xff; } @@ -384,8 +412,7 @@ void sprite_load_high_color(uint8_t* image_in, uint8_t* mask, struct sprite* spr void sprite_load_low_color(uint8_t* image_in, uint8_t* mask, struct sprite* sprite, struct sprite_header* header) { - mask = mask; /* TODO: mask */ - + mask = mask; sprite->image = malloc(sprite->width * sprite->height * 4); /* all image data is 32bpp going out */ const uint32_t bpp = sprite->mode->colorbpp; |