diff options
Diffstat (limited to 'src/lib/libkogata/draw.c')
| -rw-r--r-- | src/lib/libkogata/draw.c | 104 |
1 files changed, 95 insertions, 9 deletions
diff --git a/src/lib/libkogata/draw.c b/src/lib/libkogata/draw.c index 29cae31..2db0d1d 100644 --- a/src/lib/libkogata/draw.c +++ b/src/lib/libkogata/draw.c @@ -9,6 +9,14 @@ #include <kogata/syscall.h> #include <kogata/draw.h> +// ---- + +#define STB_IMAGE_IMPLEMENTATION +#define STBI_NO_HDR +#include "stb/stb_image.h" + +// ---- + fb_t *g_fb_from_file(fd_t file, fb_info_t *geom) { fb_t *ret = (fb_t*)malloc(sizeof(fb_t)); if (ret == 0) return 0; @@ -46,6 +54,32 @@ fb_t *g_fb_from_mem(uint8_t* data, fb_info_t *geom, bool own_data) { return ret; } +fb_t *g_load_image(const char* filename) { + int w, h, n; + uint8_t *data = stbi_load(filename, &w, &h, &n, 0); + if (data == NULL) { + return NULL; + } + + fb_info_t geom; + geom.width = w; + geom.height = h; + geom.pitch = w * n; + geom.bpp = n * 8; + if (n == 1) geom.memory_model = FB_MM_GREY8; + if (n == 2) geom.memory_model = FB_MM_GA16; + if (n == 3) geom.memory_model = FB_MM_RGB24; + if (n == 4) geom.memory_model = FB_MM_RGBA32; + + fb_t *fb = g_fb_from_mem(data, &geom, true); + if (fb == NULL) { + free(data); + return NULL; + } + + return fb; +} + void g_incref_fb(fb_t *fb) { fb->nrefs++; } @@ -210,20 +244,75 @@ void g_blit(fb_t *dst, int x, int y, fb_t *src) { } void g_blit_region(fb_t *dst, int x, int y, fb_t *src, fb_region_t reg) { - if (src->geom.memory_model == dst->geom.memory_model) { - for (uint32_t i = 0; i < reg.h; i++) { + if (x < 0 || y < 0 || reg.x < 0 || reg.y < 0 || reg.w < 0 || reg.h < 0) return; // invalid argument + + if (reg.x + reg.w > src->geom.width) reg.w = src->geom.width - reg.x; + if (reg.y + reg.h > src->geom.height) reg.h = src->geom.height - reg.y; + if (reg.w <= 0 || reg.h <= 0) return; + + if (x + reg.w > dst->geom.width) reg.w = dst->geom.width - x; + if (y + reg.h > dst->geom.height) reg.h = dst->geom.height - y; + if (reg.w <= 0 || reg.h <= 0) return; + + dbg_printf("Src: 0x%p, dst: 0x%p, x: %d, y: %d, rx: %d, ry: %d, rw: %d, rh: %d\n", + src->data, dst->data, x, y, reg.x, reg.y, reg.w, reg.h); + + if (src->geom.memory_model == dst->geom.memory_model + && src->geom.memory_model != FB_MM_RGBA32 + && src->geom.memory_model != FB_MM_GA16) { + for (int i = 0; i < reg.h; i++) { memcpy( dst->data + (y + i) * dst->geom.pitch + x * (dst->geom.bpp / 8), src->data + (reg.y + i) * src->geom.pitch + reg.x * (src->geom.bpp / 8), reg.w * (src->geom.bpp / 8)); } + } else if (src->geom.memory_model == FB_MM_RGBA32 && dst->geom.memory_model == FB_MM_RGB32) { + for (int i = 0; i < reg.h; i++) { + uint8_t *dln = dst->data + (y + i) * dst->geom.pitch + x * 4; + uint8_t *sln = src->data + (reg.y + i) * src->geom.pitch + reg.x * 4; + uint32_t *dln32 = (uint32_t*) dln; + uint32_t *sln32 = (uint32_t*) sln; + for (int j = 0; j < reg.w; j++) { + uint8_t a = sln[4*j+3]; + if (a == 0xFF) { + dln32[j] = sln32[j]; + } else if (a > 0) { + uint16_t r = (0x100 - a) * (uint16_t)dln[4*j] + a * (uint16_t)sln[4*j]; + uint16_t g = (0x100 - a) * (uint16_t)dln[4*j+1] + a * (uint16_t)sln[4*j+1]; + uint16_t b = (0x100 - a) * (uint16_t)dln[4*j+2] + a * (uint16_t)sln[4*j+2]; + dln[4*j] = r >> 8; + dln[4*j+1] = g >> 8; + dln[4*j+2] = b >> 8; + } + } + } + } else if (src->geom.memory_model == FB_MM_RGBA32 && dst->geom.memory_model == FB_MM_RGB24) { + for (int i = 0; i < reg.h; i++) { + uint8_t *dln = dst->data + (y + i) * dst->geom.pitch + x * 4; + uint8_t *sln = src->data + (reg.y + i) * src->geom.pitch + reg.x * 4; + for (int j = 0; j < reg.w; j++) { + uint8_t a = sln[4*j+3]; + if (a == 0xFF) { + dln[3*j] = sln[4*j]; + dln[3*j+1] = sln[4*j+1]; + dln[3*j+2] = sln[4*j+2]; + } else if (a > 0) { + uint16_t r = (0x100 - a) * (uint16_t)dln[3*j] + a * (uint16_t)sln[4*j]; + uint16_t g = (0x100 - a) * (uint16_t)dln[3*j+1] + a * (uint16_t)sln[4*j+1]; + uint16_t b = (0x100 - a) * (uint16_t)dln[3*j+2] + a * (uint16_t)sln[4*j+2]; + dln[3*j] = r >> 8; + dln[3*j+1] = g >> 8; + dln[3*j+2] = b >> 8; + } + } + } } else { - dbg_printf("Unsupported blit between different memory models.\n"); + dbg_printf("Unsupported blit between different memory models %d and %d.\n", src->geom.memory_model, dst->geom.memory_model); } } void g_scroll_up(fb_t *dst, int l) { - for (unsigned y = 0; y < dst->geom.height - l; y++) { + for (int y = 0; y < dst->geom.height - l; y++) { memcpy(dst->data + y * dst->geom.pitch, dst->data + (y + l) * dst->geom.pitch, dst->geom.pitch); @@ -284,11 +373,8 @@ error: return 0; } -font_t *g_load_font(const char* fontname) { - char buf[128]; - - snprintf(buf, 128, "sys:/fonts/%s.bf", fontname); - fd_t f = sc_open(buf, FM_READ); +font_t *g_load_font(const char* filename) { + fd_t f = sc_open(filename, FM_READ); if (f != 0) return g_load_ascii_bitmap_font(f); return 0; |