From cb9b2c2fe7b77b0b8a3826ad2846655133683dfe Mon Sep 17 00:00:00 2001 From: 3gg <3gg@shellblade.net> Date: Thu, 29 Aug 2024 22:09:29 -0700 Subject: Fix offseting. Add function to get screen size. --- gfx-iso/src/isogfx.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) (limited to 'gfx-iso/src/isogfx.c') diff --git a/gfx-iso/src/isogfx.c b/gfx-iso/src/isogfx.c index f7d0fa9..52c4ae2 100644 --- a/gfx-iso/src/isogfx.c +++ b/gfx-iso/src/isogfx.c @@ -761,8 +761,8 @@ static Pixel alpha_blend(Pixel src, Pixel dst) { /// Draw a rectangle (tile or sprite). /// -/// The rectangle's bottom-left corner is mapped to the given origin. The -/// rectangle then extends to the right and top of the origin. +/// The rectangle's top-left corner is mapped to the screen space position given +/// by 'top_left'. /// /// The rectangle's pixels are assumed to be arranged in a linear, row-major /// fashion. @@ -775,23 +775,19 @@ static void draw_rect( const Pixel* pixels, const uint8_t* indices) { assert(iso); -#define rect_pixel(x, y) \ - (indices ? pixels[indices[py * rect_width + px]] \ - : pixels[py * rect_width + px]) +#define rect_pixel(X, Y) \ + (indices ? pixels[indices[Y * rect_width + X]] : pixels[Y * rect_width + X]) // Rect origin can be outside screen bounds, so we must offset accordingly to // draw only the visible portion. #define max(a, b) (a > b ? a : b) const int px_offset = max(0, -top_left.x); const int py_offset = max(0, -top_left.y); - // Adjust top-left to be inside bounds. - top_left.x = max(0, top_left.x); - top_left.y = max(0, top_left.y); // Rect can exceed screen bounds, so clip along Y and X as we draw. for (int py = py_offset; (py < rect_height) && (top_left.y + py < iso->screen_height); ++py) { - const int sy = top_left.y + py - py_offset; + const int sy = top_left.y + py; for (int px = px_offset; (px < rect_width) && (top_left.x + px < iso->screen_width); ++px) { const Pixel colour = rect_pixel(px, py); @@ -922,6 +918,14 @@ bool isogfx_resize(IsoGfx* iso, int screen_width, int screen_height) { return true; } +void isogfx_get_screen_size(const IsoGfx* iso, int* width, int* height) { + assert(iso); + assert(width); + assert(height); + *width = iso->screen_width; + *height = iso->screen_height; +} + const Pixel* isogfx_get_screen_buffer(const IsoGfx* iso) { assert(iso); return iso->screen; -- cgit v1.2.3