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-rw-r--r--minui/graphics.cpp55
-rw-r--r--minui/include/minui/minui.h1
-rw-r--r--minui/resources.cpp56
3 files changed, 91 insertions, 21 deletions
diff --git a/minui/graphics.cpp b/minui/graphics.cpp
index 597f2ceaf..b24c2b114 100644
--- a/minui/graphics.cpp
+++ b/minui/graphics.cpp
@@ -36,7 +36,6 @@ static int overscan_offset_x = 0;
static int overscan_offset_y = 0;
static uint32_t gr_current = ~0;
-static constexpr uint32_t alpha_mask = 0xff000000;
// gr_draw is owned by backends.
static GRSurface* gr_draw = nullptr;
@@ -79,7 +78,7 @@ int gr_font_size(const GRFont* font, int* x, int* y) {
}
// Blends gr_current onto pix value, assumes alpha as most significant byte.
-static inline uint32_t pixel_blend(uint8_t alpha, uint32_t pix) {
+static inline uint32_t pixel_blend_argb(uint8_t alpha, uint32_t pix) {
if (alpha == 255) return gr_current;
if (alpha == 0) return pix;
uint32_t pix_r = pix & 0xff;
@@ -96,6 +95,48 @@ static inline uint32_t pixel_blend(uint8_t alpha, uint32_t pix) {
return (out_r & 0xff) | (out_g & 0xff00) | (out_b & 0xff0000) | (gr_current & 0xff000000);
}
+static inline uint32_t pixel_blend_rgba(uint8_t alpha, uint32_t pix) {
+ if (alpha == 255) return gr_current;
+ if (alpha == 0) return pix;
+ uint32_t pix_r = pix & 0xff00;
+ uint32_t pix_g = pix & 0xff0000;
+ uint32_t pix_b = pix & 0xff000000;
+ uint32_t cur_r = gr_current & 0xff00;
+ uint32_t cur_g = gr_current & 0xff0000;
+ uint32_t cur_b = gr_current & 0xff000000;
+
+ uint32_t out_r = (pix_r * (255 - alpha) + cur_r * alpha) / 255;
+ uint32_t out_g = (pix_g * (255 - alpha) + cur_g * alpha) / 255;
+ uint32_t out_b = (pix_b * (255 - alpha) + cur_b * alpha) / 255;
+
+ return (gr_current & 0xff) | (out_r & 0xff00) | (out_g & 0xff0000) | (out_b & 0xff000000);
+}
+
+static inline uint32_t pixel_blend(uint8_t alpha, uint32_t pix) {
+ if (pixel_format == PixelFormat::RGBA) {
+ return pixel_blend_rgba(alpha, pix);
+ }
+ return pixel_blend_argb(alpha, pix);
+}
+
+static inline uint32_t get_alphamask() {
+ if (pixel_format == PixelFormat::RGBA) {
+ return 0x000000ff;
+ }
+ return 0xff000000;
+}
+
+static inline uint8_t get_alpha_shift() {
+ if (pixel_format == PixelFormat::RGBA) {
+ return 0;
+ }
+ return 24;
+}
+
+static inline uint8_t get_alpha(uint32_t pix) {
+ return static_cast<uint8_t>((pix & (gr_current & get_alphamask())) >> get_alpha_shift());
+}
+
// Increments pixel pointer right, with current rotation.
static void incr_x(uint32_t** p, int row_pixels) {
if (rotation == GRRotation::LEFT) {
@@ -143,7 +184,7 @@ static uint32_t* PixelAt(GRSurface* surface, int x, int y, int row_pixels) {
static void TextBlend(const uint8_t* src_p, int src_row_bytes, uint32_t* dst_p, int dst_row_pixels,
int width, int height) {
- uint8_t alpha_current = static_cast<uint8_t>((alpha_mask & gr_current) >> 24);
+ uint8_t alpha_current = get_alpha(gr_current);
for (int j = 0; j < height; ++j) {
const uint8_t* sx = src_p;
uint32_t* px = dst_p;
@@ -158,7 +199,7 @@ static void TextBlend(const uint8_t* src_p, int src_row_bytes, uint32_t* dst_p,
}
void gr_text(const GRFont* font, int x, int y, const char* s, bool bold) {
- if (!font || !font->texture || (gr_current & alpha_mask) == 0) return;
+ if (!font || !font->texture || (gr_current & get_alphamask()) == 0) return;
if (font->texture->pixel_bytes != 1) {
printf("gr_text: font has wrong format\n");
@@ -213,6 +254,8 @@ void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a
uint32_t r32 = r, g32 = g, b32 = b, a32 = a;
if (pixel_format == PixelFormat::ARGB || pixel_format == PixelFormat::BGRA) {
gr_current = (a32 << 24) | (r32 << 16) | (g32 << 8) | b32;
+ } else if (pixel_format == PixelFormat::RGBA) {
+ gr_current = (b32 << 24) | (g32 << 16) | (r32 << 8) | a32;
} else {
gr_current = (a32 << 24) | (b32 << 16) | (g32 << 8) | r32;
}
@@ -247,7 +290,7 @@ void gr_fill(int x1, int y1, int x2, int y2) {
int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
uint32_t* p = PixelAt(gr_draw, x1, y1, row_pixels);
- uint8_t alpha = static_cast<uint8_t>(((gr_current & alpha_mask) >> 24));
+ uint8_t alpha = get_alpha(gr_current);
if (alpha > 0) {
for (int y = y1; y < y2; ++y) {
uint32_t* px = p;
@@ -369,6 +412,8 @@ int gr_init(std::initializer_list<GraphicsBackend> backends) {
pixel_format = PixelFormat::ARGB;
} else if (format == "BGRA_8888") {
pixel_format = PixelFormat::BGRA;
+ } else if (format == "RGBA_8888") {
+ pixel_format = PixelFormat::RGBA;
} else {
pixel_format = PixelFormat::UNKNOWN;
}
diff --git a/minui/include/minui/minui.h b/minui/include/minui/minui.h
index a2f62f0a6..f9be82f52 100644
--- a/minui/include/minui/minui.h
+++ b/minui/include/minui/minui.h
@@ -102,6 +102,7 @@ enum class PixelFormat : int {
RGBX = 2,
BGRA = 3,
ARGB = 4,
+ RGBA = 5, // LSB Alpha
};
enum class GraphicsBackend : int {
diff --git a/minui/resources.cpp b/minui/resources.cpp
index d7b927700..1521c8f17 100644
--- a/minui/resources.cpp
+++ b/minui/resources.cpp
@@ -153,32 +153,57 @@ static void TransformRgbToDraw(const uint8_t* input_row, uint8_t* output_row, in
int width) {
const uint8_t* ip = input_row;
uint8_t* op = output_row;
+ PixelFormat pixel_format = gr_pixel_format();
switch (channels) {
case 1:
// expand gray level to RGBX
for (int x = 0; x < width; ++x) {
- *op++ = *ip;
- *op++ = *ip;
- *op++ = *ip;
- *op++ = 0xff;
+ if (pixel_format == PixelFormat::RGBA) {
+ *op++ = 0xff;
+ *op++ = *ip;
+ *op++ = *ip;
+ *op++ = *ip;
+ } else {
+ *op++ = *ip;
+ *op++ = *ip;
+ *op++ = *ip;
+ *op++ = 0xff;
+ }
ip++;
}
break;
case 3:
- // expand RGBA to RGBX
for (int x = 0; x < width; ++x) {
- *op++ = *ip++;
- *op++ = *ip++;
- *op++ = *ip++;
- *op++ = 0xff;
+ // expand RGBA to RGBX
+ if (pixel_format == PixelFormat::RGBA) {
+ *op++ = 0xff;
+ *op++ = *ip++;
+ *op++ = *ip++;
+ *op++ = *ip++;
+ } else {
+ *op++ = *ip++;
+ *op++ = *ip++;
+ *op++ = *ip++;
+ *op++ = 0xff;
+ }
}
break;
case 4:
- // copy RGBA to RGBX
- memcpy(output_row, input_row, width * 4);
+ if (pixel_format == PixelFormat::RGBA) {
+ for (int x = 0; x < width; ++x) {
+ *op++ = *(ip + 3);
+ *op++ = *ip++;
+ *op++ = *ip++;
+ *op++ = *ip++;
+ ip++;
+ }
+ } else {
+ // copy RGBA to RGBX
+ memcpy(output_row, input_row, width * 4);
+ }
break;
}
}
@@ -201,6 +226,8 @@ int res_create_display_surface(const char* name, GRSurface** pSurface) {
PixelFormat pixel_format = gr_pixel_format();
if (pixel_format == PixelFormat::ARGB || pixel_format == PixelFormat::BGRA) {
png_set_bgr(png_ptr);
+ } else if (pixel_format == PixelFormat::RGBA) {
+ png_set_swap_alpha(png_ptr);
}
for (png_uint_32 y = 0; y < height; ++y) {
@@ -273,6 +300,8 @@ int res_create_multi_display_surface(const char* name, int* frames, int* fps,
if (gr_pixel_format() == PixelFormat::ARGB || gr_pixel_format() == PixelFormat::BGRA) {
png_set_bgr(png_ptr);
+ } else if (gr_pixel_format() == PixelFormat::RGBA) {
+ png_set_swap_alpha(png_ptr);
}
for (png_uint_32 y = 0; y < height; ++y) {
@@ -316,11 +345,6 @@ int res_create_alpha_surface(const char* name, GRSurface** pSurface) {
return -8;
}
- PixelFormat pixel_format = gr_pixel_format();
- if (pixel_format == PixelFormat::ARGB || pixel_format == PixelFormat::BGRA) {
- png_set_bgr(png_ptr);
- }
-
for (png_uint_32 y = 0; y < height; ++y) {
uint8_t* p_row = surface->data() + y * surface->row_bytes;
png_read_row(png_ptr, p_row, nullptr);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-03 10:34:14 +0100