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-rw-r--r--plugingui/pixelbuffer.cc248
1 files changed, 184 insertions, 64 deletions
diff --git a/plugingui/pixelbuffer.cc b/plugingui/pixelbuffer.cc
index 360ad06..1df1d5a 100644
--- a/plugingui/pixelbuffer.cc
+++ b/plugingui/pixelbuffer.cc
@@ -29,6 +29,7 @@
#include <cassert>
#include <cstdlib>
+#include <cstring>
namespace GUI
{
@@ -47,43 +48,63 @@ PixelBuffer::~PixelBuffer()
void PixelBuffer::realloc(std::size_t width, std::size_t height)
{
free(buf);
- buf = (unsigned char *)calloc(width * height, 3);
+ buf = (std::uint8_t *)calloc(width * height, 3);
this->width = width;
this->height = height;
}
#define PX(k) ((x + y * width) * 3 + k)
-void PixelBuffer::setPixel(std::size_t x, std::size_t y,
- unsigned char red,
- unsigned char green,
- unsigned char blue,
- unsigned char alpha)
+void PixelBuffer::setPixel(std::size_t x, std::size_t y, const Colour& c)
{
- assert(x < width);
- assert(y < height);
-
- if(alpha == 0)
+ if(c.alpha() == 0)
{
return;
}
- if(alpha < 255)
+ if(c.alpha() < 255)
{
- unsigned int a = alpha;
- unsigned int b = 255 - alpha;
+ unsigned int a = c.alpha();
+ unsigned int b = 255 - a;
- buf[PX(0)] = (unsigned char)(((int)red * a + (int)buf[PX(0)] * b) / 255);
- buf[PX(1)] = (unsigned char)(((int)green * a + (int)buf[PX(1)] * b) / 255);
- buf[PX(2)] = (unsigned char)(((int)blue * a + (int)buf[PX(2)] * b) / 255);
+ std::uint8_t* pixel = &buf[PX(0)];
+ *pixel = (std::uint8_t)(((int)c.red() * a + (int)*pixel * b) / 255);
+ ++pixel;
+ *pixel = (std::uint8_t)(((int)c.green() * a + (int)*pixel * b) / 255);
+ ++pixel;
+ *pixel = (std::uint8_t)(((int)c.blue() * a + (int)*pixel * b) / 255);
}
else
{
- buf[PX(0)] = red;
- buf[PX(1)] = green;
- buf[PX(2)] = blue;
+ memcpy(&buf[PX(0)], c.data(), 3);
+ }
+}
+
+void PixelBuffer::writeLine(std::size_t x, std::size_t y,
+ const std::uint8_t* line, std::size_t len)
+{
+ std::uint8_t* target = &buf[PX(0)];
+ while(len)
+ {
+ if(line[3] == 0xff)
+ {
+ memcpy(target, line, 3);
+ }
+ else
+ {
+ unsigned int a = line[3];
+ unsigned int b = 255 - a;
+
+ target[0] = (std::uint8_t)(((int)line[0] * a + (int)target[0] * b) / 255);
+ target[1] = (std::uint8_t)(((int)line[1] * a + (int)target[1] * b) / 255);
+ target[2] = (std::uint8_t)(((int)line[2] * a + (int)target[2] * b) / 255);
+ }
+ target += 3;
+ line += 4;
+ --len;
}
}
+
PixelBufferAlpha::PixelBufferAlpha(std::size_t width, std::size_t height)
: managed(true)
, buf(nullptr)
@@ -104,30 +125,110 @@ PixelBufferAlpha::~PixelBufferAlpha()
void PixelBufferAlpha::realloc(std::size_t width, std::size_t height)
{
free(buf);
- buf = (unsigned char *)calloc(width * height, 4);
+ buf = (std::uint8_t *)calloc(width * height, 4);
this->width = width;
this->height = height;
}
+void PixelBufferAlpha::clear()
+{
+ memset(buf, 0, width * height * 4);
+}
+
#undef PX
#define PX(k) ((x + y * width) * 4 + k)
-void PixelBufferAlpha::setPixel(std::size_t x, std::size_t y,
- unsigned char red,
- unsigned char green,
- unsigned char blue,
- unsigned char alpha)
+//void PixelBufferAlpha::setPixel(std::size_t x, std::size_t y,
+// std::uint8_t red,
+// std::uint8_t green,
+// std::uint8_t blue,
+// std::uint8_t alpha)
+//{
+// //assert(x < width);
+// //assert(y < height);
+//
+// std::uint8_t* pixel = &buf[PX(0)];
+// *pixel = red;
+// ++pixel;
+// *pixel = green;
+// ++pixel;
+// *pixel = blue;
+// ++pixel;
+// *pixel = alpha;
+//}
+
+void PixelBufferAlpha::setPixel(std::size_t x, std::size_t y, const Colour& c)
{
- assert(x < width);
- assert(y < height);
+ std::uint8_t* pixel = &buf[PX(0)];
+ *pixel = c.red();
+ ++pixel;
+ *pixel = c.green();
+ ++pixel;
+ *pixel = c.blue();
+ ++pixel;
+ *pixel = c.alpha();
+}
- buf[PX(0)] = red;
- buf[PX(1)] = green;
- buf[PX(2)] = blue;
- buf[PX(3)] = alpha;
+void PixelBufferAlpha::writeLine(std::size_t x, std::size_t y,
+ const std::uint8_t* line, std::size_t len)
+{
+ auto offset = &buf[PX(0)];
+ if(x + y * width + len > width * height)
+ {
+ return; // out of bounds
+ }
+ std::memcpy(offset, line, len * 4);
}
+// SIMD: https://github.com/WojciechMula/toys/blob/master/blend_32bpp/blend_32bpp.c
+
+void PixelBufferAlpha::blendLine(std::size_t x, std::size_t y,
+ const std::uint8_t* line, std::size_t len)
+{
+ auto offset = &buf[PX(0)];
+ if(x + y * width + len > width * height)
+ {
+ return; // out of bounds
+ }
+
+ std::uint32_t* foreground = (std::uint32_t*)line;
+ std::uint32_t* background = (std::uint32_t*)offset;
+ for(std::size_t x = 0; x < len; ++x)
+ {
+ auto Rf = *foreground & 0xff;
+ auto Gf = (*foreground >> 8) & 0xff;
+ auto Bf = (*foreground >> 16) & 0xff;
+ auto Af = (*foreground >> 24) & 0xff;
+
+ auto Rb = *background & 0xff;
+ auto Gb = (*background >> 8) & 0xff;
+ auto Bb = (*background >> 16) & 0xff;
+ auto Ab = (*background >> 24) & 0xff;
+
+ auto R = (Rf * Af)/256 + Rb;
+ auto G = (Gf * Af)/256 + Gb;
+ auto B = (Bf * Af)/256 + Bb;
+
+ if (R > 255) R = 255;
+ if (G > 255) G = 255;
+ if (B > 255) B = 255;
+
+// auto a = Ab / 255.0;
+// auto b = Af / 255.0;
+// b *= (1 - a);
+
+// (Af / 255.0 * (1 - Ab / 255.0)) * 255
+ auto b = Ab * (255 - Af);
+
+ *background = R | (G << 8) | (B << 16) | b << 24;
+
+ ++foreground;
+ ++background;
+ }
+}
+
+
// http://en.wikipedia.org/wiki/Alpha_compositing
-static inline void getAlpha(unsigned char _a, unsigned char _b,
+static inline void getAlpha(std::uint8_t _a, std::uint8_t _b,
float &a, float &b)
{
a = _a / 255.0;
@@ -136,61 +237,80 @@ static inline void getAlpha(unsigned char _a, unsigned char _b,
}
void PixelBufferAlpha::addPixel(std::size_t x, std::size_t y,
- unsigned char red,
- unsigned char green,
- unsigned char blue,
- unsigned char alpha)
+ std::uint8_t red,
+ std::uint8_t green,
+ std::uint8_t blue,
+ std::uint8_t alpha)
{
- assert(x < width);
- assert(y < height);
+ //assert(x < width);
+ //assert(y < height);
if(alpha == 0)
{
return;
}
+ std::uint8_t* pixel = &buf[PX(0)];
+
if(alpha < 255)
{
float a, b;
getAlpha(alpha, buf[PX(3)], a, b);
- buf[PX(0)] = (unsigned char)((float)red * a + (float)buf[PX(0)] * b);
- buf[PX(0)] /= (a + b);
- buf[PX(1)] = (unsigned char)((float)green * a + (float)buf[PX(1)] * b);
- buf[PX(1)] /= (a + b);
- buf[PX(2)] = (unsigned char)((float)blue * a + (float)buf[PX(2)] * b);
- buf[PX(2)] /= (a + b);
-
- buf[PX(3)] = (a + b) * 255;
+ *pixel = (std::uint8_t)((red * a + *pixel * b) / (a + b));
+ ++pixel;
+ *pixel = (std::uint8_t)((green * a + *pixel * b) / (a + b));
+ ++pixel;
+ *pixel = (std::uint8_t)((blue * a + *pixel * b) / (a + b));
+ ++pixel;
+ *pixel = (a + b) * 255;
}
else
{
- buf[PX(0)] = red;
- buf[PX(1)] = green;
- buf[PX(2)] = blue;
- buf[PX(3)] = alpha;
+ *pixel = red;
+ ++pixel;
+ *pixel = green;
+ ++pixel;
+ *pixel = blue;
+ ++pixel;
+ *pixel = alpha;
}
}
void PixelBufferAlpha::addPixel(std::size_t x, std::size_t y, const Colour& c)
{
- addPixel(x, y,
- c.red() * 255, c.green() * 255, c.blue() * 255, c.alpha() * 255);
+ addPixel(x, y, c.red(), c.green(), c.blue(), c.alpha());
}
void PixelBufferAlpha::pixel(std::size_t x, std::size_t y,
- unsigned char* red,
- unsigned char* green,
- unsigned char* blue,
- unsigned char* alpha) const
-{
- assert(x < width);
- assert(y < height);
-
- *red = buf[PX(0)];
- *green = buf[PX(1)];
- *blue = buf[PX(2)];
- *alpha = buf[PX(3)];
+ std::uint8_t* red,
+ std::uint8_t* green,
+ std::uint8_t* blue,
+ std::uint8_t* alpha) const
+{
+ //assert(x < width);
+ //assert(y < height);
+
+ std::uint8_t* pixel = &buf[PX(0)];
+ *red = *pixel;
+ ++pixel;
+ *green = *pixel;
+ ++pixel;
+ *blue = *pixel;
+ ++pixel;
+ *alpha = *pixel;
+}
+
+const Colour& PixelBufferAlpha::pixel(std::size_t x, std::size_t y) const
+{
+ static Colour c;
+ c = Colour(buf[PX(0)], buf[PX(1)], buf[PX(2)], buf[PX(3)]);
+ return c;
+}
+
+const std::uint8_t* PixelBufferAlpha::getLine(std::size_t x, std::size_t y) const
+{
+ return &buf[PX(0)];
}
} // GUI::
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 23:50:06 +0000